feat: first setup of lambda handler

Author: kbrandwijk

examples/lambda/.gitignore

@@ -0,0 +1,6 @@
+# package directories
+node_modules
+jspm_packages
+
+# Serverless directories
+.serverless

examples/lambda/handler.js

@@ -0,0 +1,22 @@
+'use strict';
+import { GraphQLServerLambda } from 'graphql-yoga'
+
+const typeDefs = `
+  type Query {
+    hello(name: String): String
+  }
+`
+
+const resolvers = {
+  Query: {
+    hello: (_,{ name }) => `Hello ${name}`
+  }
+}
+
+const server = new GraphQLServerLambda({ 
+  typeDefs,
+  resolvers
+})
+
+exports.server = server.graphqlHandler
+exports.playground = server.playgroundHandler

examples/lambda/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "lambda",
+  "version": "1.0.0",
+  "description": "",
+  "main": "handler.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Kim Brandwijk <kim.brandwijk@gmail.com>",
+  "license": "MIT",
+  "dependencies": {
+    "graphql-yoga": "*"
+  }
+}

examples/lambda/serverless.yml

@@ -0,0 +1,21 @@
+service: yoga-example 
+
+provider:
+  name: aws
+  runtime: nodejs6.10
+
+functions:
+  graphql:
+    handler: handler.server
+    events:
+    - http:
+        path: graphql
+        method: post
+        cors: true
+  playground:
+    handler: handler.playground
+    events:
+    - http:
+        path: playground
+        method: get
+        cors: true

package.json

@@ -39,19 +39,22 @@
     "@types/zen-observable": "^0.5.3",
     "apollo-link": "^1.0.7",
     "apollo-server-express": "^1.3.2",
+    "apollo-server-lambda": "1.3.2",
     "apollo-upload-server": "^4.0.0-alpha.1",
     "body-parser-graphql": "1.0.0",
     "cors": "^2.8.4",
     "express": "^4.16.2",
     "graphql": "^0.12.0",
     "graphql-import": "^0.2.0",
     "graphql-playground-middleware-express": "1.4.3",
+    "graphql-playground-middleware-lambda": "1.3.6",
     "graphql-subscriptions": "^0.5.6",
     "graphql-tools": "^2.16.0",
     "portfinder": "^1.0.13",
     "subscriptions-transport-ws": "^0.9.4"
   },
   "devDependencies": {
+    "@types/aws-lambda": "0.0.26",
     "tslint": "5.8.0",
     "tslint-config-standard": "7.0.0",
     "typescript": "2.6.2"

src/index.ts

@@ -15,6 +15,7 @@ export { PubSub, withFilter } from 'graphql-subscriptions'
 import { Props, Options } from './types'
 
 export { Options }
+export { GraphQLServerLambda } from './lambda'
 
 export class GraphQLServer {
   express: express.Application

src/lambda.ts

@@ -0,0 +1,88 @@
+import { graphqlLambda } from 'apollo-server-lambda'
+import * as fs from 'fs'
+import { GraphQLSchema } from 'graphql'
+import { importSchema } from 'graphql-import'
+import lambdaPlayground from 'graphql-playground-middleware-lambda'
+import { makeExecutableSchema } from 'graphql-tools'
+import * as path from 'path'
+
+import { LambdaOptions, LambdaProps } from './types'
+
+export class GraphQLServerLambda {
+  options: LambdaOptions
+  executableSchema: GraphQLSchema
+
+  // TODO: Get endpoint from a variable?
+  playgroundHandler = lambdaPlayground({ endpoint: '/dev/graphql' })
+
+  protected context: any
+
+  constructor(props: LambdaProps) {
+    const defaultOptions: LambdaOptions = {
+      tracing: { mode: 'http-header' },
+    }
+    this.options = { ...defaultOptions, ...props.options }
+
+    this.context = props.context
+
+    if (props.schema) {
+      this.executableSchema = props.schema
+    } else if (props.typeDefs && props.resolvers) {
+      let { typeDefs, resolvers } = props
+
+      // read from .graphql file if path provided
+      if (typeDefs.endsWith('graphql')) {
+        const schemaPath = path.isAbsolute(typeDefs) ? path.resolve(typeDefs) : path.resolve(typeDefs)
+
+        if (!fs.existsSync(schemaPath)) {
+          throw new Error(`No schema found for path: ${schemaPath}`)
+        }
+
+        typeDefs = importSchema(schemaPath)
+      }
+
+      this.executableSchema = makeExecutableSchema({
+        typeDefs,
+        resolvers,
+      })
+    }
+  }
+
+  graphqlHandler(event, context, callback) {
+    function callbackFilter(error, output) {
+      // eslint-disable-next-line no-param-reassign
+      output.headers['Access-Control-Allow-Origin'] = '*'
+
+      callback(error, output)
+    }
+
+    const tracing = event => {
+      const t = this.options.tracing
+      if (typeof t === 'boolean') {
+        return t
+      } else if (t.mode === 'http-header') {
+        return event.headers['x-apollo-tracing'] !== undefined
+      } else {
+        return t.mode === 'enabled'
+      }
+    }
+
+    const handler = graphqlLambda(async (event, context) => {
+      let apolloContext
+      try {
+        apolloContext =
+          typeof this.context === 'function' ? await this.context({ event, context }) : this.context
+      } catch (e) {
+        console.error(e)
+        throw e
+      }
+
+      return {
+        schema: this.executableSchema,
+        tracing: tracing(event),
+        context: apolloContext,
+      }
+    })
+    return handler(event, context, callbackFilter)
+  }
+}

src/types.ts

@@ -56,3 +56,16 @@ export interface Props {
   context?: Context | ContextCallback
   options?: Options
 }
+
+export interface LambdaProps {
+  typeDefs?: string
+  resolvers?: IResolvers
+  schema?: GraphQLSchema
+  context?: Context | ContextCallback
+  options?: LambdaOptions
+}
+
+export interface LambdaOptions {
+  tracing?: boolean | TracingOptions
+  uploads?: UploadOptions
+}

yarn.lock

@@ -2,6 +2,10 @@
 # yarn lockfile v1
 
 
+"@types/aws-lambda@0.0.26":
+  version "0.0.26"
+  resolved "https://registry.yarnpkg.com/@types/aws-lambda/-/aws-lambda-0.0.26.tgz#e16ae8ea87b63151cb48c6fba3c540282ff38902"
+
 "@types/body-parser@*":
   version "1.16.8"
   resolved "https://registry.yarnpkg.com/@types/body-parser/-/body-parser-1.16.8.tgz#687ec34140624a3bec2b1a8ea9268478ae8f3be3"
@@ -115,6 +119,13 @@ apollo-server-express@^1.3.2:
     apollo-server-core "^1.3.2"
     apollo-server-module-graphiql "^1.3.0"
 
+apollo-server-lambda@1.3.2:
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/apollo-server-lambda/-/apollo-server-lambda-1.3.2.tgz#bcf75f3d7115d11cc9892ad3b17427b3d536df0f"
+  dependencies:
+    apollo-server-core "^1.3.2"
+    apollo-server-module-graphiql "^1.3.0"
+
 apollo-server-module-graphiql@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/apollo-server-module-graphiql/-/apollo-server-module-graphiql-1.3.0.tgz#077bb8c7bf292f6128c6c96d59c2096445b084ef"
@@ -564,7 +575,7 @@ graphql-import@^0.2.0:
     graphql "^0.12.3"
     lodash "^4.17.4"
 
-graphql-playground-html@1.4.2:
+graphql-playground-html@1.4.2, graphql-playground-html@^1.3.6:
   version "1.4.2"
   resolved "https://registry.yarnpkg.com/graphql-playground-html/-/graphql-playground-html-1.4.2.tgz#af97a84ea6cf6ba18e8ff148a6a8b17eef40aa46"
   dependencies:
@@ -579,6 +590,13 @@ graphql-playground-middleware-express@1.4.3:
     graphql-playground-html "1.4.2"
     graphql-playground-middleware "^1.2.1-beta.6"
 
+graphql-playground-middleware-lambda@1.3.6:
+  version "1.3.6"
+  resolved "https://registry.yarnpkg.com/graphql-playground-middleware-lambda/-/graphql-playground-middleware-lambda-1.3.6.tgz#eb7e2a03b180505b076d12592ed63623a9e0f880"
+  dependencies:
+    graphql-playground-html "^1.3.6"
+    graphql-playground-middleware "^1.2.1-beta.6"
+
 graphql-playground-middleware@^1.2.1-beta.6:
   version "1.2.1-beta.6"
   resolved "https://registry.yarnpkg.com/graphql-playground-middleware/-/graphql-playground-middleware-1.2.1-beta.6.tgz#b302bda88d28fae716d127a483659c8e70a18776"