Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
'use strict';
const Aspect = require('./operation').Aspect;
const OperationBase = require('./operation').OperationBase;
const resolveReadPreference = require('../utils').resolveReadPreference;
const ReadConcern = require('../read_concern');
const WriteConcern = require('../write_concern');
const maxWireVersion = require('../core/utils').maxWireVersion;
const commandSupportsReadConcern = require('../core/sessions').commandSupportsReadConcern;
const MongoError = require('../error').MongoError;
const SUPPORTS_WRITE_CONCERN_AND_COLLATION = 5;
class CommandOperationV2 extends OperationBase {
constructor(parent, options, operationOptions) {
super(options);
this.ns = parent.s.namespace.withCollection('$cmd');
this.readPreference = resolveReadPreference(parent, this.options);
this.readConcern = resolveReadConcern(parent, this.options);
this.writeConcern = resolveWriteConcern(parent, this.options);
this.explain = false;
if (operationOptions && typeof operationOptions.fullResponse === 'boolean') {
this.fullResponse = true;
}
// TODO: A lot of our code depends on having the read preference in the options. This should
// go away, but also requires massive test rewrites.
this.options.readPreference = this.readPreference;
// TODO(NODE-2056): make logger another "inheritable" property
if (parent.s.logger) {
this.logger = parent.s.logger;
} else if (parent.s.db && parent.s.db.logger) {
this.logger = parent.s.db.logger;
}
}
executeCommand(server, cmd, callback) {
// TODO: consider making this a non-enumerable property
this.server = server;
const options = this.options;
const serverWireVersion = maxWireVersion(server);
const inTransaction = this.session && this.session.inTransaction();
if (this.readConcern && commandSupportsReadConcern(cmd) && !inTransaction) {
Object.assign(cmd, { readConcern: this.readConcern });
}
if (options.collation && serverWireVersion < SUPPORTS_WRITE_CONCERN_AND_COLLATION) {
callback(
new MongoError(
`Server ${server.name}, which reports wire version ${serverWireVersion}, does not support collation`
)
);
return;
}
if (serverWireVersion >= SUPPORTS_WRITE_CONCERN_AND_COLLATION) {
if (this.writeConcern && this.hasAspect(Aspect.WRITE_OPERATION)) {
Object.assign(cmd, { writeConcern: this.writeConcern });
}
if (options.collation && typeof options.collation === 'object') {
Object.assign(cmd, { collation: options.collation });
}
}
if (typeof options.maxTimeMS === 'number') {
cmd.maxTimeMS = options.maxTimeMS;
}
if (typeof options.comment === 'string') {
cmd.comment = options.comment;
}
if (this.logger && this.logger.isDebug()) {
this.logger.debug(`executing command ${JSON.stringify(cmd)} against ${this.ns}`);
}
server.command(this.ns.toString(), cmd, this.options, (err, result) => {
if (err) {
callback(err, null);
return;
}
if (this.fullResponse) {
callback(null, result);
return;
}
callback(null, result.result);
});
}
}
function resolveWriteConcern(parent, options) {
return WriteConcern.fromOptions(options) || parent.writeConcern;
}
function resolveReadConcern(parent, options) {
return ReadConcern.fromOptions(options) || parent.readConcern;
}
module.exports = CommandOperationV2;