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@@ -213,12 +213,12 @@ export class GrpcService {
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this.checkConnectionHealth(client, statusControl, alreadyHealthCheck)
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- call.on('status', (status: Status) => {
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+ call.on('status', (status: Status) => { // this is useless in streaming(on for unary)
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// console.log(status) // For more info: https://grpc.github.io/grpc/core/md_doc_statuscodes.html
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// https://grpc.io/docs/what-is-grpc/core-concepts/#streaming
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- if (status == grpc.status.UNAVAILABLE) { // only returns a status when there's error. Otherwise it just waits
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- resolve('No connection established. Server is not responding..')
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- }
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+ // if (status == grpc.status.UNAVAILABLE) { // only returns a status when there's error. Otherwise it just waits
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+ // resolve('No connection established. Server is not responding..')
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+ // }
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});
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// All the grpc operations are here
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@@ -238,11 +238,11 @@ export class GrpcService {
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call.on('data', (data: any) => {
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let message = JSON.parse(data.message)
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- console.log(`Received acknowledgement from Server: ${message.msgId ?? message.appData?.msgId ?? `Invalid`}`);
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+ console.log(`Received message from Server: ${message.msgId ?? message.appData?.msgId ?? `Invalid`}`);
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});
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call.on('error', (err) => {
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- console.log(`Something wrong with RPC call...`)
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+ // console.log(`Something wrong with RPC call...`)
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if (!unsubscribed && subscription) { // kill subcription to prevent memory leaks
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subscription.unsubscribe();
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unsubscribed = true;
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@@ -266,20 +266,22 @@ export class GrpcService {
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try {
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// https://github.com/grpc/proposal/blob/master/L5-node-client-interceptors.md
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let server: grpc.Server = new grpc.Server();
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- let onHold: any
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// Add the streamingData function to the gRPC service
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// Define your message_proto.Message service methods
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server.addService(message_proto.Message.service, {
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HandleMessage: (call) => { // this is for bidirectional streaming. Need to have another one for unary calls for web clients
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+ let requestId = call.request // unary request from client to be responded with a stream
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+ console.log(`Processing unary call.... requestId: ${requestId.id}`)
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console.log(`Client connected from: ${call.getPeer()}`);
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- // let request = call.request // just putting it here to verify unary call request
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- let report: ReportStatus = {
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+
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+ let report: ReportStatus = { //let the flow come through
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code: ColorCode.GREEN,
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message: `Client connected!!`
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}
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statusControl.next(report)
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- let subscription: Subscription = messageToBeStream.subscribe({
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+
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+ let subscription: Subscription = messageToBeStream.pipe(take(15)).subscribe({
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next: (payload: any) => {
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let noConnection = call.cancelled // check connection for each and every message
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if (noConnection === true) { // that means there's no connection, beccause the cancel operation is determined to check
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@@ -291,10 +293,10 @@ export class GrpcService {
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statusControl.next(report)
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subscription.unsubscribe()
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} else {
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- console.log(`Sending ${payload.appData.msgId}`)
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+ console.log(`Sending ${payload.appData.msgId} in respond to unary ${requestId.id}`)
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let message: string = JSON.stringify(payload)
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call.write({ message })
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- // onHold = null
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+
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}
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},
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error: err => {
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@@ -304,41 +306,14 @@ export class GrpcService {
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message: `Message streaming error`
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}
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statusControl.next(report)
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+ subscription.unsubscribe()
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},
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- complete: () => console.log(``) //it will never complete
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- })
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-
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- call.on('data', (data: any) => {
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- // console.log(data) // it does return in string format
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- let payload = JSON.parse(data.message)
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- console.log(data)
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- // console.log(`Received Message from Client: ${payload.appData?.msgId}`);
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- // Forward the received message to the RxJS subject
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- let respmsg: any = {
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- msgId: payload.appData?.msgId,
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- confirmationMessage: `Message ${payload.appData?.msgId} acknowledged!`
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+ complete: () => {
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+ console.log(`Stream response completed for ${requestId.id}`)
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+ subscription.unsubscribe()
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+ // call.end()
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}
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- let message: string = JSON.stringify(respmsg)
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- console.log(`Responding to client: ${respmsg.msgId}`);
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- // Note: The parameter here MUST BE STRICTLY be the same letter as defined in proto. Eg: message MessageRequest { string >>'message'<< = 1 }
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- call.write({ message });
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- });
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-
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- call.on('end', () => {
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- console.log('Client stream ended');
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- // but the stream never ends. THis is not a reliable way to tell if a client is disconnected
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- });
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-
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- call.on('error', (err) => {
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- // Error that may occue during the rpc call. Id there's an error, put a callbacn function there to check the connection for client
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- // emit a yellow report to halt message release. If the server does not reply to the callback function, then emit a red card
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- // the call back function will be to write and then the client should response immediately through test
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- });
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-
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- call.on('close', () => {
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- console.log('Unknown cause for diconnectivity');
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- // Handle client closure, which may be due to errors or manual termination
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- });
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+ })
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},
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Check: (_, callback) => {
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@@ -371,11 +346,11 @@ export class GrpcService {
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unaryRequestSubject.subscribe({
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next: (request: any) => {
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let message = {
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- id: '123',
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+ id: request.appData?.msgId,
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message: JSON.stringify(request)
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}
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- console.log(`Sending request: ${message.id} over to server....`)
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+ console.log(`<${message.id}> Sending request: ${message.id} over to server....`)
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const call = client.HandleMessage(message)
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call.on('status', (status: Status) => {
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@@ -395,8 +370,7 @@ export class GrpcService {
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});
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call.on('data', (data: any) => {
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- let message = JSON.parse(data.message)
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- console.log(`Received data from Server: ${message.appData?.msgId ?? `Invalid`}`);
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+ console.log(`Received stream response from Server. Receiver: ${message.id}`);
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});
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call.on('error', (err) => {
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@@ -409,6 +383,7 @@ export class GrpcService {
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});
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call.on('end', () => { // this is for gracefull || willfull termination from the server
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+ console.log(`Streaming Response is completed`)
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let report = {
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code: ColorCode.YELLOW,
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message: `Server doesn't seem to be alive. Error returned.`
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