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transaction.js
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/*!
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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';
var common = require('@google-cloud/common');
var extend = require('extend');
var gax = require('google-gax');
var is = require('is');
var path = require('path');
var protobuf = require('protobufjs');
var through = require('through2');
var util = require('util');
var config = require('./v1/spanner_client_config.json').interfaces[
'google.spanner.v1.Spanner'
];
var codec = require('./codec.js');
var PartialResultStream = require('./partial-result-stream.js');
var TransactionRequest = require('./transaction-request.js');
/**
* The gRPC `UNKNOWN` error code.
*
* @private
*/
var UNKNOWN = 2;
/**
* The gRPC `ABORTED` error code.
*
* @private
*/
var ABORTED = 10;
/**
* Metadata retry info key.
*
* @private
*/
var RETRY_INFO_KEY = 'google.rpc.retryinfo-bin';
/**
* Default timeout for Transactions.
*
* @private
*/
var DEFAULT_TRANSACTION_TIMEOUT = config.methods.Commit.timeout_millis;
var protoFilesRoot = new gax.grpc.GoogleProtoFilesRoot();
protoFilesRoot = protobuf.loadSync(
path.join(__dirname, '..', 'protos', 'google/rpc/error_details.proto'),
protoFilesRoot
);
var RetryInfo = protoFilesRoot.lookup('google.rpc.RetryInfo');
/**
* Read/write transaction options.
*
* @typedef {object} TransactionOptions
* @property {number} [timeout=3600000] Specify a timeout (in milliseconds) for
* the transaction. The transaction will be ran in its entirety, however if
* an abort error is returned the transaction will be retried if the timeout
* has not been met.
* @property {boolean} [readOnly=false] Specifies if the transaction is
* read-only.
* @property {number} [exactStaleness] Executes all reads at the timestamp
* that is `exactStaleness` old. This is only applicable for read-only
* transactions.
* @property {date} [readTimestamp] Execute all reads at the given timestamp.
* This is only applicable for read-only transactions.
* @property {boolean} [returnTimestamp] If `true`, returns the read timestamp.
* @property {boolean} [strong] Read at the timestamp where all previously
* committed transactions are visible. This is only applicable for read-only
* transactions.
*/
/**
* Use a Transaction object to read and write against your Cloud Spanner
* database.
*
* **This object is created and returned from {@link Database#runTransaction}.**
*
* @class
* @extends TransactionRequest
*
* @param {Session} session The parent Session object.
* @param {TransactionOptions} [options] [Transaction options](https://cloud.google.com/spanner/docs/timestamp-bounds).
*
* @example
* const Spanner = require('@google-cloud/spanner');
* const spanner = new Spanner();
*
* const instance = spanner.instance('my-instance');
* const database = instance.database('my-database');
*
* database.runTransaction(function(err, transaction) {
* // The `transaction` object is ready for use.
* });
*/
function Transaction(session, options) {
/**
* @name Transaction#session
* @type {Session}
*/
this.session = session;
/**
* @name Transaction#transaction
* @type {boolean}
* @default true
* @private
*/
this.transaction = true;
options = extend({}, options);
this.queuedMutations_ = [];
this.runFn_ = null;
this.beginTime_ = null;
this.timeout_ = DEFAULT_TRANSACTION_TIMEOUT;
this.ended_ = false;
if (is.number(options.timeout)) {
this.timeout_ = options.timeout;
delete options.timeout;
}
TransactionRequest.call(this, options);
}
util.inherits(Transaction, TransactionRequest);
/**
* In the event that a Transaction is aborted and the deadline has been
* exceeded, we'll alter the error from aborted to deadline exceeded.
*
* @private
*
* @param {error} err The original error.
* @return {object}
*/
Transaction.createDeadlineError_ = function(err) {
return extend({}, err, {
code: 4,
message: 'Deadline for Transaction exceeded.',
});
};
/**
* Extracts retry delay and formats into milliseconds.
*
* @private
*
* @param {error} error A request error.
* @return {number}
*/
Transaction.getRetryDelay_ = function(err) {
var retryInfo = err.metadata.get(RETRY_INFO_KEY)[0];
var retryDelay = RetryInfo.decode(retryInfo).retryDelay;
var seconds = parseInt(retryDelay.seconds.toNumber(), 10) * 1000;
var milliseconds = parseInt(retryDelay.nanos, 10) / 1e6;
return seconds + milliseconds;
};
/**
* Begin a new transaction.
*
* @private
*
* @see [BeginTransaction API Documentation](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.BeginTransaction)
*
* @param {object=} options Timestamp bound options.
* @param {function} callback The callback function.
* @param {?error} callback.err An error returned while making this request.
* @param {object} callback.apiResponse The full API response.
*
* @example
* transaction.begin(function(err) {
* if (!err) {
* // Transaction began successfully.
* }
* });
*
* //-
* // If the callback is omitted, we'll return a Promise.
* //-
* transaction.begin()
* .then(function(data) {
* var apiResponse = data[0];
* });
*/
Transaction.prototype.begin = function(callback) {
var self = this;
var options;
if (!this.readOnly) {
options = {
readWrite: {},
};
} else {
options = {
readOnly: extend(
{
returnReadTimestamp: true,
},
this.options
),
};
}
var reqOpts = {
options: options,
};
this.request(
{
client: 'SpannerClient',
method: 'beginTransaction',
reqOpts: reqOpts,
},
function(err, resp) {
if (err) {
callback(err);
return;
}
self.ended_ = false;
self.id = resp.id;
self.metadata = resp;
if (resp.readTimestamp) {
self.readTimestamp = TransactionRequest.fromProtoTimestamp_(
resp.readTimestamp
);
}
callback(null, resp);
}
);
};
/**
* Commit the transaction.
*
* Wrapper around {@link v1.SpannerClient#commit}.
*
* @see {@link v1.SpannerClient#commit}
* @see [Commit API Documentation](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.Commit)
*
* @throws {Error} If transaction has already been ended.
*
* @param {BasicCallback} [callback] Callback function.
* @returns {Promise<BasicResponse>}
*
* @example
* const Spanner = require('@google-cloud/spanner');
* const spanner = new Spanner();
*
* const instance = spanner.instance('my-instance');
* const database = instance.database('my-database');
*
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* // Queue a mutation (note that there is no callback passed to `insert`).
* transaction.insert('Singers', {
* SingerId: 'Id3b',
* Name: 'Joe West'
* });
*
* // Commit the transaction.
* transaction.commit(function(err) {
* if (!err) {
* // Mutations were committed successfully.
* }
* });
* });
*/
Transaction.prototype.commit = function(callback) {
var self = this;
if (this.ended_) {
throw new Error('Transaction has already been ended.');
}
var reqOpts = {
mutations: this.queuedMutations_,
};
if (this.id) {
reqOpts.transactionId = this.id;
} else {
reqOpts.singleUseTransaction = {
readWrite: {},
};
}
this.request(
{
client: 'SpannerClient',
method: 'commit',
reqOpts: reqOpts,
},
function(err, resp) {
if (!err) {
self.end();
}
callback(err, resp);
}
);
};
/**
* Let the client know you're done with a particular transaction. This should
* only be called for read-only transactions.
*
* @throws {Error} If transaction has already been ended.
*
* @param {function} callback Optional callback function to be called after
* transaction has ended.
*
* @example
* const Spanner = require('@google-cloud/spanner');
* const spanner = new Spanner();
*
* const instance = spanner.instance('my-instance');
* const database = instance.database('my-database');
*
* const options = {
* readOnly: true
* };
*
* database.runTransaction(options, function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* transaction.run('SELECT * FROM Singers', function(err, rows) {
* if (err) {
* // Error handling omitted.
* }
*
* // End the transaction. Note that no callback is provided.
* transaction.end();
* });
* });
*/
Transaction.prototype.end = function(callback) {
if (this.ended_) {
throw new Error('Transaction has already been ended.');
}
this.ended_ = true;
this.queuedMutations_ = [];
this.runFn_ = null;
delete this.id;
if (is.fn(callback)) {
callback();
}
};
/**
* Queue a mutation until {@link Transaction#commit} is called.
*
* @private
*/
Transaction.prototype.queue_ = function(mutation) {
this.queuedMutations_.push(mutation);
};
/**
* Make a regular gRPC request to Spanner.
*
* @private
*
* @param {object} config The request configuration.
* @param {function} callback The callback function.
*/
Transaction.prototype.request = function(config, callback) {
var self = this;
config.reqOpts = extend(
{
session: this.session.formattedName_,
},
config.reqOpts
);
this.session.request(config, function(err, resp) {
if (!self.runFn_ || !err || !self.isRetryableErrorCode_(err.code)) {
callback(err, resp);
return;
}
if (self.shouldRetry_(err)) {
self.retry_(Transaction.getRetryDelay_(err));
return;
}
self.runFn_(Transaction.createDeadlineError_(err));
});
};
/**
* Make a streaming gRPC request to Spanner.
*
* @private
*
* @param {object} config The request configuration.
* @returns {ReadableStream}
*/
Transaction.prototype.requestStream = function(config) {
var self = this;
config.reqOpts = extend(
{
session: this.session.formattedName_,
},
config.reqOpts
);
var requestStream = this.session.requestStream(config);
if (!is.fn(self.runFn_)) {
return requestStream;
}
var userStream = through.obj();
requestStream.on('error', function(err) {
if (!self.isRetryableErrorCode_(err.code)) {
userStream.destroy(err);
return;
}
userStream.destroy();
if (self.shouldRetry_(err)) {
self.retry_(Transaction.getRetryDelay_(err));
return;
}
self.runFn_(Transaction.createDeadlineError_(err));
});
return requestStream.pipe(userStream);
};
/**
* Retry the transaction by running the original "runFn" after a pre-
* determined delay.
*
* @private
*/
Transaction.prototype.retry_ = function(delay) {
var self = this;
this.begin(function(err) {
if (err) {
self.runFn_(err);
return;
}
self.queuedMutations_ = [];
setTimeout(function() {
self.runFn_(null, self);
}, delay);
});
};
/**
* Roll back a transaction, releasing any locks it holds. It is a good idea to
* call this for any transaction that includes one or more queries that you
* decide not to commit.
*
* Wrapper around {@link v1.SpannerClient#rollback}.
*
* @see {@link v1.SpannerClient#rollback}
* @see [Rollback API Documentation](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.Rollback)
*
* @param {BasicCallback} [callback] Callback function.
* @returns {Promise<BasicResponse>}
*
* @example
* const Spanner = require('@google-cloud/spanner');
* const spanner = new Spanner();
*
* const instance = spanner.instance('my-instance');
* const database = instance.database('my-database');
*
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* transaction.rollback(function(err) {
* if (!err) {
* // Transaction rolled back successfully.
* }
* });
* });
*/
Transaction.prototype.rollback = function(callback) {
var self = this;
if (!this.id) {
throw new Error('Transaction ID is unknown, nothing to rollback.');
}
var reqOpts = {
transactionId: this.id,
};
this.request(
{
client: 'SpannerClient',
method: 'rollback',
reqOpts: reqOpts,
},
function(err, resp) {
if (!err) {
self.end();
}
callback(err, resp);
}
);
};
/**
* Execute a SQL statement on this database inside of a transaction.
*
* **Performance Considerations:**
*
* This method wraps the streaming method,
* {@link Transaction#run} for your convenience. All rows will
* be stored in memory before being released to your callback. If you intend on
* receiving a lot of results from your query, consider using the streaming
* method, so you can free each result from memory after consuming it.
*
* Wrapper around {@link v1.SpannerClient#executeStreamingSql}.
*
* @see {@link v1.SpannerClient#executeStreamingSql}
* @see [ExecuteStreamingSql API Documentation](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.ExecuteStreamingSql)
* @see [ExecuteSqlRequest API Documentation](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.ExecuteSqlRequest)
*
* @param {string|object} query A SQL query or
* [`ExecuteSqlRequest`](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.ExecuteSqlRequest)
* object.
* @param {object} [query.params] A map of parameter name to values.
* @param {object} [query.types] A map of parameter types.
* @param {RunCallback} [callback] Callback function.
* @returns {Promise<RunResponse>}
*
* @example
* const Spanner = require('@google-cloud/spanner');
* const spanner = new Spanner();
*
* const instance = spanner.instance('my-instance');
* const database = instance.database('my-database');
*
* const query = 'SELECT * FROM Singers';
*
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* transaction.run(query, function(err, rows) {
* if (err) {
* // Error handling omitted.
* }
*
* // rows = [
* // {
* // SingerId: '1',
* // Name: 'Eddie Wilson'
* // }
* // ]
* });
* });
*
* //-
* // The SQL query string can contain parameter placeholders. A parameter
* // placeholder consists of '@' followed by the parameter name.
* //-
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* const query = {
* sql: 'SELECT * FROM Singers WHERE name = @name',
* params: {
* name: 'Eddie Wilson'
* }
* };
*
* transaction.run(query, function(err, rows) {});
* });
*
* //-
* // If you need to enforce a specific param type, a types map can be provided.
* // This is typically useful if your param value can be null.
* //-
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* const query = {
* sql: 'SELECT * FROM Singers WHERE name = @name AND id = @id',
* params: {
* id: spanner.int(8),
* name: null
* },
* types: {
* id: 'int64',
* name: 'string'
* }
* };
*
* transaction.run(query, function(err, rows) {});
* });
*/
Transaction.prototype.run = function(query, callback) {
var rows = [];
this.runStream(query)
.on('error', callback)
.on('data', function(row) {
rows.push(row);
})
.on('end', function() {
callback(null, rows);
});
};
/**
* Create a readable object stream to receive resulting rows from a SQL
* statement.
*
* Wrapper around {@link v1.SpannerClient#executeStreamingSql}.
*
* @see {@link v1.SpannerClient#executeStreamingSql}
* @see [ExecuteStreamingSql API Documentation](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.Spanner.ExecuteStreamingSql)
* @see [ExecuteSqlRequest API Documentation](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.ExecuteSqlRequest)
*
* @param {string|object} query - A SQL query or
* [`ExecuteSqlRequest`](https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.ExecuteSqlRequest)
* object.
* @param {object} [query.params] A map of parameter name to values.
* @param {object} [query.types] A map of parameter types.
* @returns {ReadableStream}
*
* @example
* const Spanner = require('@google-cloud/spanner');
* const spanner = new Spanner();
*
* const instance = spanner.instance('my-instance');
* const database = instance.database('my-database');
*
* const query = 'SELECT * FROM Singers';
*
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* transaction.runStream(query)
* .on('error', function(err) {})
* .on('data', function(row) {
* // row = {
* // SingerId: '1',
* // Name: 'Eddie Wilson'
* // }
* })
* .on('end', function() {
* // All results retrieved.
* });
* });
*
* //-
* // The SQL query string can contain parameter placeholders. A parameter
* // placeholder consists of '@' followed by the parameter name.
* //-
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* const query = {
* sql: 'SELECT * FROM Singers WHERE name = @name',
* params: {
* name: 'Eddie Wilson'
* }
* };
*
* transaction.runStream(query)
* .on('error', function(err) {})
* .on('data', function(row) {})
* .on('end', function() {});
* });
*
* //-
* // If you anticipate many results, you can end a stream early to prevent
* // unnecessary processing and API requests.
* //-
* database.runTransaction(function(err, transaction) {
* if (err) {
* // Error handling omitted.
* }
*
* transaction.runStream(query)
* .on('data', function(row) {
* this.end();
* })
* .on('end', function() {});
* });
*/
Transaction.prototype.runStream = function(query) {
var self = this;
if (is.string(query)) {
query = {
sql: query,
};
}
var reqOpts = extend(
{
transaction: {},
},
codec.encodeQuery(query)
);
if (this.id) {
reqOpts.transaction.id = this.id;
} else {
reqOpts.transaction.singleUse = {
readOnly: this.options || {},
};
}
function makeRequest(resumeToken) {
return self.requestStream({
client: 'SpannerClient',
method: 'executeStreamingSql',
reqOpts: extend({}, reqOpts, {resumeToken: resumeToken}),
});
}
return new PartialResultStream(makeRequest);
};
/**
* Determines whether or not this Transaction should be retried in the event
* of a retryable error.
*
* @param {error} err - The request error.
* @return {boolean}
*/
Transaction.prototype.shouldRetry_ = function(err) {
return (
this.isRetryableErrorCode_(err.code) &&
is.fn(this.runFn_) &&
Date.now() - this.beginTime_ < this.timeout_ &&
err.metadata.get(RETRY_INFO_KEY).length > 0
);
};
/**
* Specifies whether a specific error code can be retried.
*
* @param {number} errCode - the error code
* @return {boolean}
*/
Transaction.prototype.isRetryableErrorCode_ = function(errCode) {
return errCode === ABORTED || errCode === UNKNOWN;
};
/*! Developer Documentation
*
* All async methods (except for streams) will return a Promise in the event
* that a callback is omitted.
*/
common.util.promisifyAll(Transaction);
/**
* Reference to the {@link Transaction} class.
* @name module:@google-cloud/spanner.Transaction
* @see Transaction
*/
module.exports = Transaction;