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| <h1 class="post-title-main">Cloud Events HTTP protocol binding</h1> |
| </div> |
| |
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| <div class="post-content"> |
| |
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| <p>Implements the <a href="https://github.com/cloudevents/spec/blob/v1.0/http-protocol-binding.md">HTTP Protocol Binding for CloudEvents - Version 1.0</a>.</p> |
| |
| <p>Unless mentioned otherwise, the endpoint following the Cloud Events specification for the HTTP binding in version 1.0.</p> |
| |
| <h2 id="cloud-events-features">Cloud Events features</h2> |
| |
| <p>The Cloud Events endpoint provides an alternative to the other connectivity APIs to stream data into your instance.</p> |
| |
| <h2 id="cloud-events-endpoint">Cloud Events endpoint</h2> |
| |
| <p>The Cloud Events endpoint is accessible at these URLs (depending on which API version to use):</p> |
| |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>http://localhost:8080/api/1/cloudevents |
| http://localhost:8080/api/2/cloudevents |
| </code></pre></div></div> |
| |
| <h3 id="authentication">Authentication</h3> |
| |
| <p>A user who connects to the Cloud Events endpoint can be authenticated by using</p> |
| |
| <ul> |
| <li>HTTP BASIC Authentication by providing a username and the password of a user managed within nginx or</li> |
| <li>a JSON Web Token (JWT) issued by an OpenID connect provider.</li> |
| </ul> |
| |
| <p>See <a href="basic-auth.html">Authenticate</a> for more details.</p> |
| |
| <h2 id="cloud-events-protocol-format">Cloud Events protocol format</h2> |
| |
| <p>The source must be a Cloud Event, encoded in the format for the HTTP binding. It may be encoded in <em>binary content mode</em> |
| or in <em>structural content mode</em>.</p> |
| |
| <p>The <em>data content type</em> of the event must be <code class="highlighter-rouge">application/json</code>.</p> |
| |
| <p>The <em>data schema</em> must start with <code class="highlighter-rouge">ditto:</code>, for example <code class="highlighter-rouge">ditto:some-schema</code>.</p> |
| |
| <p>The events <em>payload</em> must in the Ditto Protocol JSON format as defined in the |
| <a href="protocol-specification.html">Protocol specification</a>.</p> |
| |
| <h2 id="publishing-events-to-the-endpoint">Publishing events to the endpoint</h2> |
| |
| <p>Publishing events to the endpoint can be done by directly sending HTTP requests, conforming to the Cloud Events |
| HTTP binding specification. Or by using other technologies that have adopted Cloud Events.</p> |
| |
| <h3 id="knative-eventing">Knative eventing</h3> |
| |
| <p>The endpoint can directly be configured as a <a href="https://knative.dev/docs/eventing/">Knative eventing</a> destination.</p> |
| |
| <p>In the following example, a Knative eventing flow is configured to normalize the payload with a Vorto converter |
| and send the result to Ditto’s cloud events endpoint:</p> |
| |
| <div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">apiVersion</span><span class="pi">:</span> <span class="s">flows.knative.dev/v1</span> |
| <span class="na">kind</span><span class="pi">:</span> <span class="s">Sequence</span> |
| <span class="na">metadata</span><span class="pi">:</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">digital-twin</span> |
| <span class="na">spec</span><span class="pi">:</span> |
| <span class="na">channelTemplate</span><span class="pi">:</span> |
| <span class="na">apiVersion</span><span class="pi">:</span> <span class="s">messaging.knative.dev/v1alpha1</span> |
| <span class="na">kind</span><span class="pi">:</span> <span class="s">KafkaChannel</span> |
| <span class="na">spec</span><span class="pi">:</span> |
| <span class="na">numPartitions</span><span class="pi">:</span> <span class="s">1</span> |
| <span class="na">replicationFactor</span><span class="pi">:</span> <span class="s">1</span> |
| <span class="na">steps</span><span class="pi">:</span> |
| <span class="pi">-</span> <span class="na">ref</span><span class="pi">:</span> |
| <span class="c1"># Convert incoming payload to the Ditto format</span> |
| <span class="na">apiVersion</span><span class="pi">:</span> <span class="s">serving.knative.dev/v1</span> |
| <span class="na">kind</span><span class="pi">:</span> <span class="s">Service</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">vorto-converter</span> |
| <span class="na">namespace</span><span class="pi">:</span> <span class="s">digital-twin</span> |
| <span class="na">reply</span><span class="pi">:</span> |
| <span class="c1"># Deliver to Ditto Cloud Events endpoint</span> |
| <span class="na">uri</span><span class="pi">:</span> <span class="s">http://ditto:ditto@ditto-nginx.digital-twin.svc.cluster.local:8080/api/2/cloudevents</span> |
| </code></pre></div></div> |
| |
| <p>This sequence itself can again be the target of another operation.</p> |
| |
| <h3 id="direct-invocation">Direct invocation</h3> |
| |
| <p>Of course, it is also possible to directly access the Cloud Events endpoint through HTTP:</p> |
| |
| <p>An example HTTP request could look like this:</p> |
| |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>POST /api/2/cloudevents HTTP/1.1 |
| ce-specversion: 1.0 |
| ce-type: my.ditto.event |
| ce-time: 2020-11-24T14:35:00Z |
| ce-id: f7b197fe-2e59-11eb-a8f4-d45d6455d2cc |
| ce-source: /my/source |
| ce-dataschema: ditto:some-schema |
| Content-Type: application/json; charset=utf-8 |
| |
| { |
| ... Ditto Protocol JSON ... |
| } |
| </code></pre></div></div> |
| |
| <p>For more information, see <a href="https://github.com/cloudevents/spec/blob/v1.0/http-protocol-binding.md">HTTP Protocol Binding for CloudEvents - Version 1.0</a>.</p> |
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