Placeholder for the first pattern #48
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| { | ||
| "name": "restate-ts-template", | ||
| "version": "0.0.1", | ||
| "description": "Template for JavaScript/TypeScript services running with Restate (https://github.com/restatedev/) ", | ||
| "main": "app.js", | ||
| "type": "commonjs", | ||
| "scripts": { | ||
| "build": "tsc --noEmitOnError", | ||
| "prebundle": "rm -rf dist", | ||
| "bundle": "esbuild src/app.ts --bundle --minify --sourcemap --platform=node --target=es2020 --outfile=dist/index.js", | ||
| "postbundle": "cd dist && zip -r index.zip index.js*", | ||
| "app": "node ./dist/app.js", | ||
| "app-dev": "ts-node-dev --watch ./src --respawn --transpile-only ./src/app.ts" | ||
| }, | ||
| "dependencies": { | ||
| "@restatedev/restate-sdk": "^0.5.1" | ||
| }, | ||
| "devDependencies": { | ||
| "ts-node-dev": "^1.1.1", | ||
| "typescript": "^5.0.2", | ||
| "esbuild": "^0.18.12" | ||
| } | ||
| } |
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| import * as restate from "@restatedev/restate-sdk"; | ||
| import { randomUUID } from "crypto"; | ||
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| // ----------------- ----------------- | ||
| // Idempotency Tokens / Unique Tokens | ||
| // ----------------- ----------------- | ||
| // | ||
| // Idempotency tokens are useful when trying to make external calls idempotent, | ||
| // so that retries do not result in applying a change multiple times. | ||
| // | ||
| // One of the most famous examples for that is the Stripe idempotency token, | ||
| // which one attaches to a payment API call to ensure the payment is made | ||
| // just once. | ||
| // | ||
| // Generating idempotency tokens reliably can be surprisingly tricky, especially | ||
| // when they should be stable under various forms of failures or network partition | ||
| // scenarios. | ||
| // | ||
| // Restate makes this dead simple, in various different ways: | ||
| // | ||
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| // ---------------------------------------------------------------------------- | ||
| // ** option 1** use request parameter | ||
| // ---------------------------------------------------------------------------- | ||
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| // Restate persists the request parameter and ensures that all retries of the | ||
| // 'makeIdempotentCall1()' function get that persisted parameter. | ||
| // If a suitable token is in the request parameter, it is safe to use it | ||
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| async function makeIdempotentCall1(ctx: restate.RpcContext, request: any) { | ||
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| await ctx.sideEffect(() => api.makeCall(request, request.idempotencyToken)); | ||
| } | ||
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| // ---------------------------------------------------------------------------- | ||
| // ** option 2** stable deterministic random | ||
| // ---------------------------------------------------------------------------- | ||
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| // Restate offers deterministic Random number generators that are seeded with | ||
| // the durable invocation ID. This random number generator is guaranteed to | ||
| // always return the same value across all retries of the invocation, | ||
| // regardless of crashes/failover of either the service or the Restate runtime. | ||
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| async function makeIdempotentCall2(ctx: restate.RpcContext, request: any) { | ||
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| const idempotencyToken = ctx.rand.uuidv4(); | ||
| await ctx.sideEffect(() => api.makeCall(request, idempotencyToken)); | ||
| } | ||
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| // ---------------------------------------------------------------------------- | ||
| // ** option 3** Side effect UUID | ||
| // ---------------------------------------------------------------------------- | ||
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| // Side effects are guaranteed to agree on one specific return value before that | ||
| // value is passed to the application. The returned value will never change across | ||
| // retries of the invocation, regardless of crashes/failover of either the service | ||
| // or the Restate runtime. | ||
| // Note that this is more expensive than the 'ctx.rand.uuidv4()' variant, because | ||
| // it requires an additional consensus operation by the Restate runtime. | ||
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| async function makeIdempotentCall3(ctx: restate.RpcContext, request: any) { | ||
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| const idempotencyToken = await ctx.sideEffect(async () => randomUUID()) | ||
|
There was a problem hiding this comment. I think we can now use There was a problem hiding this comment. That's in the previous example, in option (2) |
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| await ctx.sideEffect(() => api.makeCall(request, idempotencyToken)); | ||
| } | ||
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| // ---------------------------------------------------------------------------- | ||
| // ** option 4** Reserve token in external system | ||
| // ---------------------------------------------------------------------------- | ||
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| // In some cases, it might be required to make an actual call to another API | ||
| // to reserve a token first. This can also be achieved with a sideEffect. | ||
| // | ||
| // While there may be cases where multiple calls to the tokens reservation API | ||
| // happen (in case of failures in the small window between the call and the time | ||
| // when the sideEffect commits), one value will ultimately be committed by Restate | ||
| // as the sideEffect's result and that same value will be seen by all executions | ||
| // and retries of that function invocation. | ||
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| async function makeIdempotentCall4(ctx: restate.RpcContext, request: any) { | ||
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| const idempotencyToken = await ctx.sideEffect(async () => { | ||
| // make call to external system to reserve a token | ||
| const response = await fetch('https://theSystemToReserveTheTokenIn:1234/api/tokens'); | ||
| if (!response.ok) { | ||
| // this will lead to automatic retries | ||
| throw new Error(`HTTP error! status: ${response.status}`); | ||
| } | ||
| return await response.text(); | ||
| }); | ||
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| await ctx.sideEffect(() => api.makeCall(request, idempotencyToken)); | ||
| } | ||
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| // ---------------------------------------------------------------------------- | ||
| // MOCKS FOR THE PATTERNS | ||
| // ---------------------------------------------------------------------------- | ||
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| const api = { | ||
| makeCall: async (_request: any, _idempotencyToken: String) => Promise.resolve() | ||
| } | ||
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| { | ||
| "compilerOptions": { | ||
| /* Visit https://aka.ms/tsconfig to read more about this file */ | ||
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| /* Projects */ | ||
| // "incremental": true, /* Save .tsbuildinfo files to allow for incremental compilation of projects. */ | ||
| // "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */ | ||
| // "tsBuildInfoFile": "./.tsbuildinfo", /* Specify the path to .tsbuildinfo incremental compilation file. */ | ||
| // "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects. */ | ||
| // "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */ | ||
| // "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */ | ||
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| /* Language and Environment */ | ||
| "target": "esnext", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */ | ||
| "lib": ["esnext"], /* Specify a set of bundled library declaration files that describe the target runtime environment. */ | ||
| // "jsx": "preserve", /* Specify what JSX code is generated. */ | ||
| // "experimentalDecorators": true, /* Enable experimental support for legacy experimental decorators. */ | ||
| // "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */ | ||
| // "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */ | ||
| // "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */ | ||
| // "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */ | ||
| // "reactNamespace": "", /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */ | ||
| // "noLib": true, /* Disable including any library files, including the default lib.d.ts. */ | ||
| // "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */ | ||
| // "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */ | ||
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| /* Modules */ | ||
| "module": "commonjs", /* Specify what module code is generated. */ | ||
| // "rootDir": "./", /* Specify the root folder within your source files. */ | ||
| // "moduleResolution": "node10", /* Specify how TypeScript looks up a file from a given module specifier. */ | ||
| // "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */ | ||
| // "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */ | ||
| // "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */ | ||
| // "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */ | ||
| // "types": [], /* Specify type package names to be included without being referenced in a source file. */ | ||
| // "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */ | ||
| // "moduleSuffixes": [], /* List of file name suffixes to search when resolving a module. */ | ||
| // "allowImportingTsExtensions": true, /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */ | ||
| // "resolvePackageJsonExports": true, /* Use the package.json 'exports' field when resolving package imports. */ | ||
| // "resolvePackageJsonImports": true, /* Use the package.json 'imports' field when resolving imports. */ | ||
| // "customConditions": [], /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */ | ||
| // "resolveJsonModule": true, /* Enable importing .json files. */ | ||
| // "allowArbitraryExtensions": true, /* Enable importing files with any extension, provided a declaration file is present. */ | ||
| // "noResolve": true, /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */ | ||
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| /* JavaScript Support */ | ||
| "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */ | ||
| // "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */ | ||
| // "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */ | ||
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| /* Emit */ | ||
| "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */ | ||
| "declarationMap": true, /* Create sourcemaps for d.ts files. */ | ||
| "sourceMap": true, /* Create source map files for emitted JavaScript files. */ | ||
| "outDir": "./dist", /* Specify an output folder for all emitted files. */ | ||
| // "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */ | ||
| // "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */ | ||
| // "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */ | ||
| // "removeComments": true, /* Disable emitting comments. */ | ||
| // "noEmit": true, /* Disable emitting files from a compilation. */ | ||
| // "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */ | ||
| // "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types. */ | ||
| // "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */ | ||
| // "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */ | ||
| // "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */ | ||
| // "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */ | ||
| // "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */ | ||
| // "newLine": "crlf", /* Set the newline character for emitting files. */ | ||
| // "stripInternal": true, /* Disable emitting declarations that have '@internal' in their JSDoc comments. */ | ||
| // "noEmitHelpers": true, /* Disable generating custom helper functions like '__extends' in compiled output. */ | ||
| // "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */ | ||
| // "preserveConstEnums": true, /* Disable erasing 'const enum' declarations in generated code. */ | ||
| // "declarationDir": "./", /* Specify the output directory for generated declaration files. */ | ||
| // "preserveValueImports": true, /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */ | ||
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| /* Interop Constraints */ | ||
| "esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */ | ||
| "forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */ | ||
| "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */ | ||
| // "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */ | ||
| // "verbatimModuleSyntax": true, /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */ | ||
| // "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */ | ||
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| /* Type Checking */ | ||
| "strict": true, /* Enable all strict type-checking options. */ | ||
| // "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied 'any' type. */ | ||
| // "strictNullChecks": true, /* When type checking, take into account 'null' and 'undefined'. */ | ||
| // "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */ | ||
| // "strictBindCallApply": true, /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */ | ||
| // "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */ | ||
| // "noImplicitThis": true, /* Enable error reporting when 'this' is given the type 'any'. */ | ||
| // "useUnknownInCatchVariables": true, /* Default catch clause variables as 'unknown' instead of 'any'. */ | ||
| // "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */ | ||
| // "noUnusedLocals": true, /* Enable error reporting when local variables aren't read. */ | ||
| // "noUnusedParameters": true, /* Raise an error when a function parameter isn't read. */ | ||
| // "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */ | ||
| // "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */ | ||
| // "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */ | ||
| // "noUncheckedIndexedAccess": true, /* Add 'undefined' to a type when accessed using an index. */ | ||
| // "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */ | ||
| // "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type. */ | ||
| // "allowUnusedLabels": true, /* Disable error reporting for unused labels. */ | ||
| // "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */ | ||
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| /* Completeness */ | ||
| "skipLibCheck": true, /* Skip type checking all .d.ts files. */ | ||
| "skipDefaultLibCheck": true /* Skip type checking .d.ts files that are included with TypeScript. */ | ||
| }, | ||
| "include": ["src/"] | ||
| } |
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Isn't it more common to use
uuidv4instead ofcrypto?There was a problem hiding this comment.
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maybe, I really don't know. I often use
cryptobecause it is built-in, so no dependency needed.uuidv4needs to install and package additional dependencies.