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# Cancellation | ||
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This example shows how clients can cancel in-flight RPCs by cancelling the | ||
call object returned by the method invocation. The client will receive a status | ||
with code `CANCELLED` and the server handler's call object will emit a | ||
`'cancelled'` event. | ||
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## Start the server | ||
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``` | ||
node server.js | ||
``` | ||
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## Run the client | ||
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``` | ||
node client.js | ||
``` |
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/* | ||
* | ||
* 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. | ||
* | ||
*/ | ||
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const grpc = require('@grpc/grpc-js'); | ||
const protoLoader = require('@grpc/proto-loader'); | ||
const parseArgs = require('minimist'); | ||
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const PROTO_PATH = __dirname + '/../protos/echo.proto'; | ||
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const packageDefinition = protoLoader.loadSync( | ||
PROTO_PATH, | ||
{keepCase: true, | ||
longs: String, | ||
enums: String, | ||
defaults: true, | ||
oneofs: true | ||
}); | ||
const echoProto = grpc.loadPackageDefinition(packageDefinition).grpc.examples.echo; | ||
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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()); | ||
const call = client.bidirectionalStreamingEcho(); | ||
const EXPECTED_MESSAGES = 2; | ||
let receivedMessages = 0; | ||
call.on('data', value => { | ||
console.log(`received message "${value.message}"`) | ||
receivedMessages += 1; | ||
if (receivedMessages >= EXPECTED_MESSAGES) { | ||
console.log('cancelling call'); | ||
call.cancel(); | ||
} | ||
}); | ||
call.on('status', statusObject => { | ||
console.log(`received call status with code ${grpc.status[statusObject.code]}`); | ||
}); | ||
call.on('error', error => { | ||
console.log(`received error ${error}`); | ||
}) | ||
console.log('sending message "hello"'); | ||
call.write({message: 'hello'}); | ||
console.log('sending message "world"') | ||
call.write({message: 'world'}); | ||
} | ||
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main(); |
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/* | ||
* | ||
* Copyright 2023 gRPC authors. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
* | ||
*/ | ||
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const grpc = require('@grpc/grpc-js'); | ||
const protoLoader = require('@grpc/proto-loader'); | ||
const parseArgs = require('minimist'); | ||
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const PROTO_PATH = __dirname + '/../protos/echo.proto'; | ||
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const packageDefinition = protoLoader.loadSync( | ||
PROTO_PATH, | ||
{keepCase: true, | ||
longs: String, | ||
enums: String, | ||
defaults: true, | ||
oneofs: true | ||
}); | ||
const echoProto = grpc.loadPackageDefinition(packageDefinition).grpc.examples.echo; | ||
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function bidirectionalStreamingEcho(call) { | ||
call.on('data', value => { | ||
const message = value.message; | ||
console.log(`echoing message "${message}"`); | ||
call.write({message: message}); | ||
}); | ||
call.on('end', () => { | ||
call.end(); | ||
}); | ||
call.on('cancelled', () => { | ||
console.log('received cancelled event'); | ||
}); | ||
} | ||
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const serviceImplementation = { | ||
bidirectionalStreamingEcho | ||
} | ||
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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()); | ||
} | ||
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main(); |