Modify functions emulator to invoke RTDB emulator triggers

changelog.txt

@@ -1 +1,4 @@
 * **BREAKING** The CLI no longer supports being run in Node 6 environments.
+* **BREAKING** RTDB Emulator comes up with open rules by default
+* Modify RTDB emulator to publish triggers to the functions emulator
+* Modify functions emulator to invoke RTDB emulator triggers

src/emulator/constants.ts

@@ -13,6 +13,7 @@ const DEFAULT_HOST = "localhost";
 
 export class Constants {
   static SERVICE_FIRESTORE = "firestore.googleapis.com";
+  static SERVICE_REALTIME_DATABASE = "firebaseio.com";
 
   static getDefaultHost(emulator: Emulators): string {
     return DEFAULT_HOST;

src/emulator/controller.ts

@@ -154,17 +154,22 @@ export async function startAll(options: any): Promise<void> {
 
   if (targets.indexOf(Emulators.DATABASE) > -1) {
     const databaseAddr = Constants.getAddress(Emulators.DATABASE, options);
-    const databaseEmulator = new DatabaseEmulator({
-      host: databaseAddr.host,
-      port: databaseAddr.port,
-    });
+    let databaseEmulator;
+    if (targets.indexOf(Emulators.FUNCTIONS) > -1) {
+      const functionsAddr = Constants.getAddress(Emulators.FUNCTIONS, options);
+      databaseEmulator = new DatabaseEmulator({
+        host: databaseAddr.host,
+        port: databaseAddr.port,
+        functions_emulator_host: functionsAddr.host,
+        functions_emulator_port: functionsAddr.port,
+      });
+    } else {
+      databaseEmulator = new DatabaseEmulator({
+        host: databaseAddr.host,
+        port: databaseAddr.port,
+      });
+    }
     await startEmulator(databaseEmulator);
-
-    // TODO: When the database emulator is integrated with the Functions
-    //       emulator, we will need to pass the port in and remove this warning
-    utils.logWarning(
-      `Note: the database emulator is not currently integrated with the functions emulator.`
-    );
   }
 
   if (targets.indexOf(Emulators.HOSTING) > -1) {

src/emulator/databaseEmulator.ts

@@ -5,6 +5,8 @@ import { Constants } from "./constants";
 interface DatabaseEmulatorArgs {
   port?: number;
   host?: string;
+  functions_emulator_port?: number;
+  functions_emulator_host?: string;
 }
 
 export class DatabaseEmulator implements EmulatorInstance {

src/emulator/functionsEmulator.ts

@@ -32,6 +32,14 @@ import { EmulatorLogger, Verbosity } from "./emulatorLogger";
 
 const EVENT_INVOKE = "functions:invoke";
 
+/*
+ * The Realtime Database emulator expects the `path` field in its trigger
+ * definition to be relative to the database root. This regex is used to extract
+ * that path from the `resource` member in the trigger definition used by the
+ * functions emulator.
+ */
+const DATABASE_PATH_PATTERN = new RegExp("^projects/[^/]+/instances/[^/]+/refs(/.*)$");
+
 export interface FunctionsEmulatorArgs {
   port?: number;
   host?: string;
@@ -490,6 +498,9 @@ You can probably fix this by running "npm install ${
             case Constants.SERVICE_FIRESTORE:
               await this.addFirestoreTrigger(this.projectId, definition);
               break;
+            case Constants.SERVICE_REALTIME_DATABASE:
+              await this.addRealtimeDatabaseTrigger(this.projectId, definition);
+              break;
             default:
               EmulatorLogger.log("DEBUG", `Unsupported trigger: ${JSON.stringify(definition)}`);
               EmulatorLogger.log(
@@ -514,6 +525,74 @@ You can probably fix this by running "npm install ${
     return loadTriggers();
   }
 
+  addRealtimeDatabaseTrigger(
+    projectId: string,
+    definition: EmulatedTriggerDefinition
+  ): Promise<any> {
+    const databasePort = EmulatorRegistry.getPort(Emulators.DATABASE);
+    if (!databasePort) {
+      EmulatorLogger.log(
+        "INFO",
+        `Ignoring trigger "${
+          definition.name
+        }" because the Realtime Database emulator is not running.`
+      );
+      return Promise.resolve();
+    }
+    if (definition.eventTrigger === undefined) {
+      EmulatorLogger.log(
+        "WARN",
+        `Event trigger "${definition.name}" has undefined "eventTrigger" member`
+      );
+      return Promise.reject();
+    }
+
+    const result: string[] | null = DATABASE_PATH_PATTERN.exec(definition.eventTrigger.resource);
+    if (result === null || result.length !== 2) {
+      EmulatorLogger.log(
+        "WARN",
+        `Event trigger "${definition.name}" has malformed "resource" member. ` +
+          `${definition.eventTrigger.resource}`
+      );
+      return Promise.reject();
+    }
+
+    const bundle = JSON.stringify([
+      {
+        name: `projects/${projectId}/locations/_/functions/${definition.name}`,
+        path: result[1], // path stored in the first capture group
+        event: definition.eventTrigger.eventType,
+        topic: `projects/${projectId}/topics/${definition.name}`,
+      },
+    ]);
+
+    EmulatorLogger.logLabeled(
+      "BULLET",
+      "functions",
+      `Setting up Realtime Database trigger "${definition.name}"`
+    );
+    logger.debug(`addDatabaseTrigger`, JSON.stringify(bundle));
+    return new Promise((resolve, reject) => {
+      request.put(
+        `http://localhost:${databasePort}/.settings/functionTriggers.json`,
+        {
+          auth: {
+            bearer: "owner",
+          },
+          body: bundle,
+        },
+        (err, res, body) => {
+          if (err) {
+            EmulatorLogger.log("WARN", "Error adding trigger: " + err);
+            reject();
+            return;
+          }
+          resolve();
+        }
+      );
+    });
+  }
+
   addFirestoreTrigger(projectId: string, definition: EmulatedTriggerDefinition): Promise<any> {
     const firestorePort = EmulatorRegistry.getPort(Emulators.FIRESTORE);
     if (!firestorePort) {

src/serve/javaEmulators.ts

@@ -25,10 +25,10 @@ const EmulatorDetails: { [s in JavaEmulators]: JavaEmulatorDetails } = {
     stdout: null,
     cacheDir: CACHE_DIR,
     remoteUrl:
-      "https://storage.googleapis.com/firebase-preview-drop/emulator/firebase-database-emulator-v3.5.0.jar",
-    expectedSize: 17013124,
-    expectedChecksum: "4bc8a67bc2a11d3e7ed226eda1b1a986",
-    localPath: path.join(CACHE_DIR, "firebase-database-emulator-v3.5.0.jar"),
+      "https://storage.googleapis.com/firebase-preview-drop/emulator/firebase-database-emulator-v4.0.0.jar",
+    expectedSize: 17097803,
+    expectedChecksum: "102c8de422db81933a0f29fede5a80a0",
+    localPath: path.join(CACHE_DIR, "firebase-database-emulator-v4.0.0.jar"),
   },
   firestore: {
     name: Emulators.FIRESTORE,