Enable engine reporting in Lambda (#1313)

* add disableInterval option to engine reporting

* set engine options for lambda

* lambda: add comment on constructor

* lambda: update readme typo and include callout to use graphql.js

* disableInterval -> sendReportsImmediately

* use sendReportsImmediately correctly and fix compilation

* uses new Header to fix different header combination, fixes #1301

* add apollo-server-env dependency

* fix logic error in engine reporting

packages/apollo-engine-reporting/src/agent.ts

@@ -79,6 +79,8 @@ export interface EngineReportingOptions {
   // 'sendReport()' on other signals if you'd like. Note that 'sendReport()'
   // does not run synchronously so it cannot work usefully in an 'exit' handler.
   handleSignals?: boolean;
+  // Sends the trace report immediately. This options is useful for stateless environments
+  sendReportsImmediately?: boolean;
 
   // XXX Provide a way to set client_name, client_version, client_address,
   // service, and service_version fields. They are currently not revealed in the
@@ -103,6 +105,8 @@ export class EngineReportingAgent<TContext = any> {
   private report!: FullTracesReport;
   private reportSize!: number;
   private reportTimer: any; // timer typing is weird and node-specific
+  private sendReportsImmediately?: boolean;
+  private stopped: boolean = false;
 
   public constructor(options: EngineReportingOptions = {}) {
     this.options = options;
@@ -115,10 +119,13 @@ export class EngineReportingAgent<TContext = any> {
 
     this.resetReport();
 
+    this.sendReportsImmediately = options.sendReportsImmediately;
+    if (!this.sendReportsImmediately) {
       this.reportTimer = setInterval(
         () => this.sendReportAndReportErrors(),
         this.options.reportIntervalMs || 10 * 1000,
       );
+    }
 
     if (this.options.handleSignals !== false) {
       const signals: NodeJS.Signals[] = ['SIGINT', 'SIGTERM'];
@@ -141,7 +148,7 @@ export class EngineReportingAgent<TContext = any> {
 
   public addTrace(signature: string, operationName: string, trace: Trace) {
     // Ignore traces that come in after stop().
-    if (!this.reportTimer) {
+    if (this.stopped) {
       return;
     }
 
@@ -165,6 +172,7 @@ export class EngineReportingAgent<TContext = any> {
 
     // If the buffer gets big (according to our estimate), send.
     if (
+      this.sendReportsImmediately ||
       this.reportSize >=
         (this.options.maxUncompressedReportSize || 4 * 1024 * 1024)
     ) {
@@ -270,6 +278,8 @@ export class EngineReportingAgent<TContext = any> {
       clearInterval(this.reportTimer);
       this.reportTimer = undefined;
     }
+
+    this.stopped = true;
   }
 
   private sendReportAndReportErrors(): Promise<void> {

packages/apollo-server-lambda/README.md

@@ -17,6 +17,8 @@ To deploy the AWS Lambda function we must create a Cloudformation Template and a
 
 #### 1. Write the API handlers
 
+In a file named `graphql.js`, place the following code:
+
 ```js
 const { ApolloServer, gql } = require('apollo-server-lambda');
 
@@ -136,7 +138,7 @@ exports.graphqlHandler = server.createHandler();
 
 ## Modifying the Lambda Response (Enable CORS)
 
-To enable CORS the response HTTP headers need to be modified. To accomplish this use `cors` options.
+To enable CORS the response HTTP headers need to be modified. To accomplish this use the `cors` option.
 
 ```js
 const { ApolloServer, gql } = require('apollo-server-lambda');

packages/apollo-server-lambda/package.json

@@ -32,6 +32,7 @@
   "dependencies": {
     "@apollographql/graphql-playground-html": "^1.6.0",
     "apollo-server-core": "^2.0.0-rc.6",
+    "apollo-server-env": "^2.0.0-rc.6",
     "graphql-tools": "^3.0.4"
   },
   "devDependencies": {

packages/apollo-server-lambda/src/ApolloServer.ts

@@ -1,7 +1,7 @@
 import * as lambda from 'aws-lambda';
 import { ApolloServerBase } from 'apollo-server-core';
 export { GraphQLOptions, GraphQLExtension } from 'apollo-server-core';
-import { GraphQLOptions } from 'apollo-server-core';
+import { GraphQLOptions, Config } from 'apollo-server-core';
 import {
   renderPlaygroundPage,
   RenderPageOptions as PlaygroundRenderPageOptions,
@@ -22,6 +22,19 @@ export interface CreateHandlerOptions {
 }
 
 export class ApolloServer extends ApolloServerBase {
+  // If you feel tempted to add an option to this constructor. Please consider
+  // another place, since the documentation becomes much more complicated when
+  // the constructor is not longer shared between all integration
+  constructor(options: Config) {
+    if (process.env.ENGINE_API_KEY || options.engine) {
+      options.engine = {
+        sendReportsImmediately: true,
+        ...(typeof options.engine !== 'boolean' ? options.engine : {}),
+      };
+    }
+    super(options);
+  }
+
   // This translates the arguments from the middleware into graphQL options It
   // provides typings for the integration specific behavior, ideally this would
   // be propagated with a generic to the super class

packages/apollo-server-lambda/src/lambdaApollo.ts

@@ -4,6 +4,7 @@ import {
   HttpQueryError,
   runHttpQuery,
 } from 'apollo-server-core';
+import { Headers } from 'apollo-server-env';
 
 export interface LambdaGraphQLOptionsFunction {
   (event: lambda.APIGatewayProxyEvent, context: lambda.Context):
@@ -45,7 +46,7 @@ export function graphqlLambda(
       request: {
         url: event.path,
         method: event.httpMethod,
-        headers: event.headers as any,
+        headers: new Headers(event.headers),
       },
     }).then(
       ({ graphqlResponse, responseInit }) => {