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105 lines
2.9 KiB
105 lines
2.9 KiB
'use strict';
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const CommandOperationV2 = require('./command_v2');
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const MongoError = require('../core').MongoError;
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const maxWireVersion = require('../core/utils').maxWireVersion;
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const ReadPreference = require('../core').ReadPreference;
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const Aspect = require('./operation').Aspect;
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const defineAspects = require('./operation').defineAspects;
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const DB_AGGREGATE_COLLECTION = 1;
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const MIN_WIRE_VERSION_$OUT_READ_CONCERN_SUPPORT = 8;
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class AggregateOperation extends CommandOperationV2 {
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constructor(parent, pipeline, options) {
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super(parent, options, { fullResponse: true });
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this.target =
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parent.s.namespace && parent.s.namespace.collection
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? parent.s.namespace.collection
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: DB_AGGREGATE_COLLECTION;
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this.pipeline = pipeline;
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// determine if we have a write stage, override read preference if so
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this.hasWriteStage = false;
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if (typeof options.out === 'string') {
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this.pipeline = this.pipeline.concat({ $out: options.out });
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this.hasWriteStage = true;
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} else if (pipeline.length > 0) {
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const finalStage = pipeline[pipeline.length - 1];
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if (finalStage.$out || finalStage.$merge) {
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this.hasWriteStage = true;
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}
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}
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if (this.hasWriteStage) {
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this.readPreference = ReadPreference.primary;
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}
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if (this.explain && this.writeConcern) {
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throw new MongoError('"explain" cannot be used on an aggregate call with writeConcern');
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}
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if (options.cursor != null && typeof options.cursor !== 'object') {
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throw new MongoError('cursor options must be an object');
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}
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}
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get canRetryRead() {
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return !this.hasWriteStage;
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}
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addToPipeline(stage) {
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this.pipeline.push(stage);
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}
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execute(server, callback) {
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const options = this.options;
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const serverWireVersion = maxWireVersion(server);
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const command = { aggregate: this.target, pipeline: this.pipeline };
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if (this.hasWriteStage && serverWireVersion < MIN_WIRE_VERSION_$OUT_READ_CONCERN_SUPPORT) {
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this.readConcern = null;
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}
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if (serverWireVersion >= 5) {
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if (this.hasWriteStage && this.writeConcern) {
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Object.assign(command, { writeConcern: this.writeConcern });
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}
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}
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if (options.bypassDocumentValidation === true) {
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command.bypassDocumentValidation = options.bypassDocumentValidation;
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}
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if (typeof options.allowDiskUse === 'boolean') {
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command.allowDiskUse = options.allowDiskUse;
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}
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if (options.hint) {
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command.hint = options.hint;
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}
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if (this.explain) {
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options.full = false;
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}
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command.cursor = options.cursor || {};
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if (options.batchSize && !this.hasWriteStage) {
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command.cursor.batchSize = options.batchSize;
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}
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super.executeCommand(server, command, callback);
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}
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}
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defineAspects(AggregateOperation, [
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Aspect.READ_OPERATION,
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Aspect.RETRYABLE,
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Aspect.EXECUTE_WITH_SELECTION,
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Aspect.EXPLAINABLE
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]);
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module.exports = AggregateOperation;
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