@selfage/service_handler
Version:
Http-based service handlers on top of expressjs.
81 lines • 12.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ServiceHandler = exports.HandlerRegister = void 0;
const express = require("express");
const promClient = require("prom-client");
const base_remote_call_handler_1 = require("./base_remote_call_handler");
const cors_allowed_preflight_handler_1 = require("./cors_allowed_preflight_handler");
class HandlerRegister {
constructor(app, baseHandler, serviceDescriptor) {
this.baseHandler = baseHandler;
this.serviceDescriptor = serviceDescriptor;
this.router = express.Router();
this.addedPaths = new Set();
app.use(this.serviceDescriptor.path, this.router);
}
add(remoteCallHandler) {
if (remoteCallHandler.descriptor.service !== this.serviceDescriptor) {
throw new Error(`The remote call handler ${remoteCallHandler.descriptor.name} is defined in service ${remoteCallHandler.descriptor.service.name} but being added to service ${this.serviceDescriptor.name}.`);
}
if (this.addedPaths.has(remoteCallHandler.descriptor.path)) {
throw new Error(`The remote call handler ${remoteCallHandler.descriptor.name} is defined with a path path ${remoteCallHandler.descriptor.path} that's already registered.`);
}
this.addedPaths.add(remoteCallHandler.descriptor.path);
this.router.post(remoteCallHandler.descriptor.path, (req, res) => this.baseHandler.handle(remoteCallHandler, req, res));
return this;
}
}
exports.HandlerRegister = HandlerRegister;
class ServiceHandler {
static create(server, allowOrigin = "*") {
return new ServiceHandler(server, base_remote_call_handler_1.BaseRemoteCallHandler.create(allowOrigin), cors_allowed_preflight_handler_1.CorsAllowedPreflightHandler.create(allowOrigin));
}
constructor(server, baseHandler, corsAllowedPreflightHandler) {
this.server = server;
this.baseHandler = baseHandler;
this.corsAllowedPreflightHandler = corsAllowedPreflightHandler;
this.app = express();
this.server.on("request", this.app);
}
addCorsAllowedPreflightHandler() {
this.app.options("/*", (req, res) => this.corsAllowedPreflightHandler.handle(res));
return this;
}
addMetricsHandler() {
this.app.get("/metricsz", async (req, res) => {
res.setHeader("Content-Type", "text/plain");
res.end(await promClient.register.metrics());
});
return this;
}
addHealthCheckHandler() {
this.app.get("/healthz", (req, res) => {
res.end("OK");
});
return this;
}
addReadinessHandler() {
this.app.get("/readiness", (req, res) => {
res.end("OK");
});
return this;
}
addHandlerRegister(serviceDescriptor) {
return new HandlerRegister(this.app, this.baseHandler, serviceDescriptor);
}
async start(port) {
await new Promise((resolve) => {
this.server.listen(port, () => resolve());
});
console.log(`Server is listening on port ${port}.`);
return this;
}
async stop() {
await new Promise((resolve) => this.server.close(() => resolve()));
console.log(`Server has stopped.`);
// Wait for the server to close all connections.
await new Promise((resolve) => setTimeout(resolve, 1000));
}
}
exports.ServiceHandler = ServiceHandler;
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express = require(\"express\");\nimport http = require(\"http\");\nimport https = require(\"https\");\nimport promClient = require(\"prom-client\");\nimport { BaseRemoteCallHandler } from \"./base_remote_call_handler\";\nimport { CorsAllowedPreflightHandler } from \"./cors_allowed_preflight_handler\";\nimport { ServiceDescriptor } from \"@selfage/service_descriptor\";\nimport { RemoteCallHandlerInterface } from \"@selfage/service_descriptor/remote_call_handler_interface\";\n\nexport class HandlerRegister {\n  private router = express.Router();\n  private addedPaths: Set<string> = new Set();\n\n  public constructor(\n    app: express.Application,\n    private baseHandler: BaseRemoteCallHandler,\n    private serviceDescriptor: ServiceDescriptor,\n  ) {\n    app.use(this.serviceDescriptor.path, this.router);\n  }\n\n  public add(remoteCallHandler: RemoteCallHandlerInterface): this {\n    if (remoteCallHandler.descriptor.service !== this.serviceDescriptor) {\n      throw new Error(\n        `The remote call handler ${remoteCallHandler.descriptor.name} is defined in service ${remoteCallHandler.descriptor.service.name} but being added to service ${this.serviceDescriptor.name}.`,\n      );\n    }\n    if (this.addedPaths.has(remoteCallHandler.descriptor.path)) {\n      throw new Error(\n        `The remote call handler ${remoteCallHandler.descriptor.name} is defined with a path path ${remoteCallHandler.descriptor.path} that's already registered.`,\n      );\n    }\n    this.addedPaths.add(remoteCallHandler.descriptor.path);\n\n    this.router.post(remoteCallHandler.descriptor.path, (req, res) =>\n      this.baseHandler.handle(remoteCallHandler, req, res),\n    );\n    return this;\n  }\n}\n\nexport class ServiceHandler {\n  public static create(\n    server: http.Server | https.Server,\n    allowOrigin: string = \"*\",\n  ): ServiceHandler {\n    return new ServiceHandler(\n      server,\n      BaseRemoteCallHandler.create(allowOrigin),\n      CorsAllowedPreflightHandler.create(allowOrigin),\n    );\n  }\n\n  private app = express();\n\n  public constructor(\n    private server: http.Server | https.Server,\n    private baseHandler: BaseRemoteCallHandler,\n    private corsAllowedPreflightHandler: CorsAllowedPreflightHandler,\n  ) {\n    this.server.on(\"request\", this.app);\n  }\n\n  public addCorsAllowedPreflightHandler(): this {\n    this.app.options(\"/*\", (req, res) =>\n      this.corsAllowedPreflightHandler.handle(res),\n    );\n    return this;\n  }\n\n  public addMetricsHandler(): this {\n    this.app.get(\"/metricsz\", async (req, res) => {\n      res.setHeader(\"Content-Type\", \"text/plain\");\n      res.end(await promClient.register.metrics());\n    });\n    return this;\n  }\n\n  public addHealthCheckHandler(): this {\n    this.app.get(\"/healthz\", (req, res) => {\n      res.end(\"OK\");\n    });\n    return this;\n  }\n\n  public addReadinessHandler(): this {\n    this.app.get(\"/readiness\", (req, res) => {\n      res.end(\"OK\");\n    });\n    return this;\n  }\n\n  public addHandlerRegister(\n    serviceDescriptor: ServiceDescriptor,\n  ): HandlerRegister {\n    return new HandlerRegister(this.app, this.baseHandler, serviceDescriptor);\n  }\n\n  public async start(port: number): Promise<this> {\n    await new Promise<void>((resolve) => {\n      this.server.listen(port, () => resolve());\n    });\n    console.log(`Server is listening on port ${port}.`);\n    return this;\n  }\n\n  public async stop(): Promise<void> {\n    await new Promise<void>((resolve) => this.server.close(() => resolve()));\n    console.log(`Server has stopped.`);\n    // Wait for the server to close all connections.\n    await new Promise((resolve) => setTimeout(resolve, 1000));\n  }\n}\n"]}