From 5f973eb47ae97b310c668a033c5c460dcaf99f8f Mon Sep 17 00:00:00 2001
From: Connor Peet <connor@peet.io>
Date: Sat, 19 Sep 2020 12:38:13 -0700
Subject: [PATCH] feat: allow passing a set of default CallOptions in new
 Etcd3()

---
 .vscode/launch.json                      |   14 +-
 .vscode/settings.json                    |   10 +-
 .vscode/tasks.json                       |   15 +
 bin/generate-methods.js                  |   37 +-
 bin/template/call-context.tmpl           |    1 +
 bin/template/class-header.tmpl           |    2 +-
 bin/template/duplex-stream-method.tmpl   |    8 +-
 bin/template/response-stream-method.tmpl |    7 +-
 bin/template/rpc-prefix.tmpl             |    4 +
 bin/template/service-map.tmpl            |    2 +-
 changelog.md                             |   26 +
 package-lock.json                        | 1706 +++++++++++++---------
 package.json                             |    4 +-
 readme.md                                |    2 +-
 src/connection-pool.ts                   |   42 +-
 src/lease.ts                             |    2 +
 src/options.ts                           |   37 +-
 src/rpc.ts                               |  107 +-
 src/test/_setup.ts                       |    5 +
 src/test/connection-pool.test.ts         |   20 +-
 src/util.ts                              |   31 +-
 21 files changed, 1334 insertions(+), 748 deletions(-)
 create mode 100644 .vscode/tasks.json
 create mode 100644 bin/template/call-context.tmpl

diff --git a/.vscode/launch.json b/.vscode/launch.json
index 6dcb192..6171af7 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -8,17 +8,13 @@
       "type": "pwa-node",
       "request": "launch",
       "name": "Run Tests",
+      "trace": true,
       "skipFiles": ["<node_internals>/**"],
       "program": "${workspaceFolder}/node_modules/mocha/bin/mocha",
-      "preLaunchTask": "tsc: build - tsconfig.json",
-      "args": [
-        "--timeout",
-        "60000",
-        "--require",
-        "source-map-support/register",
-        "--require",
-        "./lib/test/_setup.js",
-        "\"lib/test/**/*.test.js\""
+      "args": ["--timeout", "10000", "--require", "./lib/test/_setup.js", "lib/test/**/*.test.js"],
+      "outFiles": [
+        "${workspaceFolder}/**/*.js",
+        "!**/node_modules/**"
       ]
     }
   ]
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 25d86e0..c627626 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,14 +1,16 @@
 {
   "typescript.tsdk": "node_modules\\typescript\\lib",
   "editor.formatOnSave": true,
+  "editor.codeActionsOnSave": {
+    "source.organizeImports": true
+  },
   "editor.defaultFormatter": "esbenp.prettier-vscode",
   "search.exclude": {
     "**/lib": true,
     "**/.nyc_output": true,
-    "**/docs": true,
+    "**/docs": true
   },
   "files.exclude": {
-    "**/.nyc_output": true,
-  },
-  "debug.node.autoAttach": "off"
+    "**/.nyc_output": true
+  }
 }
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..32a6e4c
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,15 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "typescript",
+			"tsconfig": "tsconfig.json",
+			"option": "watch",
+			"problemMatcher": [
+				"$tsc-watch"
+			],
+			"group": "build",
+			"label": "tsc: watch - tsconfig.json"
+		}
+	]
+}
\ No newline at end of file
diff --git a/bin/generate-methods.js b/bin/generate-methods.js
index 70acd6a..4db3539 100644
--- a/bin/generate-methods.js
+++ b/bin/generate-methods.js
@@ -13,6 +13,7 @@
  * create the output ourselves since it's pretty simple (~100 lines of code).
  */
 
+const prettier = require('prettier');
 const pbjs = require('protobufjs');
 const fs = require('fs');
 const _ = require('lodash');
@@ -66,14 +67,26 @@ class MessageCollection {
 
 const messages = new MessageCollection();
 
+let result = '';
+
 function emit(string) {
   if (string) {
-    process.stdout.write(string.replace(/\n\n+/g, '\n\n'));
+    result += string;
   }
 
   return emit;
 }
 
+function writeOut() {
+  fs.writeFileSync(
+    `${__dirname}/../src/rpc.ts`,
+    prettier.format(result, {
+      ...require('../package.json').prettier,
+      parser: 'typescript',
+    }),
+  );
+}
+
 function template(name, params) {
   if (!templates[name]) {
     templates[name] = _.template(fs.readFileSync(`${__dirname}/template/${name}.tmpl`, 'utf8'));
@@ -89,7 +102,7 @@ function template(name, params) {
   emit(
     templates[name](params)
       .replace(/^\-\- *\n/gm, '')
-      .replace(/^\-\-/gm, '')
+      .replace(/^\-\-/gm, ''),
   );
 }
 
@@ -169,7 +182,7 @@ function getCommentPrefixing(substring, from = 0, indentation = 1) {
 }
 
 function generateMethodCalls(node, name) {
-  services[name] = `${name}Client`;
+  const service = (services[name] = { cls: `${name}Client`, methods: new Map() });
   template('class-header', { name });
 
   _.forOwn(node.methods, (method, mname) => {
@@ -183,8 +196,12 @@ function generateMethodCalls(node, name) {
       res,
       responseTsType: res.empty ? 'void' : formatType(method.responseType),
       service: name,
+      responseStream: method.responseStream,
+      requestStream: method.requestStream,
     };
 
+    service.methods.set(method, params);
+
     if (method.responseStream && !method.requestStream) {
       template('response-stream-method', params);
     } else if (method.responseStream && method.requestStream) {
@@ -199,6 +216,18 @@ function generateMethodCalls(node, name) {
   emit('}\n\n');
 }
 
+function generateCallContext() {
+  emit('export type CallContext = \n');
+
+  for (const service of Object.values(services)) {
+    for (const params of service.methods.values()) {
+      template('call-context', params);
+    }
+  }
+
+  emit(';\n');
+}
+
 function generateInterface(node, name) {
   const message = messages.find(name);
   template('interface', { name, node, message });
@@ -276,6 +305,7 @@ function codeGen(ast) {
   });
 
   template('service-map', { services });
+  generateCallContext();
 }
 
 new pbjs.Root()
@@ -284,5 +314,6 @@ new pbjs.Root()
     prepareForGeneration(ast.nested);
     template('rpc-prefix');
     codeGen(ast.nested);
+    writeOut();
   })
   .catch(err => console.error(err.stack));
diff --git a/bin/template/call-context.tmpl b/bin/template/call-context.tmpl
new file mode 100644
index 0000000..f1585f9
--- /dev/null
+++ b/bin/template/call-context.tmpl
@@ -0,0 +1 @@
+| { service: '<%= service %>', method: '<%= _.lowerFirst(name) %>', isStream: <%= !!(responseStream || requestStream) %>, <%= req.empty || requestStream ? '' : `params: ${requestTsType}` %> }
diff --git a/bin/template/class-header.tmpl b/bin/template/class-header.tmpl
index a49de35..f825370 100644
--- a/bin/template/class-header.tmpl
+++ b/bin/template/class-header.tmpl
@@ -1,2 +1,2 @@
 export class <%= name %>Client {
-  constructor(private client: ICallable<unknown>) {}
+  constructor(private readonly client: ICallable<unknown>) {}
diff --git a/bin/template/duplex-stream-method.tmpl b/bin/template/duplex-stream-method.tmpl
index 214b422..09a4ae6 100644
--- a/bin/template/duplex-stream-method.tmpl
+++ b/bin/template/duplex-stream-method.tmpl
@@ -2,7 +2,13 @@
   public <%= _.lowerFirst(name) %>(options?: grpc.CallOptions): Promise<IDuplexStream<<%= requestTsType %>, <%= responseTsType %>>> {
     return this.client.withConnection('<%= service %>', ({ resource, client, metadata }) => {
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
-        const stream = (<any> client).<%= _.lowerFirst(name) %>(metadata, options);
+        const resolved = resolveCallOptions(options, this.client.callOptionsFactory, {
+          service: '<%= service %>',
+          method: '<%= _.lowerFirst(name) %>',
+          isStream: true,
+        });
+
+        const stream = (<any> client).<%= _.lowerFirst(name) %>(metadata, resolved);
         stream.on('error', (err: Error) => stream.writable && this.client.markFailed(resource, err));
         return stream;
       });
diff --git a/bin/template/response-stream-method.tmpl b/bin/template/response-stream-method.tmpl
index 294692b..19e6d0e 100644
--- a/bin/template/response-stream-method.tmpl
+++ b/bin/template/response-stream-method.tmpl
@@ -1,8 +1,13 @@
 --<%= getCommentPrefixing(`rpc ${name}(`) %>
   public <%= _.lowerFirst(name) %>(<%= req.empty ? '' : `req: ${requestTsType}, ` %>options?: grpc.CallOptions): Promise<IResponseStream<<%= responseTsType %>>> {
     return this.client.withConnection('<%= service %>', ({ resource, client, metadata }) => {
+        const resolved = resolveCallOptions(options, this.client.callOptionsFactory, {
+          service: '<%= service %>',
+          method: '<%= _.lowerFirst(name) %>', <%= req.empty ? '' : 'params: req, ' %> isStream: true,
+        });
+
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
-        const stream = (<any> client).<%= _.lowerFirst(name) %>(metadata, options, <%= req.empty ? '{}' : 'req' %>);
+        const stream = (<any> client).<%= _.lowerFirst(name) %>(metadata, resolved, <%= req.empty ? '{}' : 'req' %>);
         stream.on('error', (err: Error) => this.client.markFailed(resource, err));
         return stream;
       });
diff --git a/bin/template/rpc-prefix.tmpl b/bin/template/rpc-prefix.tmpl
index 3497529..f948502 100644
--- a/bin/template/rpc-prefix.tmpl
+++ b/bin/template/rpc-prefix.tmpl
@@ -7,6 +7,8 @@
 /* eslint-disable @typescript-eslint/no-empty-interface */
 
 import * as grpc from '@grpc/grpc-js';
+import type { CallOptionsFactory } from './options';
+import { resolveCallOptions } from './util';
 
 export interface ICallable<T> {
   exec<T>(
@@ -22,6 +24,8 @@ export interface ICallable<T> {
   ): Promise<R>;
 
   markFailed(resource: T, error: Error): void;
+
+  readonly callOptionsFactory: CallOptionsFactory | undefined;
 }
 
 export interface IResponseStream<T> {
diff --git a/bin/template/service-map.tmpl b/bin/template/service-map.tmpl
index 9ccdc2d..65e1f05 100644
--- a/bin/template/service-map.tmpl
+++ b/bin/template/service-map.tmpl
@@ -1,5 +1,5 @@
 export const Services = {
 --<% _.forOwn(services, (clientName, serviceName) => { %>
-  <%= serviceName %>: <%= clientName %>,
+  <%= serviceName %>: <%= clientName.cls %>,
 --<% }) %>
 };
diff --git a/changelog.md b/changelog.md
index a47d895..628c60b 100644
--- a/changelog.md
+++ b/changelog.md
@@ -2,6 +2,32 @@
 
 - **fix:** update version of cockatiel to fix incompatible TypeScript types (see [#128](https://github.com/microsoft/etcd3/issues/128))
 - **fix:** don't include the deadline in inherited lease call options (see [#131](https://github.com/microsoft/etcd3/issues/131))
+- **feat:** allow passing a set of default CallOptions in new Etcd3() (see [#133](https://github.com/microsoft/etcd3/issues/133))
+
+  When constructing `Etcd3`, you can now pass `defaultCallOptions`. This can be an object, or a function which will be called for each etcd method call and should return an object. As a function, it will be called with a context object, which looks like:
+
+  ```js
+  {
+    service: 'KV',   // etcd service name
+    method: 'range', // etcd method name
+    isStream: false, // whether the call create a stream
+    params: { ... }, // arguments given to the call
+  }
+  ```
+
+  For example, this will set a 10 second timeout on all calls which are not streams:
+
+  ```js
+  const etcd3 = new Etcd3({
+    defaultCallOptions: context => context.isStream ? {} : Date.now() + 10000,
+  });
+  ```
+
+  The default options are shallow merged with any call-specific options. For example this will always result in a 5 second timeout, regardless of what the `defaultCallOptions` contains:
+
+  ```js
+  etcd3.get('foo').options({ deadline: Date.now() + 5000 })
+  ```
 
 ## 1.0.1 2020-06-21
 
diff --git a/package-lock.json b/package-lock.json
index ba85864..b107d79 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,12 +5,12 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
-      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "^7.0.0"
+        "@babel/highlight": "^7.10.4"
       }
     },
     "@babel/core": {
@@ -191,14 +191,22 @@
       }
     },
     "@babel/highlight": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
-      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
       "dev": true,
       "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
         "chalk": "^2.0.0",
-        "esutils": "^2.0.2",
         "js-tokens": "^4.0.0"
+      },
+      "dependencies": {
+        "@babel/helper-validator-identifier": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+          "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
+          "dev": true
+        }
       }
     },
     "@babel/parser": {
@@ -299,25 +307,212 @@
         "to-fast-properties": "^2.0.0"
       }
     },
-    "@grpc/grpc-js": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/@grpc/grpc-js/-/grpc-js-1.0.5.tgz",
-      "integrity": "sha512-Hm+xOiqAhcpT9RYM8lc15dbQD7aQurM7ZU8ulmulepiPlN7iwBXXwP3vSBUimoFoApRqz7pSIisXU8pZaCB4og==",
+    "@eslint/eslintrc": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.1.3.tgz",
+      "integrity": "sha512-4YVwPkANLeNtRjMekzux1ci8hIaH5eGKktGqR0d3LWsKNn5B2X/1Z6Trxy7jQXl9EBGE6Yj02O+t09FMeRllaA==",
+      "dev": true,
       "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "lodash": "^4.17.19",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
+        }
+      }
+    },
+    "@grpc/grpc-js": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/@grpc/grpc-js/-/grpc-js-1.1.7.tgz",
+      "integrity": "sha512-EuxMstI0u778dp0nk6Fe3gHXYPeV6FYsWOe0/QFwxv1NQ6bc5Wl/0Yxa4xl9uBlKElL6AIxuASmSfu7KEJhqiw==",
+      "requires": {
+        "@grpc/proto-loader": "^0.6.0-pre14",
+        "@types/node": "^12.12.47",
+        "google-auth-library": "^6.0.0",
         "semver": "^6.2.0"
       },
       "dependencies": {
+        "@grpc/proto-loader": {
+          "version": "0.6.0-pre9",
+          "resolved": "https://registry.npmjs.org/@grpc/proto-loader/-/proto-loader-0.6.0-pre9.tgz",
+          "integrity": "sha512-oM+LjpEjNzW5pNJjt4/hq1HYayNeQT+eGrOPABJnYHv7TyNPDNzkQ76rDYZF86X5swJOa4EujEMzQ9iiTdPgww==",
+          "requires": {
+            "@types/long": "^4.0.1",
+            "lodash.camelcase": "^4.3.0",
+            "long": "^4.0.0",
+            "protobufjs": "^6.9.0",
+            "yargs": "^15.3.1"
+          }
+        },
+        "@types/node": {
+          "version": "12.12.62",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.62.tgz",
+          "integrity": "sha512-qAfo81CsD7yQIM9mVyh6B/U47li5g7cfpVQEDMfQeF8pSZVwzbhwU3crc0qG4DmpsebpJPR49AKOExQyJ05Cpg=="
+        },
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
+        },
+        "ansi-styles": {
+          "version": "4.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
+          "integrity": "sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==",
+          "requires": {
+            "@types/color-name": "^1.1.1",
+            "color-convert": "^2.0.1"
+          }
+        },
+        "cliui": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
+          "integrity": "sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==",
+          "requires": {
+            "string-width": "^4.2.0",
+            "strip-ansi": "^6.0.0",
+            "wrap-ansi": "^6.2.0"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+        },
+        "emoji-regex": {
+          "version": "8.0.0",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+          "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A=="
+        },
+        "find-up": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+          "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+          "requires": {
+            "locate-path": "^5.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "locate-path": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+          "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+          "requires": {
+            "p-locate": "^4.1.0"
+          }
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@@ -3714,21 +3990,6 @@
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       "dev": true
     },
-    "through": {
-      "version": "2.3.8",
-      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
-      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
-      "dev": true
-    },
-    "tmp": {
-      "version": "0.0.33",
-      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
-      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
-      "dev": true,
-      "requires": {
-        "os-tmpdir": "~1.0.2"
-      }
-    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -3751,9 +4012,9 @@
       "dev": true
     },
     "ts-node": {
-      "version": "8.10.2",
-      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-8.10.2.tgz",
-      "integrity": "sha512-ISJJGgkIpDdBhWVu3jufsWpK3Rzo7bdiIXJjQc0ynKxVOVcg2oIrf2H2cejminGrptVc6q6/uynAHNCuWGbpVA==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-9.0.0.tgz",
+      "integrity": "sha512-/TqB4SnererCDR/vb4S/QvSZvzQMJN8daAslg7MeaiHvD8rDZsSfXmNeNumyZZzMned72Xoq/isQljYSt8Ynfg==",
       "dev": true,
       "requires": {
         "arg": "^4.1.0",
@@ -3769,6 +4030,15 @@
       "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
       "dev": true
     },
+    "tsutils": {
+      "version": "3.17.1",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
+      "integrity": "sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
     "type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -3830,9 +4100,9 @@
       }
     },
     "typescript": {
-      "version": "3.9.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.5.tgz",
-      "integrity": "sha512-hSAifV3k+i6lEoCJ2k6R2Z/rp/H3+8sdmcn5NrS3/3kE7+RyZXm9aqvxWqjEXHAd8b0pShatpcdMTvEdvAJltQ==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
+      "integrity": "sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==",
       "dev": true
     },
     "uglify-js": {
@@ -3873,9 +4143,9 @@
       }
     },
     "uri-js": {
-      "version": "4.2.2",
-      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
-      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz",
+      "integrity": "sha512-B0yRTzYdUCCn9n+F4+Gh4yIDtMQcaJsmYBDsTSG8g/OejKBodLQ2IHfN3bM7jUsRXndopT7OIXWdYqc1fjmV6g==",
       "dev": true,
       "requires": {
         "punycode": "^2.1.0"
@@ -3915,8 +4185,7 @@
     "which-module": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
     },
     "wide-align": {
       "version": "1.1.3",
@@ -4013,8 +4282,12 @@
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-      "dev": true
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
+    },
+    "yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
     },
     "yargs": {
       "version": "13.3.2",
@@ -4045,14 +4318,47 @@
       }
     },
     "yargs-unparser": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
-      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.1.tgz",
+      "integrity": "sha512-qZV14lK9MWsGCmcr7u5oXGH0dbGqZAIxTDrWXZDo5zUr6b6iUmelNKO6x6R1dQT24AH3LgRxJpr8meWy2unolA==",
       "dev": true,
       "requires": {
+        "camelcase": "^5.3.1",
+        "decamelize": "^1.2.0",
         "flat": "^4.1.0",
-        "lodash": "^4.17.15",
-        "yargs": "^13.3.0"
+        "is-plain-obj": "^1.1.0",
+        "yargs": "^14.2.3"
+      },
+      "dependencies": {
+        "yargs": {
+          "version": "14.2.3",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
+          "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
+          "dev": true,
+          "requires": {
+            "cliui": "^5.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^2.0.1",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^2.0.0",
+            "set-blocking": "^2.0.0",
+            "string-width": "^3.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^4.0.0",
+            "yargs-parser": "^15.0.1"
+          }
+        },
+        "yargs-parser": {
+          "version": "15.0.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
+          "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
       }
     },
     "yn": {
diff --git a/package.json b/package.json
index 22067fe..121ba58 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "test:cover": "nyc mocha",
     "test:lint": "eslint \"src/**/*.ts\"",
     "watch": "tsc --watch",
-    "build:proto": "node ./bin/update-proto ./proto && node bin/generate-methods.js ./proto/rpc.proto > src/rpc.ts && npm run fmt",
+    "build:proto": "node ./bin/update-proto ./proto && node bin/generate-methods.js",
     "build:doc": "rimraf docs && typedoc --theme minimal --mode library --exclude \"src/test/*\" --excludePrivate --stripInternal --out ./docs ./src/index.ts && node bin/tame-typedoc",
     "build:ts": "tsc",
     "fmt": "prettier --write \"src/**/*.{ts,js}\" && npm run -s test:lint -- --fix",
@@ -68,7 +68,7 @@
     "rimraf": "^3.0.2",
     "sinon": "^9.0.3",
     "ts-node": "^9.0.0",
-    "typedoc": "^0.19.1",
+    "typedoc": " 0.17.0-3",
     "typescript": "^4.0.3"
   },
   "dependencies": {
diff --git a/readme.md b/readme.md
index 5b7f1e4..5a92741 100644
--- a/readme.md
+++ b/readme.md
@@ -1,6 +1,6 @@
 # etcd3 [![Run Tests](https://github.com/microsoft/etcd3/workflows/Run%20Tests/badge.svg)](https://github.com/microsoft/etcd3/actions?query=workflow%3A%22Run+Tests%22)
 
-etcd3 aims to be (with its first stable release) a high-quality, production-ready client for the Protocol Buffer-based etcdv3 API. It includes:
+etcd3 aims is a high-quality, production-ready client for the Protocol Buffer-based etcdv3 API. It includes:
 
 - [load balancing](https://microsoft.github.io/etcd3/interfaces/ioptions.html)
 - [fault handling and reconnections](https://microsoft.github.io/etcd3/interfaces/ioptions.html#faulthandling)
diff --git a/src/connection-pool.ts b/src/connection-pool.ts
index 2caf79c..22e1d6f 100644
--- a/src/connection-pool.ts
+++ b/src/connection-pool.ts
@@ -1,26 +1,26 @@
 /*---------------------------------------------------------
  * Copyright (C) Microsoft Corporation. All rights reserved.
  *--------------------------------------------------------*/
-import { loadSync } from '@grpc/proto-loader';
 import * as grpc from '@grpc/grpc-js';
 import { ChannelOptions } from '@grpc/grpc-js/build/src/channel-options';
+import { loadSync } from '@grpc/proto-loader';
 import {
-  isBrokenCircuitError,
-  Policy,
-  IPolicy,
   ConsecutiveBreaker,
   IDefaultPolicyContext,
+  IPolicy,
+  isBrokenCircuitError,
+  Policy,
 } from 'cockatiel';
-
 import {
   castGrpcError,
-  EtcdInvalidAuthTokenError,
-  ClientRuntimeError,
   ClientClosedError,
+  ClientRuntimeError,
+  EtcdInvalidAuthTokenError,
   isRecoverableError,
 } from './errors';
 import { IOptions } from './options';
-import { ICallable, Services } from './rpc';
+import { CallContext, ICallable, Services } from './rpc';
+import { resolveCallOptions } from './util';
 
 const packageDefinition = loadSync(`${__dirname}/../proto/rpc.proto`, {
   keepCase: true,
@@ -108,11 +108,22 @@ class Authenticator {
 
       const meta = new grpc.Metadata();
       const host = removeProtocolPrefix(hosts[index]);
+      const context: CallContext = {
+        method: 'authenticate',
+        params: { name: auth.username, password: auth.password },
+        service: 'Auth',
+        isStream: false,
+      };
+
       return this.getCredentialsFromHost(
         host,
         auth.username,
         auth.password,
-        auth.callOptions,
+        resolveCallOptions(
+          resolveCallOptions(undefined, auth.callOptions, context),
+          resolveCallOptions(undefined, this.options.defaultCallOptions, context),
+          context,
+        ),
         this.credentials,
       )
         .then(token => {
@@ -199,7 +210,7 @@ export class Host {
         // workaround: https://github.com/grpc/grpc-node/issues/1487
         const state = service.getChannel().getConnectivityState(false);
         if (state === grpc.connectivityState.CONNECTING) {
-          service.waitForReady(Date.now() + 10_0000, () => service.close());
+          service.waitForReady(Date.now() + 10_00, () => service.close());
         } else {
           service.close();
         }
@@ -230,6 +241,8 @@ export class ConnectionPool implements ICallable<Host> {
    */
   public static deterministicOrder = false;
 
+  public readonly callOptionsFactory = this.options.defaultCallOptions;
+
   private readonly hosts: Host[];
   private readonly globalPolicy: IPolicy<IDefaultPolicyContext> =
     this.options.faultHandling?.global ?? Policy.handleWhen(isRecoverableError).retry().attempts(3);
@@ -295,8 +308,15 @@ export class ConnectionPool implements ICallable<Host> {
         this.withConnection(
           serviceName,
           async ({ client, metadata }) => {
+            const resolvedOpts = resolveCallOptions(options, this.callOptionsFactory, {
+              service: serviceName,
+              method,
+              params: payload,
+              isStream: false,
+            } as CallContext);
+
             try {
-              return await runServiceCall(client, metadata, options, method, payload);
+              return await runServiceCall(client, metadata, resolvedOpts, method, payload);
             } catch (err) {
               if (err instanceof EtcdInvalidAuthTokenError) {
                 this.authenticator.invalidateMetadata();
diff --git a/src/lease.ts b/src/lease.ts
index 75f68a0..41a52e3 100644
--- a/src/lease.ts
+++ b/src/lease.ts
@@ -27,6 +27,8 @@ function leaseExpired(lease: RPC.ILeaseKeepAliveResponse) {
  * put requests before executing them.
  */
 class LeaseClientWrapper implements RPC.ICallable<Host> {
+  public readonly callOptionsFactory = this.pool.callOptionsFactory;
+
   constructor(
     private pool: ConnectionPool,
     private readonly lease: {
diff --git a/src/options.ts b/src/options.ts
index 788b523..f915c50 100644
--- a/src/options.ts
+++ b/src/options.ts
@@ -1,9 +1,13 @@
 /*---------------------------------------------------------
  * Copyright (C) Microsoft Corporation. All rights reserved.
  *--------------------------------------------------------*/
+
 import { ChannelOptions } from '@grpc/grpc-js/build/src/channel-options';
 import { CallOptions } from '@grpc/grpc-js';
 import { IPolicy, IBackoff, IDefaultPolicyContext } from 'cockatiel';
+import { CallContext } from './rpc';
+
+export type CallOptionsFactory = CallOptions | ((context: CallContext) => CallOptions);
 
 /**
  * IOptions are passed into the client constructor to configure how the client
@@ -60,9 +64,40 @@ export interface IOptions {
     /**
      * Call options to use for the password-to-token exchange.
      */
-    callOptions?: CallOptions;
+    callOptions?: CallOptionsFactory;
   };
 
+  /**
+   * Default call options used for all requests. This can be an object, or a
+   * function which will be called for each etcd method call.  As a function,
+   * it will be called with a context object, which looks like:
+   * ```js
+   * {
+   *   service: 'KV',   // etcd service name
+   *   method: 'range', // etcd method name
+   *   isStream: false, // whether the call create a stream
+   *   params: { ... }, // arguments given to the call
+   * }
+   * ```
+   *
+   * For example, this will set a 10 second timeout on all calls which are not streams:
+   *
+   * ```js
+   * const etcd3 = new Etcd3({
+   *   defaultCallOptions: context => context.isStream ? {} : Date.now() + 10000,
+   * });
+   * ```
+   *
+   * The default options are shallow merged with any call-specific options.
+   * For example this will always result in a 5 second timeout, regardless of
+   * what the `defaultCallOptions` contains:
+   *
+   * ```js
+   * etcd3.get('foo').options({ deadline: Date.now() + 5000 })
+   * ```
+   */
+  defaultCallOptions?: CallOptionsFactory;
+
   /**
    * A list of hosts to connect to. Hosts should include the `https?://` prefix.
    */
diff --git a/src/rpc.ts b/src/rpc.ts
index b8c678b..bf45fbe 100644
--- a/src/rpc.ts
+++ b/src/rpc.ts
@@ -7,6 +7,8 @@
 /* eslint-disable @typescript-eslint/no-empty-interface */
 
 import * as grpc from '@grpc/grpc-js';
+import type { CallOptionsFactory } from './options';
+import { resolveCallOptions } from './util';
 
 export interface ICallable<T> {
   exec<T>(
@@ -22,6 +24,8 @@ export interface ICallable<T> {
   ): Promise<R>;
 
   markFailed(resource: T, error: Error): void;
+
+  readonly callOptionsFactory: CallOptionsFactory | undefined;
 }
 
 export interface IResponseStream<T> {
@@ -39,7 +43,7 @@ export interface IRequestStream<T> {
 
 export interface IDuplexStream<T, R> extends IRequestStream<T>, IResponseStream<R> {}
 export class KVClient {
-  constructor(private client: ICallable<unknown>) {}
+  constructor(private readonly client: ICallable<unknown>) {}
   /**
    * Range gets the keys in the range from the key-value store.
    */
@@ -88,7 +92,7 @@ export class KVClient {
 }
 
 export class WatchClient {
-  constructor(private client: ICallable<unknown>) {}
+  constructor(private readonly client: ICallable<unknown>) {}
   /**
    * Watch watches for events happening or that have happened. Both input and output
    * are streams; the input stream is for creating and canceling watchers and the output
@@ -99,7 +103,13 @@ export class WatchClient {
   public watch(options?: grpc.CallOptions): Promise<IDuplexStream<IWatchRequest, IWatchResponse>> {
     return this.client.withConnection('Watch', ({ resource, client, metadata }) => {
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      const stream = (<any>client).watch(metadata, options);
+      const resolved = resolveCallOptions(options, this.client.callOptionsFactory, {
+        service: 'Watch',
+        method: 'watch',
+        isStream: true,
+      });
+
+      const stream = (<any>client).watch(metadata, resolved);
       stream.on('error', (err: Error) => stream.writable && this.client.markFailed(resource, err));
       return stream;
     });
@@ -107,7 +117,7 @@ export class WatchClient {
 }
 
 export class LeaseClient {
-  constructor(private client: ICallable<unknown>) {}
+  constructor(private readonly client: ICallable<unknown>) {}
   /**
    * LeaseGrant creates a lease which expires if the server does not receive a keepAlive
    * within a given time to live period. All keys attached to the lease will be expired and
@@ -137,7 +147,13 @@ export class LeaseClient {
   ): Promise<IDuplexStream<ILeaseKeepAliveRequest, ILeaseKeepAliveResponse>> {
     return this.client.withConnection('Lease', ({ resource, client, metadata }) => {
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      const stream = (<any>client).leaseKeepAlive(metadata, options);
+      const resolved = resolveCallOptions(options, this.client.callOptionsFactory, {
+        service: 'Lease',
+        method: 'leaseKeepAlive',
+        isStream: true,
+      });
+
+      const stream = (<any>client).leaseKeepAlive(metadata, resolved);
       stream.on('error', (err: Error) => stream.writable && this.client.markFailed(resource, err));
       return stream;
     });
@@ -160,7 +176,7 @@ export class LeaseClient {
 }
 
 export class ClusterClient {
-  constructor(private client: ICallable<unknown>) {}
+  constructor(private readonly client: ICallable<unknown>) {}
   /**
    * MemberAdd adds a member into the cluster.
    */
@@ -209,7 +225,7 @@ export class ClusterClient {
 }
 
 export class MaintenanceClient {
-  constructor(private client: ICallable<unknown>) {}
+  constructor(private readonly client: ICallable<unknown>) {}
   /**
    * Alarm activates, deactivates, and queries alarms regarding cluster health.
    */
@@ -251,8 +267,14 @@ export class MaintenanceClient {
    */
   public snapshot(options?: grpc.CallOptions): Promise<IResponseStream<ISnapshotResponse>> {
     return this.client.withConnection('Maintenance', ({ resource, client, metadata }) => {
+      const resolved = resolveCallOptions(options, this.client.callOptionsFactory, {
+        service: 'Maintenance',
+        method: 'snapshot',
+        isStream: true,
+      });
+
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      const stream = (<any>client).snapshot(metadata, options, {});
+      const stream = (<any>client).snapshot(metadata, resolved, {});
       stream.on('error', (err: Error) => this.client.markFailed(resource, err));
       return stream;
     });
@@ -278,7 +300,7 @@ export class MaintenanceClient {
 }
 
 export class AuthClient {
-  constructor(private client: ICallable<unknown>) {}
+  constructor(private readonly client: ICallable<unknown>) {}
   /**
    * AuthEnable enables authentication.
    */
@@ -1405,3 +1427,70 @@ export const Services = {
   Maintenance: MaintenanceClient,
   Auth: AuthClient,
 };
+export type CallContext =
+  | { service: 'KV'; method: 'range'; isStream: false; params: IRangeRequest }
+  | { service: 'KV'; method: 'put'; isStream: false; params: IPutRequest }
+  | { service: 'KV'; method: 'deleteRange'; isStream: false; params: IDeleteRangeRequest }
+  | { service: 'KV'; method: 'txn'; isStream: false; params: ITxnRequest }
+  | { service: 'KV'; method: 'compact'; isStream: false; params: ICompactionRequest }
+  | { service: 'Watch'; method: 'watch'; isStream: true }
+  | { service: 'Lease'; method: 'leaseGrant'; isStream: false; params: ILeaseGrantRequest }
+  | { service: 'Lease'; method: 'leaseRevoke'; isStream: false; params: ILeaseRevokeRequest }
+  | { service: 'Lease'; method: 'leaseKeepAlive'; isStream: true }
+  | {
+      service: 'Lease';
+      method: 'leaseTimeToLive';
+      isStream: false;
+      params: ILeaseTimeToLiveRequest;
+    }
+  | { service: 'Lease'; method: 'leaseLeases'; isStream: false }
+  | { service: 'Cluster'; method: 'memberAdd'; isStream: false; params: IMemberAddRequest }
+  | { service: 'Cluster'; method: 'memberRemove'; isStream: false; params: IMemberRemoveRequest }
+  | { service: 'Cluster'; method: 'memberUpdate'; isStream: false; params: IMemberUpdateRequest }
+  | { service: 'Cluster'; method: 'memberList'; isStream: false; params: IMemberListRequest }
+  | { service: 'Cluster'; method: 'memberPromote'; isStream: false; params: IMemberPromoteRequest }
+  | { service: 'Maintenance'; method: 'alarm'; isStream: false; params: IAlarmRequest }
+  | { service: 'Maintenance'; method: 'status'; isStream: false }
+  | { service: 'Maintenance'; method: 'defragment'; isStream: false }
+  | { service: 'Maintenance'; method: 'hash'; isStream: false }
+  | { service: 'Maintenance'; method: 'hashKV'; isStream: false; params: IHashKVRequest }
+  | { service: 'Maintenance'; method: 'snapshot'; isStream: true }
+  | { service: 'Maintenance'; method: 'moveLeader'; isStream: false; params: IMoveLeaderRequest }
+  | { service: 'Maintenance'; method: 'downgrade'; isStream: false; params: IDowngradeRequest }
+  | { service: 'Auth'; method: 'authEnable'; isStream: false }
+  | { service: 'Auth'; method: 'authDisable'; isStream: false }
+  | { service: 'Auth'; method: 'authStatus'; isStream: false }
+  | { service: 'Auth'; method: 'authenticate'; isStream: false; params: IAuthenticateRequest }
+  | { service: 'Auth'; method: 'userAdd'; isStream: false; params: IAuthUserAddRequest }
+  | { service: 'Auth'; method: 'userGet'; isStream: false; params: IAuthUserGetRequest }
+  | { service: 'Auth'; method: 'userList'; isStream: false }
+  | { service: 'Auth'; method: 'userDelete'; isStream: false; params: IAuthUserDeleteRequest }
+  | {
+      service: 'Auth';
+      method: 'userChangePassword';
+      isStream: false;
+      params: IAuthUserChangePasswordRequest;
+    }
+  | { service: 'Auth'; method: 'userGrantRole'; isStream: false; params: IAuthUserGrantRoleRequest }
+  | {
+      service: 'Auth';
+      method: 'userRevokeRole';
+      isStream: false;
+      params: IAuthUserRevokeRoleRequest;
+    }
+  | { service: 'Auth'; method: 'roleAdd'; isStream: false; params: IAuthRoleAddRequest }
+  | { service: 'Auth'; method: 'roleGet'; isStream: false; params: IAuthRoleGetRequest }
+  | { service: 'Auth'; method: 'roleList'; isStream: false }
+  | { service: 'Auth'; method: 'roleDelete'; isStream: false; params: IAuthRoleDeleteRequest }
+  | {
+      service: 'Auth';
+      method: 'roleGrantPermission';
+      isStream: false;
+      params: IAuthRoleGrantPermissionRequest;
+    }
+  | {
+      service: 'Auth';
+      method: 'roleRevokePermission';
+      isStream: false;
+      params: IAuthRoleRevokePermissionRequest;
+    };
diff --git a/src/test/_setup.ts b/src/test/_setup.ts
index c3126a9..6ba934b 100644
--- a/src/test/_setup.ts
+++ b/src/test/_setup.ts
@@ -1,6 +1,11 @@
 /*---------------------------------------------------------
  * Copyright (C) Microsoft Corporation. All rights reserved.
  *--------------------------------------------------------*/
+
+// Uncomment for verbose GRPC traces:
+// process.env.GRPC_VERBOSITY = 'DEBUG';
+// process.env.GRPC_TRACE = 'all';
+
 import * as chai from 'chai';
 import { ConnectionPool } from '../connection-pool';
 
diff --git a/src/test/connection-pool.test.ts b/src/test/connection-pool.test.ts
index f47c9e0..3a181e3 100644
--- a/src/test/connection-pool.test.ts
+++ b/src/test/connection-pool.test.ts
@@ -2,12 +2,12 @@
  * Copyright (C) Microsoft Corporation. All rights reserved.
  *--------------------------------------------------------*/
 import { expect } from 'chai';
-
+import { Policy } from 'cockatiel';
+import { stub } from 'sinon';
 import { IOptions, KVClient } from '..';
 import { ConnectionPool } from '../connection-pool';
+import { GRPCDeadlineExceededError, GRPCUnavailableError } from '../errors';
 import { getHost, getOptions } from './util';
-import { Policy } from 'cockatiel';
-import { GRPCUnavailableError } from '../errors';
 
 function getOptionsWithBadHost(options: Partial<IOptions> = {}): IOptions {
   return getOptions({
@@ -38,6 +38,20 @@ describe('connection pool', () => {
     await kv.deleteRange({ key });
   });
 
+  it('applies call options', async () => {
+    const optsStub = stub()
+      .onFirstCall()
+      .returns({ deadline: new Date(0) })
+      .onSecondCall()
+      .returns({ deadline: new Date(Date.now() + 30_000) });
+
+    const pool = new ConnectionPool({ ...getOptions(), defaultCallOptions: optsStub });
+
+    const kv = new KVClient(pool);
+    await expect(kv.range({ key })).to.be.rejectedWith(GRPCDeadlineExceededError);
+    expect(await kv.range({ key })).be.ok;
+  });
+
   it('rejects instantiating with a mix of secure and unsecure hosts', () => {
     expect(
       () =>
diff --git a/src/util.ts b/src/util.ts
index 83d536d..0121fb2 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -1,9 +1,12 @@
 /*---------------------------------------------------------
  * Copyright (C) Microsoft Corporation. All rights reserved.
  *--------------------------------------------------------*/
-import { EventEmitter } from 'events';
 
+import { CallOptions } from '@grpc/grpc-js';
+import { EventEmitter } from 'events';
 import { ClientRuntimeError } from './errors';
+import { CallOptionsFactory } from './options';
+import { CallContext, Services } from './rpc';
 
 export const zeroKey = Buffer.from([0]);
 export const emptyKey = Buffer.from([]);
@@ -237,3 +240,29 @@ export abstract class PromiseWrap<T> implements PromiseLike<T> {
    */
   protected abstract createPromise(): Promise<T>;
 }
+
+export interface ICallContext {
+  service: keyof typeof Services;
+  method: string;
+  params: unknown;
+}
+
+/**
+ * Applies the defaultOptions or defaultOptions factory to the given
+ * call-specific options.
+ */
+export const resolveCallOptions = (
+  callOptions: CallOptions | undefined,
+  defaultOptions: undefined | CallOptionsFactory,
+  context: CallContext,
+): CallOptions | undefined => {
+  if (defaultOptions === undefined) {
+    return callOptions;
+  }
+
+  if (typeof defaultOptions === 'function') {
+    defaultOptions = defaultOptions(context);
+  }
+
+  return callOptions ? { ...defaultOptions, ...callOptions } : defaultOptions;
+};