chore: migrate from exit/err channels to context (#900)

* chore: migrate from exit/err channels to context

Signed-off-by: Evan Baker <rbtr@users.noreply.github.com>

* pass context instead of storing

* rename controller packages

* comment init

build/tools/go.sum

@@ -1,5 +1,6 @@
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@@ -248,6 +339,7 @@ github.com/go-toolsmith/astequal v1.0.0 h1:4zxD8j3JRFNyLN46lodQuqz3xdKSrur7U/sr0
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@@ -271,11 +363,13 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
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@@ -283,6 +377,7 @@ github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFU
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@@ -321,8 +416,10 @@ github.com/golangci/revgrep v0.0.0-20210208091834-cd28932614b5/go.mod h1:LK+zW4M
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@@ -336,6 +433,7 @@ github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -343,28 +441,39 @@ github.com/google/pprof v0.0.0-20191218002539-d4f498aebedc/go.mod h1:ZgVRPoUq/hf
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@@ -804,6 +1027,7 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20200220183623-bac4c82f6975/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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 golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
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@@ -815,8 +1039,10 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
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@@ -827,8 +1053,10 @@ golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -891,6 +1119,7 @@ golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAG
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@@ -902,6 +1131,7 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -963,6 +1193,7 @@ golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -976,6 +1207,7 @@ golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxb
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@@ -1087,6 +1319,7 @@ google.golang.org/api v0.20.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/
 google.golang.org/api v0.22.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
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 google.golang.org/api v0.28.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0MncE=
+google.golang.org/api v0.29.0 h1:BaiDisFir8O4IJxvAabCGGkQ6yCJegNQqSVoYUNAnbk=
 google.golang.org/api v0.29.0/go.mod h1:Lcubydp8VUV7KeIHD9z2Bys/sm/vGKnG1UHuDBSrHWM=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@@ -1094,6 +1327,7 @@ google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7
 google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/appengine v1.6.2/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
+google.golang.org/appengine v1.6.6 h1:lMO5rYAqUxkmaj76jAkRUvt5JZgFymx/+Q5Mzfivuhc=
 google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/genproto v0.0.0-20170818010345-ee236bd376b0/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
@@ -1125,6 +1359,7 @@ google.golang.org/genproto v0.0.0-20200511104702-f5ebc3bea380/go.mod h1:55QSHmfG
 google.golang.org/genproto v0.0.0-20200515170657-fc4c6c6a6587/go.mod h1:YsZOwe1myG/8QRHRsmBRE1LrgQY60beZKjly0O1fX9U=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/genproto v0.0.0-20200626011028-ee7919e894b5/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
+google.golang.org/genproto v0.0.0-20200707001353-8e8330bf89df h1:HWF6nM8ruGdu1K8IXFR+i2oT3YP+iBfZzCbC9zUfcWo=
 google.golang.org/genproto v0.0.0-20200707001353-8e8330bf89df/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/grpc v1.8.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
@@ -1139,6 +1374,7 @@ google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8
 google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
 google.golang.org/grpc v1.29.0/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
+google.golang.org/grpc v1.29.1 h1:EC2SB8S04d2r73uptxphDSUG+kTKVgjRPF+N3xpxRB4=
 google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
@@ -1151,6 +1387,7 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -1158,19 +1395,27 @@ gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/cheggaaa/pb.v1 v1.0.28 h1:n1tBJnnK2r7g9OW2btFH91V92STTUevLXYFb8gy9EMk=
 gopkg.in/cheggaaa/pb.v1 v1.0.28/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/errgo.v2 v2.1.0 h1:0vLT13EuvQ0hNvakwLuFZ/jYrLp5F3kcWHXdRggjCE8=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gcfg.v1 v1.2.3 h1:m8OOJ4ccYHnx2f4gQwpno8nAX5OGOh7RLaaz0pj3Ogs=
 gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
 gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/natefinch/lumberjack.v2 v2.0.0 h1:1Lc07Kr7qY4U2YPouBjpCLxpiyxIVoxqXgkXLknAOE8=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
+gopkg.in/resty.v1 v1.12.0 h1:CuXP0Pjfw9rOuY6EP+UvtNvt5DSqHpIxILZKT/quCZI=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/square/go-jose.v2 v2.2.2 h1:orlkJ3myw8CN1nVQHBFfloD+L3egixIa4FvUP6RosSA=
 gopkg.in/square/go-jose.v2 v2.2.2/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
 gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -1186,6 +1431,7 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20190905181640-827449938966/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -1202,16 +1448,22 @@ k8s.io/apiextensions-apiserver v0.18.2 h1:I4v3/jAuQC+89L3Z7dDgAiN4EOjN6sbm6iBqQw
 k8s.io/apiextensions-apiserver v0.18.2/go.mod h1:q3faSnRGmYimiocj6cHQ1I3WpLqmDgJFlKL37fC4ZvY=
 k8s.io/apimachinery v0.18.2 h1:44CmtbmkzVDAhCpRVSiP2R5PPrC2RtlIv/MoB8xpdRA=
 k8s.io/apimachinery v0.18.2/go.mod h1:9SnR/e11v5IbyPCGbvJViimtJ0SwHG4nfZFjU77ftcA=
+k8s.io/apiserver v0.18.2 h1:fwKxdTWwwYhxvtjo0UUfX+/fsitsNtfErPNegH2x9ic=
 k8s.io/apiserver v0.18.2/go.mod h1:Xbh066NqrZO8cbsoenCwyDJ1OSi8Ag8I2lezeHxzwzw=
+k8s.io/client-go v0.18.2 h1:aLB0iaD4nmwh7arT2wIn+lMnAq7OswjaejkQ8p9bBYE=
 k8s.io/client-go v0.18.2/go.mod h1:Xcm5wVGXX9HAA2JJ2sSBUn3tCJ+4SVlCbl2MNNv+CIU=
+k8s.io/code-generator v0.18.2 h1:C1Nn2JiMf244CvBDKVPX0W2mZFJkVBg54T8OV7/Imso=
 k8s.io/code-generator v0.18.2/go.mod h1:+UHX5rSbxmR8kzS+FAv7um6dtYrZokQvjHpDSYRVkTc=
+k8s.io/component-base v0.18.2 h1:SJweNZAGcUvsypLGNPNGeJ9UgPZQ6+bW+gEHe8uyh/Y=
 k8s.io/component-base v0.18.2/go.mod h1:kqLlMuhJNHQ9lz8Z7V5bxUUtjFZnrypArGl58gmDfUM=
 k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
+k8s.io/gengo v0.0.0-20200114144118-36b2048a9120 h1:RPscN6KhmG54S33L+lr3GS+oD1jmchIU0ll519K6FA4=
 k8s.io/gengo v0.0.0-20200114144118-36b2048a9120/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
 k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
 k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
+k8s.io/kube-openapi v0.0.0-20200121204235-bf4fb3bd569c h1:/KUFqjjqAcY4Us6luF5RDNZ16KJtb49HfR3ZHB9qYXM=
 k8s.io/kube-openapi v0.0.0-20200121204235-bf4fb3bd569c/go.mod h1:GRQhZsXIAJ1xR0C9bd8UpWHZ5plfAS9fzPjJuQ6JL3E=
 k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89 h1:d4vVOjXm687F1iLSP2q3lyPPuyvTUt3aVoBpi2DqRsU=
 k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
@@ -1223,9 +1475,13 @@ mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b h1:DxJ5nJdkhDlLok9K6qO+5290kphD
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
 mvdan.cc/unparam v0.0.0-20210104141923-aac4ce9116a7 h1:HT3e4Krq+IE44tiN36RvVEb6tvqeIdtsVSsxmNPqlFU=
 mvdan.cc/unparam v0.0.0-20210104141923-aac4ce9116a7/go.mod h1:hBpJkZE8H/sb+VRFvw2+rBpHNsTBcvSpk61hr8mzXZE=
+rsc.io/binaryregexp v0.2.0 h1:HfqmD5MEmC0zvwBuF187nq9mdnXjXsSivRiXN7SmRkE=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.7 h1:uuHDyjllyzRyCIvvn0OBjiRB0SgBZGqHNYAmjR7fO50=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.7/go.mod h1:PHgbrJT7lCHcxMU+mDHEm+nx46H4zuuHZkDP6icnhu0=
 sigs.k8s.io/controller-tools v0.3.0 h1:y3YD99XOyWaXkiF1kd41uRvfp/64teWcrEZFuHxPhJ4=
 sigs.k8s.io/controller-tools v0.3.0/go.mod h1:enhtKGfxZD1GFEoMgP8Fdbu+uKQ/cq1/WGJhdVChfvI=

cns/api.go

@@ -36,7 +36,7 @@ const (
 // HTTPService describes the min API interface that every service should have.
 type HTTPService interface {
 	common.ServiceAPI
-	SendNCSnapShotPeriodically(int, chan bool)
+	SendNCSnapShotPeriodically(context.Context, int)
 	SetNodeOrchestrator(*SetOrchestratorTypeRequest)
 	SyncNodeStatus(string, string, string, json.RawMessage) (int, string)
 	GetPendingProgramIPConfigs() []IPConfigurationStatus

cns/common/service.go

@@ -5,10 +5,10 @@ package common
 
 import (
 	"errors"
-	"github.com/Azure/azure-container-networking/server/tls"
 
 	"github.com/Azure/azure-container-networking/cns/logger"
 	acn "github.com/Azure/azure-container-networking/common"
+	"github.com/Azure/azure-container-networking/server/tls"
 	"github.com/Azure/azure-container-networking/store"
 )
 
@@ -17,7 +17,7 @@ type Service struct {
 	Name        string
 	Version     string
 	Options     map[string]interface{}
-	ErrChan     chan error
+	ErrChan     chan<- error
 	Store       store.KeyValueStore
 	ChannelMode string
 }
@@ -36,7 +36,7 @@ type ServiceConfig struct {
 	Name        string
 	Version     string
 	Listener    *acn.Listener
-	ErrChan     chan error
+	ErrChan     chan<- error
 	Store       store.KeyValueStore
 	ChannelMode string
 	TlsSettings tls.TlsSettings

cns/fakes/cnsfake.go

@@ -96,8 +96,6 @@ func (ipm *IPStateManager) AddIPConfigs(ipconfigs []cns.IPConfigurationStatus) {
 			ipm.PendingReleaseIPConfigState[ipconfigs[i].ID] = ipconfigs[i]
 		}
 	}
-
-	return
 }
 
 func (ipm *IPStateManager) RemovePendingReleaseIPConfigs(ipconfigNames []string) {
@@ -107,8 +105,6 @@ func (ipm *IPStateManager) RemovePendingReleaseIPConfigs(ipconfigNames []string)
 	for i := 0; i < len(ipconfigNames); i++ {
 		delete(ipm.PendingReleaseIPConfigState, ipconfigNames[i])
 	}
-
-	return
 }
 
 func (ipm *IPStateManager) ReserveIPConfig() (cns.IPConfigurationStatus, error) {
@@ -176,6 +172,8 @@ func (ipm *IPStateManager) MarkIPAsPendingRelease(numberOfIPsToMark int) (map[st
 	return pendingRelease, nil
 }
 
+var _ cns.HTTPService = (*HTTPServiceFake)(nil)
+
 type HTTPServiceFake struct {
 	IPStateManager IPStateManager
 	PoolMonitor    cns.IPAMPoolMonitor
@@ -220,22 +218,16 @@ func (fake *HTTPServiceFake) SetNumberOfAllocatedIPs(desiredAllocatedIPCount int
 	return nil
 }
 
-func (fake *HTTPServiceFake) SendNCSnapShotPeriodically(int, chan bool) {
+func (fake *HTTPServiceFake) SendNCSnapShotPeriodically(context.Context, int) {}
 
-}
-
-func (fake *HTTPServiceFake) SetNodeOrchestrator(*cns.SetOrchestratorTypeRequest) {
-
-}
+func (fake *HTTPServiceFake) SetNodeOrchestrator(*cns.SetOrchestratorTypeRequest) {}
 
 func (fake *HTTPServiceFake) SyncNodeStatus(string, string, string, json.RawMessage) (int, string) {
 	return 0, ""
 }
 
 // SyncHostNCVersion will update HostVersion in containerstatus.
-func (fake *HTTPServiceFake) SyncHostNCVersion(context.Context, string, time.Duration) {
-	return
-}
+func (fake *HTTPServiceFake) SyncHostNCVersion(context.Context, string, time.Duration) {}
 
 func (fake *HTTPServiceFake) GetPendingProgramIPConfigs() []cns.IPConfigurationStatus {
 	ipconfigs := []cns.IPConfigurationStatus{}

cns/fakes/requestcontrollerfake.go

@@ -5,10 +5,13 @@ import (
 	"net"
 
 	"github.com/Azure/azure-container-networking/cns"
+	"github.com/Azure/azure-container-networking/cns/singletenantcontroller"
 	nnc "github.com/Azure/azure-container-networking/nodenetworkconfig/api/v1alpha"
 	"github.com/google/uuid"
 )
 
+var _ singletenantcontroller.RequestController = (*RequestControllerFake)(nil)
+
 type RequestControllerFake struct {
 	fakecns   *HTTPServiceFake
 	cachedCRD nnc.NodeNetworkConfig
@@ -22,9 +25,11 @@ func NewRequestControllerFake(cnsService *HTTPServiceFake, scalar nnc.Scaler, su
 			Spec: nnc.NodeNetworkConfigSpec{},
 			Status: nnc.NodeNetworkConfigStatus{
 				Scaler: scalar,
-				NetworkContainers: []nnc.NetworkContainer{nnc.NetworkContainer{
+				NetworkContainers: []nnc.NetworkContainer{
+					{
 						SubnetAddressSpace: subnetAddressSpace,
-				}},
+					},
+				},
 			},
 		},
 	}
@@ -62,11 +67,11 @@ func (rc *RequestControllerFake) CarveIPConfigsAndAddToStatusAndCNS(numberOfIPCo
 	return cnsIPConfigs
 }
 
-func (rc *RequestControllerFake) InitRequestController() error {
+func (rc *RequestControllerFake) Init(context.Context) error {
 	return nil
 }
 
-func (rc *RequestControllerFake) StartRequestController(exitChan <-chan struct{}) error {
+func (rc *RequestControllerFake) Start(context.Context) error {
 	return nil
 }
 
@@ -74,9 +79,8 @@ func (rc *RequestControllerFake) IsStarted() bool {
 	return true
 }
 
-func (rc *RequestControllerFake) UpdateCRDSpec(cntxt context.Context, desiredSpec nnc.NodeNetworkConfigSpec) error {
+func (rc *RequestControllerFake) UpdateCRDSpec(_ context.Context, desiredSpec nnc.NodeNetworkConfigSpec) error {
 	rc.cachedCRD.Spec = desiredSpec
-
 	return nil
 }
 

cns/ipampoolmonitor/ipampoolmonitor.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/Azure/azure-container-networking/cns"
 	"github.com/Azure/azure-container-networking/cns/logger"
-	"github.com/Azure/azure-container-networking/cns/requestcontroller"
+	"github.com/Azure/azure-container-networking/cns/singletenantcontroller"
 	nnc "github.com/Azure/azure-container-networking/nodenetworkconfig/api/v1alpha"
 )
 
@@ -17,21 +17,18 @@ const (
 )
 
 type CNSIPAMPoolMonitor struct {
-	pendingRelease bool
-
-	cachedNNC                nnc.NodeNetworkConfig
-	updatingIpsNotInUseCount int
-	scalarUnits              nnc.Scaler
-
-	httpService    cns.HTTPService
-	rc             requestcontroller.RequestController
-	MinimumFreeIps int64
 	MaximumFreeIps           int64
-
+	MinimumFreeIps           int64
+	cachedNNC                nnc.NodeNetworkConfig
+	httpService              cns.HTTPService
 	mu                       sync.RWMutex
+	pendingRelease           bool
+	rc                       singletenantcontroller.RequestController
+	scalarUnits              nnc.Scaler
+	updatingIpsNotInUseCount int
 }
 
-func NewCNSIPAMPoolMonitor(httpService cns.HTTPService, rc requestcontroller.RequestController) *CNSIPAMPoolMonitor {
+func NewCNSIPAMPoolMonitor(httpService cns.HTTPService, rc singletenantcontroller.RequestController) *CNSIPAMPoolMonitor {
 	logger.Printf("NewCNSIPAMPoolMonitor: Create IPAM Pool Monitor")
 	return &CNSIPAMPoolMonitor{
 		pendingRelease: false,
@@ -40,16 +37,6 @@ func NewCNSIPAMPoolMonitor(httpService cns.HTTPService, rc requestcontroller.Req
 	}
 }
 
-func stopReconcile(ch <-chan struct{}) bool {
-	select {
-	case <-ch:
-		return true
-	default:
-	}
-
-	return false
-}
-
 func (pm *CNSIPAMPoolMonitor) Start(ctx context.Context, poolMonitorRefreshMilliseconds int) error {
 	logger.Printf("[ipam-pool-monitor] Starting CNS IPAM Pool Monitor")
 
@@ -60,7 +47,7 @@ func (pm *CNSIPAMPoolMonitor) Start(ctx context.Context, poolMonitorRefreshMilli
 		case <-ctx.Done():
 			return fmt.Errorf("[ipam-pool-monitor] CNS IPAM Pool Monitor received cancellation signal")
 		case <-ticker.C:
-			err := pm.Reconcile()
+			err := pm.Reconcile(ctx)
 			if err != nil {
 				logger.Printf("[ipam-pool-monitor] Reconcile failed with err %v", err)
 			}
@@ -68,7 +55,7 @@ func (pm *CNSIPAMPoolMonitor) Start(ctx context.Context, poolMonitorRefreshMilli
 	}
 }
 
-func (pm *CNSIPAMPoolMonitor) Reconcile() error {
+func (pm *CNSIPAMPoolMonitor) Reconcile(ctx context.Context) error {
 	cnsPodIPConfigCount := len(pm.httpService.GetPodIPConfigState())
 	pendingProgramCount := len(pm.httpService.GetPendingProgramIPConfigs()) // TODO: add pending program count to real cns
 	allocatedPodIPCount := len(pm.httpService.GetAllocatedIPConfigs())
@@ -90,18 +77,18 @@ func (pm *CNSIPAMPoolMonitor) Reconcile() error {
 		}
 
 		logger.Printf("[ipam-pool-monitor] Increasing pool size...%s ", msg)
-		return pm.increasePoolSize()
+		return pm.increasePoolSize(ctx)
 
 	// pod count is decreasing
 	case freeIPConfigCount > pm.MaximumFreeIps:
 		logger.Printf("[ipam-pool-monitor] Decreasing pool size...%s ", msg)
-		return pm.decreasePoolSize(pendingReleaseIPCount)
+		return pm.decreasePoolSize(ctx, pendingReleaseIPCount)
 
 	// CRD has reconciled CNS state, and target spec is now the same size as the state
 	// free to remove the IP's from the CRD
 	case pm.pendingRelease && int(pm.cachedNNC.Spec.RequestedIPCount) == cnsPodIPConfigCount:
 		logger.Printf("[ipam-pool-monitor] Removing Pending Release IP's from CRD...%s ", msg)
-		return pm.cleanPendingRelease()
+		return pm.cleanPendingRelease(ctx)
 
 	// no pods scheduled
 	case allocatedPodIPCount == 0:
@@ -112,7 +99,7 @@ func (pm *CNSIPAMPoolMonitor) Reconcile() error {
 	return nil
 }
 
-func (pm *CNSIPAMPoolMonitor) increasePoolSize() error {
+func (pm *CNSIPAMPoolMonitor) increasePoolSize(ctx context.Context) error {
 	defer pm.mu.Unlock()
 	pm.mu.Lock()
 
@@ -143,7 +130,7 @@ func (pm *CNSIPAMPoolMonitor) increasePoolSize() error {
 
 	logger.Printf("[ipam-pool-monitor] Increasing pool size, Current Pool Size: %v, Updated Requested IP Count: %v, Pods with IP's:%v, ToBeDeleted Count: %v", len(pm.httpService.GetPodIPConfigState()), tempNNCSpec.RequestedIPCount, len(pm.httpService.GetAllocatedIPConfigs()), len(tempNNCSpec.IPsNotInUse))
 
-	err = pm.rc.UpdateCRDSpec(context.Background(), tempNNCSpec)
+	err = pm.rc.UpdateCRDSpec(ctx, tempNNCSpec)
 	if err != nil {
 		// caller will retry to update the CRD again
 		return err
@@ -155,7 +142,7 @@ func (pm *CNSIPAMPoolMonitor) increasePoolSize() error {
 	return nil
 }
 
-func (pm *CNSIPAMPoolMonitor) decreasePoolSize(existingPendingReleaseIPCount int) error {
+func (pm *CNSIPAMPoolMonitor) decreasePoolSize(ctx context.Context, existingPendingReleaseIPCount int) error {
 	defer pm.mu.Unlock()
 	pm.mu.Lock()
 
@@ -215,7 +202,7 @@ func (pm *CNSIPAMPoolMonitor) decreasePoolSize(existingPendingReleaseIPCount int
 	tempNNCSpec.RequestedIPCount -= int64(len(pendingIpAddresses))
 	logger.Printf("[ipam-pool-monitor] Decreasing pool size, Current Pool Size: %v, Requested IP Count: %v, Pods with IP's: %v, ToBeDeleted Count: %v", len(pm.httpService.GetPodIPConfigState()), tempNNCSpec.RequestedIPCount, len(pm.httpService.GetAllocatedIPConfigs()), len(tempNNCSpec.IPsNotInUse))
 
-	err = pm.rc.UpdateCRDSpec(context.Background(), tempNNCSpec)
+	err = pm.rc.UpdateCRDSpec(ctx, tempNNCSpec)
 	if err != nil {
 		// caller will retry to update the CRD again
 		return err
@@ -236,7 +223,7 @@ func (pm *CNSIPAMPoolMonitor) decreasePoolSize(existingPendingReleaseIPCount int
 
 // if cns pending ip release map is empty, request controller has already reconciled the CNS state,
 // so we can remove it from our cache and remove the IP's from the CRD
-func (pm *CNSIPAMPoolMonitor) cleanPendingRelease() error {
+func (pm *CNSIPAMPoolMonitor) cleanPendingRelease(ctx context.Context) error {
 	defer pm.mu.Unlock()
 	pm.mu.Lock()
 
@@ -247,7 +234,7 @@ func (pm *CNSIPAMPoolMonitor) cleanPendingRelease() error {
 		return err
 	}
 
-	err = pm.rc.UpdateCRDSpec(context.Background(), tempNNCSpec)
+	err = pm.rc.UpdateCRDSpec(ctx, tempNNCSpec)
 	if err != nil {
 		// caller will retry to update the CRD again
 		return err

cns/ipampoolmonitor/ipampoolmonitor_test.go

@@ -1,6 +1,7 @@
 package ipampoolmonitor
 
 import (
+	"context"
 	"log"
 	"testing"
 
@@ -50,7 +51,7 @@ func TestPoolSizeIncrease(t *testing.T) {
 	}
 
 	// When poolmonitor reconcile is called, trigger increase and cache goal state
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to allocate test ipconfigs with err: %v", err)
 	}
@@ -68,7 +69,7 @@ func TestPoolSizeIncrease(t *testing.T) {
 
 	// when poolmonitor reconciles again here, the IP count will be within the thresholds
 	// so no CRD update and nothing pending
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to reconcile pool monitor after request controller updates CNS state: %v", err)
 	}
@@ -104,7 +105,7 @@ func TestPoolIncreaseDoesntChangeWhenIncreaseIsAlreadyInProgress(t *testing.T) {
 	}
 
 	// When poolmonitor reconcile is called, trigger increase and cache goal state
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to allocate test ipconfigs with err: %v", err)
 	}
@@ -116,7 +117,7 @@ func TestPoolIncreaseDoesntChangeWhenIncreaseIsAlreadyInProgress(t *testing.T) {
 	}
 
 	// poolmonitor reconciles, but doesn't actually update the CRD, because there is already a pending update
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to reconcile pool monitor after allocation ip increase with err: %v", err)
 	}
@@ -134,7 +135,7 @@ func TestPoolIncreaseDoesntChangeWhenIncreaseIsAlreadyInProgress(t *testing.T) {
 
 	// when poolmonitor reconciles again here, the IP count will be within the thresholds
 	// so no CRD update and nothing pending
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to reconcile pool monitor after request controller updates CNS state: %v", err)
 	}
@@ -173,7 +174,7 @@ func TestPoolSizeIncreaseIdempotency(t *testing.T) {
 	}
 
 	// When poolmonitor reconcile is called, trigger increase and cache goal state
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to allocate test ipconfigs with err: %v", err)
 	}
@@ -184,7 +185,7 @@ func TestPoolSizeIncreaseIdempotency(t *testing.T) {
 	}
 
 	// reconcile pool monitor a second time, then verify requested ip count is still the same
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to allocate test ipconfigs with err: %v", err)
 	}
@@ -216,7 +217,7 @@ func TestPoolIncreasePastNodeLimit(t *testing.T) {
 	}
 
 	// When poolmonitor reconcile is called, trigger increase and cache goal state
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to allocate test ipconfigs with err: %v", err)
 	}
@@ -248,7 +249,7 @@ func TestPoolIncreaseBatchSizeGreaterThanMaxPodIPCount(t *testing.T) {
 	}
 
 	// When poolmonitor reconcile is called, trigger increase and cache goal state
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to allocate test ipconfigs with err: %v", err)
 	}
@@ -297,7 +298,7 @@ func TestPoolDecrease(t *testing.T) {
 	}
 
 	// Pool monitor does nothing, as the current number of IP's falls in the threshold
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -309,7 +310,7 @@ func TestPoolDecrease(t *testing.T) {
 	}
 
 	// Pool monitor will adjust the spec so the pool size will be 1 batch size smaller
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -354,7 +355,7 @@ func TestPoolSizeDecreaseWhenDecreaseHasAlreadyBeenRequested(t *testing.T) {
 	}
 
 	// Pool monitor does nothing, as the current number of IP's falls in the threshold
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected pool monitor to not fail after CNS set number of allocated IP's %v", err)
 	}
@@ -390,7 +391,7 @@ func TestPoolSizeDecreaseWhenDecreaseHasAlreadyBeenRequested(t *testing.T) {
 		t.Error(err)
 	}
 
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected no pool monitor failure after request controller reconcile: %v", err)
 	}
@@ -422,7 +423,7 @@ func TestPoolSizeDecreaseToReallyLow(t *testing.T) {
 	}
 
 	// Pool monitor does nothing, as the current number of IP's falls in the threshold
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected pool monitor to not fail after CNS set number of allocated IP's %v", err)
 	}
@@ -435,7 +436,7 @@ func TestPoolSizeDecreaseToReallyLow(t *testing.T) {
 
 	// Pool monitor does nothing, as the current number of IP's falls in the threshold
 	t.Logf("Reconcile after Allocated count from 33 -> 3, Exepected free count = 10")
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected pool monitor to not fail after CNS set number of allocated IP's %v", err)
 	}
@@ -452,7 +453,7 @@ func TestPoolSizeDecreaseToReallyLow(t *testing.T) {
 
 	// Reconcile again, it should release the second batch
 	t.Logf("Reconcile again - 2, Exepected free count = 20")
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected pool monitor to not fail after CNS set number of allocated IP's %v", err)
 	}
@@ -473,7 +474,7 @@ func TestPoolSizeDecreaseToReallyLow(t *testing.T) {
 		t.Error(err)
 	}
 
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected no pool monitor failure after request controller reconcile: %v", err)
 	}
@@ -505,7 +506,7 @@ func TestDecreaseAfterNodeLimitReached(t *testing.T) {
 		t.Error(err)
 	}
 
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected pool monitor to not fail after CNS set number of allocated IP's %v", err)
 	}
@@ -516,7 +517,7 @@ func TestDecreaseAfterNodeLimitReached(t *testing.T) {
 		t.Error(err)
 	}
 
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected pool monitor to not fail after CNS set number of allocated IP's %v", err)
 	}
@@ -553,7 +554,7 @@ func TestPoolDecreaseBatchSizeGreaterThanMaxPodIPCount(t *testing.T) {
 	}
 
 	// When poolmonitor reconcile is called, trigger increase and cache goal state
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Fatalf("Failed to allocate test ipconfigs with err: %v", err)
 	}
@@ -564,7 +565,7 @@ func TestPoolDecreaseBatchSizeGreaterThanMaxPodIPCount(t *testing.T) {
 		t.Error(err)
 	}
 
-	err = poolmonitor.Reconcile()
+	err = poolmonitor.Reconcile(context.Background())
 	if err != nil {
 		t.Errorf("Expected pool monitor to not fail after CNS set number of allocated IP's %v", err)
 	}

cns/logger/heartbeat.go

@@ -4,13 +4,15 @@
 package logger
 
 import (
+	"context"
 	"time"
 
 	"github.com/Azure/azure-container-networking/aitelemetry"
 )
 
-func SendHeartBeat(heartbeatIntervalInMins int, stopheartbeat chan bool) {
-	heartbeat := time.NewTicker(time.Minute * time.Duration(heartbeatIntervalInMins)).C
+func SendHeartBeat(ctx context.Context, heartbeatIntervalInMins int) {
+	ticker := time.NewTicker(time.Minute * time.Duration(heartbeatIntervalInMins))
+	defer ticker.Stop()
 	metric := aitelemetry.Metric{
 		Name: HeartBeatMetricStr,
 		// This signifies 1 heartbeat is sent. Sum of this metric will give us number of heartbeats received
@@ -19,10 +21,10 @@ func SendHeartBeat(heartbeatIntervalInMins int, stopheartbeat chan bool) {
 	}
 	for {
 		select {
-		case <-heartbeat:
-			SendMetric(metric)
-		case <-stopheartbeat:
+		case <-ctx.Done():
 			return
+		case <-ticker.C:
+			SendMetric(metric)
 		}
 	}
 }

cns/multitenantcontroller/multitenantcontrollerinterface.go

@@ -1,7 +1,9 @@
 package multitenantcontroller
 
-// MultiTenantController defines the interface for multi-tenant network container operations.
-type MultiTenantController interface {
-	StartMultiTenantController(exitChan <-chan struct{}) error
+import "context"
+
+// RequestController defines the interface for multi-tenant network container operations.
+type RequestController interface {
+	Start(context.Context) error
 	IsStarted() bool
 }

cns/multitenantcontroller/multitenantoperator/multitenantcrdcontroller.go

@@ -1,6 +1,7 @@
 package multitenantoperator
 
 import (
+	"context"
 	"errors"
 	"os"
 	"sync"
@@ -8,6 +9,7 @@ import (
 	"github.com/Azure/azure-container-networking/cns/cnsclient"
 	"github.com/Azure/azure-container-networking/cns/cnsclient/httpapi"
 	"github.com/Azure/azure-container-networking/cns/logger"
+	"github.com/Azure/azure-container-networking/cns/multitenantcontroller"
 	"github.com/Azure/azure-container-networking/cns/restserver"
 	ncapi "github.com/Azure/azure-container-networking/crds/multitenantnetworkcontainer/api/v1alpha1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
@@ -25,8 +27,10 @@ const (
 	prometheusAddress = "0" //0 means disabled
 )
 
-// multiTenantController operates multi-tenant CRD.
-type multiTenantController struct {
+var _ (multitenantcontroller.RequestController) = (*requestController)(nil)
+
+// requestController operates multi-tenant CRD.
+type requestController struct {
 	mgr        manager.Manager //Manager starts the reconcile loop which watches for crd status changes
 	KubeClient client.Client   //KubeClient is a cached client which interacts with API server
 	CNSClient  cnsclient.APIClient
@@ -36,8 +40,8 @@ type multiTenantController struct {
 	lock       sync.Mutex
 }
 
-// MultiTenantController create a new multi-tenant CRD operator.
-func NewMultiTenantController(restService *restserver.HTTPRestService, kubeconfig *rest.Config) (*multiTenantController, error) {
+// New creates a new multi-tenant CRD operator.
+func New(restService *restserver.HTTPRestService, kubeconfig *rest.Config) (*requestController, error) {
 	// Check that logger package has been initialized.
 	if logger.Log == nil {
 		return nil, errors.New("Must initialize logger before calling")
@@ -87,7 +91,7 @@ func NewMultiTenantController(restService *restserver.HTTPRestService, kubeconfi
 	}
 
 	// Create the multiTenantController
-	return &multiTenantController{
+	return &requestController{
 		mgr:        mgr,
 		KubeClient: mgr.GetClient(),
 		CNSClient:  httpClient,
@@ -97,19 +101,17 @@ func NewMultiTenantController(restService *restserver.HTTPRestService, kubeconfi
 }
 
 // StartMultiTenantController starts the Reconciler loop which watches for CRD status updates.
-// Blocks until SIGINT or SIGTERM is received
-// Notifies exitChan when kill signal received
-func (mtc *multiTenantController) StartMultiTenantController(exitChan <-chan struct{}) error {
+func (rc *requestController) Start(ctx context.Context) error {
 	logger.Printf("Starting MultiTenantController")
 
 	// Setting the started state
-	mtc.lock.Lock()
-	mtc.Started = true
-	mtc.lock.Unlock()
+	rc.lock.Lock()
+	rc.Started = true
+	rc.lock.Unlock()
 
 	logger.Printf("Starting reconcile loop")
-	if err := mtc.mgr.Start(exitChan); err != nil {
-		if mtc.isNotDefined(err) {
+	if err := rc.mgr.Start(ctx.Done()); err != nil {
+		if rc.isNotDefined(err) {
 			logger.Errorf("multi-tenant CRD is not defined on cluster, starting reconcile loop failed: %v", err)
 			os.Exit(1)
 		}
@@ -120,15 +122,15 @@ func (mtc *multiTenantController) StartMultiTenantController(exitChan <-chan str
 	return nil
 }
 
-// return if RequestController is started
-func (mtc *multiTenantController) IsStarted() bool {
-	defer mtc.lock.Unlock()
-	mtc.lock.Lock()
-	return mtc.Started
+// IsStarted return if RequestController is started
+func (rc *requestController) IsStarted() bool {
+	rc.lock.Lock()
+	defer rc.lock.Unlock()
+	return rc.Started
 }
 
 // isNotDefined tells whether the given error is a CRD not defined error
-func (mtc *multiTenantController) isNotDefined(err error) bool {
+func (rc *requestController) isNotDefined(err error) bool {
 	var (
 		statusError *apierrors.StatusError
 		ok          bool

cns/multitenantcontroller/multitenantoperator/multitenantcrdcontroller_test.go

@@ -20,7 +20,7 @@ var _ = Describe("multiTenantController", func() {
 		kubeconfig := &rest.Config{}
 
 		It("Should exist with an error when nodeName is not set", func() {
-			ctl, err := NewMultiTenantController(restService, kubeconfig)
+			ctl, err := New(restService, kubeconfig)
 			Expect(ctl).To(BeNil())
 			Expect(err).NotTo(BeNil())
 			Expect(err.Error()).To(Equal("Must declare NODENAME environment variable."))
@@ -29,7 +29,7 @@ var _ = Describe("multiTenantController", func() {
 		It("Should report an error when apiserver is not available", func() {
 			val := os.Getenv(nodeNameEnvVar)
 			os.Setenv(nodeNameEnvVar, "nodeName")
-			ctl, err := NewMultiTenantController(nil, nil)
+			ctl, err := New(nil, nil)
 			os.Setenv(nodeNameEnvVar, val)
 			Expect(ctl).To(BeNil())
 			Expect(err).NotTo(BeNil())

cns/restserver/util.go

@@ -4,6 +4,7 @@
 package restserver
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -655,18 +656,18 @@ func (service *HTTPRestService) logNCSnapshots() {
 }
 
 // Sets up periodic timer for sending network container snapshots
-func (service *HTTPRestService) SendNCSnapShotPeriodically(ncSnapshotIntervalInMinutes int, stopSnapshot chan bool) {
-
+func (service *HTTPRestService) SendNCSnapShotPeriodically(ctx context.Context, ncSnapshotIntervalInMinutes int) {
 	// Emit snapshot on startup and then emit it periodically.
 	service.logNCSnapshots()
 
-	snapshot := time.NewTicker(time.Minute * time.Duration(ncSnapshotIntervalInMinutes)).C
+	ticker := time.NewTicker(time.Minute * time.Duration(ncSnapshotIntervalInMinutes))
+	defer ticker.Stop()
 	for {
 		select {
-		case <-snapshot:
-			service.logNCSnapshots()
-		case <-stopSnapshot:
+		case <-ctx.Done():
 			return
+		case <-ticker.C:
+			service.logNCSnapshots()
 		}
 	}
 }

cns/service/main.go

@@ -31,9 +31,9 @@ import (
 	"github.com/Azure/azure-container-networking/cns/multitenantcontroller"
 	"github.com/Azure/azure-container-networking/cns/multitenantcontroller/multitenantoperator"
 	"github.com/Azure/azure-container-networking/cns/nmagentclient"
-	"github.com/Azure/azure-container-networking/cns/requestcontroller"
-	"github.com/Azure/azure-container-networking/cns/requestcontroller/kubecontroller"
 	"github.com/Azure/azure-container-networking/cns/restserver"
+	"github.com/Azure/azure-container-networking/cns/singletenantcontroller"
+	"github.com/Azure/azure-container-networking/cns/singletenantcontroller/kubecontroller"
 	acn "github.com/Azure/azure-container-networking/common"
 	"github.com/Azure/azure-container-networking/log"
 	"github.com/Azure/azure-container-networking/platform"
@@ -55,11 +55,11 @@ const (
 	maxRetryNodeRegister = 720
 )
 
+var rootCtx context.Context
+var rootErrCh chan error
+
 // Version is populated by make during build.
 var version string
-var telemetryStopProcessing = make(chan bool)
-var stopheartbeat = make(chan bool)
-var stopSnapshots = make(chan bool)
 
 // Command line arguments for CNS.
 var args = acn.ArgumentList{
@@ -243,6 +243,30 @@ var args = acn.ArgumentList{
 	},
 }
 
+// init() is executed before main() whenever this package is imported
+// to do pre-run setup of things like exit signal handling and building
+// the root context.
+func init() {
+	var cancel context.CancelFunc
+	rootCtx, cancel = context.WithCancel(context.Background())
+
+	rootErrCh = make(chan error, 1)
+
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
+
+	go func() {
+		// Wait until receiving a signal.
+		select {
+		case sig := <-sigCh:
+			log.Errorf("caught exit signal %v, exiting", sig)
+		case err := <-rootErrCh:
+			log.Errorf("unhandled error %v, exiting", err)
+		}
+		cancel()
+	}()
+}
+
 // Prints description and version information.
 func printVersion() {
 	fmt.Printf("Azure Container Network Service\n")
@@ -376,7 +400,7 @@ func main() {
 	config.Version = version
 	config.Name = name
 	// Create a channel to receive unhandled errors from CNS.
-	config.ErrChan = make(chan error, 1)
+	config.ErrChan = rootErrCh
 
 	// Create logging provider.
 	logger.InitLogger(name, logLevel, logTarget, logDirectory)
@@ -502,9 +526,7 @@ func main() {
 	// Initialze state in if CNS is running in CRD mode
 	// State must be initialized before we start HTTPRestService
 	if config.ChannelMode == cns.CRD {
-		requestControllerStopChannel := make(chan struct{})
-		defer close(requestControllerStopChannel)
-		err = InitializeCRDState(httpRestService, cnsconfig, requestControllerStopChannel)
+		err = InitializeCRDState(httpRestService, cnsconfig)
 		if err != nil {
 			logger.Errorf("Failed to start CRD Controller, err:%v.\n", err)
 			return
@@ -514,9 +536,7 @@ func main() {
 	// Initialize multi-tenant controller if the CNS is running in MultiTenantCRD mode.
 	// It must be started before we start HTTPRestService.
 	if config.ChannelMode == cns.MultiTenantCRD {
-		multiTenantControllerStopChannel := make(chan struct{})
-		defer close(multiTenantControllerStopChannel)
-		err = InitializeMultiTenantController(httpRestService, cnsconfig, multiTenantControllerStopChannel)
+		err = InitializeMultiTenantController(httpRestService, cnsconfig)
 		if err != nil {
 			logger.Errorf("Failed to start multiTenantController, err:%v.\n", err)
 			return
@@ -533,8 +553,8 @@ func main() {
 	}
 
 	if !disableTelemetry {
-		go logger.SendHeartBeat(cnsconfig.TelemetrySettings.HeartBeatIntervalInMins, stopheartbeat)
-		go httpRestService.SendNCSnapShotPeriodically(cnsconfig.TelemetrySettings.SnapshotIntervalInMins, stopSnapshots)
+		go logger.SendHeartBeat(rootCtx, cnsconfig.TelemetrySettings.HeartBeatIntervalInMins)
+		go httpRestService.SendNCSnapShotPeriodically(rootCtx, cnsconfig.TelemetrySettings.SnapshotIntervalInMins)
 	}
 
 	// If CNS is running on managed DNC mode
@@ -622,17 +642,8 @@ func main() {
 		}
 	}
 
-	// Relay these incoming signals to OS signal channel.
-	osSignalChannel := make(chan os.Signal, 1)
-	signal.Notify(osSignalChannel, os.Interrupt, os.Kill, syscall.SIGTERM)
-
-	// Wait until receiving a signal.
-	select {
-	case sig := <-osSignalChannel:
-		logger.Printf("CNS Received OS signal <" + sig.String() + ">, shutting down.")
-	case err := <-config.ErrChan:
-		logger.Printf("CNS Received unhandled error %v, shutting down.", err)
-	}
+	// block until process exiting
+	<-rootCtx.Done()
 
 	if len(strings.TrimSpace(createDefaultExtNetworkType)) > 0 {
 		if err := hnsclient.DeleteDefaultExtNetwork(); err == nil {
@@ -642,26 +653,6 @@ func main() {
 		}
 	}
 
-	if !disableTelemetry {
-		logger.Printf("stopping telemetry service thread")
-		select {
-		case telemetryStopProcessing <- true:
-		default:
-		}
-
-		logger.Printf("stop heartbeat thread")
-		select {
-		case stopheartbeat <- true:
-		default:
-		}
-
-		logger.Printf("stop snapshot thread")
-		select {
-		case stopSnapshots <- true:
-		default:
-		}
-	}
-
 	logger.Printf("stop cns service")
 	// Cleanup.
 	if httpRestService != nil {
@@ -684,8 +675,8 @@ func main() {
 	logger.Close()
 }
 
-func InitializeMultiTenantController(httpRestService cns.HTTPService, cnsconfig configuration.CNSConfig, exitChan <-chan struct{}) error {
-	var multiTenantController multitenantcontroller.MultiTenantController
+func InitializeMultiTenantController(httpRestService cns.HTTPService, cnsconfig configuration.CNSConfig) error {
+	var multiTenantController multitenantcontroller.RequestController
 	kubeConfig, err := ctrl.GetConfig()
 	if err != nil {
 		return err
@@ -706,7 +697,7 @@ func InitializeMultiTenantController(httpRestService cns.HTTPService, cnsconfig
 	httpRestServiceImpl.SetNodeOrchestrator(&orchestrator)
 
 	// Create multiTenantController.
-	multiTenantController, err = multitenantoperator.NewMultiTenantController(httpRestServiceImpl, kubeConfig)
+	multiTenantController, err = multitenantoperator.New(httpRestServiceImpl, kubeConfig)
 	if err != nil {
 		logger.Errorf("Failed to create multiTenantController:%v", err)
 		return err
@@ -715,7 +706,7 @@ func InitializeMultiTenantController(httpRestService cns.HTTPService, cnsconfig
 	// Wait for multiTenantController to start.
 	go func() {
 		for {
-			if err := multiTenantController.StartMultiTenantController(exitChan); err != nil {
+			if err := multiTenantController.Start(rootCtx); err != nil {
 				logger.Errorf("Failed to start multiTenantController: %v", err)
 			} else {
 				logger.Printf("Exiting multiTenantController")
@@ -756,8 +747,8 @@ func InitializeMultiTenantController(httpRestService cns.HTTPService, cnsconfig
 }
 
 // initializeCRD state
-func InitializeCRDState(httpRestService cns.HTTPService, cnsconfig configuration.CNSConfig, exitChan <-chan struct{}) error {
-	var requestController requestcontroller.RequestController
+func InitializeCRDState(httpRestService cns.HTTPService, cnsconfig configuration.CNSConfig) error {
+	var requestController singletenantcontroller.RequestController
 
 	logger.Printf("[Azure CNS] Starting request controller")
 
@@ -782,7 +773,7 @@ func InitializeCRDState(httpRestService cns.HTTPService, cnsconfig configuration
 	httpRestServiceImplementation.SetNodeOrchestrator(&orchestrator)
 
 	// Get crd implementation of request controller
-	requestController, err = kubecontroller.NewCrdRequestController(httpRestServiceImplementation, kubeConfig)
+	requestController, err = kubecontroller.New(httpRestServiceImplementation, kubeConfig)
 	if err != nil {
 		logger.Errorf("[Azure CNS] Failed to make crd request controller :%v", err)
 		return err
@@ -791,7 +782,7 @@ func InitializeCRDState(httpRestService cns.HTTPService, cnsconfig configuration
 	// initialize the ipam pool monitor
 	httpRestServiceImplementation.IPAMPoolMonitor = ipampoolmonitor.NewCNSIPAMPoolMonitor(httpRestServiceImplementation, requestController)
 
-	err = requestController.InitRequestController()
+	err = requestController.Init(rootCtx)
 	if err != nil {
 		logger.Errorf("[Azure CNS] Failed to initialized cns state :%v", err)
 		return err
@@ -800,7 +791,7 @@ func InitializeCRDState(httpRestService cns.HTTPService, cnsconfig configuration
 	//Start the RequestController which starts the reconcile loop
 	go func() {
 		for {
-			if err := requestController.StartRequestController(exitChan); err != nil {
+			if err := requestController.Start(rootCtx); err != nil {
 				logger.Errorf("[Azure CNS] Failed to start request controller: %v", err)
 				// retry to start the request controller
 				// todo: add a CNS metric to count # of failures
@@ -824,11 +815,10 @@ func InitializeCRDState(httpRestService cns.HTTPService, cnsconfig configuration
 		time.Sleep(time.Millisecond * 500)
 	}
 
-	ctx := context.Background()
 	logger.Printf("Starting IPAM Pool Monitor")
 	go func() {
 		for {
-			if err := httpRestServiceImplementation.IPAMPoolMonitor.Start(ctx, poolIPAMRefreshRateInMilliseconds); err != nil {
+			if err := httpRestServiceImplementation.IPAMPoolMonitor.Start(rootCtx, poolIPAMRefreshRateInMilliseconds); err != nil {
 				logger.Errorf("[Azure CNS] Failed to start pool monitor with err: %v", err)
 				// todo: add a CNS metric to count # of failures
 			} else {
@@ -842,15 +832,14 @@ func InitializeCRDState(httpRestService cns.HTTPService, cnsconfig configuration
 	}()
 
 	logger.Printf("Starting SyncHostNCVersion")
-	rootCxt := context.Background()
 	go func() {
 		// Periodically poll vfp programmed NC version from NMAgent
 		tickerChannel := time.Tick(cnsconfig.SyncHostNCVersionIntervalMs * time.Millisecond)
 		for {
 			select {
 			case <-tickerChannel:
-				httpRestServiceImplementation.SyncHostNCVersion(rootCxt, cnsconfig.ChannelMode, cnsconfig.SyncHostNCTimeoutMs)
-            case <-rootCxt.Done():
+				httpRestServiceImplementation.SyncHostNCVersion(rootCtx, cnsconfig.ChannelMode, cnsconfig.SyncHostNCTimeoutMs)
+			case <-rootCtx.Done():
 				return
 			}
 		}

cns/singletenantcontroller/kubecontroller/crdrequestcontroller.go

@@ -12,6 +12,7 @@ import (
 	"github.com/Azure/azure-container-networking/cns/cnsclient/httpapi"
 	"github.com/Azure/azure-container-networking/cns/logger"
 	"github.com/Azure/azure-container-networking/cns/restserver"
+	"github.com/Azure/azure-container-networking/cns/singletenantcontroller"
 	nnc "github.com/Azure/azure-container-networking/nodenetworkconfig/api/v1alpha"
 	corev1 "k8s.io/api/core/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
@@ -32,10 +33,12 @@ const (
 	prometheusAddress = "0" //0 means disabled
 )
 
-// crdRequestController
+var _ singletenantcontroller.RequestController = (*requestController)(nil)
+
+// requestController
 // - watches CRD status changes
 // - updates CRD spec
-type crdRequestController struct {
+type requestController struct {
 	mgr             manager.Manager //Manager starts the reconcile loop which watches for crd status changes
 	KubeClient      KubeClient      //KubeClient is a cached client which interacts with API server
 	directAPIClient DirectAPIClient //Direct client to interact with API server
@@ -61,8 +64,8 @@ func GetKubeConfig() (*rest.Config, error) {
 	return k8sconfig, nil
 }
 
-//NewCrdRequestController given a reference to CNS's HTTPRestService state, returns a crdRequestController struct
-func NewCrdRequestController(restService *restserver.HTTPRestService, kubeconfig *rest.Config) (*crdRequestController, error) {
+// New given a reference to CNS's HTTPRestService state, returns a crdRequestController struct
+func New(restService *restserver.HTTPRestService, kubeconfig *rest.Config) (*requestController, error) {
 
 	//Check that logger package has been intialized
 	if logger.Log == nil {
@@ -130,7 +133,7 @@ func NewCrdRequestController(restService *restserver.HTTPRestService, kubeconfig
 	}
 
 	// Create the requestController
-	crdRequestController := crdRequestController{
+	rc := requestController{
 		mgr:             mgr,
 		KubeClient:      mgr.GetClient(),
 		directAPIClient: directAPIClient,
@@ -140,44 +143,42 @@ func NewCrdRequestController(restService *restserver.HTTPRestService, kubeconfig
 		Reconciler:      crdreconciler,
 	}
 
-	return &crdRequestController, nil
+	return &rc, nil
 }
 
-// InitRequestController will initialize/reconcile the CNS state
-func (crdRC *crdRequestController) InitRequestController() error {
+// Init will initialize/reconcile the CNS state
+func (rc *requestController) Init(ctx context.Context) error {
 	logger.Printf("InitRequestController")
 
-	defer crdRC.lock.Unlock()
-	crdRC.lock.Lock()
+	defer rc.lock.Unlock()
+	rc.lock.Lock()
 
-	if err := crdRC.initCNS(); err != nil {
+	if err := rc.initCNS(ctx); err != nil {
 		logger.Errorf("[cns-rc] Error initializing cns state: %v", err)
 		return err
 	}
 
-	crdRC.initialized = true
+	rc.initialized = true
 	return nil
 }
 
-// StartRequestController starts the Reconciler loop which watches for CRD status updates
-// Blocks until SIGINT or SIGTERM is received
-// Notifies exitChan when kill signal received
-func (crdRC *crdRequestController) StartRequestController(exitChan <-chan struct{}) error {
+// Start starts the Reconciler loop which watches for CRD status updates
+func (rc *requestController) Start(ctx context.Context) error {
 	logger.Printf("StartRequestController")
 
-	crdRC.lock.Lock()
-	if crdRC.initialized != true {
-		crdRC.lock.Unlock()
-		return fmt.Errorf("Failed to start requestController, state is not initialized [%v]", crdRC)
+	rc.lock.Lock()
+	if !rc.initialized {
+		rc.lock.Unlock()
+		return fmt.Errorf("Failed to start requestController, state is not initialized [%v]", rc)
 	}
 
 	// Setting the started state
-	crdRC.Started = true
-	crdRC.lock.Unlock()
+	rc.Started = true
+	rc.lock.Unlock()
 
 	logger.Printf("Starting reconcile loop")
-	if err := crdRC.mgr.Start(exitChan); err != nil {
-		if crdRC.isNotDefined(err) {
+	if err := rc.mgr.Start(ctx.Done()); err != nil {
+		if rc.isNotDefined(err) {
 			logger.Errorf("[cns-rc] CRD is not defined on cluster, starting reconcile loop failed: %v", err)
 			os.Exit(1)
 		}
@@ -189,31 +190,28 @@ func (crdRC *crdRequestController) StartRequestController(exitChan <-chan struct
 }
 
 // return if RequestController is started
-func (crdRC *crdRequestController) IsStarted() bool {
-	defer crdRC.lock.Unlock()
-	crdRC.lock.Lock()
-	return crdRC.Started
+func (rc *requestController) IsStarted() bool {
+	defer rc.lock.Unlock()
+	rc.lock.Lock()
+	return rc.Started
 }
 
 // InitCNS initializes cns by passing pods and a createnetworkcontainerrequest
-func (crdRC *crdRequestController) initCNS() error {
+func (rc *requestController) initCNS(ctx context.Context) error {
 	var (
 		pods          *corev1.PodList
 		pod           corev1.Pod
 		podInfo       cns.KubernetesPodInfo
 		nodeNetConfig *nnc.NodeNetworkConfig
 		podInfoByIP   map[string]cns.KubernetesPodInfo
-		cntxt         context.Context
 		ncRequest     cns.CreateNetworkContainerRequest
 		err           error
 	)
 
-	cntxt = context.Background()
-
 	// Get nodeNetConfig using direct client
-	if nodeNetConfig, err = crdRC.getNodeNetConfigDirect(cntxt, crdRC.nodeName, k8sNamespace); err != nil {
+	if nodeNetConfig, err = rc.getNodeNetConfigDirect(ctx, rc.nodeName, k8sNamespace); err != nil {
 		// If the CRD is not defined, exit
-		if crdRC.isNotDefined(err) {
+		if rc.isNotDefined(err) {
 			logger.Errorf("CRD is not defined on cluster: %v", err)
 			os.Exit(1)
 		}
@@ -225,7 +223,7 @@ func (crdRC *crdRequestController) initCNS() error {
 
 		// If instance of crd is not found, pass nil to CNSClient
 		if client.IgnoreNotFound(err) == nil {
-			return crdRC.CNSClient.ReconcileNCState(nil, nil, nodeNetConfig.Status.Scaler, nodeNetConfig.Spec)
+			return rc.CNSClient.ReconcileNCState(nil, nil, nodeNetConfig.Status.Scaler, nodeNetConfig.Spec)
 		}
 
 		// If it's any other error, log it and return
@@ -235,7 +233,7 @@ func (crdRC *crdRequestController) initCNS() error {
 
 	// If there are no NCs, pass nil to CNSClient
 	if len(nodeNetConfig.Status.NetworkContainers) == 0 {
-		return crdRC.CNSClient.ReconcileNCState(nil, nil, nodeNetConfig.Status.Scaler, nodeNetConfig.Spec)
+		return rc.CNSClient.ReconcileNCState(nil, nil, nodeNetConfig.Status.Scaler, nodeNetConfig.Spec)
 	}
 
 	// Convert to CreateNetworkContainerRequest
@@ -245,7 +243,7 @@ func (crdRC *crdRequestController) initCNS() error {
 	}
 
 	// Get all pods using direct client
-	if pods, err = crdRC.getAllPods(cntxt, crdRC.nodeName); err != nil {
+	if pods, err = rc.getAllPods(ctx, rc.nodeName); err != nil {
 		logger.Errorf("Error when getting all pods when initializing cns: %v", err)
 		return err
 	}
@@ -266,13 +264,13 @@ func (crdRC *crdRequestController) initCNS() error {
 	}
 
 	// Call cnsclient init cns passing those two things
-	return crdRC.CNSClient.ReconcileNCState(&ncRequest, podInfoByIP, nodeNetConfig.Status.Scaler, nodeNetConfig.Spec)
+	return rc.CNSClient.ReconcileNCState(&ncRequest, podInfoByIP, nodeNetConfig.Status.Scaler, nodeNetConfig.Spec)
 
 }
 
 // UpdateCRDSpec updates the CRD spec
-func (crdRC *crdRequestController) UpdateCRDSpec(cntxt context.Context, crdSpec nnc.NodeNetworkConfigSpec) error {
-	nodeNetworkConfig, err := crdRC.getNodeNetConfig(cntxt, crdRC.nodeName, k8sNamespace)
+func (rc *requestController) UpdateCRDSpec(ctx context.Context, crdSpec nnc.NodeNetworkConfigSpec) error {
+	nodeNetworkConfig, err := rc.getNodeNetConfig(ctx, rc.nodeName, k8sNamespace)
 	if err != nil {
 		logger.Errorf("[cns-rc] Error getting CRD when updating spec %v", err)
 		return err
@@ -286,7 +284,7 @@ func (crdRC *crdRequestController) UpdateCRDSpec(cntxt context.Context, crdSpec
 	logger.Printf("[cns-rc] After deep copy %+v", nodeNetworkConfig.Spec)
 
 	//Send update to API server
-	if err := crdRC.updateNodeNetConfig(cntxt, nodeNetworkConfig); err != nil {
+	if err := rc.updateNodeNetConfig(ctx, nodeNetworkConfig); err != nil {
 		logger.Errorf("[cns-rc] Error updating CRD spec %v", err)
 		return err
 	}
@@ -295,10 +293,10 @@ func (crdRC *crdRequestController) UpdateCRDSpec(cntxt context.Context, crdSpec
 }
 
 // getNodeNetConfig gets the nodeNetworkConfig CRD given the name and namespace of the CRD object
-func (crdRC *crdRequestController) getNodeNetConfig(cntxt context.Context, name, namespace string) (*nnc.NodeNetworkConfig, error) {
+func (rc *requestController) getNodeNetConfig(ctx context.Context, name, namespace string) (*nnc.NodeNetworkConfig, error) {
 	nodeNetworkConfig := &nnc.NodeNetworkConfig{}
 
-	err := crdRC.KubeClient.Get(cntxt, client.ObjectKey{
+	err := rc.KubeClient.Get(ctx, client.ObjectKey{
 		Namespace: namespace,
 		Name:      name,
 	}, nodeNetworkConfig)
@@ -311,13 +309,13 @@ func (crdRC *crdRequestController) getNodeNetConfig(cntxt context.Context, name,
 }
 
 // getNodeNetConfigDirect gets the nodeNetworkConfig CRD using a direct client
-func (crdRC *crdRequestController) getNodeNetConfigDirect(cntxt context.Context, name, namespace string) (*nnc.NodeNetworkConfig, error) {
+func (rc *requestController) getNodeNetConfigDirect(ctx context.Context, name, namespace string) (*nnc.NodeNetworkConfig, error) {
 	var (
 		nodeNetworkConfig *nnc.NodeNetworkConfig
 		err               error
 	)
 
-	if nodeNetworkConfig, err = crdRC.directCRDClient.Get(cntxt, name, namespace, crdTypeName); err != nil {
+	if nodeNetworkConfig, err = rc.directCRDClient.Get(ctx, name, namespace, crdTypeName); err != nil {
 		return nil, err
 	}
 
@@ -325,8 +323,8 @@ func (crdRC *crdRequestController) getNodeNetConfigDirect(cntxt context.Context,
 }
 
 // updateNodeNetConfig updates the nodeNetConfig object in the API server with the given nodeNetworkConfig object
-func (crdRC *crdRequestController) updateNodeNetConfig(cntxt context.Context, nodeNetworkConfig *nnc.NodeNetworkConfig) error {
-	if err := crdRC.KubeClient.Update(cntxt, nodeNetworkConfig); err != nil {
+func (rc *requestController) updateNodeNetConfig(ctx context.Context, nodeNetworkConfig *nnc.NodeNetworkConfig) error {
+	if err := rc.KubeClient.Update(ctx, nodeNetworkConfig); err != nil {
 		return err
 	}
 
@@ -334,13 +332,13 @@ func (crdRC *crdRequestController) updateNodeNetConfig(cntxt context.Context, no
 }
 
 // getAllPods gets all pods running on the node using the direct API client
-func (crdRC *crdRequestController) getAllPods(cntxt context.Context, node string) (*corev1.PodList, error) {
+func (rc *requestController) getAllPods(ctx context.Context, node string) (*corev1.PodList, error) {
 	var (
 		pods *corev1.PodList
 		err  error
 	)
 
-	if pods, err = crdRC.directAPIClient.ListPods(cntxt, allNamespaces, node); err != nil {
+	if pods, err = rc.directAPIClient.ListPods(ctx, allNamespaces, node); err != nil {
 		return nil, err
 	}
 
@@ -348,7 +346,7 @@ func (crdRC *crdRequestController) getAllPods(cntxt context.Context, node string
 }
 
 // isNotDefined tells whether the given error is a CRD not defined error
-func (crdRC *crdRequestController) isNotDefined(err error) bool {
+func (rc *requestController) isNotDefined(err error) bool {
 	var (
 		statusError *apierrors.StatusError
 		ok          bool

cns/singletenantcontroller/kubecontroller/crdrequestcontroller_test.go

@@ -29,7 +29,6 @@ const (
 	networkContainerID   = "24fcd232-0364-41b0-8027-6e6ef9aeabc6"
 	existingNamespace    = k8sNamespace
 	nonexistingNNCName   = "nodenetconfig_nonexisting"
-	nonexistingPodName   = "pod_nonexisting"
 	nonexistingNamespace = "namespace_nonexisting"
 	ncPrimaryIP          = "10.0.0.1"
 	subnetRange          = "10.0.0.0/24"
@@ -130,7 +129,7 @@ type MockDirectCRDClient struct {
 	mockAPI *MockAPI
 }
 
-func (mc *MockDirectCRDClient) Get(cntxt context.Context, name, namespace, typeName string) (*nnc.NodeNetworkConfig, error) {
+func (mc *MockDirectCRDClient) Get(ctx context.Context, name, namespace, typeName string) (*nnc.NodeNetworkConfig, error) {
 	var (
 		mockKey       MockKey
 		nodeNetConfig *nnc.NodeNetworkConfig
@@ -157,7 +156,7 @@ type MockDirectAPIClient struct {
 	mockAPI *MockAPI
 }
 
-func (mc *MockDirectAPIClient) ListPods(cntxt context.Context, namespace, node string) (*corev1.PodList, error) {
+func (mc *MockDirectAPIClient) ListPods(ctx context.Context, namespace, node string) (*corev1.PodList, error) {
 	var (
 		pod  *corev1.Pod
 		pods corev1.PodList
@@ -179,7 +178,7 @@ func (mc *MockDirectAPIClient) ListPods(cntxt context.Context, namespace, node s
 }
 func TestNewCrdRequestController(t *testing.T) {
 	//Test making request controller without logger initialized, should fail
-	_, err := NewCrdRequestController(nil, nil)
+	_, err := New(nil, nil)
 	if err == nil {
 		t.Fatalf("Expected error when making NewCrdRequestController without initializing logger, got nil error")
 	} else if !strings.Contains(err.Error(), "logger") {
@@ -199,7 +198,7 @@ func TestNewCrdRequestController(t *testing.T) {
 		}
 	}()
 
-	_, err = NewCrdRequestController(nil, nil)
+	_, err = New(nil, nil)
 	if err == nil {
 		t.Fatalf("Expected error when making NewCrdRequestController without setting " + nodeNameEnvVar + " env var, got nil error")
 	} else if !strings.Contains(err.Error(), nodeNameEnvVar) {
@@ -228,7 +227,7 @@ func TestGetNonExistingNodeNetConfig(t *testing.T) {
 	mockKubeClient := MockKubeClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		KubeClient: mockKubeClient,
 	}
 	logger.InitLogger("Azure CNS RequestController", 0, 0, "")
@@ -260,7 +259,7 @@ func TestGetExistingNodeNetConfig(t *testing.T) {
 	mockKubeClient := MockKubeClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		KubeClient: mockKubeClient,
 	}
 	logger.InitLogger("Azure CNS RequestController", 0, 0, "")
@@ -295,7 +294,7 @@ func TestUpdateNonExistingNodeNetConfig(t *testing.T) {
 	mockKubeClient := MockKubeClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		KubeClient: mockKubeClient,
 	}
 	logger.InitLogger("Azure CNS RequestController", 0, 0, "")
@@ -332,7 +331,7 @@ func TestUpdateExistingNodeNetConfig(t *testing.T) {
 	mockKubeClient := MockKubeClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		nodeName:   existingNNCName,
 		KubeClient: mockKubeClient,
 	}
@@ -372,7 +371,7 @@ func TestUpdateSpecOnNonExistingNodeNetConfig(t *testing.T) {
 	mockKubeClient := MockKubeClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		nodeName:   nonexistingNNCName,
 		KubeClient: mockKubeClient,
 	}
@@ -413,7 +412,7 @@ func TestUpdateSpecOnExistingNodeNetConfig(t *testing.T) {
 	mockKubeClient := MockKubeClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		nodeName:   existingNNCName,
 		KubeClient: mockKubeClient,
 	}
@@ -459,7 +458,7 @@ func TestGetExistingNNCDirectClient(t *testing.T) {
 	mockCRDDirectClient := &MockDirectCRDClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		directCRDClient: mockCRDDirectClient,
 	}
 
@@ -495,7 +494,7 @@ func TestGetNonExistingNNCDirectClient(t *testing.T) {
 	mockCRDDirectClient := &MockDirectCRDClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		directCRDClient: mockCRDDirectClient,
 	}
 
@@ -533,7 +532,7 @@ func TestGetPodsExistingNodeDirectClient(t *testing.T) {
 	mockAPIDirectClient := &MockDirectAPIClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		directAPIClient: mockAPIDirectClient,
 	}
 
@@ -574,7 +573,7 @@ func TestGetPodsNonExistingNodeDirectClient(t *testing.T) {
 	mockAPIDirectClient := &MockDirectAPIClient{
 		mockAPI: mockAPI,
 	}
-	rc := &crdRequestController{
+	rc := &requestController{
 		directAPIClient: mockAPIDirectClient,
 	}
 
@@ -660,14 +659,14 @@ func TestInitRequestController(t *testing.T) {
 		mockAPI: mockAPI,
 	}
 	mockCNSClient := &MockCNSClient{}
-	rc := &crdRequestController{
+	rc := &requestController{
 		directAPIClient: mockAPIDirectClient,
 		directCRDClient: mockCRDDirectClient,
 		CNSClient:       mockCNSClient,
 		nodeName:        existingNNCName,
 	}
 
-	if err := rc.initCNS(); err != nil {
+	if err := rc.initCNS(context.Background()); err != nil {
 		t.Fatalf("Expected no failure to init cns when given mock clients")
 	}
 

cns/singletenantcontroller/kubecontroller/directapiclient.go

@@ -18,13 +18,13 @@ type APIDirectClient struct {
 }
 
 // ListPods lists all pods in the given namespace and node
-func (apiClient *APIDirectClient) ListPods(cntxt context.Context, namespace, node string) (*corev1.PodList, error) {
+func (apiClient *APIDirectClient) ListPods(ctx context.Context, namespace, node string) (*corev1.PodList, error) {
 	var (
 		pods *corev1.PodList
 		err  error
 	)
 
-	pods, err = apiClient.clientset.CoreV1().Pods(namespace).List(cntxt, metav1.ListOptions{
+	pods, err = apiClient.clientset.CoreV1().Pods(namespace).List(ctx, metav1.ListOptions{
 		FieldSelector: "spec.nodeName=" + node,
 	})
 

cns/singletenantcontroller/kubecontroller/directcrdclient.go

@@ -18,14 +18,14 @@ type CRDDirectClient struct {
 }
 
 // Get gets a crd
-func (crdClient *CRDDirectClient) Get(cntxt context.Context, name, namespace, typeName string) (*nnc.NodeNetworkConfig, error) {
+func (crdClient *CRDDirectClient) Get(ctx context.Context, name, namespace, typeName string) (*nnc.NodeNetworkConfig, error) {
 	var (
 		nodeNetConfig *nnc.NodeNetworkConfig
 		err           error
 	)
 
 	nodeNetConfig = &nnc.NodeNetworkConfig{}
-	if err = crdClient.restClient.Get().Namespace(namespace).Resource(crdTypeName).Name(name).Do(cntxt).Into(nodeNetConfig); err != nil {
+	if err = crdClient.restClient.Get().Namespace(namespace).Resource(crdTypeName).Name(name).Do(ctx).Into(nodeNetConfig); err != nil {
 		return nil, err
 	}
 

cns/singletenantcontroller/kubecontroller/kubeclientinterface.go

@@ -18,10 +18,10 @@ type KubeClient interface {
 
 // DirectCRDClient is an interface to get CRDs directly, without cache
 type DirectCRDClient interface {
-	Get(cntxt context.Context, name, namespace, typeName string) (*nnc.NodeNetworkConfig, error)
+	Get(ctx context.Context, name, namespace, typeName string) (*nnc.NodeNetworkConfig, error)
 }
 
 // DirectAPIClient is an interface to talk directly with API Server without cache
 type DirectAPIClient interface {
-	ListPods(cntxt context.Context, namespace, node string) (*corev1.PodList, error)
+	ListPods(ctx context.Context, namespace, node string) (*corev1.PodList, error)
 }

cns/singletenantcontroller/requestcontrollerinterface.go

@@ -1,4 +1,4 @@
-package requestcontroller
+package singletenantcontroller
 
 import (
 	"context"
@@ -8,8 +8,8 @@ import (
 
 // RequestController interface for cns to interact with the request controller
 type RequestController interface {
-	InitRequestController() error
-	StartRequestController(exitChan <-chan struct{}) error
-	UpdateCRDSpec(cntxt context.Context, crdSpec nnc.NodeNetworkConfigSpec) error
+	Init(context.Context) error
+	Start(context.Context) error
+	UpdateCRDSpec(context.Context, nnc.NodeNetworkConfigSpec) error
 	IsStarted() bool
 }

common/listener.go

@@ -7,13 +7,13 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
-	localtls "github.com/Azure/azure-container-networking/server/tls"
 	"net"
 	"net/http"
 	"net/url"
 	"os"
 
 	"github.com/Azure/azure-container-networking/log"
+	localtls "github.com/Azure/azure-container-networking/server/tls"
 )
 
 // Listener represents an HTTP listener.
@@ -73,7 +73,7 @@ func GetTlsConfig(tlsSettings localtls.TlsSettings) (*tls.Config, error) {
 }
 
 // Start creates the listener socket and starts the HTTPS server.
-func (listener *Listener) StartTLS(errChan chan error, tlsSettings localtls.TlsSettings) error {
+func (listener *Listener) StartTLS(errChan chan<- error, tlsSettings localtls.TlsSettings) error {
 	tlsConfig, err := GetTlsConfig(tlsSettings)
 	if err != nil {
 		log.Printf("[Listener] Failed to compose Tls Configuration with errror: %+v", err)
@@ -102,7 +102,7 @@ func (listener *Listener) StartTLS(errChan chan error, tlsSettings localtls.TlsS
 }
 
 // Start creates the listener socket and starts the HTTP server.
-func (listener *Listener) Start(errChan chan error) error {
+func (listener *Listener) Start(errChan chan<- error) error {
 	var err error
 
 	// Succeed early if no socket was requested.