431 lines
17 KiB
JavaScript
431 lines
17 KiB
JavaScript
"use strict";
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/*
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* Copyright 2019 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.extractAndSelectServiceConfig = exports.validateServiceConfig = exports.validateRetryThrottling = void 0;
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/* This file implements gRFC A2 and the service config spec:
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* https://github.com/grpc/proposal/blob/master/A2-service-configs-in-dns.md
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* https://github.com/grpc/grpc/blob/master/doc/service_config.md. Each
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* function here takes an object with unknown structure and returns its
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* specific object type if the input has the right structure, and throws an
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* error otherwise. */
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/* The any type is purposely used here. All functions validate their input at
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* runtime */
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/* eslint-disable @typescript-eslint/no-explicit-any */
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const os = require("os");
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const constants_1 = require("./constants");
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/**
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* Recognizes a number with up to 9 digits after the decimal point, followed by
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* an "s", representing a number of seconds.
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*/
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const DURATION_REGEX = /^\d+(\.\d{1,9})?s$/;
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/**
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* Client language name used for determining whether this client matches a
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* `ServiceConfigCanaryConfig`'s `clientLanguage` list.
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*/
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const CLIENT_LANGUAGE_STRING = 'node';
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function validateName(obj) {
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// In this context, and unset field and '' are considered the same
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if ('service' in obj && obj.service !== '') {
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if (typeof obj.service !== 'string') {
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throw new Error(`Invalid method config name: invalid service: expected type string, got ${typeof obj.service}`);
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}
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if ('method' in obj && obj.method !== '') {
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if (typeof obj.method !== 'string') {
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throw new Error(`Invalid method config name: invalid method: expected type string, got ${typeof obj.service}`);
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}
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return {
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service: obj.service,
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method: obj.method,
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};
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}
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else {
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return {
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service: obj.service,
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};
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}
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}
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else {
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if ('method' in obj && obj.method !== undefined) {
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throw new Error(`Invalid method config name: method set with empty or unset service`);
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}
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return {};
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}
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}
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function validateRetryPolicy(obj) {
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if (!('maxAttempts' in obj) ||
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!Number.isInteger(obj.maxAttempts) ||
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obj.maxAttempts < 2) {
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throw new Error('Invalid method config retry policy: maxAttempts must be an integer at least 2');
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}
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if (!('initialBackoff' in obj) ||
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typeof obj.initialBackoff !== 'string' ||
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!DURATION_REGEX.test(obj.initialBackoff)) {
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throw new Error('Invalid method config retry policy: initialBackoff must be a string consisting of a positive integer followed by s');
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}
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if (!('maxBackoff' in obj) ||
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typeof obj.maxBackoff !== 'string' ||
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!DURATION_REGEX.test(obj.maxBackoff)) {
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throw new Error('Invalid method config retry policy: maxBackoff must be a string consisting of a positive integer followed by s');
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}
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if (!('backoffMultiplier' in obj) ||
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typeof obj.backoffMultiplier !== 'number' ||
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obj.backoffMultiplier <= 0) {
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throw new Error('Invalid method config retry policy: backoffMultiplier must be a number greater than 0');
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}
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if (!('retryableStatusCodes' in obj && Array.isArray(obj.retryableStatusCodes))) {
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throw new Error('Invalid method config retry policy: retryableStatusCodes is required');
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}
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if (obj.retryableStatusCodes.length === 0) {
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throw new Error('Invalid method config retry policy: retryableStatusCodes must be non-empty');
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}
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for (const value of obj.retryableStatusCodes) {
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if (typeof value === 'number') {
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if (!Object.values(constants_1.Status).includes(value)) {
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throw new Error('Invalid method config retry policy: retryableStatusCodes value not in status code range');
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}
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}
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else if (typeof value === 'string') {
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if (!Object.values(constants_1.Status).includes(value.toUpperCase())) {
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throw new Error('Invalid method config retry policy: retryableStatusCodes value not a status code name');
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}
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}
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else {
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throw new Error('Invalid method config retry policy: retryableStatusCodes value must be a string or number');
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}
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}
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return {
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maxAttempts: obj.maxAttempts,
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initialBackoff: obj.initialBackoff,
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maxBackoff: obj.maxBackoff,
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backoffMultiplier: obj.backoffMultiplier,
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retryableStatusCodes: obj.retryableStatusCodes,
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};
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}
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function validateHedgingPolicy(obj) {
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if (!('maxAttempts' in obj) ||
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!Number.isInteger(obj.maxAttempts) ||
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obj.maxAttempts < 2) {
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throw new Error('Invalid method config hedging policy: maxAttempts must be an integer at least 2');
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}
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if ('hedgingDelay' in obj &&
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(typeof obj.hedgingDelay !== 'string' ||
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!DURATION_REGEX.test(obj.hedgingDelay))) {
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throw new Error('Invalid method config hedging policy: hedgingDelay must be a string consisting of a positive integer followed by s');
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}
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if ('nonFatalStatusCodes' in obj && Array.isArray(obj.nonFatalStatusCodes)) {
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for (const value of obj.nonFatalStatusCodes) {
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if (typeof value === 'number') {
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if (!Object.values(constants_1.Status).includes(value)) {
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throw new Error('Invlid method config hedging policy: nonFatalStatusCodes value not in status code range');
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}
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}
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else if (typeof value === 'string') {
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if (!Object.values(constants_1.Status).includes(value.toUpperCase())) {
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throw new Error('Invlid method config hedging policy: nonFatalStatusCodes value not a status code name');
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}
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}
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else {
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throw new Error('Invlid method config hedging policy: nonFatalStatusCodes value must be a string or number');
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}
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}
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}
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const result = {
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maxAttempts: obj.maxAttempts,
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};
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if (obj.hedgingDelay) {
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result.hedgingDelay = obj.hedgingDelay;
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}
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if (obj.nonFatalStatusCodes) {
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result.nonFatalStatusCodes = obj.nonFatalStatusCodes;
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}
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return result;
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}
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function validateMethodConfig(obj) {
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var _a;
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const result = {
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name: [],
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};
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if (!('name' in obj) || !Array.isArray(obj.name)) {
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throw new Error('Invalid method config: invalid name array');
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}
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for (const name of obj.name) {
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result.name.push(validateName(name));
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}
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if ('waitForReady' in obj) {
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if (typeof obj.waitForReady !== 'boolean') {
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throw new Error('Invalid method config: invalid waitForReady');
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}
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result.waitForReady = obj.waitForReady;
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}
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if ('timeout' in obj) {
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if (typeof obj.timeout === 'object') {
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if (!('seconds' in obj.timeout) ||
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!(typeof obj.timeout.seconds === 'number')) {
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throw new Error('Invalid method config: invalid timeout.seconds');
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}
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if (!('nanos' in obj.timeout) ||
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!(typeof obj.timeout.nanos === 'number')) {
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throw new Error('Invalid method config: invalid timeout.nanos');
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}
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result.timeout = obj.timeout;
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}
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else if (typeof obj.timeout === 'string' &&
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DURATION_REGEX.test(obj.timeout)) {
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const timeoutParts = obj.timeout
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.substring(0, obj.timeout.length - 1)
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.split('.');
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result.timeout = {
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seconds: timeoutParts[0] | 0,
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nanos: ((_a = timeoutParts[1]) !== null && _a !== void 0 ? _a : 0) | 0,
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};
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}
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else {
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throw new Error('Invalid method config: invalid timeout');
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}
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}
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if ('maxRequestBytes' in obj) {
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if (typeof obj.maxRequestBytes !== 'number') {
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throw new Error('Invalid method config: invalid maxRequestBytes');
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}
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result.maxRequestBytes = obj.maxRequestBytes;
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}
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if ('maxResponseBytes' in obj) {
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if (typeof obj.maxResponseBytes !== 'number') {
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throw new Error('Invalid method config: invalid maxRequestBytes');
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}
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result.maxResponseBytes = obj.maxResponseBytes;
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}
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if ('retryPolicy' in obj) {
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if ('hedgingPolicy' in obj) {
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throw new Error('Invalid method config: retryPolicy and hedgingPolicy cannot both be specified');
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}
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else {
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result.retryPolicy = validateRetryPolicy(obj.retryPolicy);
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}
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}
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else if ('hedgingPolicy' in obj) {
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result.hedgingPolicy = validateHedgingPolicy(obj.hedgingPolicy);
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}
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return result;
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}
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function validateRetryThrottling(obj) {
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if (!('maxTokens' in obj) ||
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typeof obj.maxTokens !== 'number' ||
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obj.maxTokens <= 0 ||
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obj.maxTokens > 1000) {
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throw new Error('Invalid retryThrottling: maxTokens must be a number in (0, 1000]');
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}
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if (!('tokenRatio' in obj) ||
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typeof obj.tokenRatio !== 'number' ||
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obj.tokenRatio <= 0) {
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throw new Error('Invalid retryThrottling: tokenRatio must be a number greater than 0');
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}
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return {
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maxTokens: +obj.maxTokens.toFixed(3),
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tokenRatio: +obj.tokenRatio.toFixed(3),
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};
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}
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exports.validateRetryThrottling = validateRetryThrottling;
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function validateLoadBalancingConfig(obj) {
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if (!(typeof obj === 'object' && obj !== null)) {
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throw new Error(`Invalid loadBalancingConfig: unexpected type ${typeof obj}`);
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}
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const keys = Object.keys(obj);
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if (keys.length > 1) {
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throw new Error(`Invalid loadBalancingConfig: unexpected multiple keys ${keys}`);
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}
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if (keys.length === 0) {
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throw new Error('Invalid loadBalancingConfig: load balancing policy name required');
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}
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return {
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[keys[0]]: obj[keys[0]],
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};
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}
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function validateServiceConfig(obj) {
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const result = {
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loadBalancingConfig: [],
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methodConfig: [],
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};
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if ('loadBalancingPolicy' in obj) {
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if (typeof obj.loadBalancingPolicy === 'string') {
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result.loadBalancingPolicy = obj.loadBalancingPolicy;
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}
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else {
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throw new Error('Invalid service config: invalid loadBalancingPolicy');
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}
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}
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if ('loadBalancingConfig' in obj) {
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if (Array.isArray(obj.loadBalancingConfig)) {
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for (const config of obj.loadBalancingConfig) {
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result.loadBalancingConfig.push(validateLoadBalancingConfig(config));
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}
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}
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else {
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throw new Error('Invalid service config: invalid loadBalancingConfig');
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}
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}
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if ('methodConfig' in obj) {
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if (Array.isArray(obj.methodConfig)) {
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for (const methodConfig of obj.methodConfig) {
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result.methodConfig.push(validateMethodConfig(methodConfig));
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}
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}
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}
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if ('retryThrottling' in obj) {
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result.retryThrottling = validateRetryThrottling(obj.retryThrottling);
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}
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// Validate method name uniqueness
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const seenMethodNames = [];
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for (const methodConfig of result.methodConfig) {
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for (const name of methodConfig.name) {
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for (const seenName of seenMethodNames) {
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if (name.service === seenName.service &&
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name.method === seenName.method) {
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throw new Error(`Invalid service config: duplicate name ${name.service}/${name.method}`);
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}
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}
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seenMethodNames.push(name);
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}
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}
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return result;
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}
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exports.validateServiceConfig = validateServiceConfig;
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function validateCanaryConfig(obj) {
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if (!('serviceConfig' in obj)) {
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throw new Error('Invalid service config choice: missing service config');
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}
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const result = {
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serviceConfig: validateServiceConfig(obj.serviceConfig),
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};
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if ('clientLanguage' in obj) {
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if (Array.isArray(obj.clientLanguage)) {
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result.clientLanguage = [];
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for (const lang of obj.clientLanguage) {
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if (typeof lang === 'string') {
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result.clientLanguage.push(lang);
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}
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else {
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throw new Error('Invalid service config choice: invalid clientLanguage');
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}
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}
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}
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else {
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throw new Error('Invalid service config choice: invalid clientLanguage');
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}
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}
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if ('clientHostname' in obj) {
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if (Array.isArray(obj.clientHostname)) {
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result.clientHostname = [];
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for (const lang of obj.clientHostname) {
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if (typeof lang === 'string') {
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result.clientHostname.push(lang);
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}
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else {
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throw new Error('Invalid service config choice: invalid clientHostname');
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}
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}
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}
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else {
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throw new Error('Invalid service config choice: invalid clientHostname');
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}
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}
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if ('percentage' in obj) {
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if (typeof obj.percentage === 'number' &&
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0 <= obj.percentage &&
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obj.percentage <= 100) {
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result.percentage = obj.percentage;
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}
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else {
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throw new Error('Invalid service config choice: invalid percentage');
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}
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}
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// Validate that no unexpected fields are present
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const allowedFields = [
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'clientLanguage',
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'percentage',
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'clientHostname',
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'serviceConfig',
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];
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for (const field in obj) {
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if (!allowedFields.includes(field)) {
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throw new Error(`Invalid service config choice: unexpected field ${field}`);
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}
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}
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return result;
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}
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function validateAndSelectCanaryConfig(obj, percentage) {
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if (!Array.isArray(obj)) {
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throw new Error('Invalid service config list');
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}
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for (const config of obj) {
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const validatedConfig = validateCanaryConfig(config);
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/* For each field, we check if it is present, then only discard the
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* config if the field value does not match the current client */
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if (typeof validatedConfig.percentage === 'number' &&
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percentage > validatedConfig.percentage) {
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continue;
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}
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if (Array.isArray(validatedConfig.clientHostname)) {
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let hostnameMatched = false;
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for (const hostname of validatedConfig.clientHostname) {
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if (hostname === os.hostname()) {
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hostnameMatched = true;
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}
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}
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if (!hostnameMatched) {
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continue;
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}
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}
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if (Array.isArray(validatedConfig.clientLanguage)) {
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let languageMatched = false;
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for (const language of validatedConfig.clientLanguage) {
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if (language === CLIENT_LANGUAGE_STRING) {
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languageMatched = true;
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}
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}
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if (!languageMatched) {
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continue;
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}
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}
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return validatedConfig.serviceConfig;
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}
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throw new Error('No matching service config found');
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}
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/**
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* Find the "grpc_config" record among the TXT records, parse its value as JSON, validate its contents,
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* and select a service config with selection fields that all match this client. Most of these steps
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* can fail with an error; the caller must handle any errors thrown this way.
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* @param txtRecord The TXT record array that is output from a successful call to dns.resolveTxt
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* @param percentage A number chosen from the range [0, 100) that is used to select which config to use
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* @return The service configuration to use, given the percentage value, or null if the service config
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* data has a valid format but none of the options match the current client.
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*/
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function extractAndSelectServiceConfig(txtRecord, percentage) {
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for (const record of txtRecord) {
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if (record.length > 0 && record[0].startsWith('grpc_config=')) {
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/* Treat the list of strings in this record as a single string and remove
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* "grpc_config=" from the beginning. The rest should be a JSON string */
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const recordString = record.join('').substring('grpc_config='.length);
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const recordJson = JSON.parse(recordString);
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return validateAndSelectCanaryConfig(recordJson, percentage);
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}
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}
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return null;
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}
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exports.extractAndSelectServiceConfig = extractAndSelectServiceConfig;
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//# sourceMappingURL=service-config.js.map
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