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client.ts
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client.ts
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import path from 'path'
import * as grpc from '@grpc/grpc-js'
import * as protoLoader from '@grpc/proto-loader'
import { ProtoGrpcType } from "./protos/example"
const PORT = 8082
const PROTO_FILE = './protos/example.proto'
const packageDef = protoLoader.loadSync(path.resolve(__dirname, PROTO_FILE))
const grpcObj = (grpc.loadPackageDefinition(packageDef) as unknown) as ProtoGrpcType
const client = new grpcObj.examplePackage.Example(
`0.0.0.0:${PORT}`, grpc.credentials.createInsecure()
)
const deadline = new Date()
deadline.setSeconds(deadline.getSeconds() + 5)
client.waitForReady(deadline, (err) => {
if (err) {
console.error(err)
return
}
onClientReady()
})
function onClientReady() {
// Unary Call. Client sends "Ping" and Server responses with "Pong"
// Check the file server.ts for more details on how server returns the response to this method.
client.PingPong({message: "Ping"}, (err, result) => {
if (err) {
console.error(err)
return
}
console.log(result)
})
// Server Streaming Call. Client sends a number "maxVal = 50" and Server keeps streaming responses with some values a certain number of times.
// Check the file server.ts for more details on how server responds to this method with the stream of numbers.
const stream = client.RandomNumbers({maxVal: 50})
stream.on("data", (chunk) => {
console.log(chunk)
})
stream.on("end", () => {
console.log("Server Streaming Communication End");
})
// Client Streaming Call. Client keeps on adding todolists for a certain number of times which is shown below while server waits for all these request to finish.
// Once the client has finished sending all the values, server will process those and returns the response to client with all todoList.
// Check the file server.ts for more details on how server sends the response to the client with all todoList.
const clientStream = client.todoList((err, result) => {
if (err) {
console.error(err)
return
}
console.log(result)
})
clientStream.write({todo: "Do an awesome job today", status: "In Progress"})
clientStream.write({todo: "Learn to code gRPC in typescript", status: "Todo"})
clientStream.write({todo: "Follow my github page", status: "Done"})
clientStream.write({todo: "Check out my other repositories", status: "Ready to pick"})
clientStream.end()
}