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Opamp client api (#1835)
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‎opamp-client/build.gradle.kts‎

Lines changed: 67 additions & 3 deletions
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import de.undercouch.gradle.tasks.download.Download
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import de.undercouch.gradle.tasks.download.DownloadExtension
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import groovy.json.JsonSlurper
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plugins {
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id("otel.java-conventions")
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id("de.undercouch.download") version "5.6.0"
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id("com.squareup.wire") version "5.3.1"
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}
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description = "Client implementation of the OpAMP spec."
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otelJava.moduleName.set("io.opentelemetry.contrib.opamp.client")
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java {
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sourceCompatibility = JavaVersion.VERSION_1_8
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targetCompatibility = JavaVersion.VERSION_1_8
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dependencies {
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annotationProcessor("com.google.auto.value:auto-value")
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compileOnly("com.google.auto.value:auto-value-annotations")
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}
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val opampReleaseInfo = tasks.register<Download>("opampLastReleaseInfo") {
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group = "opamp"
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src("https://api.github.com/repos/open-telemetry/opamp-spec/releases/latest")
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dest(project.layout.buildDirectory.file("opamp/release.json"))
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}
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val opampProtos = tasks.register<DownloadOpampProtos>("opampProtoDownload", download)
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opampProtos.configure {
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group = "opamp"
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dependsOn(opampReleaseInfo)
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lastReleaseInfoJson.set {
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opampReleaseInfo.get().dest
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}
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outputProtosDir.set(project.layout.buildDirectory.dir("opamp/protos"))
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downloadedZipFile.set(project.layout.buildDirectory.file("intermediate/$name/release.zip"))
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}
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wire {
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java {}
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sourcePath {
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srcDir(opampProtos)
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}
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}
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abstract class DownloadOpampProtos @Inject constructor(
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private val download: DownloadExtension,
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private val archiveOps: ArchiveOperations,
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private val fileOps: FileSystemOperations,
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) : DefaultTask() {
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@get:InputFile
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abstract val lastReleaseInfoJson: RegularFileProperty
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@get:OutputDirectory
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abstract val outputProtosDir: DirectoryProperty
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@get:Internal
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abstract val downloadedZipFile: RegularFileProperty
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@Suppress("UNCHECKED_CAST")
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@TaskAction
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fun execute() {
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val releaseInfo = JsonSlurper().parse(lastReleaseInfoJson.get().asFile) as Map<String, String>
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val zipUrl = releaseInfo["zipball_url"]
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download.run {
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src(zipUrl)
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dest(downloadedZipFile)
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}
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val protos = archiveOps.zipTree(downloadedZipFile).matching {
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setIncludes(listOf("**/*.proto"))
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}
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fileOps.sync {
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from(protos.files)
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into(outputProtosDir)
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}
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}
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}

‎opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/OpampClient.java‎

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/*
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* Copyright The OpenTelemetry Authors
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* SPDX-License-Identifier: Apache-2.0
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*/
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package io.opentelemetry.opamp.client.internal;
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import io.opentelemetry.opamp.client.internal.response.MessageData;
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import opamp.proto.AgentDescription;
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import opamp.proto.RemoteConfigStatus;
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import opamp.proto.ServerErrorResponse;
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public interface OpampClient {
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/**
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* Starts the client and begin attempts to connect to the Server. Once connection is established
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* the client will attempt to maintain it by reconnecting if the connection is lost. All failed
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* connection attempts will be reported via {@link Callbacks#onConnectFailed(OpampClient,
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* Throwable)} callback.
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*
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* <p>This method does not wait until the connection to the Server is established and will likely
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* return before the connection attempts are even made.
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*
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* <p>This method may be called only once.
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*
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* @param callbacks The Callback to which the Client will notify about any Server requests and
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* responses.
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*/
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void start(Callbacks callbacks);
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/**
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* Stops the client. May be called only after {@link #start(Callbacks)}. May be called only once.
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* After this call returns successfully it is guaranteed that no callbacks will be called. Once
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* stopped, the client cannot be started again.
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*/
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void stop();
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/**
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* Sets attributes of the Agent. The attributes will be included in the next status report sent to
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* the Server. When called after {@link #start(Callbacks)}, the attributes will be included in the
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* next outgoing status report. This is typically used by Agents which allow their
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* AgentDescription to change dynamically while the OpAMPClient is started. May be also called
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* from {@link Callbacks#onMessage(OpampClient, MessageData)}.
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*
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* @param agentDescription The new agent description.
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*/
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void setAgentDescription(AgentDescription agentDescription);
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/**
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* Sets the current remote config status which will be sent in the next agent to server request.
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*
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* @param remoteConfigStatus The new remote config status.
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*/
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void setRemoteConfigStatus(RemoteConfigStatus remoteConfigStatus);
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interface Callbacks {
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/**
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* Called when the connection is successfully established to the Server. May be called after
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* {@link #start(Callbacks)} is called and every time a connection is established to the Server.
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* For WebSocket clients this is called after the handshake is completed without any error. For
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* HTTP clients this is called for any request if the response status is OK.
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*
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* @param client The relevant {@link OpampClient} instance.
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*/
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void onConnect(OpampClient client);
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/**
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* Called when the connection to the Server cannot be established. May be called after {@link
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* #start(Callbacks)} is called and tries to connect to the Server. May also be called if the
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* connection is lost and reconnection attempt fails.
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*
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* @param client The relevant {@link OpampClient} instance.
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* @param throwable The exception.
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*/
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void onConnectFailed(OpampClient client, Throwable throwable);
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/**
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* Called when the Server reports an error in response to some previously sent request. Useful
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* for logging purposes. The Agent should not attempt to process the error by reconnecting or
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* retrying previous operations. The client handles the ErrorResponse_UNAVAILABLE case
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* internally by performing retries as necessary.
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*
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* @param client The relevant {@link OpampClient} instance.
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* @param errorResponse The error returned by the Server.
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*/
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void onErrorResponse(OpampClient client, ServerErrorResponse errorResponse);
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/**
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* Called when the Agent receives a message that needs processing. See {@link MessageData}
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* definition for the data that may be available for processing. During onMessage execution the
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* {@link OpampClient} functions that change the status of the client may be called, e.g. if
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* RemoteConfig is processed then {@link #setRemoteConfigStatus(opamp.proto.RemoteConfigStatus)}
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* should be called to reflect the processing result. These functions may also be called after
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* onMessage returns. This is advisable if processing can take a long time. In that case
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* returning quickly is preferable to avoid blocking the {@link OpampClient}.
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*
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* @param client The relevant {@link OpampClient} instance.
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* @param messageData The server response data that needs processing.
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*/
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void onMessage(OpampClient client, MessageData messageData);
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}
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}

‎opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/response/MessageData.java‎

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/*
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* Copyright The OpenTelemetry Authors
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* SPDX-License-Identifier: Apache-2.0
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*/
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package io.opentelemetry.opamp.client.internal.response;
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import com.google.auto.value.AutoValue;
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import io.opentelemetry.opamp.client.internal.OpampClient;
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import javax.annotation.Nullable;
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import opamp.proto.AgentRemoteConfig;
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/**
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* Data class provided in {@link OpampClient.Callbacks#onMessage(OpampClient, MessageData)} with
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* Server's provided status changes.
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*/
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@AutoValue
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public abstract class MessageData {
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@Nullable
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public abstract AgentRemoteConfig getRemoteConfig();
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public static Builder builder() {
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return new AutoValue_MessageData.Builder();
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}
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@AutoValue.Builder
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public abstract static class Builder {
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public abstract Builder setRemoteConfig(AgentRemoteConfig remoteConfig);
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public abstract MessageData build();
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}
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}

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