namespacepubsub=::google::cloud::pubsub;using::google::cloud::future;using::google::cloud::StatusOr;return[](pubsub::Subscribersubscriber){autosession=subscriber.Subscribe([](pubsub::Messageconst&m,pubsub::AckHandlerh){std::cout <<"Message contents: " <<m.data() <<"\n";std::move(h).ack();});returnsession;}

namespacepubsub=::google::cloud::pubsub;using::google::cloud::future;using::google::cloud::StatusOr;return[](pubsub::Subscribersubscriber){autosession=subscriber.Subscribe([](pubsub::Messageconst&m,pubsub::AckHandlerh){google::cloud::pubsub::samples::Statestate;state.ParseFromString(std::string{m.data()});std::cout <<"Message contents: " <<state.DebugString() <<"\n";std::move(h).ack();});returnsession;}

usingAvro.IO;usingAvro.Specific;usingGoogle.Api.Gax;usingGoogle.Cloud.PubSub.V1;usingNewtonsoft.Json;usingSystem;usingSystem.IO;usingSystem.Threading;usingSystem.Threading.Tasks;publicclassPullAvroMessagesAsyncSample{publicasyncTask<int>PullAvroMessagesAsync(stringprojectId,stringsubscriptionId,boolacknowledge){SubscriptionNamesubscriptionName=SubscriptionName.FromProjectSubscription(projectId,subscriptionId);intmessageCount=0;SubscriberClientsubscriber=awaitnewSubscriberClientBuilder{SubscriptionName=subscriptionName,Settings=newSubscriberClient.Settings{AckExtensionWindow=TimeSpan.FromSeconds(4),AckDeadline=TimeSpan.FromSeconds(10),FlowControlSettings=newFlowControlSettings(maxOutstandingElementCount:100,maxOutstandingByteCount:10240)}}.BuildAsync();// SubscriberClient runs your message handle function on multiple// threads to maximize throughput.TaskstartTask=subscriber.StartAsync((PubsubMessagemessage,CancellationTokencancel)=>{stringencoding=message.Attributes["googclient_schemaencoding"];// AvroUtilities is a namespace. Below are files using the namespace.// https://github.com/GoogleCloudPlatform/dotnet-docs-samples/blob/main/pubsub/api/Pubsub.Samples/Utilities/State.cs// https://github.com/GoogleCloudPlatform/dotnet-docs-samples/blob/main/pubsub/api/Pubsub.Samples/Utilities/StateUtils.csAvroUtilities.Statestate=newAvroUtilities.State();switch(encoding){case"BINARY":using(varms=newMemoryStream(message.Data.ToByteArray())){vardecoder=newBinaryDecoder(ms);varreader=newSpecificDefaultReader(state.Schema,state.Schema);reader.Read<AvroUtilities.State>(state,decoder);}break;case"JSON":state=JsonConvert.DeserializeObject<AvroUtilities.State>(message.Data.ToStringUtf8());break;default:Console.WriteLine($"Encoding not provided in message.");break;}Console.WriteLine($"Message {message.MessageId}: {state}");Interlocked.Increment(refmessageCount);returnTask.FromResult(acknowledge?SubscriberClient.Reply.Ack:SubscriberClient.Reply.Nack);});// Run for 5 seconds.awaitTask.Delay(5000);awaitsubscriber.StopAsync(CancellationToken.None);// Lets make sure that the start task finished successfully after the call to stop.awaitstartTask;returnmessageCount;}}

usingGoogle.Api.Gax;usingGoogle.Cloud.PubSub.V1;usingSystem;usingSystem.Threading;usingSystem.Threading.Tasks;publicclassPullProtoMessagesAsyncSample{publicasyncTask<int>PullProtoMessagesAsync(stringprojectId,stringsubscriptionId,boolacknowledge){SubscriptionNamesubscriptionName=SubscriptionName.FromProjectSubscription(projectId,subscriptionId);intmessageCount=0;SubscriberClientsubscriber=awaitnewSubscriberClientBuilder{SubscriptionName=subscriptionName,Settings=newSubscriberClient.Settings{AckExtensionWindow=TimeSpan.FromSeconds(4),AckDeadline=TimeSpan.FromSeconds(10),FlowControlSettings=newFlowControlSettings(maxOutstandingElementCount:100,maxOutstandingByteCount:10240)}}.BuildAsync();// SubscriberClient runs your message handle function on multiple// threads to maximize throughput.TaskstartTask=subscriber.StartAsync((PubsubMessagemessage,CancellationTokencancel)=>{stringencoding=message.Attributes["googclient_schemaencoding"];Utilities.Statestate=null;switch(encoding){case"BINARY":state=Utilities.State.Parser.ParseFrom(message.Data.ToByteArray());break;case"JSON":state=Utilities.State.Parser.ParseJson(message.Data.ToStringUtf8());break;default:Console.WriteLine($"Encoding not provided in message.");break;}Console.WriteLine($"Message {message.MessageId}: {state}");Interlocked.Increment(refmessageCount);returnTask.FromResult(acknowledge?SubscriberClient.Reply.Ack:SubscriberClient.Reply.Nack);});// Run for 5 seconds.awaitTask.Delay(5000);awaitsubscriber.StopAsync(CancellationToken.None);// Lets make sure that the start task finished successfully after the call to stop.awaitstartTask;returnmessageCount;}}

import("context""fmt""io""os""sync""time""cloud.google.com/go/pubsub/v2""github.com/linkedin/goavro/v2")funcsubscribeWithAvroSchema(wio.Writer,projectID,subID,avscFilestring)error{// projectID := "my-project-id"// topicID := "my-topic"// avscFile = "path/to/an/avro/schema/file(.avsc)/formatted/in/json"ctx:=context.Background()client,err:=pubsub.NewClient(ctx,projectID)iferr!=nil{returnfmt.Errorf("pubsub.NewClient: %w",err)}avroSchema,err:=os.ReadFile(avscFile)iferr!=nil{returnfmt.Errorf("os.ReadFile err: %w",err)}codec,err:=goavro.NewCodec(string(avroSchema))iferr!=nil{returnfmt.Errorf("goavro.NewCodec err: %w",err)}sub:=client.Subscriber(subID)ctx2,cancel:=context.WithTimeout(ctx,10*time.Second)defercancel()varmusync.Mutexsub.Receive(ctx2,func(ctxcontext.Context,msg*pubsub.Message){mu.Lock()defermu.Unlock()encoding:=msg.Attributes["googclient_schemaencoding"]varstatemap[string]interface{}ifencoding=="BINARY"{data,_,err:=codec.NativeFromBinary(msg.Data)iferr!=nil{fmt.Fprintf(w,"codec.NativeFromBinary err: %v\n",err)msg.Nack()return}fmt.Fprintf(w,"Received a binary-encoded message:\n%#v\n",data)state=data.(map[string]interface{})}elseifencoding=="JSON"{data,_,err:=codec.NativeFromTextual(msg.Data)iferr!=nil{fmt.Fprintf(w,"codec.NativeFromTextual err: %v\n",err)msg.Nack()return}fmt.Fprintf(w,"Received a JSON-encoded message:\n%#v\n",data)state=data.(map[string]interface{})}else{fmt.Fprintf(w,"Unknown message type(%s), nacking\n",encoding)msg.Nack()return}fmt.Fprintf(w,"%s is abbreviated as %s\n",state["name"],state["post_abbr"])msg.Ack()})returnnil}

import("context""fmt""io""sync""time""cloud.google.com/go/pubsub/v2"statepb"github.com/GoogleCloudPlatform/golang-samples/internal/pubsub/schemas""google.golang.org/protobuf/encoding/protojson""google.golang.org/protobuf/proto")funcsubscribeWithProtoSchema(wio.Writer,projectID,subIDstring)error{// projectID := "my-project-id"// subID := "my-sub"ctx:=context.Background()client,err:=pubsub.NewClient(ctx,projectID)iferr!=nil{returnfmt.Errorf("pubsub.NewClient: %w",err)}// Create an instance of the message to be decoded (a single U.S. state).state:=&statepb.State{}sub:=client.Subscriber(subID)ctx2,cancel:=context.WithTimeout(ctx,10*time.Second)defercancel()varmusync.Mutexsub.Receive(ctx2,func(ctxcontext.Context,msg*pubsub.Message){mu.Lock()defermu.Unlock()encoding:=msg.Attributes["googclient_schemaencoding"]ifencoding=="BINARY"{iferr:=proto.Unmarshal(msg.Data,state);err!=nil{fmt.Fprintf(w,"proto.Unmarshal err: %v\n",err)msg.Nack()return}fmt.Printf("Received a binary-encoded message:\n%#v\n",state)}elseifencoding=="JSON"{iferr:=protojson.Unmarshal(msg.Data,state);err!=nil{fmt.Fprintf(w,"proto.Unmarshal err: %v\n",err)msg.Nack()return}fmt.Fprintf(w,"Received a JSON-encoded message:\n%#v\n",state)}else{fmt.Fprintf(w,"Unknown message type(%s), nacking\n",encoding)msg.Nack()return}fmt.Fprintf(w,"%s is abbreviated as %s\n",state.Name,state.PostAbbr)msg.Ack()})returnnil}

importcom.google.cloud.pubsub.v1.AckReplyConsumer;importcom.google.cloud.pubsub.v1.MessageReceiver;importcom.google.cloud.pubsub.v1.Subscriber;importcom.google.protobuf.ByteString;importcom.google.pubsub.v1.ProjectSubscriptionName;importcom.google.pubsub.v1.PubsubMessage;importjava.io.ByteArrayInputStream;importjava.io.IOException;importjava.io.InputStream;importjava.util.concurrent.TimeUnit;importjava.util.concurrent.TimeoutException;importorg.apache.avro.io.Decoder;importorg.apache.avro.io.DecoderFactory;importorg.apache.avro.specific.SpecificDatumReader;importutilities.State;publicclassSubscribeWithAvroSchemaExample{publicstaticvoidmain(String...args)throwsException{// TODO(developer): Replace these variables before running the sample.StringprojectId="your-project-id";// Use an existing subscription.StringsubscriptionId="your-subscription-id";subscribeWithAvroSchemaExample(projectId,subscriptionId);}publicstaticvoidsubscribeWithAvroSchemaExample(StringprojectId,StringsubscriptionId){ProjectSubscriptionNamesubscriptionName=ProjectSubscriptionName.of(projectId,subscriptionId);// Prepare a reader for the encoded Avro records.SpecificDatumReader<State>reader=newSpecificDatumReader<>(State.getClassSchema());// Instantiate an asynchronous message receiver.MessageReceiverreceiver=(PubsubMessagemessage,AckReplyConsumerconsumer)->{ByteStringdata=message.getData();// Get the schema encoding type.Stringencoding=message.getAttributesMap().get("googclient_schemaencoding");// Send the message data to a byte[] input stream.InputStreaminputStream=newByteArrayInputStream(data.toByteArray());Decoderdecoder=null;// Prepare an appropriate decoder for the message data in the input stream// based on the schema encoding type.block:try{switch(encoding){case"BINARY":decoder=DecoderFactory.get().directBinaryDecoder(inputStream,/* reuse= */null);System.out.println("Receiving a binary-encoded message:");break;case"JSON":decoder=DecoderFactory.get().jsonDecoder(State.getClassSchema(),inputStream);System.out.println("Receiving a JSON-encoded message:");break;default:breakblock;}// Obtain an object of the generated Avro class using the decoder.Statestate=reader.read(null,decoder);System.out.println(state.getName()+" is abbreviated as "+state.getPostAbbr());}catch(IOExceptione){System.err.println(e);}// Ack the message.consumer.ack();};Subscribersubscriber=null;try{subscriber=Subscriber.newBuilder(subscriptionName,receiver).build();subscriber.startAsync().awaitRunning();System.out.printf("Listening for messages on %s:\n",subscriptionName.toString());subscriber.awaitTerminated(30,TimeUnit.SECONDS);}catch(TimeoutExceptiontimeoutException){subscriber.stopAsync();}}}

importcom.google.cloud.pubsub.v1.AckReplyConsumer;importcom.google.cloud.pubsub.v1.MessageReceiver;importcom.google.cloud.pubsub.v1.Subscriber;importcom.google.protobuf.ByteString;importcom.google.protobuf.InvalidProtocolBufferException;importcom.google.protobuf.util.JsonFormat;importcom.google.pubsub.v1.ProjectSubscriptionName;importcom.google.pubsub.v1.PubsubMessage;importjava.util.concurrent.TimeUnit;importjava.util.concurrent.TimeoutException;importutilities.StateProto.State;publicclassSubscribeWithProtoSchemaExample{publicstaticvoidmain(String...args)throwsException{// TODO(developer): Replace these variables before running the sample.StringprojectId="your-project-id";// Use an existing subscription.StringsubscriptionId="your-subscription-id";subscribeWithProtoSchemaExample(projectId,subscriptionId);}publicstaticvoidsubscribeWithProtoSchemaExample(StringprojectId,StringsubscriptionId){ProjectSubscriptionNamesubscriptionName=ProjectSubscriptionName.of(projectId,subscriptionId);MessageReceiverreceiver=(PubsubMessagemessage,AckReplyConsumerconsumer)->{ByteStringdata=message.getData();// Get the schema encoding type.Stringencoding=message.getAttributesMap().get("googclient_schemaencoding");block:try{switch(encoding){case"BINARY":// Obtain an object of the generated proto class.Statestate=State.parseFrom(data);System.out.println("Received a BINARY-formatted message: "+state);break;case"JSON":State.BuilderstateBuilder=State.newBuilder();JsonFormat.parser().merge(data.toStringUtf8(),stateBuilder);System.out.println("Received a JSON-formatted message:"+stateBuilder.build());break;default:breakblock;}}catch(InvalidProtocolBufferExceptione){e.printStackTrace();}consumer.ack();System.out.println("Ack'ed the message");};// Create subscriber client.Subscribersubscriber=Subscriber.newBuilder(subscriptionName,receiver).build();try{subscriber.startAsync().awaitRunning();System.out.printf("Listening for messages on %s:\n",subscriptionName);subscriber.awaitTerminated(30,TimeUnit.SECONDS);}catch(TimeoutExceptiontimeoutException){subscriber.stopAsync();}}}

/** * TODO(developer): Uncomment these variables before running the sample. */// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';// const timeout = 60;// Imports the Google Cloud client libraryconst{PubSub,Schema,Encodings}=require('@google-cloud/pubsub');// Node FS library, to load definitionsconstfs=require('fs');// And the Apache Avro libraryconstavro=require('avro-js');// Creates a client; cache this for further useconstpubSubClient=newPubSub();functionlistenForAvroRecords(subscriptionNameOrId,timeout){// References an existing subscriptionconstsubscription=pubSubClient.subscription(subscriptionNameOrId);// Make an encoder using the official avro-js library.constdefinition=fs.readFileSync('system-test/fixtures/provinces.avsc').toString();consttype=avro.parse(definition);// Create an event handler to handle messagesletmessageCount=0;constmessageHandler=asyncmessage=>{// "Ack" (acknowledge receipt of) the messagemessage.ack();// Get the schema metadata from the message.constschemaMetadata=Schema.metadataFromMessage(message.attributes);letresult;switch(schemaMetadata.encoding){caseEncodings.Binary:result=type.fromBuffer(message.data);break;caseEncodings.Json:result=type.fromString(message.data.toString());break;default:console.log(`Unknown schema encoding:${schemaMetadata.encoding}`);break;}console.log(`Received message${message.id}:`);console.log(`\tData:${JSON.stringify(result,null,4)}`);console.log(`\tAttributes:${message.attributes}`);messageCount+=1;};// Listen for new messages until timeout is hitsubscription.on('message',messageHandler);setTimeout(()=>{subscription.removeListener('message',messageHandler);console.log(`${messageCount} message(s) received.`);},timeout*1000);}

/** * TODO(developer): Uncomment these variables before running the sample. */// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';// const timeout = 60;// Imports the Google Cloud client libraryconst{PubSub,Schema,Encodings}=require('@google-cloud/pubsub');// And the protobufjs libraryconstprotobuf=require('protobufjs');// Creates a client; cache this for further useconstpubSubClient=newPubSub();asyncfunctionlistenForProtobufMessages(subscriptionNameOrId,timeout){// References an existing subscriptionconstsubscription=pubSubClient.subscription(subscriptionNameOrId);// Make an decoder using the protobufjs library.//// Since we're providing the test message for a specific schema here, we'll// also code in the path to a sample proto definition.constroot=protobuf.loadSync('system-test/fixtures/provinces.proto');constProvince=root.lookupType('utilities.Province');// Create an event handler to handle messagesletmessageCount=0;constmessageHandler=asyncmessage=>{// "Ack" (acknowledge receipt of) the messagemessage.ack();// Get the schema metadata from the message.constschemaMetadata=Schema.metadataFromMessage(message.attributes);letresult;switch(schemaMetadata.encoding){caseEncodings.Binary:result=Province.decode(message.data);break;caseEncodings.Json:// This doesn't require decoding with the protobuf library,// since it's plain JSON. But you can still validate it against// your schema.result=JSON.parse(message.data.toString());console.log(`Validation of JSON:${Province.verify(result)}`);break;default:console.log(`Unknown schema encoding:${schemaMetadata.encoding}`);break;}console.log(`Received message${message.id}:`);console.log(`\tData:${JSON.stringify(result,null,4)}`);console.log(`\tAttributes:${JSON.stringify(message.attributes,null,4)}`);messageCount+=1;};// Listen for new messages until timeout is hitsubscription.on('message',messageHandler);setTimeout(()=>{subscription.removeListener('message',messageHandler);console.log(`${messageCount} message(s) received.`);},timeout*1000);}

/** * TODO(developer): Uncomment these variables before running the sample. */// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';// const timeout = 60;// Imports the Google Cloud client libraryimport{PubSub,Schema,Encodings,Message}from'@google-cloud/pubsub';// Node FS library, to load definitionsimport*asfsfrom'fs';// And the Apache Avro libraryimport*asavrofrom'avro-js';// Creates a client; cache this for further useconstpubSubClient=newPubSub();functionlistenForAvroRecords(subscriptionNameOrId:string,timeout:number){// References an existing subscriptionconstsubscription=pubSubClient.subscription(subscriptionNameOrId);// Make an encoder using the official avro-js library.constdefinition=fs.readFileSync('system-test/fixtures/provinces.avsc').toString();consttype=avro.parse(definition);// Create an event handler to handle messagesletmessageCount=0;constmessageHandler=async(message:Message)=>{// "Ack" (acknowledge receipt of) the messagemessage.ack();// Get the schema metadata from the message.constschemaMetadata=Schema.metadataFromMessage(message.attributes);letresult:object|undefined;switch(schemaMetadata.encoding){caseEncodings.Binary:result=type.fromBuffer(message.data);break;caseEncodings.Json:result=type.fromString(message.data.toString());break;default:console.log(`Unknown schema encoding:${schemaMetadata.encoding}`);break;}console.log(`Received message${message.id}:`);console.log(`\tData:${JSON.stringify(result,null,4)}`);console.log(`\tAttributes:${message.attributes}`);messageCount+=1;};// Listen for new messages until timeout is hitsubscription.on('message',messageHandler);setTimeout(()=>{subscription.removeListener('message',messageHandler);console.log(`${messageCount} message(s) received.`);},timeout*1000);}

/** * TODO(developer): Uncomment these variables before running the sample. */// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';// const timeout = 60;// Imports the Google Cloud client libraryimport{PubSub,Schema,Encodings,Message}from'@google-cloud/pubsub';// And the protobufjs libraryimport*asprotobuffrom'protobufjs';// Creates a client; cache this for further useconstpubSubClient=newPubSub();asyncfunctionlistenForProtobufMessages(subscriptionNameOrId:string,timeout:number,){// References an existing subscriptionconstsubscription=pubSubClient.subscription(subscriptionNameOrId);// Make an decoder using the protobufjs library.//// Since we're providing the test message for a specific schema here, we'll// also code in the path to a sample proto definition.constroot=protobuf.loadSync('system-test/fixtures/provinces.proto');constProvince=root.lookupType('utilities.Province');// Create an event handler to handle messagesletmessageCount=0;constmessageHandler=async(message:Message)=>{// "Ack" (acknowledge receipt of) the messagemessage.ack();// Get the schema metadata from the message.constschemaMetadata=Schema.metadataFromMessage(message.attributes);letresult;switch(schemaMetadata.encoding){caseEncodings.Binary:result=Province.decode(message.data);break;caseEncodings.Json:// This doesn't require decoding with the protobuf library,// since it's plain JSON. But you can still validate it against// your schema.result=JSON.parse(message.data.toString());console.log(`Validation of JSON:${Province.verify(result)}`);break;default:console.log(`Unknown schema encoding:${schemaMetadata.encoding}`);break;}console.log(`Received message${message.id}:`);console.log(`\tData:${JSON.stringify(result,null,4)}`);console.log(`\tAttributes:${JSON.stringify(message.attributes,null,4)}`);messageCount+=1;};// Listen for new messages until timeout is hitsubscription.on('message',messageHandler);setTimeout(()=>{subscription.removeListener('message',messageHandler);console.log(`${messageCount} message(s) received.`);},timeout*1000);}

use Google\Cloud\PubSub\PubSubClient;/** * Subscribe and pull messages using an AVRO schema. * * @param string $projectId * @param string $subscriptionId */function subscribe_avro_records($projectId, $subscriptionId, $definitionFile){    $pubsub = new PubSubClient([        'projectId' => $projectId,    ]);    $subscription = $pubsub->subscription($subscriptionId);    $definition = file_get_contents($definitionFile);    $messages = $subscription->pull();    foreach ($messages as $message) {        $decodedMessageData = '';        $encoding = $message->attribute('googclient_schemaencoding');        switch ($encoding) {            case 'BINARY':                $io = new \AvroStringIO($message->data());                $schema = \AvroSchema::parse($definition);                $reader = new \AvroIODatumReader($schema);                $decoder = new \AvroIOBinaryDecoder($io);                $decodedMessageData = json_encode($reader->read($decoder));                break;            case 'JSON':                $decodedMessageData = $message->data();                break;        }        printf('Received a %d-encoded message %s', $encoding, $decodedMessageData);    }}

use Google\Cloud\PubSub\PubSubClient;/** * Subscribe and pull messages using a protocol buffer schema. * * Relies on a proto message of the following form: * ``` * syntax = "proto3"; * * package utilities; * * message StateProto { *   string name = 1; *   string post_abbr = 2; * } * ``` * * @param string $projectId * @param string $subscriptionId */function subscribe_proto_messages($projectId, $subscriptionId){    $pubsub = new PubSubClient([        'projectId' => $projectId,    ]);    $subscription = $pubsub->subscription($subscriptionId);    $messages = $subscription->pull();    foreach ($messages as $message) {        $decodedMessageData = '';        $encoding = $message->attribute('googclient_schemaencoding');        switch ($encoding) {            case 'BINARY':                $protobufMessage = new \Utilities\StateProto();                $protobufMessage->mergeFromString($message->data());                $decodedMessageData = $protobufMessage->serializeToJsonString();                break;            case 'JSON':                $decodedMessageData = $message->data();                break;        }        printf('Received a %d-encoded message %s', $encoding, $decodedMessageData);    }}

importavro.schemaasschemafromavro.ioimportBinaryDecoder,DatumReaderfromconcurrent.futuresimportTimeoutErrorimportioimportjsonfromgoogle.cloud.pubsubimportSubscriberClient# TODO(developer)# project_id = "your-project-id"# subscription_id = "your-subscription-id"# avsc_file = "path/to/an/avro/schema/file/(.avsc)/formatted/in/json"# Number of seconds the subscriber listens for messages# timeout = 5.0subscriber=SubscriberClient()subscription_path=subscriber.subscription_path(project_id,subscription_id)withopen(avsc_file,"rb")asfile:avro_schema=schema.parse(file.read())defcallback(message:pubsub_v1.subscriber.message.Message)->None:# Get the message serialization type.encoding=message.attributes.get("googclient_schemaencoding")# Deserialize the message data accordingly.ifencoding=="BINARY":bout=io.BytesIO(message.data)decoder=BinaryDecoder(bout)reader=DatumReader(avro_schema)message_data=reader.read(decoder)print(f"Received a binary-encoded message:\n{message_data}")elifencoding=="JSON":message_data=json.loads(message.data)print(f"Received a JSON-encoded message:\n{message_data}")else:print(f"Received a message with no encoding:\n{message}")message.ack()streaming_pull_future=subscriber.subscribe(subscription_path,callback=callback)print(f"Listening for messages on{subscription_path}..\n")# Wrap subscriber in a 'with' block to automatically call close() when done.withsubscriber:try:# When `timeout` is not set, result() will block indefinitely,# unless an exception occurs first.streaming_pull_future.result(timeout=timeout)exceptTimeoutError:streaming_pull_future.cancel()# Trigger the shutdown.streaming_pull_future.result()# Block until the shutdown is complete.

fromconcurrent.futuresimportTimeoutErrorfromgoogle.cloud.pubsubimportSubscriberClientfromgoogle.protobuf.json_formatimportParsefromutilitiesimportus_states_pb2# TODO(developer)# project_id = "your-project-id"# subscription_id = "your-subscription-id"# Number of seconds the subscriber listens for messages# timeout = 5.0subscriber=SubscriberClient()subscription_path=subscriber.subscription_path(project_id,subscription_id)# Instantiate a protoc-generated class defined in `us-states.proto`.state=us_states_pb2.StateProto()defcallback(message:pubsub_v1.subscriber.message.Message)->None:# Get the message serialization type.encoding=message.attributes.get("googclient_schemaencoding")# Deserialize the message data accordingly.ifencoding=="BINARY":state.ParseFromString(message.data)print(f"Received a binary-encoded message:\n{state}")elifencoding=="JSON":Parse(message.data,state)print(f"Received a JSON-encoded message:\n{state}")else:print(f"Received a message with no encoding:\n{message}")message.ack()streaming_pull_future=subscriber.subscribe(subscription_path,callback=callback)print(f"Listening for messages on{subscription_path}..\n")# Wrap subscriber in a 'with' block to automatically call close() when done.withsubscriber:try:# When `timeout` is not set, result() will block indefinitely,# unless an exception occurs first.streaming_pull_future.result(timeout=timeout)exceptTimeoutError:streaming_pull_future.cancel()# Trigger the shutdown.streaming_pull_future.result()# Block until the shutdown is complete.

# subscription_id = "your-subscription-id"# avsc_file = "path/to/an/avro/schema/file/(.avsc)/formatted/in/json"pubsub=Google::Cloud::PubSub.newsubscriber=pubsub.subscribersubscription_idlistener=subscriber.listendo|received_message|encoding=received_message.attributes["googclient_schemaencoding"]caseencodingwhen"BINARY"require"avro"avro_schema=Avro::Schema.parseFile.read(avsc_file)buffer=StringIO.newreceived_message.datadecoder=Avro::IO::BinaryDecoder.newbufferreader=Avro::IO::DatumReader.newavro_schemamessage_data=reader.readdecoderputs"Received a binary-encoded message:\n#{message_data}"when"JSON"require"json"message_data=JSON.parsereceived_message.dataputs"Received a JSON-encoded message:\n#{message_data}"else"Received a message with no encoding:\n#{received_message.message_id}"endreceived_message.acknowledge!endlistener.start# Let the main thread sleep for 60 seconds so the thread for listening# messages does not quitsleep60listener.stop.wait!

# subscription_id = "your-subscription-id"pubsub=Google::Cloud::PubSub.newsubscriber=pubsub.subscribersubscription_idlistener=subscriber.listendo|received_message|encoding=received_message.attributes["googclient_schemaencoding"]caseencodingwhen"BINARY"state=Utilities::StateProto.decodereceived_message.dataputs"Received a binary-encoded message:\n#{state}"when"JSON"require"json"state=Utilities::StateProto.decode_jsonreceived_message.dataputs"Received a JSON-encoded message:\n#{state}"else"Received a message with no encoding:\n#{received_message.message_id}"endreceived_message.acknowledge!endlistener.start# Let the main thread sleep for 60 seconds so the thread for listening# messages does not quitsleep60listener.stop.wait!

import("context""fmt""io""sync""time""cloud.google.com/go/pubsub/v2"schema"cloud.google.com/go/pubsub/v2/apiv1""cloud.google.com/go/pubsub/v2/apiv1/pubsubpb""github.com/linkedin/goavro/v2")funcsubscribeWithAvroSchemaRevisions(wio.Writer,projectID,subIDstring)error{// projectID := "my-project-id"// topicID := "my-topic"ctx:=context.Background()client,err:=pubsub.NewClient(ctx,projectID)iferr!=nil{returnfmt.Errorf("pubsub.NewClient: %w",err)}schemaClient,err:=schema.NewSchemaClient(ctx)iferr!=nil{returnfmt.Errorf("pubsub.NewSchemaClient: %w",err)}// Create the cache for the codecs for different revision IDs.revisionCodecs:=make(map[string]*goavro.Codec)sub:=client.Subscriber(subID)ctx2,cancel:=context.WithTimeout(ctx,10*time.Second)defercancel()varmusync.Mutexsub.Receive(ctx2,func(ctxcontext.Context,msg*pubsub.Message){mu.Lock()defermu.Unlock()name:=msg.Attributes["googclient_schemaname"]revision:=msg.Attributes["googclient_schemarevisionid"]codec,ok:=revisionCodecs[revision]// If the codec doesn't exist in the map, this is the first time we// are seeing this revision. We need to fetch the schema and cache the// codec. It would be more typical to do this asynchronously, but is// shown here in a synchronous way to ease readability.if!ok{s:=&pubsubpb.GetSchemaRequest{Name:fmt.Sprintf("%s@%s",name,revision),View:pubsubpb.SchemaView_FULL,}schema,err:=schemaClient.GetSchema(ctx,s)iferr!=nil{fmt.Fprintf(w,"Nacking, cannot read message without schema: %v\n",err)msg.Nack()return}codec,err=goavro.NewCodec(schema.Definition)iferr!=nil{msg.Nack()fmt.Fprintf(w,"goavro.NewCodec err: %v\n",err)}revisionCodecs[revision]=codec}encoding:=msg.Attributes["googclient_schemaencoding"]varstatemap[string]interface{}ifencoding=="BINARY"{data,_,err:=codec.NativeFromBinary(msg.Data)iferr!=nil{fmt.Fprintf(w,"codec.NativeFromBinary err: %v\n",err)msg.Nack()return}fmt.Fprintf(w,"Received a binary-encoded message:\n%#v\n",data)state=data.(map[string]interface{})}elseifencoding=="JSON"{data,_,err:=codec.NativeFromTextual(msg.Data)iferr!=nil{fmt.Fprintf(w,"codec.NativeFromTextual err: %v\n",err)msg.Nack()return}fmt.Fprintf(w,"Received a JSON-encoded message:\n%#v\n",data)state=data.(map[string]interface{})}else{fmt.Fprintf(w,"Unknown message type(%s), nacking\n",encoding)msg.Nack()return}fmt.Fprintf(w,"%s is abbreviated as %s\n",state["name"],state["post_abbr"])msg.Ack()})returnnil}

importcom.google.cloud.pubsub.v1.AckReplyConsumer;importcom.google.cloud.pubsub.v1.MessageReceiver;importcom.google.cloud.pubsub.v1.SchemaServiceClient;importcom.google.cloud.pubsub.v1.Subscriber;importcom.google.protobuf.ByteString;importcom.google.pubsub.v1.ProjectSubscriptionName;importcom.google.pubsub.v1.PubsubMessage;importcom.google.pubsub.v1.Schema;importjava.io.ByteArrayInputStream;importjava.io.IOException;importjava.io.InputStream;importjava.util.HashMap;importjava.util.Map;importjava.util.concurrent.TimeUnit;importjava.util.concurrent.TimeoutException;importorg.apache.avro.io.Decoder;importorg.apache.avro.io.DecoderFactory;importorg.apache.avro.specific.SpecificDatumReader;importutilities.State;publicclassSubscribeWithAvroSchemaRevisionsExample{publicstaticvoidmain(String...args)throwsException{// TODO(developer): Replace these variables before running the sample.StringprojectId="your-project-id";// Use an existing subscription.StringsubscriptionId="your-subscription-id";subscribeWithAvroSchemaRevisionsExample(projectId,subscriptionId);}staticSchemaServiceClientgetSchemaServiceClient(){try{returnSchemaServiceClient.create();}catch(IOExceptione){System.out.println("Could not get schema client: "+e);returnnull;}}publicstaticvoidsubscribeWithAvroSchemaRevisionsExample(StringprojectId,StringsubscriptionId){// Used to get the schemas for revsions.finalSchemaServiceClientschemaServiceClient=getSchemaServiceClient();if(schemaServiceClient==null){return;}// Cache for the readers for different revision IDs.Map<String,SpecificDatumReader<State>>revisionReaders=newHashMap<String,SpecificDatumReader<State>>();ProjectSubscriptionNamesubscriptionName=ProjectSubscriptionName.of(projectId,subscriptionId);// Instantiate an asynchronous message receiver.MessageReceiverreceiver=(PubsubMessagemessage,AckReplyConsumerconsumer)->{// Get the schema encoding type.Stringname=message.getAttributesMap().get("googclient_schemaname");Stringrevision=message.getAttributesMap().get("googclient_schemarevisionid");SpecificDatumReader<State>reader=null;synchronized(revisionReaders){reader=revisionReaders.get(revision);}if(reader==null){// This is the first time we are seeing this revision. We need to// fetch the schema and cache its decoder. It would be more typical// to do this asynchronously, but is shown here in a synchronous// way to ease readability.try{Schemaschema=schemaServiceClient.getSchema(name+"@"+revision);org.apache.avro.SchemaavroSchema=neworg.apache.avro.Schema.Parser().parse(schema.getDefinition());reader=newSpecificDatumReader<State>(avroSchema,State.getClassSchema());synchronized(revisionReaders){revisionReaders.put(revision,reader);}}catch(Exceptione){System.out.println("Could not get schema: "+e);// Without the schema, we cannot read the message, so nack it.consumer.nack();return;}}ByteStringdata=message.getData();// Send the message data to a byte[] input stream.InputStreaminputStream=newByteArrayInputStream(data.toByteArray());Stringencoding=message.getAttributesMap().get("googclient_schemaencoding");Decoderdecoder=null;// Prepare an appropriate decoder for the message data in the input stream// based on the schema encoding type.try{switch(encoding){case"BINARY":decoder=DecoderFactory.get().directBinaryDecoder(inputStream,/* reuse= */null);System.out.println("Receiving a binary-encoded message:");break;case"JSON":decoder=DecoderFactory.get().jsonDecoder(State.getClassSchema(),inputStream);System.out.println("Receiving a JSON-encoded message:");break;default:System.out.println("Unknown message type; nacking.");consumer.nack();break;}// Obtain an object of the generated Avro class using the decoder.Statestate=reader.read(null,decoder);System.out.println(state.getName()+" is abbreviated as "+state.getPostAbbr());// Ack the message.consumer.ack();}catch(IOExceptione){System.err.println(e);// If we failed to process the message, nack it.consumer.nack();}};Subscribersubscriber=null;try{subscriber=Subscriber.newBuilder(subscriptionName,receiver).build();subscriber.startAsync().awaitRunning();System.out.printf("Listening for messages on %s:\n",subscriptionName.toString());subscriber.awaitTerminated(30,TimeUnit.SECONDS);}catch(TimeoutExceptiontimeoutException){subscriber.stopAsync();}}}

importavro.schemaasschemafromavro.ioimportBinaryDecoder,DatumReaderfromconcurrent.futuresimportTimeoutErrorimportioimportjsonfromgoogle.api_core.exceptionsimportNotFoundfromgoogle.cloud.pubsubimportSchemaServiceClient,SubscriberClientschema_client=SchemaServiceClient()# TODO(developer)# project_id = "your-project-id"# subscription_id = "your-subscription-id"# avsc_file = "path/to/an/avro/schema/file/(.avsc)/formatted/in/json"# Number of seconds the subscriber listens for messages# timeout = 5.0subscriber=SubscriberClient()subscription_path=subscriber.subscription_path(project_id,subscription_id)withopen(avsc_file,"rb")asfile:reader_avro_schema=schema.parse(file.read())# Dict to keep readers for different schema revisions.revisions_to_readers={}defcallback(message:pubsub_v1.subscriber.message.Message)->None:# Get the message serialization type.schema_name=message.attributes.get("googclient_schemaname")schema_revision_id=message.attributes.get("googclient_schemarevisionid")encoding=message.attributes.get("googclient_schemaencoding")ifschema_revision_idnotinrevisions_to_readers:schema_path=schema_name+"@"+schema_revision_idtry:received_avro_schema=schema_client.get_schema(request={"name":schema_path})exceptNotFound:print(f"{schema_path} not found.")message.nack()returnwriter_avro_schema=schema.parse(received_avro_schema.definition)revisions_to_readers[schema_revision_id]=DatumReader(writer_avro_schema,reader_avro_schema)reader=revisions_to_readers[schema_revision_id]# Deserialize the message data accordingly.ifencoding=="BINARY":bout=io.BytesIO(message.data)decoder=BinaryDecoder(bout)message_data=reader.read(decoder)print(f"Received a binary-encoded message:\n{message_data}")elifencoding=="JSON":message_data=json.loads(message.data)print(f"Received a JSON-encoded message:\n{message_data}")else:print(f"Received a message with no encoding:\n{message}")message.nack()message.ack()streaming_pull_future=subscriber.subscribe(subscription_path,callback=callback)print(f"Listening for messages on{subscription_path}..\n")# Wrap subscriber in a 'with' block to automatically call close() when done.withsubscriber:try:# When `timeout` is not set, result() will block indefinitely,# unless an exception occurs first.streaming_pull_future.result(timeout=timeout)exceptTimeoutError:streaming_pull_future.cancel()# Trigger the shutdown.streaming_pull_future.result()# Block until the shutdown is complete.