分布式计数器

此扩展程序的运作方式

Use this extension to add a highly scalable counter service to your app. This is ideal for applications that count viral actions or any very high-velocity action such as views, likes, or shares.

Since Cloud Firestore has a limit of one sustained write per second, per document, this extension instead shards your writes across documents in a _counter_shards_ subcollection. Each client only increments their own unique shard while the background workers (provided by this extension) monitor and aggregate these shards into a main document.

Here are some features of this extension:

• Scales from 0 updates per second to a maximum of 10,000 per second.
• Supports an arbitrary number of counters in your app.
• Works offline and provides latency compensation for the main counter.

Note that this extension requires client-side logic to work. We provide a TypeScript client sample implementation and its compiled minified JavaScript . You can use this extension on other platforms if you'd like to develop your own client code based on the provided client sample.

We also provide a Node.js admin sample implementation

Additional setup

Before installing this extension, make sure that you've set up a Cloud Firestore database in your Firebase project.

After installing this extension, you'll need to:

• Update your database security rules .
• Use the provided client sample , the provided Node.js admin sample or your own client code to specify your document path and increment values.

Detailed information for these post-installation tasks are provided after you install this extension.

Billing

To install an extension, your project must be on the Blaze (pay as you go) plan

• You will be charged a small amount (typically around $0.01/month) for the Firebase resources required by this extension (even if it is not used).
• This extension uses other Firebase and Google Cloud Platform services, which have associated charges if you exceed the service’s free tier:
• Cloud Firestore
• Cloud Functions (Node.js 10+ runtime. See FAQs )

npm install -g firebase-tools

firebase ext:install firebase/firestore-counter --local --project=projectId_or_alias

firebase emulators:start

firebase deploy --only extensions --project=projectId_or_alias