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| <li class="subfolders"> |
| <a href="#"><span></span>→ Policies examples</a> |
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| <li><a href="protocol-examples-policies-modifypolicyentry.html">Modify a single entry</a></li> |
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| <li><a href="protocol-examples-policies-retrievepolicyentry.html">Retrieve a single entry</a></li> |
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| <li><a href="protocol-examples-policies-modifysubjects.html">Modify subjects</a></li> |
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| <li><a href="protocol-examples-policies-retrievesubjects.html">Retrieve subjects</a></li> |
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| <li><a href="protocol-examples-policies-createsubject.html">Create a single subject</a></li> |
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| <li><a href="protocol-examples-policies-retrievesubject.html">Retrieve a single subject</a></li> |
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| <li><a href="protocol-examples-policies-modifyresources.html">Modify resources</a></li> |
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| <li><a href="protocol-examples-policies-announcement-subjectDeletion.html">Announcement for subject deletion</a></li> |
| |
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| <div class="post-header"> |
| <h1 class="post-title-main">AMQP 1.0 protocol binding</h1> |
| </div> |
| |
| |
| |
| <div class="post-content"> |
| |
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| |
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| <div id="toc"></div> |
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| |
| <p>Consume messages from AMQP 1.0 endpoints via <a href="#source-format">sources</a> and send messages to AMQP 1.0 endpoints via |
| <a href="#target-format">targets</a>.</p> |
| |
| <h2 id="content-type">Content-type</h2> |
| |
| <p>When messages are sent in <a href="protocol-overview.html">Ditto Protocol</a> (as <code class="highlighter-rouge">UTF-8</code> encoded String payload), |
| the <code class="highlighter-rouge">content-type</code> of AMQP 1.0 messages must be set to:</p> |
| |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>application/vnd.eclipse.ditto+json |
| </code></pre></div></div> |
| |
| <p>If messages, which are not in Ditto Protocol, should be processed, a <a href="connectivity-mapping.html">payload mapping</a> must |
| be configured for the AMQP 1.0 connection in order to transform the messages.</p> |
| |
| <h2 id="amqp-10-properties-and-application-properties">AMQP 1.0 properties and application properties</h2> |
| |
| <p>When set as external headers by outgoing payload or header mapping, the properties defined by AMQP 1.0 specification are |
| set to the corresponding header value. Conversely, the values of AMQP 1.0 properties are available for incoming payload |
| and header mapping as external headers. The supported AMQP 1.0 properties are:</p> |
| |
| <ul> |
| <li><code class="highlighter-rouge">message-id</code></li> |
| <li><code class="highlighter-rouge">user-id</code></li> |
| <li><code class="highlighter-rouge">to</code></li> |
| <li><code class="highlighter-rouge">subject</code></li> |
| <li><code class="highlighter-rouge">reply-to</code></li> |
| <li><code class="highlighter-rouge">correlation-id</code></li> |
| <li><code class="highlighter-rouge">content-type</code></li> |
| <li><code class="highlighter-rouge">absolute-expiry-time</code></li> |
| <li><code class="highlighter-rouge">creation-time</code></li> |
| <li><code class="highlighter-rouge">group-id</code></li> |
| <li><code class="highlighter-rouge">group-sequence</code></li> |
| <li><code class="highlighter-rouge">reply-to-group-id</code></li> |
| </ul> |
| |
| <p>External headers not on this list are mapped to AMQP application properties. |
| To set an application property whose name is identical to an AMQP 1.0 property, prefix it by |
| <code class="highlighter-rouge">amqp.application.property:</code>. The following <a href="basic-connections.html#target-header-mapping">target header mapping</a> sets |
| the application property <code class="highlighter-rouge">to</code> to the value of the Ditto protocol header <code class="highlighter-rouge">reply-to</code>:</p> |
| <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w"> |
| </span><span class="s2">"headerMapping"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"amqp.application.property:to"</span><span class="p">:</span><span class="w"> </span><span class="s2">"{{ header:reply-to }}"</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
| |
| <p>To read an application property whose name is identical to an AMQP 1.0 property, prefix it by |
| <code class="highlighter-rouge">amqp.application.property:</code>. The following <a href="basic-connections.html#source-header-mapping">source header mapping</a> sets |
| the Ditto protocol header <code class="highlighter-rouge">reply-to</code> to the value of the application property <code class="highlighter-rouge">to</code>:</p> |
| <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w"> |
| </span><span class="s2">"headerMapping"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"reply-to"</span><span class="p">:</span><span class="w"> </span><span class="s2">"{{ header:amqp.application.property:to }}"</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
| |
| <div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> For now, setting or reading the AMQP 1.0 property ‘content-encoding’ is impossible.</div> |
| |
| <h2 id="specific-connection-configuration">Specific connection configuration</h2> |
| |
| <p>The common configuration for connections in <a href="basic-connections.html#sources">Connections > Sources</a> and |
| <a href="basic-connections.html#targets">Connections > Targets</a> applies here as well. |
| Following are some specifics for AMQP 1.0 connections:</p> |
| |
| <h3 id="source-format">Source format</h3> |
| |
| <p>Any <code class="highlighter-rouge">source</code> item defines an <code class="highlighter-rouge">addresses</code> array of source identifiers (e.g. Eclipse Hono’s |
| Telemetry API) to consume messages from, |
| and <code class="highlighter-rouge">authorizationContext</code> array that contains the authorization subjects, in whose context |
| inbound messages are processed. These subjects may contain placeholders, see |
| <a href="basic-connections.html#placeholder-for-source-authorization-subjects">placeholders</a> section for more information.</p> |
| |
| <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w"> |
| </span><span class="s2">"addresses"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> |
| </span><span class="s2">"<source>"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"..."</span><span class="w"> |
| </span><span class="p">],</span><span class="w"> |
| </span><span class="s2">"authorizationContext"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"ditto:inbound-auth-subject"</span><span class="p">,</span><span class="w"> </span><span class="s2">"..."</span><span class="p">]</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
| |
| <h4 id="source-acknowledgement-handling">Source acknowledgement handling</h4> |
| |
| <p>For AMQP 1.0 sources, when configuring |
| <a href="basic-connections.html#source-acknowledgement-requests">acknowledgement requests</a>, consumed messages from the AMQP 1.0 |
| endpoint are treated in the following way:</p> |
| |
| <p>For Ditto acknowledgements with successful <a href="protocol-specification-acks.html#combined-status-code">status</a>:</p> |
| <ul> |
| <li>Acknowledges the AMQP 1.0 message with <code class="highlighter-rouge">accepted</code> outcome (see <a href="http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-messaging-v1.0-os.html#type-accepted">AMQP 1.0 spec: 3.4.2 Accepted</a>)</li> |
| </ul> |
| |
| <p>For Ditto acknowledgements with mixed successful/failed <a href="protocol-specification-acks.html#combined-status-code">status</a>:</p> |
| <ul> |
| <li>If some of the aggregated <a href="basic-acknowledgements.html#acknowledgements-acks">acknowledgements</a> require redelivery (e.g. based on a timeout): |
| <ul> |
| <li>Negatively acknowledges the AMQP 1.0 message with <code class="highlighter-rouge">modified[delivery-failed]</code> outcome (see <a href="http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-messaging-v1.0-os.html#type-modified">AMQP 1.0 spec: 3.4.5 Modified</a>)</li> |
| </ul> |
| </li> |
| <li>If none of the aggregated <a href="basic-acknowledgements.html#acknowledgements-acks">acknowledgements</a> require redelivery: |
| <ul> |
| <li>Negatively acknowledges the AMQP 1.0 message with <code class="highlighter-rouge">rejected</code> outcome (see <a href="http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-messaging-v1.0-os.html#type-rejected">AMQP 1.0 spec: 3.4.3 Rejected</a>) preventing redelivery by the AMQP 1.0 endpoint</li> |
| </ul> |
| </li> |
| </ul> |
| |
| <h3 id="target-format">Target format</h3> |
| |
| <p>An AMQP 1.0 connection requires the protocol configuration target object to have an <code class="highlighter-rouge">address</code> property with a source |
| identifier. The target address may contain placeholders; see |
| <a href="basic-connections.html#placeholder-for-target-addresses">placeholders</a> section for more |
| information.</p> |
| |
| <p>Target addresses for AMQP 1.0 are by default handled as AMQP 1.0 “queues”. There is however the possibility to also |
| configure AMQP 1.0 “topics” as well. In fact, the following formats for the <code class="highlighter-rouge">address</code> are |
| supported:</p> |
| <ul> |
| <li><code class="highlighter-rouge">the-queue-name</code> (when configuring w/o prefix, the <code class="highlighter-rouge">address</code> is handled as “queue”)</li> |
| <li><code class="highlighter-rouge">queue://the-queue-name</code></li> |
| <li><code class="highlighter-rouge">topic://the-topic-name</code></li> |
| </ul> |
| |
| <p>Further, <code class="highlighter-rouge">"topics"</code> is a list of strings, each list entry representing a subscription of |
| <a href="protocol-specification-topic.html">Ditto protocol topics</a>, see |
| <a href="basic-connections.html#target-topics-and-filtering">target topics and filtering</a> for more information on that.</p> |
| |
| <p>Outbound messages are published to the configured target address if one of the subjects in <code class="highlighter-rouge">"authorizationContext"</code> |
| has READ permission on the thing, which is associated with a message.</p> |
| |
| <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w"> |
| </span><span class="s2">"address"</span><span class="p">:</span><span class="w"> </span><span class="s2">"<target>"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"topics"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> |
| </span><span class="s2">"_/_/things/twin/events"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"_/_/things/live/messages"</span><span class="w"> |
| </span><span class="p">],</span><span class="w"> |
| </span><span class="s2">"authorizationContext"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"ditto:outbound-auth-subject"</span><span class="p">,</span><span class="w"> </span><span class="s2">"..."</span><span class="p">]</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
| |
| <h4 id="target-acknowledgement-handling">Target acknowledgement handling</h4> |
| |
| <p>For AMQP 1.0 targets, when configuring |
| <a href="basic-connections.html#target-issued-acknowledgement-label">automatically issued acknowledgement labels</a>, requested |
| acknowledgements are produced in the following way:</p> |
| |
| <p>Once the AMQP 1.0 client signals that the message was acknowledged by the AMQP 1.0 endpoint, the following information |
| is mapped to the automatically created <a href="protocol-specification-acks.html#acknowledgement">acknowledgement</a>:</p> |
| |
| <ul> |
| <li>Acknowledgement.status: |
| <ul> |
| <li>will be <code class="highlighter-rouge">200</code>, if the message was successfully consumed by the AMQP 1.0 endpoint</li> |
| <li>will be <code class="highlighter-rouge">5xx</code>, if the AMQP 1.0 endpoint failed in consuming the message, retrying sending the message is feasible</li> |
| </ul> |
| </li> |
| <li>Acknowledgement.value: |
| <ul> |
| <li>will be missing, for status <code class="highlighter-rouge">200</code></li> |
| <li>will contain more information, in case that an error <code class="highlighter-rouge">status</code> was set</li> |
| </ul> |
| </li> |
| </ul> |
| |
| <h3 id="specific-configuration-properties">Specific configuration properties</h3> |
| |
| <p>The specific configuration properties are interpreted as |
| <a href="https://qpid.apache.org/releases/qpid-jms-0.40.0/docs/index.html#jms-configuration-options">JMS Configuration options</a>. |
| Use these to customize and tweak your connection as needed.</p> |
| |
| <h2 id="establishing-connecting-to-an-amqp-10-endpoint">Establishing connecting to an AMQP 1.0 endpoint</h2> |
| |
| <p>Ditto’s <a href="architecture-services-connectivity.html">Connectivity service</a> is responsible for creating new and managing |
| existing connections.</p> |
| |
| <p>This can be done dynamically at runtime without the need to restart any microservice using a |
| <a href="installation-operating.html#devops-commands">Ditto DevOps command</a>.</p> |
| |
| <p>Example connection configuration to create a new AMQP 1.0 connection:</p> |
| |
| <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w"> |
| </span><span class="s2">"id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"hono-example-connection-123"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"connectionType"</span><span class="p">:</span><span class="w"> </span><span class="s2">"amqp-10"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"connectionStatus"</span><span class="p">:</span><span class="w"> </span><span class="s2">"open"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"failoverEnabled"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"uri"</span><span class="p">:</span><span class="w"> </span><span class="s2">"amqps://user:password@hono.eclipse.org:5671"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"sources"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> |
| </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"addresses"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> |
| </span><span class="s2">"telemetry/FOO"</span><span class="w"> |
| </span><span class="p">],</span><span class="w"> |
| </span><span class="s2">"authorizationContext"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"ditto:inbound-auth-subject"</span><span class="p">]</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">],</span><span class="w"> |
| </span><span class="s2">"targets"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> |
| </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"address"</span><span class="p">:</span><span class="w"> </span><span class="s2">"events/twin"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"topics"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> |
| </span><span class="s2">"_/_/things/twin/events"</span><span class="w"> |
| </span><span class="p">],</span><span class="w"> |
| </span><span class="s2">"authorizationContext"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"ditto:outbound-auth-subject"</span><span class="p">]</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">]</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
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