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| /**
* Copyright 2017 Google Inc.
*
* 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 api from '../protos/firestore_proto_api';
import { Query } from '../core/query';
import { SnapshotVersion } from '../core/snapshot_version';
import { Timestamp } from '../core/timestamp';
import { Document, MaybeDocument, NoDocument } from '../model/document';
import { DocumentKey } from '../model/document_key';
import { MutationBatch } from '../model/mutation_batch';
import { JsonProtoSerializer } from '../remote/serializer';
import { assert, fail } from '../util/assert';
import {
DbMutationBatch,
DbNoDocument,
DbQuery,
DbRemoteDocument,
DbTarget,
DbTimestamp
} from './indexeddb_schema';
import { QueryData, QueryPurpose } from './query_data';
/** Serializer for values stored in the LocalStore. */
export class LocalSerializer {
constructor(private remoteSerializer: JsonProtoSerializer) {}
/** Decodes a remote document from storage locally to a Document. */
fromDbRemoteDocument(remoteDoc: DbRemoteDocument): MaybeDocument {
if (remoteDoc.document) {
return this.remoteSerializer.fromDocument(remoteDoc.document);
} else Eif (remoteDoc.noDocument) {
const key = DocumentKey.fromSegments(remoteDoc.noDocument.path);
const readTime = remoteDoc.noDocument.readTime;
const timestamp = new Timestamp(readTime.seconds, readTime.nanos);
return new NoDocument(key, SnapshotVersion.fromTimestamp(timestamp));
} else {
return fail('Unexpected DbRemoteDocument');
}
}
/** Encodes a document for storage locally. */
toDbRemoteDocument(maybeDoc: MaybeDocument): DbRemoteDocument {
if (maybeDoc instanceof Document) {
const doc = this.remoteSerializer.toDocument(maybeDoc);
return new DbRemoteDocument(null, doc);
} else {
const path = maybeDoc.key.path.toArray();
const timestamp = maybeDoc.version.toTimestamp();
const readTime = new DbTimestamp(timestamp.seconds, timestamp.nanos);
return new DbRemoteDocument(new DbNoDocument(path, readTime), null);
}
}
/** Encodes a batch of mutations into a DbMutationBatch for local storage. */
toDbMutationBatch(userId: string, batch: MutationBatch): DbMutationBatch {
const serializedMutations = batch.mutations.map(m =>
this.remoteSerializer.toMutation(m)
);
return new DbMutationBatch(
userId,
batch.batchId,
batch.localWriteTime.toEpochMilliseconds(),
serializedMutations
);
}
/** Decodes a DbMutationBatch into a MutationBatch */
fromDbMutationBatch(dbBatch: DbMutationBatch): MutationBatch {
const mutations = dbBatch.mutations.map(m =>
this.remoteSerializer.fromMutation(m)
);
const timestamp = Timestamp.fromEpochMilliseconds(dbBatch.localWriteTimeMs);
return new MutationBatch(dbBatch.batchId, timestamp, mutations);
}
/** Decodes a DbTarget into QueryData */
fromDbTarget(dbTarget: DbTarget): QueryData {
const readTime = new Timestamp(
dbTarget.readTime.seconds,
dbTarget.readTime.nanos
);
const version = SnapshotVersion.fromTimestamp(readTime);
let query: Query;
if (isDocumentQuery(dbTarget.query)) {
query = this.remoteSerializer.fromDocumentsTarget(dbTarget.query);
} else {
query = this.remoteSerializer.fromQueryTarget(dbTarget.query);
}
return new QueryData(
query,
dbTarget.targetId,
QueryPurpose.Listen,
version,
dbTarget.resumeToken
);
}
/** Encodes QueryData into a DbTarget for storage locally. */
toDbTarget(queryData: QueryData): DbTarget {
assert(
QueryPurpose.Listen === queryData.purpose,
'Only queries with purpose ' +
QueryPurpose.Listen +
' may be stored, got ' +
queryData.purpose
);
const timestamp = queryData.snapshotVersion.toTimestamp();
const dbTimestamp = new DbTimestamp(timestamp.seconds, timestamp.nanos);
let queryProto: DbQuery;
if (queryData.query.isDocumentQuery()) {
queryProto = this.remoteSerializer.toDocumentsTarget(queryData.query);
} else {
queryProto = this.remoteSerializer.toQueryTarget(queryData.query);
}
assert(
typeof queryData.resumeToken === 'string',
'Persisting non-string resume token not supported.'
);
const resumeToken = queryData.resumeToken as string;
// lastListenSequenceNumber is always 0 until we do real GC.
return new DbTarget(
queryData.targetId,
queryData.query.canonicalId(),
dbTimestamp,
resumeToken,
0,
queryProto
);
}
}
/**
* A helper function for figuring out what kind of query has been stored.
*/
function isDocumentQuery(dbQuery: DbQuery): dbQuery is api.DocumentsTarget {
return (dbQuery as api.DocumentsTarget).documents !== undefined;
}
|