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transaction.ts
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/*!
* Copyright 2017 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.
*/
import * as firestore from '@google-cloud/firestore';
import {GoogleError} from 'google-gax';
import * as proto from '../protos/firestore_v1_proto_api';
import {ExponentialBackoff} from './backoff';
import {DocumentSnapshot} from './document';
import {DEFAULT_MAX_TRANSACTION_ATTEMPTS, Firestore, WriteBatch} from './index';
import {Timestamp} from './timestamp';
import {logger} from './logger';
import {FieldPath, validateFieldPath} from './path';
import {StatusCode} from './status-code';
import {
AggregateQuery,
AggregateQuerySnapshot,
DocumentReference,
Query,
QuerySnapshot,
validateDocumentReference,
} from './reference';
import {isObject, isPlainObject} from './util';
import {
invalidArgumentMessage,
RequiredArgumentOptions,
validateMinNumberOfArguments,
validateOptional,
} from './validate';
import {DocumentReader} from './document-reader';
import api = proto.google.firestore.v1;
/*!
* Error message for transactional reads that were executed after performing
* writes.
*/
const READ_AFTER_WRITE_ERROR_MSG =
'Firestore transactions require all reads to be executed before all writes.';
const READ_ONLY_WRITE_ERROR_MSG =
'Firestore read-only transactions cannot execute writes.';
/**
* A reference to a transaction.
*
* The Transaction object passed to a transaction's updateFunction provides
* the methods to read and write data within the transaction context. See
* [runTransaction()]{@link Firestore#runTransaction}.
*
* @class Transaction
*/
export class Transaction implements firestore.Transaction {
private readonly _firestore: Firestore;
private readonly _readOnly: boolean = false;
private readonly _maxAttempts: number = DEFAULT_MAX_TRANSACTION_ATTEMPTS;
private readonly _writeBatch: WriteBatch;
private readonly _backoff: ExponentialBackoff;
private readonly _requestTag: string;
private _transactionId?: Uint8Array;
private readonly _readTime: Timestamp | undefined;
/**
* @private
*
* @param firestore The Firestore Database client.
* @param requestTag A unique client-assigned identifier for the scope of
* this transaction.
* @param transactionOptions The user-defined options for this transaction.
*/
constructor(
firestore: Firestore,
requestTag: string,
transactionOptions?:
| firestore.ReadWriteTransactionOptions
| firestore.ReadOnlyTransactionOptions
) {
this._firestore = firestore;
this._writeBatch = firestore.batch();
this._requestTag = requestTag;
this._backoff = new ExponentialBackoff();
if (transactionOptions) {
if (transactionOptions.readOnly) {
this._readOnly = true;
this._maxAttempts = 1;
this._readTime = transactionOptions.readTime as Timestamp | undefined;
} else {
this._maxAttempts =
transactionOptions.maxAttempts || DEFAULT_MAX_TRANSACTION_ATTEMPTS;
}
}
}
/**
* Retrieves a query result. Holds a pessimistic lock on all returned
* documents.
*
* @param {Query} query A query to execute.
* @return {Promise<QuerySnapshot>} A QuerySnapshot for the retrieved data.
*/
get<AppModelType, DbModelType extends firestore.DocumentData>(
query: firestore.Query<AppModelType, DbModelType>
): Promise<QuerySnapshot<AppModelType, DbModelType>>;
/**
* Reads the document referenced by the provided `DocumentReference.`
* Holds a pessimistic lock on the returned document.
*
* @param {DocumentReference} documentRef A reference to the document to be read.
* @return {Promise<DocumentSnapshot>} A DocumentSnapshot for the read data.
*/
get<AppModelType, DbModelType extends firestore.DocumentData>(
documentRef: firestore.DocumentReference<AppModelType, DbModelType>
): Promise<DocumentSnapshot<AppModelType, DbModelType>>;
/**
* Retrieves an aggregate query result. Holds a pessimistic lock on all
* documents that were matched by the underlying query.
*
* @param aggregateQuery An aggregate query to execute.
* @return An AggregateQuerySnapshot for the retrieved data.
*/
get<
AppModelType,
DbModelType extends firestore.DocumentData,
AggregateSpecType extends firestore.AggregateSpec,
>(
aggregateQuery: firestore.AggregateQuery<
AggregateSpecType,
AppModelType,
DbModelType
>
): Promise<
AggregateQuerySnapshot<AggregateSpecType, AppModelType, DbModelType>
>;
/**
* Retrieve a document or a query result from the database. Holds a
* pessimistic lock on all returned documents.
*
* @param {DocumentReference|Query} refOrQuery The document or query to
* return.
* @returns {Promise} A Promise that resolves with a DocumentSnapshot or
* QuerySnapshot for the returned documents.
*
* @example
* ```
* firestore.runTransaction(transaction => {
* let documentRef = firestore.doc('col/doc');
* return transaction.get(documentRef).then(doc => {
* if (doc.exists) {
* transaction.update(documentRef, { count: doc.get('count') + 1 });
* } else {
* transaction.create(documentRef, { count: 1 });
* }
* });
* });
* ```
*/
get<
AppModelType,
DbModelType extends firestore.DocumentData,
AggregateSpecType extends firestore.AggregateSpec,
>(
refOrQuery:
| firestore.DocumentReference<AppModelType, DbModelType>
| firestore.Query<AppModelType, DbModelType>
| firestore.AggregateQuery<AggregateSpecType, AppModelType, DbModelType>
): Promise<
| DocumentSnapshot<AppModelType, DbModelType>
| QuerySnapshot<AppModelType, DbModelType>
| AggregateQuerySnapshot<AggregateSpecType, AppModelType, DbModelType>
> {
if (!this._writeBatch.isEmpty) {
throw new Error(READ_AFTER_WRITE_ERROR_MSG);
}
if (refOrQuery instanceof DocumentReference) {
const documentReader = new DocumentReader(this._firestore, [refOrQuery]);
documentReader.transactionId = this._transactionId;
documentReader.readTime = this._readTime;
return documentReader.get(this._requestTag).then(([res]) => res);
}
if (refOrQuery instanceof Query) {
return refOrQuery._get(this._transactionId || this._readTime);
}
if (refOrQuery instanceof AggregateQuery) {
return refOrQuery._get(this._transactionId || this._readTime);
}
throw new Error(
'Value for argument "refOrQuery" must be a DocumentReference, Query, or AggregateQuery.'
);
}
/**
* Retrieves multiple documents from Firestore. Holds a pessimistic lock on
* all returned documents.
*
* The first argument is required and must be of type `DocumentReference`
* followed by any additional `DocumentReference` documents. If used, the
* optional `ReadOptions` must be the last argument.
*
* @param {...DocumentReference|ReadOptions} documentRefsOrReadOptions The
* `DocumentReferences` to receive, followed by an optional field mask.
* @returns {Promise<Array.<DocumentSnapshot>>} A Promise that
* contains an array with the resulting document snapshots.
*
* @example
* ```
* let firstDoc = firestore.doc('col/doc1');
* let secondDoc = firestore.doc('col/doc2');
* let resultDoc = firestore.doc('col/doc3');
*
* firestore.runTransaction(transaction => {
* return transaction.getAll(firstDoc, secondDoc).then(docs => {
* transaction.set(resultDoc, {
* sum: docs[0].get('count') + docs[1].get('count')
* });
* });
* });
* ```
*/
getAll<AppModelType, DbModelType extends firestore.DocumentData>(
...documentRefsOrReadOptions: Array<
| firestore.DocumentReference<AppModelType, DbModelType>
| firestore.ReadOptions
>
): Promise<Array<DocumentSnapshot<AppModelType, DbModelType>>> {
if (!this._writeBatch.isEmpty) {
throw new Error(READ_AFTER_WRITE_ERROR_MSG);
}
validateMinNumberOfArguments(
'Transaction.getAll',
documentRefsOrReadOptions,
1
);
const {documents, fieldMask} = parseGetAllArguments(
documentRefsOrReadOptions
);
const documentReader = new DocumentReader(this._firestore, documents);
documentReader.fieldMask = fieldMask || undefined;
documentReader.transactionId = this._transactionId;
documentReader.readTime = this._readTime;
return documentReader.get(this._requestTag);
}
/**
* Create the document referred to by the provided
* [DocumentReference]{@link DocumentReference}. The operation will
* fail the transaction if a document exists at the specified location.
*
* @param {DocumentReference} documentRef A reference to the document to be
* created.
* @param {DocumentData} data The object data to serialize as the document.
* @returns {Transaction} This Transaction instance. Used for
* chaining method calls.
*
* @example
* ```
* firestore.runTransaction(transaction => {
* let documentRef = firestore.doc('col/doc');
* return transaction.get(documentRef).then(doc => {
* if (!doc.exists) {
* transaction.create(documentRef, { foo: 'bar' });
* }
* });
* });
* ```
*/
create<AppModelType, DbModelType extends firestore.DocumentData>(
documentRef: firestore.DocumentReference<AppModelType, DbModelType>,
data: firestore.WithFieldValue<AppModelType>
): Transaction {
if (this._readOnly) {
throw new Error(READ_ONLY_WRITE_ERROR_MSG);
}
this._writeBatch.create(documentRef, data);
return this;
}
set<AppModelType, DbModelType extends firestore.DocumentData>(
documentRef: firestore.DocumentReference<AppModelType, DbModelType>,
data: firestore.PartialWithFieldValue<AppModelType>,
options: firestore.SetOptions
): Transaction;
set<AppModelType, DbModelType extends firestore.DocumentData>(
documentRef: firestore.DocumentReference<AppModelType, DbModelType>,
data: firestore.WithFieldValue<AppModelType>
): Transaction;
/**
* Writes to the document referred to by the provided
* [DocumentReference]{@link DocumentReference}. If the document
* does not exist yet, it will be created. If you pass
* [SetOptions]{@link SetOptions}, the provided data can be merged into the
* existing document.
*
* @param {DocumentReference} documentRef A reference to the document to be
* set.
* @param {T|Partial<T>} data The object to serialize as the document.
* @param {SetOptions=} options An object to configure the set behavior.
* @param {boolean=} options.merge - If true, set() merges the values
* specified in its data argument. Fields omitted from this set() call remain
* untouched. If your input sets any field to an empty map, all nested fields
* are overwritten.
* @param {Array.<string|FieldPath>=} options.mergeFields - If provided,
* set() only replaces the specified field paths. Any field path that is not
* specified is ignored and remains untouched. If your input sets any field to
* an empty map, all nested fields are overwritten.
* @throws {Error} If the provided input is not a valid Firestore document.
* @returns {Transaction} This Transaction instance. Used for
* chaining method calls.
*
* @example
* ```
* firestore.runTransaction(transaction => {
* let documentRef = firestore.doc('col/doc');
* transaction.set(documentRef, { foo: 'bar' });
* return Promise.resolve();
* });
* ```
*/
set<AppModelType, DbModelType extends firestore.DocumentData>(
documentRef: firestore.DocumentReference<AppModelType, DbModelType>,
data: firestore.PartialWithFieldValue<AppModelType>,
options?: firestore.SetOptions
): Transaction {
if (this._readOnly) {
throw new Error(READ_ONLY_WRITE_ERROR_MSG);
}
if (options) {
this._writeBatch.set(documentRef, data, options);
} else {
this._writeBatch.set(
documentRef,
data as firestore.WithFieldValue<AppModelType>
);
}
return this;
}
/**
* Updates fields in the document referred to by the provided
* [DocumentReference]{@link DocumentReference}. The update will
* fail if applied to a document that does not exist.
*
* The update() method accepts either an object with field paths encoded as
* keys and field values encoded as values, or a variable number of arguments
* that alternate between field paths and field values. Nested fields can be
* updated by providing dot-separated field path strings or by providing
* FieldPath objects.
*
* A Precondition restricting this update can be specified as the last
* argument.
*
* @param {DocumentReference} documentRef A reference to the document to be
* updated.
* @param {UpdateData|string|FieldPath} dataOrField An object
* containing the fields and values with which to update the document
* or the path of the first field to update.
* @param {
* ...(Precondition|*|string|FieldPath)} preconditionOrValues -
* An alternating list of field paths and values to update or a Precondition
* to to enforce on this update.
* @throws {Error} If the provided input is not valid Firestore data.
* @returns {Transaction} This Transaction instance. Used for
* chaining method calls.
*
* @example
* ```
* firestore.runTransaction(transaction => {
* let documentRef = firestore.doc('col/doc');
* return transaction.get(documentRef).then(doc => {
* if (doc.exists) {
* transaction.update(documentRef, { count: doc.get('count') + 1 });
* } else {
* transaction.create(documentRef, { count: 1 });
* }
* });
* });
* ```
*/
update<AppModelType, DbModelType extends firestore.DocumentData>(
documentRef: firestore.DocumentReference<AppModelType, DbModelType>,
dataOrField:
| firestore.UpdateData<DbModelType>
| string
| firestore.FieldPath,
...preconditionOrValues: Array<
firestore.Precondition | unknown | string | firestore.FieldPath
>
): Transaction {
if (this._readOnly) {
throw new Error(READ_ONLY_WRITE_ERROR_MSG);
}
// eslint-disable-next-line prefer-rest-params
validateMinNumberOfArguments('Transaction.update', arguments, 2);
this._writeBatch.update(documentRef, dataOrField, ...preconditionOrValues);
return this;
}
/**
* Deletes the document referred to by the provided [DocumentReference]
* {@link DocumentReference}.
*
* @param {DocumentReference} documentRef A reference to the document to be
* deleted.
* @param {Precondition=} precondition A precondition to enforce for this
* delete.
* @param {Timestamp=} precondition.lastUpdateTime If set, enforces that the
* document was last updated at lastUpdateTime. Fails the transaction if the
* document doesn't exist or was last updated at a different time.
* @param {boolean=} precondition.exists If set, enforces that the target
* document must or must not exist.
* @returns {Transaction} This Transaction instance. Used for
* chaining method calls.
*
* @example
* ```
* firestore.runTransaction(transaction => {
* let documentRef = firestore.doc('col/doc');
* transaction.delete(documentRef);
* return Promise.resolve();
* });
* ```
*/
delete(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
documentRef: DocumentReference<any, any>,
precondition?: firestore.Precondition
): this {
if (this._readTime) {
throw new Error(READ_ONLY_WRITE_ERROR_MSG);
}
this._writeBatch.delete(documentRef, precondition);
return this;
}
/**
* Starts a transaction and obtains the transaction id from the server.
*
* @private
* @internal
*/
async begin(): Promise<void> {
const request: api.IBeginTransactionRequest = {
database: this._firestore.formattedName,
};
if (this._readOnly) {
request.options = {
readOnly: {},
};
} else if (this._transactionId) {
request.options = {
readWrite: {
retryTransaction: this._transactionId,
},
};
}
const resp = await this._firestore.request<
api.IBeginTransactionRequest,
api.IBeginTransactionResponse
>('beginTransaction', request, this._requestTag);
this._transactionId = resp.transaction!;
}
/**
* Commits all queued-up changes in this transaction and releases all locks.
*
* @private
* @internal
*/
async commit(): Promise<void> {
if (this._readTime) {
throw new Error(READ_ONLY_WRITE_ERROR_MSG);
}
await this._writeBatch._commit({
transactionId: this._transactionId,
requestTag: this._requestTag,
});
}
/**
* Releases all locks and rolls back this transaction.
*
* @private
* @internal
*/
async rollback(): Promise<void> {
if (!this._transactionId || this._readOnly) {
return;
}
const request = {
database: this._firestore.formattedName,
transaction: this._transactionId,
};
try {
await this._firestore.request('rollback', request, this._requestTag);
} catch (reason) {
logger(
'Firestore.runTransaction',
this._requestTag,
'Best effort to rollback failed with error:',
reason
);
}
}
/**
* Executes `updateFunction()` and commits the transaction with retry.
*
* @private
* @internal
* @param updateFunction The user function to execute within the transaction
* context.
*/
async runTransaction<T>(
updateFunction: (transaction: Transaction) => Promise<T>
): Promise<T> {
if (this._maxAttempts === 1) {
return this.runTransactionOnce(updateFunction);
}
let lastError: GoogleError | undefined = undefined;
for (let attempt = 0; attempt < this._maxAttempts; ++attempt) {
try {
if (lastError) {
logger(
'Firestore.runTransaction',
this._requestTag,
'Retrying transaction after error:',
lastError
);
}
this._writeBatch._reset();
await this.maybeBackoff(lastError);
return await this.runTransactionOnce(updateFunction);
} catch (err) {
lastError = err;
if (!this._transactionId || !isRetryableTransactionError(err)) {
break;
}
}
}
logger(
'Firestore.runTransaction',
this._requestTag,
'Transaction not eligible for retry, returning error: %s',
lastError
);
return Promise.reject(lastError);
}
/**
* Make single attempt to execute `updateFunction()` and commit the
* transaction. Will rollback upon error.
*
* @private
* @internal
* @param updateFunction The user function to execute within the transaction
* context.
*/
async runTransactionOnce<T>(
updateFunction: (transaction: Transaction) => Promise<T>
): Promise<T> {
if (!this._readTime) {
await this.begin();
}
try {
const promise = updateFunction(this);
if (!(promise instanceof Promise)) {
throw new Error(
'You must return a Promise in your transaction()-callback.'
);
}
const result = await promise;
if (!this._readOnly) {
await this.commit();
}
return result;
} catch (err) {
logger(
'Firestore.runTransaction',
this._requestTag,
'Rolling back transaction after callback error:',
err
);
await this.rollback();
return Promise.reject(err);
}
}
/**
* Delays further operations based on the provided error.
*
* @private
* @internal
* @return A Promise that resolves after the delay expired.
*/
private async maybeBackoff(error?: GoogleError): Promise<void> {
if ((error?.code as number | undefined) === StatusCode.RESOURCE_EXHAUSTED) {
this._backoff.resetToMax();
}
await this._backoff.backoffAndWait();
}
}
/**
* Parses the arguments for the `getAll()` call supported by both the Firestore
* and Transaction class.
*
* @private
* @internal
* @param documentRefsOrReadOptions An array of document references followed by
* an optional ReadOptions object.
*/
export function parseGetAllArguments<
AppModelType,
DbModelType extends firestore.DocumentData,
>(
documentRefsOrReadOptions: Array<
| firestore.DocumentReference<AppModelType, DbModelType>
| firestore.ReadOptions
>
): {
documents: Array<DocumentReference<AppModelType, DbModelType>>;
fieldMask: FieldPath[] | null;
} {
let documents: Array<DocumentReference<AppModelType, DbModelType>>;
let readOptions: firestore.ReadOptions | undefined = undefined;
if (Array.isArray(documentRefsOrReadOptions[0])) {
throw new Error(
'getAll() no longer accepts an array as its first argument. ' +
'Please unpack your array and call getAll() with individual arguments.'
);
}
if (
documentRefsOrReadOptions.length > 0 &&
isPlainObject(
documentRefsOrReadOptions[documentRefsOrReadOptions.length - 1]
)
) {
readOptions = documentRefsOrReadOptions.pop() as firestore.ReadOptions;
documents = documentRefsOrReadOptions as Array<
DocumentReference<AppModelType, DbModelType>
>;
} else {
documents = documentRefsOrReadOptions as Array<
DocumentReference<AppModelType, DbModelType>
>;
}
for (let i = 0; i < documents.length; ++i) {
validateDocumentReference<AppModelType, DbModelType>(i, documents[i]);
}
validateReadOptions('options', readOptions, {optional: true});
const fieldMask =
readOptions && readOptions.fieldMask
? readOptions.fieldMask.map(fieldPath =>
FieldPath.fromArgument(fieldPath)
)
: null;
return {fieldMask, documents};
}
/**
* Validates the use of 'options' as ReadOptions and enforces that 'fieldMask'
* is an array of strings or field paths.
*
* @private
* @internal
* @param arg The argument name or argument index (for varargs methods).
* @param value The input to validate.
* @param options Options that specify whether the ReadOptions can be omitted.
*/
function validateReadOptions(
arg: number | string,
value: unknown,
options?: RequiredArgumentOptions
): void {
if (!validateOptional(value, options)) {
if (!isObject(value)) {
throw new Error(
`${invalidArgumentMessage(arg, 'read option')} Input is not an object.'`
);
}
const options = value as {[k: string]: unknown};
if (options.fieldMask !== undefined) {
if (!Array.isArray(options.fieldMask)) {
throw new Error(
`${invalidArgumentMessage(
arg,
'read option'
)} "fieldMask" is not an array.`
);
}
for (let i = 0; i < options.fieldMask.length; ++i) {
try {
validateFieldPath(i, options.fieldMask[i]);
} catch (err) {
throw new Error(
`${invalidArgumentMessage(
arg,
'read option'
)} "fieldMask" is not valid: ${err.message}`
);
}
}
}
}
}
function isRetryableTransactionError(error: GoogleError): boolean {
if (error.code !== undefined) {
// This list is based on https://github.com/firebase/firebase-js-sdk/blob/master/packages/firestore/src/core/transaction_runner.ts#L112
switch (error.code as number) {
case StatusCode.ABORTED:
case StatusCode.CANCELLED:
case StatusCode.UNKNOWN:
case StatusCode.DEADLINE_EXCEEDED:
case StatusCode.INTERNAL:
case StatusCode.UNAVAILABLE:
case StatusCode.UNAUTHENTICATED:
case StatusCode.RESOURCE_EXHAUSTED:
return true;
case StatusCode.INVALID_ARGUMENT:
// The Firestore backend uses "INVALID_ARGUMENT" for transactions
// IDs that have expired. While INVALID_ARGUMENT is generally not
// retryable, we retry this specific case.
return !!error.message.match(/transaction has expired/);
default:
return false;
}
}
return false;
}