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| <h1 class="post-title-main">Communication: JSON-RPC</h1> |
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| <!-- |
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| <div class="sect1"> |
| <h2 id="overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In CHE we use <a href="http://www.jsonrpc.org/specification">JSON-RPC</a> for asynchronous communication between clients and servers. JSON-RPC is asymmetric by nature so in order to be able to information independently we use duplex approach where both sides (clients and servers) can act both as a JSON-RPC server and as JSON-RPC client. To make it clear, clients (e.g. IDE) can send JSON-RPC requests (acting as JSON-RPC client) and receive requests (acting as JSON-RPC server) and servers (e.g. workspace master or workspace agent) can do the same.</p> |
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| <div class="sect1"> |
| <h2 id="send-a-json-rpc-request">Send a JSON-RPC request</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To send request you can use <a href="https://github.com/eclipse/che/blob/master/core/che-core-api-core/src/main/java/org/eclipse/che/api/core/jsonrpc/commons/RequestTransmitter.java"><code>org.eclipse.che.api.core.jsonrpc.commons.RequestTransmitter</code></a>, the most basic use case (actual for both client and server sides) looks quite simple:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code data-lang="java">transmitter |
| .newRequest() |
| .endpointId(endpointId) |
| .methodName(method) |
| .paramsAsDto(dto) |
| .sendAndReceiveResultAsDto(dtoClass) |
| .onSuccess((result) -> {}) |
| .onFailure((jsonRpcError) -> {});</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><strong>endpointId</strong> - in common sense can be an arbitrary <strong><code>String</code></strong> identifier that allows to distinguish endpoints. Please note that for server sides these endpoints are statically defined as constants: <code>"ws-agent"</code> for workspace agent and <code>"ws-master"</code> for workspace master for example, while for clients it is a dynamic identifier because clients are dynamic by their nature.</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>method</strong> - method name corresponds to it’s definition in JSON-RPC protocol specification. In Che we use the following naming convention: method name in most cases consists of two parts separated be slash - scope and action. For example <code>project/create</code> where <code>project</code> is the scope and <code>create</code> is the action.</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>dto</strong> - value of parameters passed (in our example it is a <a href="https://en.wikipedia.org/wiki/Data_transfer_object">DTO</a>), please note that though JSON-RPC protocol specification requires parameters either as json objects or arrays, you can use single primitives here as well and they will be automatically converted to a singleton array.</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>dtoClass</strong> - class of a result that will be contained within the response to our request</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>result</strong> - result of our request (in our example it is of class <strong>dtoClass</strong>)</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>jsonRpcError</strong> - error object that contains information about the error if any happened, its structure corresponds to error defined in JSON-RPC protocol specification</p> |
| </div> |
| <div class="paragraph"> |
| <p>Source code example of using of the transmitter can be found here: <a href="https://github.com/eclipse/che/blob/master/wsagent/che-core-api-debug/src/main/java/org/eclipse/che/api/debugger/server/DebuggerJsonRpcMessenger.java#L76" class="bare">https://github.com/eclipse/che/blob/master/wsagent/che-core-api-debug/src/main/java/org/eclipse/che/api/debugger/server/DebuggerJsonRpcMessenger.java#L76</a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="receive-a-json-rpc-request">Receive a JSON-RPC request</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To receive a request you can use <a href="https://github.com/eclipse/che/blob/master/core/che-core-api-core/src/main/java/org/eclipse/che/api/core/jsonrpc/commons/RequestHandlerConfigurator.java"><code>org.eclipse.che.api.core.jsonrpc.commons.RequestHandlerConfigurator</code></a>, the use case (actual for both sides):</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code data-lang="java">configurator |
| .newConfiguration() |
| .methodName(method) |
| .paramsAsDto(paramsDtoClass) |
| .resultAsDto(resultDtoClass) |
| .withFunction((endpointId, paramsDto) -> resultDto);</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><strong>method</strong> - the name of JSON-RPC method that is to be handled by this configuration</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>paramsDtoClass</strong> - class of parameters that are passed in a JSON-RPC request (in our example it is a DTO)</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>resultDtoClass</strong> - class of result that is passed in a JSON-RPC response (in our example it is DTO)</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>endpointId</strong> - the identifier of an endpoint that sends the request that is handled by this configuration</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>paramsDto</strong> - the value of parameters passed</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>resultDto</strong> - the value of result passed</p> |
| </div> |
| <div class="paragraph"> |
| <p>Source code example of using of the transmitter can be found here: <a href="https://github.com/eclipse/che/blob/master/wsagent/che-core-api-debug/src/main/java/org/eclipse/che/api/debugger/server/DebuggerJsonRpcMessenger.java#L117" class="bare">https://github.com/eclipse/che/blob/master/wsagent/che-core-api-debug/src/main/java/org/eclipse/che/api/debugger/server/DebuggerJsonRpcMessenger.java#L117</a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="client-endpoint-identification">Client endpoint identification</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In order to receive a cross sessional identifier clients (e.g. IDE) can use a <a href="https://github.com/eclipse/che/blob/master/core/che-core-api-core/src/main/java/org/eclipse/che/api/core/websocket/impl/WebsocketIdService.java"><code>org.eclipse.che.api.core.websocket.impl.WebsocketIdService</code></a>, otherwise client identifier will not be persisted between websocket sessions. The most common use case (client specific):</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code data-lang="java">requestTransmitter |
| .newRequest() |
| .endpointId(<span class="string"><span class="delimiter">"</span><span class="content">ws-master</span><span class="delimiter">"</span></span>) |
| .methodName(<span class="string"><span class="delimiter">"</span><span class="content">websocketIdService/getId</span><span class="delimiter">"</span></span>) |
| .noParams() |
| .sendAndReceiveResultAsString() |
| .onSuccess(appContext::setApplicationWebsocketId);</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Source code example of using websocket identification service can be found here: <a href="https://github.com/eclipse/che/blob/master/ide/che-core-ide-app/src/main/java/org/eclipse/che/ide/jsonrpc/WsMasterJsonRpcInitializer.java#L134" class="bare">https://github.com/eclipse/che/blob/master/ide/che-core-ide-app/src/main/java/org/eclipse/che/ide/jsonrpc/WsMasterJsonRpcInitializer.java#L134</a></p> |
| </div> |
| </div> |
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