Decorate MainPings and CrashPings with a parse() method

src/main/scala/com/mozilla/telemetry/streaming/ErrorAggregator.scala

@@ -141,37 +141,44 @@ object ErrorAggregator {
     dimensions.build
   }
 
-  private def parseCrashPing(ping: CrashPing): Tuple1[Row] = {
-    // Non-main crashes are already retrieved from main pings
-    if(!ping.isMain()) return Tuple1(null)
+  class ParsableCrashPing(ping: CrashPing) {
+    def parse(): Tuple1[Row] = {
+      // Non-main crashes are already retrieved from main pings
+      if(!ping.isMain()) return Tuple1(null)
 
-    val dimensions = buildDimensions(ping.meta)
-    val stats = new RowBuilder(statsSchema)
-    stats("count") = Some(1)
-    stats("main_crashes") = Some(1)
-    Tuple1(RowBuilder.merge(dimensions, stats.build))
+      val dimensions = buildDimensions(ping.meta)
+      val stats = new RowBuilder(statsSchema)
+      stats("count") = Some(1)
+      stats("main_crashes") = Some(1)
+      Tuple1(RowBuilder.merge(dimensions, stats.build))
+    }
   }
+  implicit def ParsableCrashPingToCrashPing(ping: CrashPing) = new ParsableCrashPing(ping)
 
-  private def parseMainPing(ping: MainPing): Tuple1[Row] = {
-    // If a main ping has no usage hours discard it.
-    val usageHours = ping.usageHours()
-    if (usageHours == 0) return Tuple1(null)
+  class ParsableMainPing(ping: MainPing) {
+    def parse(): Tuple1[Row] = {
+      // If a main ping has no usage hours discard it.
+      val usageHours = ping.usageHours()
+      if (usageHours == 0) return Tuple1(null)
 
-    val dimensions = buildDimensions(ping.meta)
-    val stats = new RowBuilder(statsSchema)
-    stats("count") = Some(1)
-    stats("usage_hours") = Some(usageHours)
-    countHistogramErrorsSchema.fieldNames.foreach(stats_name => {
-      stats(stats_name) = Some(ping.getCountHistogramValue(stats_name))
-    })
-    stats("content_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "content"))
-    stats("gpu_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "gpu"))
-    stats("plugin_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "plugin"))
-    stats("gmplugin_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "gmplugin"))
-    stats("content_shutdown_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_KILL_HARD", "ShutDownKill"))
+      val dimensions = buildDimensions(ping.meta)
+      val stats = new RowBuilder(statsSchema)
+      stats("count") = Some(1)
+      stats("usage_hours") = Some(usageHours)
+      countHistogramErrorsSchema.fieldNames.foreach(stats_name => {
+        stats(stats_name) = Some(ping.getCountHistogramValue(stats_name))
+      })
+      stats("content_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "content"))
+      stats("gpu_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "gpu"))
+      stats("plugin_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "plugin"))
+      stats("gmplugin_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_CRASHES_WITH_DUMP", "gmplugin"))
+      stats("content_shutdown_crashes") = Some(ping.getCountKeyedHistogramValue("SUBPROCESS_KILL_HARD", "ShutDownKill"))
 
-    Tuple1(RowBuilder.merge(dimensions, stats.build))
+      Tuple1(RowBuilder.merge(dimensions, stats.build))
+    }
   }
+  implicit def ParsableCrashPingToMainPing(ping: MainPing) = new ParsableMainPing(ping)
+
   /*
    We can't use an Option[Row] because entire rows cannot be null in Spark SQL. The best we can do is to resort to Tuple1[Row].
    See https://github.com/apache/spark/blob/38b9e69623c14a675b14639e8291f5d29d2a0bc3/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoder.scala#L53
@@ -185,9 +192,9 @@ object ErrorAggregator {
       return Tuple1(null)
     }
     if(docType == "crash") {
-      parseCrashPing(messageToCrashPing(message))
+      messageToCrashPing(message).parse()
     } else {
-      parseMainPing(messageToMainPing(message))
+      messageToMainPing(message).parse()
     }
   }