@selfage/datastore_client
Version:
Provides a type-safe client library to interact with Google Cloud Datastore.
184 lines • 22.6 kB
JavaScript
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.DatastoreTransaction = exports.DatastoreClient = void 0;
const bigInt = require("big-integer");
const datastore_1 = require("@google-cloud/datastore");
const parser_1 = require("@selfage/message/parser");
function parseValue(rawValue, descriptor) {
let value = parser_1.parseMessage(rawValue, descriptor.valueDescriptor);
value[descriptor.key] = rawValue[datastore_1.Datastore.KEY].name;
return value;
}
function allocateKeys(datastoreRequest, values, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
let incompleteKey = new datastore_1.Key({ path: [descriptor.name] });
let response = yield datastoreRequest.allocateIds(incompleteKey, values.length);
let keys = response[0];
for (let i = 0; i < keys.length; i++) {
let uint8Array = bigInt(keys[i].id).toArray(256).value;
values[i][descriptor.key] =
Buffer.from(uint8Array).toString("base64");
}
return values;
});
}
function getValuesByKeys(datastoreRequest, keys, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
let datastoreKeys = new Array();
for (let key of keys) {
datastoreKeys.push(new datastore_1.Key({ path: [descriptor.name, key] }));
}
let response = yield datastoreRequest.get(datastoreKeys);
let results = new Array();
for (let rawValue of response[0]) {
results.push(parseValue(rawValue, descriptor));
}
return results;
});
}
function deleteByKeys(datastoreRequest, keys, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
let datastoreKeys = new Array();
for (let key of keys) {
datastoreKeys.push(new datastore_1.Key({ path: [descriptor.name, key] }));
}
yield datastoreRequest.delete(datastoreKeys);
});
}
function saveValues(datastoreRequest, values, descriptor, method) {
return __awaiter(this, void 0, void 0, function* () {
let entities = new Array();
for (let value of values) {
let keyValue = value[descriptor.key];
let key = new datastore_1.Key({
path: [descriptor.name, keyValue],
});
delete value[descriptor.key];
entities.push({
key: key,
data: value,
excludeFromIndexes: descriptor.excludedIndexes,
method: method,
});
}
yield datastoreRequest.save(entities);
});
}
function queryValues(datastoreRequest, datastoreQuery) {
return __awaiter(this, void 0, void 0, function* () {
let query = datastoreRequest.createQuery(datastoreQuery.modelDescriptor.name);
if (datastoreQuery.startCursor) {
query.start(datastoreQuery.startCursor);
}
if (datastoreQuery.limit) {
query.limit(datastoreQuery.limit);
}
for (let filter of datastoreQuery.filters) {
query.filter(filter.fieldName, filter.operator, filter.fieldValue);
}
for (let ordering of datastoreQuery.orderings) {
query.order(ordering.fieldName, { descending: ordering.descending });
}
let response = yield query.run();
let values = new Array();
for (let rawValue of response[0]) {
values.push(parseValue(rawValue, datastoreQuery.modelDescriptor));
}
let cursor;
if (response[1].moreResults !== "NO_MORE_RESULTS") {
cursor = response[1].endCursor;
}
return {
values,
cursor,
};
});
}
class DatastoreClient {
constructor(datastore) {
this.datastore = datastore;
}
// Use default Datastore constructor.
static create() {
let datastore = new datastore_1.Datastore();
return new DatastoreClient(datastore);
}
startTransaction() {
return __awaiter(this, void 0, void 0, function* () {
let [transaction] = yield this.datastore.transaction().run();
return new DatastoreTransaction(transaction);
});
}
allocateKeys(values, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
return allocateKeys(this.datastore, values, descriptor);
});
}
get(keys, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
return getValuesByKeys(this.datastore, keys, descriptor);
});
}
delete(keys, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
return deleteByKeys(this.datastore, keys, descriptor);
});
}
save(values, descriptor, method) {
return __awaiter(this, void 0, void 0, function* () {
return saveValues(this.datastore, values, descriptor, method);
});
}
query(datastoreQuery) {
return __awaiter(this, void 0, void 0, function* () {
return queryValues(this.datastore, datastoreQuery);
});
}
}
exports.DatastoreClient = DatastoreClient;
class DatastoreTransaction {
constructor(transaction) {
this.transaction = transaction;
}
allocateKeys(values, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
return allocateKeys(this.transaction, values, descriptor);
});
}
get(keys, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
return getValuesByKeys(this.transaction, keys, descriptor);
});
}
delete(keys, descriptor) {
return __awaiter(this, void 0, void 0, function* () {
return deleteByKeys(this.transaction, keys, descriptor);
});
}
save(values, descriptor, method) {
return __awaiter(this, void 0, void 0, function* () {
return saveValues(this.transaction, values, descriptor, method);
});
}
query(datastoreQuery) {
return __awaiter(this, void 0, void 0, function* () {
return queryValues(this.transaction, datastoreQuery);
});
}
commit() {
return __awaiter(this, void 0, void 0, function* () {
yield this.transaction.commit();
});
}
}
exports.DatastoreTransaction = DatastoreTransaction;
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bigInt = require(\"big-integer\");\nimport { DatastoreModelDescriptor, DatastoreQuery } from \"./model_descriptor\";\nimport {\n  Datastore,\n  DatastoreRequest,\n  Key,\n  Transaction,\n} from \"@google-cloud/datastore\";\nimport { parseMessage } from \"@selfage/message/parser\";\n\n// Should be defined by Datastore but not exported.\nexport type SaveMethod = \"insert\" | \"update\" | \"upsert\";\n\ninterface Entity {\n  key: Key;\n  data: any;\n  excludeFromIndexes: Array<string>;\n  method: SaveMethod;\n}\n\nfunction parseValue<T>(\n  rawValue: any,\n  descriptor: DatastoreModelDescriptor<T>\n): T {\n  let value = parseMessage(rawValue, descriptor.valueDescriptor);\n  (value as any)[descriptor.key] = rawValue[Datastore.KEY].name;\n  return value;\n}\n\nasync function allocateKeys<T>(\n  datastoreRequest: DatastoreRequest,\n  values: Array<T>,\n  descriptor: DatastoreModelDescriptor<T>\n): Promise<Array<T>> {\n  let incompleteKey = new Key({ path: [descriptor.name] });\n  let response = await datastoreRequest.allocateIds(\n    incompleteKey,\n    values.length\n  );\n  let keys = response[0] as Array<Key>;\n  for (let i = 0; i < keys.length; i++) {\n    let uint8Array = bigInt(keys[i].id).toArray(256).value;\n    (values[i] as any)[descriptor.key] =\n      Buffer.from(uint8Array).toString(\"base64\");\n  }\n  return values;\n}\n\nasync function getValuesByKeys<T>(\n  datastoreRequest: DatastoreRequest,\n  keys: Array<string>,\n  descriptor: DatastoreModelDescriptor<T>\n): Promise<Array<T>> {\n  let datastoreKeys = new Array<Key>();\n  for (let key of keys) {\n    datastoreKeys.push(new Key({ path: [descriptor.name, key] }));\n  }\n  let response = await datastoreRequest.get(datastoreKeys);\n  let results = new Array<T>();\n  for (let rawValue of response[0]) {\n    results.push(parseValue(rawValue, descriptor));\n  }\n  return results;\n}\n\nasync function deleteByKeys<T>(\n  datastoreRequest: DatastoreRequest,\n  keys: Array<string>,\n  descriptor: DatastoreModelDescriptor<T>\n): Promise<void> {\n  let datastoreKeys = new Array<Key>();\n  for (let key of keys) {\n    datastoreKeys.push(new Key({ path: [descriptor.name, key] }));\n  }\n  await datastoreRequest.delete(datastoreKeys);\n}\n\nasync function saveValues<T>(\n  datastoreRequest: DatastoreRequest,\n  values: Array<T>,\n  descriptor: DatastoreModelDescriptor<T>,\n  method: SaveMethod\n): Promise<void> {\n  let entities = new Array<Entity>();\n  for (let value of values) {\n    let keyValue = (value as any)[descriptor.key];\n    let key = new Key({\n      path: [descriptor.name, keyValue],\n    });\n    delete (value as any)[descriptor.key];\n    entities.push({\n      key: key,\n      data: value,\n      excludeFromIndexes: descriptor.excludedIndexes,\n      method: method,\n    });\n  }\n  await datastoreRequest.save(entities);\n}\n\nasync function queryValues<T>(\n  datastoreRequest: DatastoreRequest,\n  datastoreQuery: DatastoreQuery<T>\n): Promise<{ values: Array<T>; cursor?: string }> {\n  let query = datastoreRequest.createQuery(datastoreQuery.modelDescriptor.name);\n  if (datastoreQuery.startCursor) {\n    query.start(datastoreQuery.startCursor);\n  }\n  if (datastoreQuery.limit) {\n    query.limit(datastoreQuery.limit);\n  }\n  for (let filter of datastoreQuery.filters) {\n    query.filter(filter.fieldName, filter.operator, filter.fieldValue);\n  }\n  for (let ordering of datastoreQuery.orderings) {\n    query.order(ordering.fieldName, { descending: ordering.descending });\n  }\n  let response = await query.run();\n  let values = new Array<T>();\n  for (let rawValue of response[0]) {\n    values.push(parseValue(rawValue, datastoreQuery.modelDescriptor));\n  }\n  let cursor: string;\n  if (response[1].moreResults !== \"NO_MORE_RESULTS\") {\n    cursor = response[1].endCursor;\n  }\n  return {\n    values,\n    cursor,\n  };\n}\n\nexport class DatastoreClient {\n  public constructor(private datastore: Datastore) {}\n\n  // Use default Datastore constructor.\n  public static create(): DatastoreClient {\n    let datastore = new Datastore();\n    return new DatastoreClient(datastore);\n  }\n\n  public async startTransaction(): Promise<DatastoreTransaction> {\n    let [transaction] = await this.datastore.transaction().run();\n    return new DatastoreTransaction(transaction);\n  }\n\n  public async allocateKeys<T>(\n    values: Array<T>,\n    descriptor: DatastoreModelDescriptor<T>\n  ): Promise<Array<T>> {\n    return allocateKeys(this.datastore, values, descriptor);\n  }\n\n  public async get<T>(\n    keys: Array<string>,\n    descriptor: DatastoreModelDescriptor<T>\n  ): Promise<Array<T>> {\n    return getValuesByKeys(this.datastore, keys, descriptor);\n  }\n\n  public async delete<T>(\n    keys: Array<string>,\n    descriptor: DatastoreModelDescriptor<T>\n  ): Promise<void> {\n    return deleteByKeys(this.datastore, keys, descriptor);\n  }\n\n  public async save<T>(\n    values: Array<T>,\n    descriptor: DatastoreModelDescriptor<T>,\n    method: SaveMethod\n  ): Promise<void> {\n    return saveValues(this.datastore, values, descriptor, method);\n  }\n\n  public async query<T>(\n    datastoreQuery: DatastoreQuery<T>\n  ): Promise<{ values: Array<T>; cursor?: string }> {\n    return queryValues(this.datastore, datastoreQuery);\n  }\n}\n\nexport class DatastoreTransaction {\n  public constructor(private transaction: Transaction) {}\n\n  public async allocateKeys<T>(\n    values: Array<T>,\n    descriptor: DatastoreModelDescriptor<T>\n  ): Promise<Array<T>> {\n    return allocateKeys(this.transaction, values, descriptor);\n  }\n\n  public async get<T>(\n    keys: Array<string>,\n    descriptor: DatastoreModelDescriptor<T>\n  ): Promise<Array<T>> {\n    return getValuesByKeys(this.transaction, keys, descriptor);\n  }\n\n  public async delete<T>(\n    keys: Array<string>,\n    descriptor: DatastoreModelDescriptor<T>\n  ): Promise<void> {\n    return deleteByKeys(this.transaction, keys, descriptor);\n  }\n\n  public async save<T>(\n    values: Array<T>,\n    descriptor: DatastoreModelDescriptor<T>,\n    method: SaveMethod\n  ): Promise<void> {\n    return saveValues(this.transaction, values, descriptor, method);\n  }\n\n  public async query<T>(\n    datastoreQuery: DatastoreQuery<T>\n  ): Promise<{ values: Array<T>; cursor?: string }> {\n    return queryValues(this.transaction, datastoreQuery);\n  }\n\n  public async commit(): Promise<void> {\n    await this.transaction.commit();\n  }\n}\n"]}