Added new observability events (#1365)

lib/Transport.js

@@ -268,6 +268,8 @@ class Transport {
       if (!isCompressed) {
         response.setEncoding('utf8')
       }
+
+      this.emit('deserialization', null, result)
       response.on('data', onData)
       response.on('error', onEnd)
       response.on('end', onEnd)
@@ -340,6 +342,7 @@ class Transport {
       }
     }
 
+    this.emit('serialization', null, result)
     const headers = Object.assign({}, this.headers, lowerCaseHeaders(options.headers))
 
     if (options.opaqueId !== undefined) {
@@ -354,6 +357,7 @@ class Transport {
         try {
           params.body = this.serializer.serialize(params.body)
         } catch (err) {
+          this.emit('request', err, result)
           process.nextTick(callback, err, result)
           return transportReturn
         }
@@ -369,6 +373,7 @@ class Transport {
         try {
           params.body = this.serializer.ndserialize(params.bulkBody)
         } catch (err) {
+          this.emit('request', err, result)
           process.nextTick(callback, err, result)
           return transportReturn
         }
@@ -408,6 +413,7 @@ class Transport {
         gzip(params.body, (err, buffer) => {
           /* istanbul ignore next */
           if (err) {
+            this.emit('request', err, result)
             return callback(err, result)
           }
           params.headers['content-encoding'] = compression