@selfage/service_handler
Version:
Http-based service handlers on top of expressjs.
147 lines • 23 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.BaseRemoteCallHandler = void 0;
const getStream = require("get-stream");
const promClient = require("prom-client");
const stream_message_reader_1 = require("./stream_message_reader");
const http_error_1 = require("@selfage/http_error");
const parser_1 = require("@selfage/message/parser");
const serializer_1 = require("@selfage/message/serializer");
const stringifier_1 = require("@selfage/message/stringifier");
const service_descriptor_1 = require("@selfage/service_descriptor");
let TOTAL_COUNTER = new promClient.Counter({
name: "remote_calls_total",
help: "The total number of calls received.",
labelNames: ["path"],
});
let FAILURE_COUNTER = new promClient.Counter({
name: "remote_calls_failure",
help: "The number of failed calls.",
labelNames: ["path", "errorCode"],
});
class BaseRemoteCallHandler {
static create(allowOrigin) {
return new BaseRemoteCallHandler(allowOrigin);
}
constructor(allowOrigin) {
this.allowOrigin = allowOrigin;
}
async handle(remoteCallHandler, req, res) {
TOTAL_COUNTER.inc({
path: remoteCallHandler.descriptor.service.path +
remoteCallHandler.descriptor.path,
});
// Add CORS rules.
res.setHeader("Access-Control-Allow-Origin", this.allowOrigin);
res.setHeader("Access-Control-Allow-Methods", "*");
res.setHeader("Access-Control-Allow-Headers", "*");
let requestId = `${Math.floor(Date.now() / 1000)}-${Math.floor(Math.random() * 10000)}`;
let loggingPrefix = `Request ${requestId}:`;
console.info(`${loggingPrefix} ${req.url}.`);
try {
await this.handleRequest(loggingPrefix, remoteCallHandler, req, res);
}
catch (e) {
console.error(`${loggingPrefix} ${e.stack ?? e.message ?? e}`);
let statusCode = e.statusCode ?? http_error_1.StatusCode.InternalServerError;
FAILURE_COUNTER.inc({
path: remoteCallHandler.descriptor.service.path +
remoteCallHandler.descriptor.path,
errorCode: statusCode,
});
res.sendStatus(statusCode);
await new Promise((resolve) => res.end(resolve));
}
}
async handleRequest(loggingPrefix, remoteCallHandler, req, res) {
let args = [loggingPrefix];
let legacyJsonQuery = false;
if (remoteCallHandler.descriptor.body.messageType) {
let bodyBuffer = await getStream.buffer(req, {
maxBuffer: 1 * 1024 * 1024,
});
if (req.headers["content-type"] === "application/json") {
legacyJsonQuery = true;
let bodyStr = bodyBuffer.toString("utf-8");
args.push(this.parse(loggingPrefix, bodyStr, remoteCallHandler.descriptor.body.messageType, `body`));
}
else {
args.push(this.deserialize(loggingPrefix, bodyBuffer, remoteCallHandler.descriptor.body.messageType, `body`));
}
}
else if (remoteCallHandler.descriptor.body.streamMessageType) {
// NOTE: Doesn't work! Client side requires http2 to enable custom streaming with unspecified content length.
let streamReader = new stream_message_reader_1.StreamMessageReader(req, remoteCallHandler.descriptor.body.streamMessageType);
args.push(streamReader);
}
else if (remoteCallHandler.descriptor.body.primitiveType ===
service_descriptor_1.PrimitveTypeForBody.BYTES) {
args.push(req);
}
else {
throw (0, http_error_1.newInternalServerErrorError)(`Unsupported server request body.`);
}
if (remoteCallHandler.descriptor.metadata) {
args.push(this.destringify(loggingPrefix, req.query[remoteCallHandler.descriptor.metadata.key], remoteCallHandler.descriptor.metadata.type, `metadata`));
}
if (remoteCallHandler.descriptor.authKey) {
let authStr = req.header(remoteCallHandler.descriptor.authKey);
if (!authStr) {
throw (0, http_error_1.newUnauthorizedError)(`No auth string is found in the header ${remoteCallHandler.descriptor.authKey}.`);
}
args.push(authStr);
}
let response = await remoteCallHandler.handle(...args);
await new Promise((resolve) => {
if (legacyJsonQuery) {
res.setHeader("Content-Type", "application/json");
res.end(JSON.stringify(response), resolve);
}
else {
res.setHeader("Content-Type", "application/octet-stream");
res.end((0, serializer_1.serializeMessage)(response, remoteCallHandler.descriptor.response.messageType), resolve);
}
});
}
destringify(loggingPrefix, value, messageDescriptor, what) {
let ret;
try {
ret = (0, stringifier_1.destringifyMessage)(value, messageDescriptor);
}
catch (e) {
throw (0, http_error_1.newBadRequestError)(`Unable to destringify ${what}. Raw string: ${value}.`, e);
}
if (!ret) {
throw (0, http_error_1.newBadRequestError)(`${what} is empty.`);
}
return ret;
}
deserialize(loggingPrefix, value, messageDescriptor, what) {
let ret;
try {
ret = (0, serializer_1.deserializeMessage)(value, messageDescriptor);
}
catch (e) {
throw (0, http_error_1.newBadRequestError)(`Unable to deserialize ${what}. Raw value as base64: ${Buffer.from(value).toString("base64")}.`, e);
}
if (!ret) {
throw (0, http_error_1.newBadRequestError)(`${what} is empty.`);
}
return ret;
}
parse(loggingPrefix, value, messageDescriptor, what) {
let ret;
try {
ret = (0, parser_1.parseMessage)(JSON.parse(value), messageDescriptor);
}
catch (e) {
throw (0, http_error_1.newBadRequestError)(`Unable to parse ${what}. Raw value: ${value}.`, e);
}
if (!ret) {
throw (0, http_error_1.newBadRequestError)(`${what} is empty.`);
}
return ret;
}
}
exports.BaseRemoteCallHandler = BaseRemoteCallHandler;
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express = require(\"express\");\nimport getStream = require(\"get-stream\");\nimport promClient = require(\"prom-client\");\nimport { StreamMessageReader } from \"./stream_message_reader\";\nimport {\n  StatusCode,\n  newBadRequestError,\n  newInternalServerErrorError,\n  newUnauthorizedError,\n} from \"@selfage/http_error\";\nimport { MessageDescriptor } from \"@selfage/message/descriptor\";\nimport { parseMessage } from \"@selfage/message/parser\";\nimport {\n  deserializeMessage,\n  serializeMessage,\n} from \"@selfage/message/serializer\";\nimport { destringifyMessage } from \"@selfage/message/stringifier\";\nimport { PrimitveTypeForBody } from \"@selfage/service_descriptor\";\nimport { RemoteCallHandlerInterface } from \"@selfage/service_descriptor/remote_call_handler_interface\";\n\nlet TOTAL_COUNTER = new promClient.Counter({\n  name: \"remote_calls_total\",\n  help: \"The total number of calls received.\",\n  labelNames: [\"path\"],\n});\nlet FAILURE_COUNTER = new promClient.Counter({\n  name: \"remote_calls_failure\",\n  help: \"The number of failed calls.\",\n  labelNames: [\"path\", \"errorCode\"],\n});\n\nexport class BaseRemoteCallHandler {\n  public static create(allowOrigin: string): BaseRemoteCallHandler {\n    return new BaseRemoteCallHandler(allowOrigin);\n  }\n\n  public constructor(private allowOrigin: string) {}\n\n  public async handle(\n    remoteCallHandler: RemoteCallHandlerInterface,\n    req: express.Request,\n    res: express.Response,\n  ): Promise<void> {\n    TOTAL_COUNTER.inc({\n      path:\n        remoteCallHandler.descriptor.service.path +\n        remoteCallHandler.descriptor.path,\n    });\n    // Add CORS rules.\n    res.setHeader(\"Access-Control-Allow-Origin\", this.allowOrigin);\n    res.setHeader(\"Access-Control-Allow-Methods\", \"*\");\n    res.setHeader(\"Access-Control-Allow-Headers\", \"*\");\n\n    let requestId = `${Math.floor(Date.now() / 1000)}-${Math.floor(\n      Math.random() * 10000,\n    )}`;\n    let loggingPrefix = `Request ${requestId}:`;\n    console.info(`${loggingPrefix} ${req.url}.`);\n\n    try {\n      await this.handleRequest(loggingPrefix, remoteCallHandler, req, res);\n    } catch (e) {\n      console.error(`${loggingPrefix} ${e.stack ?? e.message ?? e}`);\n      let statusCode = e.statusCode ?? StatusCode.InternalServerError;\n      FAILURE_COUNTER.inc({\n        path:\n          remoteCallHandler.descriptor.service.path +\n          remoteCallHandler.descriptor.path,\n        errorCode: statusCode,\n      });\n      res.sendStatus(statusCode);\n      await new Promise<void>((resolve) => res.end(resolve));\n    }\n  }\n\n  private async handleRequest(\n    loggingPrefix: string,\n    remoteCallHandler: RemoteCallHandlerInterface,\n    req: express.Request,\n    res: express.Response,\n  ): Promise<void> {\n    let args: any[] = [loggingPrefix];\n    let legacyJsonQuery = false;\n    if (remoteCallHandler.descriptor.body.messageType) {\n      let bodyBuffer = await getStream.buffer(req, {\n        maxBuffer: 1 * 1024 * 1024,\n      });\n      if (req.headers[\"content-type\"] === \"application/json\") {\n        legacyJsonQuery = true;\n        let bodyStr = bodyBuffer.toString(\"utf-8\");\n        args.push(\n          this.parse(\n            loggingPrefix,\n            bodyStr,\n            remoteCallHandler.descriptor.body.messageType,\n            `body`,\n          ),\n        );\n      } else {\n        args.push(\n          this.deserialize(\n            loggingPrefix,\n            bodyBuffer,\n            remoteCallHandler.descriptor.body.messageType,\n            `body`,\n          ),\n        );\n      }\n    } else if (remoteCallHandler.descriptor.body.streamMessageType) {\n      // NOTE: Doesn't work! Client side requires http2 to enable custom streaming with unspecified content length.\n      let streamReader = new StreamMessageReader(\n        req,\n        remoteCallHandler.descriptor.body.streamMessageType,\n      );\n      args.push(streamReader);\n    } else if (\n      remoteCallHandler.descriptor.body.primitiveType ===\n      PrimitveTypeForBody.BYTES\n    ) {\n      args.push(req);\n    } else {\n      throw newInternalServerErrorError(`Unsupported server request body.`);\n    }\n\n    if (remoteCallHandler.descriptor.metadata) {\n      args.push(\n        this.destringify(\n          loggingPrefix,\n          req.query[remoteCallHandler.descriptor.metadata.key] as string,\n          remoteCallHandler.descriptor.metadata.type,\n          `metadata`,\n        ),\n      );\n    }\n\n    if (remoteCallHandler.descriptor.authKey) {\n      let authStr = req.header(remoteCallHandler.descriptor.authKey);\n      if (!authStr) {\n        throw newUnauthorizedError(\n          `No auth string is found in the header ${remoteCallHandler.descriptor.authKey}.`,\n        );\n      }\n      args.push(authStr);\n    }\n    let response = await remoteCallHandler.handle(...args);\n\n    await new Promise<void>((resolve) => {\n      if (legacyJsonQuery) {\n        res.setHeader(\"Content-Type\", \"application/json\");\n        res.end(JSON.stringify(response), resolve);\n      } else {\n        res.setHeader(\"Content-Type\", \"application/octet-stream\");\n        res.end(\n          serializeMessage(\n            response,\n            remoteCallHandler.descriptor.response.messageType,\n          ),\n          resolve,\n        );\n      }\n    });\n  }\n\n  private destringify(\n    loggingPrefix: string,\n    value: string,\n    messageDescriptor: MessageDescriptor<any>,\n    what: string,\n  ): any {\n    let ret: any;\n    try {\n      ret = destringifyMessage(value, messageDescriptor);\n    } catch (e) {\n      throw newBadRequestError(\n        `Unable to destringify ${what}. Raw string: ${value}.`,\n        e,\n      );\n    }\n    if (!ret) {\n      throw newBadRequestError(`${what} is empty.`);\n    }\n    return ret;\n  }\n\n  private deserialize(\n    loggingPrefix: string,\n    value: Uint8Array,\n    messageDescriptor: MessageDescriptor<any>,\n    what: string,\n  ): any {\n    let ret: any;\n    try {\n      ret = deserializeMessage(value, messageDescriptor);\n    } catch (e) {\n      throw newBadRequestError(\n        `Unable to deserialize ${what}. Raw value as base64: ${Buffer.from(value).toString(\"base64\")}.`,\n        e,\n      );\n    }\n    if (!ret) {\n      throw newBadRequestError(`${what} is empty.`);\n    }\n    return ret;\n  }\n\n  private parse(\n    loggingPrefix: string,\n    value: string,\n    messageDescriptor: MessageDescriptor<any>,\n    what: string,\n  ): any {\n    let ret: any;\n    try {\n      ret = parseMessage(JSON.parse(value), messageDescriptor);\n    } catch (e) {\n      throw newBadRequestError(\n        `Unable to parse ${what}. Raw value: ${value}.`,\n        e,\n      );\n    }\n    if (!ret) {\n      throw newBadRequestError(`${what} is empty.`);\n    }\n    return ret;\n  }\n}\n"]}