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Viewing file:     collection-group.js (4.77 KB)      -rw-r--r--

"use strict";
/*
 * Copyright 2020 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.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.CollectionGroup = void 0;
const query_partition_1 = require("./query-partition");
const util_1 = require("./util");
const logger_1 = require("./logger");
const query_1 = require("./reference/query");
const query_options_1 = require("./reference/query-options");
const path_1 = require("./path");
const validate_1 = require("./validate");
const types_1 = require("./types");
const order_1 = require("./order");
const trace_util_1 = require("./telemetry/trace-util");
/**
 * A `CollectionGroup` refers to all documents that are contained in a
 * collection or subcollection with a specific collection ID.
 *
 * @class CollectionGroup
 */
class CollectionGroup extends query_1.Query {
    /** @private */
    constructor(firestore, collectionId, converter) {
        super(firestore, query_options_1.QueryOptions.forCollectionGroupQuery(collectionId, converter));
    }
    /**
     * Partitions a query by returning partition cursors that can be used to run
     * the query in parallel. The returned cursors are split points that can be
     * used as starting and end points for individual query invocations.
     *
     * @example
     * ```
     * const query = firestore.collectionGroup('collectionId');
     * for await (const partition of query.getPartitions(42)) {
     *   const partitionedQuery = partition.toQuery();
     *   const querySnapshot = await partitionedQuery.get();
     *   console.log(`Partition contained ${querySnapshot.length} documents`);
     * }
     *
     * ```
     * @param {number} desiredPartitionCount The desired maximum number of
     * partition points. The number must be strictly positive. The actual number
     * of partitions returned may be fewer.
     * @return {AsyncIterable<QueryPartition>} An AsyncIterable of
     * `QueryPartition`s.
     */
    async *getPartitions(desiredPartitionCount) {
        const partitions = [];
        await this._firestore._traceUtil.startActiveSpan(trace_util_1.SPAN_NAME_PARTITION_QUERY, async () => {
            var _a;
            (0, validate_1.validateInteger)('desiredPartitionCount', desiredPartitionCount, {
                minValue: 1,
            });
            const tag = (0, util_1.requestTag)();
            await this.firestore.initializeIfNeeded(tag);
            if (desiredPartitionCount > 1) {
                // Partition queries require explicit ordering by __name__.
                const queryWithDefaultOrder = this.orderBy(path_1.FieldPath.documentId());
                const request = queryWithDefaultOrder.toProto();
                // Since we are always returning an extra partition (with an empty endBefore
                // cursor), we reduce the desired partition count by one.
                request.partitionCount = desiredPartitionCount - 1;
                const stream = await this.firestore.requestStream('partitionQueryStream', 
                /* bidirectional= */ false, request, tag);
                stream.resume();
                for await (const currentCursor of stream) {
                    partitions.push((_a = currentCursor.values) !== null && _a !== void 0 ? _a : []);
                }
            }
            (0, logger_1.logger)('Firestore.getPartitions', tag, 'Received %d partitions', partitions.length);
            // Sort the partitions as they may not be ordered if responses are paged.
            partitions.sort((l, r) => (0, order_1.compareArrays)(l, r));
        });
        for (let i = 0; i < partitions.length; ++i) {
            yield new query_partition_1.QueryPartition(this._firestore, this._queryOptions.collectionId, this._queryOptions.converter, i > 0 ? partitions[i - 1] : undefined, partitions[i]);
        }
        // Return the extra partition with the empty cursor.
        yield new query_partition_1.QueryPartition(this._firestore, this._queryOptions.collectionId, this._queryOptions.converter, partitions.pop(), undefined);
    }
    withConverter(converter) {
        return new CollectionGroup(this.firestore, this._queryOptions.collectionId, converter !== null && converter !== void 0 ? converter : (0, types_1.defaultConverter)());
    }
}
exports.CollectionGroup = CollectionGroup;
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