WGTWO API Docs

Get handset change events

Prerequisites

  1. An OAuth 2.0 client
  2. A client access token

Required scope

subscription.handset_details:read

Code

TIP

You can test our APIs without authorization by targetting sandbox.api.wgtwo.com instead of api.wgtwo.com and removing any authorization from the request/code sample.

Download proto definitions
curl -sL 'https://github.com/working-group-two/wgtwoapis/blob/master/image.bin?raw=true' -o wgtwo.bin
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export ACCESS_TOKEN="my_client_access_token"
grpcurl -protoset wgtwo.bin \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -d '
  {
    "stream_configuration": {
      "regular": {},
      "disable_explicit_ack": {}
    }
  }
  ' \
  api.wgtwo.com:443 \
  wgtwo.subscription.v1.SubscriptionEventService/StreamHandsetChangeEvents
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About stream_configuration

For testing purposes, we include the config:

"stream_configuration": {
  "regular": {},              Reading position will not be stored in the server and load is not spread between your clients 
  "disable_explicit_ack": {}  Let events be automatically acked
}
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By default, load will automatically be spread between all connections using the same OAuth 2.0 client and you will need to reply with a ack once your service has handled the message. This is also what we would recommend for real production usage.

See configuring event streaming for details.

Example result

{
  "metadata": {
    "timestamp": "2021-09-30T14:27:55.468Z",
    "identifier": {
      "subscriptionIdentifier": {
        "value": "ce78..."
      }
    },
    "ackInfo": {
      "value": "Ch5..."
    }
  },
  "handsetChangeEvent": {
    "previous": {
      "imeiSv": {
        "imei": "867...",
        "softwareVersion": "64"
      }
    },
    "current": {
      "imeiSv": {
        "imei": "867...",
        "softwareVersion": "65"
      }
    },
    "imsi": {
      "value": "Rn..."
    }
  }
}
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Install dependencies

Maven

<dependency>
  <groupId>com.wgtwo.api.v1.grpc</groupId>
  <artifactId>subscription</artifactId>
  <version>1.8.0</version>
</dependency>

search.maven.org/search?q=g:com.wgtwo.api.v1.grpcopen in new window

package com.example.handsetchange

import com.google.common.util.concurrent.ThreadFactoryBuilder
import com.wgtwo.api.v1.events.EventsProto
import com.wgtwo.api.v1.events.EventsProto.AckInfo
import com.wgtwo.api.v1.subscription.SubscriptionEventServiceGrpc
import com.wgtwo.api.v1.subscription.SubscriptionEventsProto
import com.wgtwo.api.v1.subscription.SubscriptionEventsProto.AckHandsetChangeEventRequest
import com.wgtwo.api.v1.subscription.SubscriptionEventsProto.AckHandsetChangeEventResponse
import com.wgtwo.api.v1.subscription.SubscriptionEventsProto.StreamHandsetChangeEventsResponse
import io.grpc.CallCredentials
import io.grpc.Context
import io.grpc.ManagedChannelBuilder
import io.grpc.Metadata
import io.grpc.Status
import io.grpc.StatusException
import io.grpc.StatusRuntimeException
import io.grpc.stub.StreamObserver
import java.util.concurrent.Executor
import java.util.concurrent.Executors
import java.util.concurrent.TimeUnit
import java.util.concurrent.atomic.AtomicBoolean
import java.util.function.Supplier

fun main() {
    EventHandler.start()
    Thread.sleep(60_000)
    EventHandler.close()
}

object EventHandler {
    private val isSandboxed = true // Toggle this to go live
    private val api = if (!isSandboxed) "api.wgtwo.com" else "sandbox.api.wgtwo.com"
    private val channel = ManagedChannelBuilder.forAddress(api, 443).build()
    private val subscriptionEvents = SubscriptionEventServiceGrpc.newStub(channel).apply {
        if (!isSandboxed) { // credentials are needed outside sandbox environment
            this.withCallCredentials(BearerToken { "MY_CLIENT_ACCESS_TOKEN" })
        }
    }

    private val maxInFlight: Int = 10
    private val context = Context.current().fork().withCancellation()
    private val started = AtomicBoolean()
    private val streamExecutor = Executors.newSingleThreadScheduledExecutor()
    private val processExecutor = Executors.newFixedThreadPool(maxInFlight, thread("event-pool-%d"))

    fun start() {
        if (started.getAndSet(true)) {
            return
        }
        streamExecutor.submit(EventHandler::run)
    }

    private fun run() {
        println("Starting subscription")
        val request =
            SubscriptionEventsProto.StreamHandsetChangeEventsRequest.newBuilder()
                .setStreamConfiguration(
                    EventsProto.StreamConfiguration.newBuilder()
                        .setMaxInFlight(maxInFlight)
                )
                .build()
        context.run {
            subscriptionEvents.streamHandsetChangeEvents(
                request,
                handsetChangeObserver
            )
        }
    }

    private fun ack(ackInfo: AckInfo) {
        val request = AckHandsetChangeEventRequest.newBuilder().setAckInfo(ackInfo).build()
        subscriptionEvents.ackHandsetChangeEvent(request, ackObserver)
    }

    private val handsetChangeObserver = object : StreamObserver<StreamHandsetChangeEventsResponse> {
        override fun onNext(response: StreamHandsetChangeEventsResponse) {
            processExecutor.submit {
                try {
                    println(response)
                } catch (e: Exception) {
                    println("Could not process event. e = $e")
                } finally {
                    ack(response.metadata.ackInfo)
                }
            }
        }

        override fun onError(t: Throwable) {
            val code = code(t)
            if (code == Status.Code.CANCELLED) {
                println("Cancelled - Good bye!")
                return
            }
            val delaySeconds =
                when (code) {
                    Status.Code.UNAUTHENTICATED, Status.Code.PERMISSION_DENIED -> 10L
                    else -> 1L
                }
            println("Got onError with code=${code} - restart in $delaySeconds seconds")
            streamExecutor.schedule(EventHandler::run, delaySeconds, TimeUnit.SECONDS)
        }

        override fun onCompleted() = Unit

        fun code(throwable: Throwable): Status.Code =
            when (throwable) {
                is StatusRuntimeException -> throwable.status.code
                is StatusException -> throwable.status.code
                else -> Status.Code.UNKNOWN
            }
    }

    private val ackObserver = object : StreamObserver<AckHandsetChangeEventResponse> {
        override fun onNext(value: AckHandsetChangeEventResponse) =
            when (value.ackStatus.statusCode) {
                EventsProto.AckStatus.StatusCode.STATUS_CODE_SUCCESS ->
                    println("Ack success")
                else -> println("Ack failed: ${value.ackStatus}")
            }

        override fun onError(t: Throwable) = println("onError. $t")
        override fun onCompleted() = Unit
    }


    private fun thread(format: String) = ThreadFactoryBuilder().setNameFormat(format).build()

    fun close() {
        println("Starting shutdown...")
        context.cancel(null)
        streamExecutor.shutdown()
        streamExecutor.awaitTermination(10, TimeUnit.SECONDS)
        processExecutor.shutdown()
        processExecutor.awaitTermination(20, TimeUnit.SECONDS)
        channel.shutdown().awaitTermination(10, TimeUnit.SECONDS)
        println("Shutdown complete.")
    }
}

class BearerToken(private val tokenSupplier: Supplier<String>) : CallCredentials() {
    override fun applyRequestMetadata(
        requestInfo: RequestInfo, executor: Executor, metadataApplier: MetadataApplier
    ) {
        executor.execute {
            try {
                val headers = Metadata()
                val token = tokenSupplier.get()
                headers.put(AUTH_HEADER, "Bearer $token")
                metadataApplier.apply(headers)
            } catch (e: Throwable) {
                metadataApplier.fail(Status.UNAUTHENTICATED.withCause(e))
            }
        }
    }

    override fun thisUsesUnstableApi() {}

    companion object {
        private val AUTH_HEADER = Metadata.Key.of("authorization", Metadata.ASCII_STRING_MARSHALLER)
    }
}
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Example result

metadata {
  timestamp {
    seconds: 1635326429
    nanos: 93000000
  }
  identifier {
    subscription_identifier {
      value: "dummy:se:0"
    }
  }
}
handset_change_event {
  previous {
    imei_sv {
      imei: "359237066557492"
      software_version: "00"
    }
  }
  current {
    imei_sv {
      imei: "353752084447134"
      software_version: "00"
    }
  }
  imsi {
    value: "33"
  }
}

# Ack success
metadata {
  timestamp {
    seconds: 1635326429
    nanos: 193000000
  }
  identifier {
    subscription_identifier {
      value: "dummy:se:0"
    }
  }
}
handset_change_event {
  previous {
    imei_sv {
      imei: "353752084447134"
      software_version: "00"
    }
  }
  current {
    imei_sv {
      imei: "355330105977849"
      software_version: "00"
    }
  }
  imsi {
    value: "33"
  }
}

# Ack success
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