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50 lines
1.5 KiB
50 lines
1.5 KiB
3 years ago
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'use strict';
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const OperationBase = require('./operation').OperationBase;
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const Aspect = require('./operation').Aspect;
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const defineAspects = require('./operation').defineAspects;
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const ReadPreference = require('../core').ReadPreference;
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const maxWireVersion = require('../core/utils').maxWireVersion;
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const MongoError = require('../core/error').MongoError;
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class FindOperation extends OperationBase {
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constructor(collection, ns, command, options) {
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super(options);
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this.ns = ns;
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this.cmd = command;
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this.readPreference = ReadPreference.resolve(collection, this.options);
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}
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execute(server, callback) {
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// copied from `CommandOperationV2`, to be subclassed in the future
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this.server = server;
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// updates readPreference if setReadPreference was called on the cursor
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this.readPreference = ReadPreference.resolve(this, this.options);
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if (typeof this.cmd.allowDiskUse !== 'undefined' && maxWireVersion(server) < 4) {
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callback(new MongoError('The `allowDiskUse` option is not supported on MongoDB < 3.2'));
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return;
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}
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if (this.explain) {
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// We need to manually ensure explain is in the options.
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this.options.explain = this.explain.verbosity;
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}
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// TOOD: use `MongoDBNamespace` through and through
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const cursorState = this.cursorState || {};
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server.query(this.ns.toString(), this.cmd, cursorState, this.options, callback);
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}
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}
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defineAspects(FindOperation, [
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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 = FindOperation;
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