使用 Cloud Functions 扩展 Realtime Database

// The Cloud Functions for Firebase SDK to setup triggers and logging. const {onRequest} = require("firebase-functions/https"); const {onValueCreated} = require("firebase-functions/database"); const {logger} = require("firebase-functions"); // The Firebase Admin SDK to access the Firebase Realtime Database. const admin = require("firebase-admin"); admin.initializeApp();
index.js
 

# The Cloud Functions for Firebase SDK to create Cloud Functions and set up triggers. from firebase_functions import db_fn, https_fn # The Firebase Admin SDK to access the Firebase Realtime Database. from firebase_admin import initialize_app, db app = initialize_app()
main.py
 

// All Realtime Database instances in default function region us-central1 at path "/user/{uid}" // There must be at least one Realtime Database present in us-central1. const onWrittenFunctionDefault = onValueWritten("/user/{uid}", (event) => {  // … }); // Instance named "my-app-db-2", at path "/user/{uid}". // The "my-app-db-2" instance must exist in this region. const OnWrittenFunctionInstance = onValueWritten(  {  ref: "/user/{uid}",  instance: "my-app-db-2"  // This example assumes us-central1, but to set location:  // region: "europe-west1"  },  (event) => {  // …  } ); // Instance with "my-app-db-" prefix, at path "/user/{uid}", where uid ends with @gmail.com. // There must be at least one Realtime Database with "my-app-db-*" prefix in this region. const onWrittenFunctionInstance = onValueWritten(  {  ref: "/user/{uid=*@gmail.com}",  instance: "my-app-db-*"  // This example assumes us-central1, but to set location:  // region: "europe-west1"  },  (event) => {  // …  } );

# All Realtime Database instances in default function region us-central1 at path "/user/{uid}" # There must be at least one Realtime Database present in us-central1. @db_fn.on_value_written(r"/user/{uid}") def onwrittenfunctiondefault(event: db_fn.Event[db_fn.Change]): # ... pass # Instance named "my-app-db-2", at path "/user/{uid}". # The "my-app-db-2" instance must exist in this region. @db_fn.on_value_written( reference=r"/user/{uid}", instance="my-app-db-2", # This example assumes us-central1, but to set location: # region="europe-west1", ) def on_written_function_instance(event: db_fn.Event[db_fn.Change]): # ... pass # Instance with "my-app-db-" prefix, at path "/user/{uid}", where uid ends with @gmail.com. # There must be at least one Realtime Database with "my-app-db-*" prefix in this region. @db_fn.on_value_written( reference=r"/user/{uid=*@gmail.com}", instance="my-app-db-*", # This example assumes us-central1, but to set location: # region="europe-west1", ) def on_written_function_instance(event: db_fn.Event[db_fn.Change]): # ... pass 

// Listens for new messages added to /messages/:pushId/original and creates an // uppercase version of the message to /messages/:pushId/uppercase // for all databases in 'us-central1' exports.makeuppercase = onValueCreated(  "/messages/{pushId}/original",  (event) => {  // Grab the current value of what was written to the Realtime Database.  const original = event.data.val();  logger.log("Uppercasing", event.params.pushId, original);  const uppercase = original.toUpperCase();  // You must return a Promise when performing  // asynchronous tasks inside a function, such as  // writing to the Firebase Realtime Database.  // Setting an "uppercase" sibling in the  // Realtime Database returns a Promise.  return event.data.ref.parent.child("uppercase").set(uppercase);  }, );
index.js
 

@db_fn.on_value_created(reference="/messages/{pushId}/original") def makeuppercase(event: db_fn.Event[Any]) -> None:  """Listens for new messages added to /messages/{pushId}/original and  creates an uppercase version of the message to /messages/{pushId}/uppercase  """ # Grab the value that was written to the Realtime Database. original = event.data if not isinstance(original, str): print(f"Not a string: {event.reference}") return # Use the Admin SDK to set an "uppercase" sibling. print(f"Uppercasing {event.params['pushId']}: {original}") upper = original.upper() parent = db.reference(event.reference).parent if parent is None: print("Message can't be root node.") return parent.child("uppercase").set(upper)
main.py
 

 exports makeUppercase = onValueWritten("/messages/{pushId}/original", (event) => {  // Only edit data when it is first created.  if (event.data.before.exists()) {  return null;  }  // Exit when the data is deleted.  if (!event.data.after.exists()) {  return null;  }  // Grab the current value of what was written to the Realtime Database.  const original = event.data.after.val();  console.log('Uppercasing', event.params.pushId, original);  const uppercase = original.toUpperCase();  // You must return a Promise when performing asynchronous tasks inside a Functions such as  // writing to the Firebase Realtime Database.  // Setting an "uppercase" sibling in the Realtime Database returns a Promise.  return event.data.after.ref.parent.child('uppercase').set(uppercase);  });

@db_fn.on_value_written(reference="/messages/{pushId}/original") def makeuppercase2(event: db_fn.Event[db_fn.Change]) -> None:  """Listens for new messages added to /messages/{pushId}/original and  creates an uppercase version of the message to /messages/{pushId}/uppercase  """ # Only edit data when it is first created. if event.data.before is not None: return # Exit when the data is deleted. if event.data.after is None: return # Grab the value that was written to the Realtime Database. original = event.data.after if not hasattr(original, "upper"): print(f"Not a string: {event.reference}") return # Use the Admin SDK to set an "uppercase" sibling. print(f"Uppercasing {event.params['pushId']}: {original}") upper = original.upper() parent = db.reference(event.reference).parent if parent is None: print("Message can't be root node.") return parent.child("uppercase").set(upper)
main.py