Add deadline examples

Author: murgatroid99

examples/deadline/client.js

@@ -0,0 +1,92 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+const grpc = require('@grpc/grpc-js');
+const protoLoader = require('@grpc/proto-loader');
+const parseArgs = require('minimist');
+
+const PROTO_PATH = __dirname + '/../protos/echo.proto';
+
+const packageDefinition = protoLoader.loadSync(
+  PROTO_PATH,
+  {keepCase: true,
+   longs: String,
+   enums: String,
+   defaults: true,
+   oneofs: true
+  });
+const echoProto = grpc.loadPackageDefinition(packageDefinition).grpc.examples.echo;
+
+function unaryCall(client, requestId, message, expectedCode) {
+  return new Promise((resolve, reject) => {
+    const deadline = new Date();
+    deadline.setSeconds(deadline.getSeconds() + 1);
+    client.unaryEcho({message: message}, {deadline}, (error, value) => {
+      let code;
+      if (error) {
+        code = error.code;
+      } else {
+        code = grpc.status.OK;
+      }
+      console.log(`[${requestId}] wanted = ${grpc.status[expectedCode]} got = ${grpc.status[code]}`);
+      resolve();
+    });
+  });
+}
+
+function streamingCall(client, requestId, message, expectedCode) {
+  return new Promise((resolve, reject) => {
+    const deadline = new Date();
+    deadline.setSeconds(deadline.getSeconds() + 1);
+    const call = client.bidirectionalStreamingEcho({deadline});
+    call.on('data', () => {
+      // Consume all response messages
+    });
+    call.on('status', status => {
+      console.log(`[${requestId}] wanted = ${grpc.status[expectedCode]} got = ${grpc.status[status.code]}`);
+      resolve();
+    });
+    call.on('error', () => {
+      // Ignore error event
+    });
+    call.write({message});
+    call.end();
+  });
+}
+
+async function main() {
+  let argv = parseArgs(process.argv.slice(2), {
+    string: 'target',
+    default: {target: 'localhost:50052'}
+  });
+  const client = new echoProto.Echo(argv.target, grpc.credentials.createInsecure());
+  // A successful request
+  await unaryCall(client, 1, 'world', grpc.status.OK);
+  // Exceeds deadline
+  await unaryCall(client, 2, 'delay', grpc.status.DEADLINE_EXCEEDED);
+  // A successful request with propagated deadline
+  await unaryCall(client, 3, '[propagate me]world', grpc.status.OK);
+  // Exceeds propagated deadline
+  await unaryCall(client, 4, '[propagate me][propagate me]world', grpc.status.DEADLINE_EXCEEDED);
+  // Receives a response from the stream successfully
+  await streamingCall(client, 5, '[propagate me]world', grpc.status.OK);
+  // Exceeds propagated deadline before receiving a response
+  await streamingCall(client, 6, '[propagate me][propagate me]world', grpc.status.DEADLINE_EXCEEDED);
+}
+
+main();

examples/deadline/server.js

@@ -0,0 +1,109 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+const grpc = require('@grpc/grpc-js');
+const protoLoader = require('@grpc/proto-loader');
+const parseArgs = require('minimist');
+
+const PROTO_PATH = __dirname + '/../protos/echo.proto';
+
+const packageDefinition = protoLoader.loadSync(
+  PROTO_PATH,
+  {keepCase: true,
+   longs: String,
+   enums: String,
+   defaults: true,
+   oneofs: true
+  });
+const echoProto = grpc.loadPackageDefinition(packageDefinition).grpc.examples.echo;
+
+const PROPAGATE_PREFIX = '[propagate me]';
+
+let client;
+
+function unaryEcho(call, callback) {
+  const message = call.request.message;
+  if (message.startsWith(PROPAGATE_PREFIX)) {
+    setTimeout(() => {
+      client.unaryEcho({message: message.slice(PROPAGATE_PREFIX.length)}, {parent: call}, callback);
+    }, 800);
+    return;
+  } else if (message === 'delay') {
+    setTimeout(() => {
+      callback(null, call.request);
+    }, 1500);
+  } else {
+    callback(null, call.request);
+  }
+}
+
+function bidirectionalStreamingEcho(call) {
+  let lastMessage = null;
+  call.on('data', value => {
+    const message = value.message;
+    lastMessage = message;
+    call.pause();
+    if (message.startsWith(PROPAGATE_PREFIX)) {
+      setTimeout(() => {
+        client.unaryEcho({message: message.slice(PROPAGATE_PREFIX.length)}, {parent: call}, (error, response) => {
+          call.resume();
+          if (error) {
+            call.emit(error);
+            return;
+          }
+          call.write(response);
+        });
+      }, 800);
+      return;
+    } else if (message === 'delay') {
+      setTimeout(() => {
+        call.write(value);
+        call.resume();
+      }, 1500);
+    } else {
+      call.write(value);
+      call.resume();
+    }
+  });
+  call.on('end', () => {
+    if (lastMessage === null) {
+      call.emit('error', {code: grpc.status.INVALID_ARGUMENT, details: 'request message not received'});
+    }
+    call.end();
+  });
+}
+
+const serviceImplementation = {
+  unaryEcho,
+  bidirectionalStreamingEcho
+}
+
+function main() {
+  const argv = parseArgs(process.argv.slice(2), {
+    string: 'port',
+    default: {port: '50052'}
+  });
+  const server = new grpc.Server();
+  server.addService(echoProto.Echo.service, serviceImplementation);
+  server.bindAsync(`0.0.0.0:${argv.port}`, grpc.ServerCredentials.createInsecure(), () => {
+    server.start();
+  });
+  client = new echoProto.Echo(`localhost:${argv.port}`, grpc.credentials.createInsecure());
+}
+
+main();