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solution-counters.js
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solution-counters.js
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
'use strict';
const {Firestore, FieldValue} = require('@google-cloud/firestore');
async function main() {
// [START firestore_solution_sharded_counter_increment]
function incrementCounter(docRef, numShards) {
const shardId = Math.floor(Math.random() * numShards);
const shardRef = docRef.collection('shards').doc(shardId.toString());
return shardRef.set({count: FieldValue.increment(1)}, {merge: true});
}
// [END firestore_solution_sharded_counter_increment]
// [START firestore_solution_sharded_counter_get]
async function getCount(docRef) {
const querySnapshot = await docRef.collection('shards').get();
const documents = querySnapshot.docs;
let count = 0;
for (const doc of documents) {
count += doc.get('count');
}
return count;
}
// [END firestore_solution_sharded_counter_get]
// [START firestore_data_delete_doc]
async function deleteDocs(docRef) {
const shardsCollectionRef = docRef.collection('shards');
const shardDocs = await shardsCollectionRef.select('id').get();
const promises = [];
shardDocs.forEach(async doc => {
promises.push(shardsCollectionRef.doc(doc.id).delete());
});
return Promise.all(promises);
}
// [END firestore_data_delete_doc]
// Create a new client
const firestore = new Firestore();
const docRef = firestore.doc(
'distributed_counter_samples/distributed_counter'
);
// Clean up documents from potential prior test runs
await deleteDocs(docRef);
const numberOfShards = 10;
// Increase the document count
return incrementCounter(docRef, numberOfShards).then(async () => {
console.log('counter increased');
// Get document count
const count = await getCount(docRef);
console.log(`new count is : ${count}`);
// Delete the document
await deleteDocs(docRef);
console.log('Deleted the document');
});
}
main();