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<a href="#pub-attribs">Data Fields</a>  </div>
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<div class="title">grpc_metadata_credentials_plugin Struct Reference</div>  </div>
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<p>grpc_metadata_credentials plugin is an API user provided structure used to create grpc_credentials objects that can be set on a channel (composed) or a call.  
 <a href="structgrpc__metadata__credentials__plugin.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="grpc__security_8h_source.html">grpc_security.h</a>&gt;</code></p>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:af8506ea31e5709124899e4e406b4a9f1"><td class="memItemLeft" align="right" valign="top">int(*&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structgrpc__metadata__credentials__plugin.html#af8506ea31e5709124899e4e406b4a9f1">get_metadata</a> )(void *<a class="el" href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">state</a>, <a class="el" href="structgrpc__auth__metadata__context.html">grpc_auth_metadata_context</a> context, <a class="el" href="grpc__security_8h.html#a08c13ff956af9e64b514c4af434faba2">grpc_credentials_plugin_metadata_cb</a> cb, void *user_data, <a class="el" href="structgrpc__metadata.html">grpc_metadata</a> creds_md[4], size_t *num_creds_md, <a class="el" href="impl_2codegen_2status_8h.html#a35ab2a68917eb836de84cb23253108eb">grpc_status_code</a> *status, const char **error_details)</td></tr>
<tr class="memdesc:af8506ea31e5709124899e4e406b4a9f1"><td class="mdescLeft">&#160;</td><td class="mdescRight">The implementation of this method has to be non-blocking, but can be performed synchronously or asynchronously.  <a href="structgrpc__metadata__credentials__plugin.html#af8506ea31e5709124899e4e406b4a9f1">More...</a><br /></td></tr>
<tr class="separator:af8506ea31e5709124899e4e406b4a9f1"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a58e0aae253e35575146dc6b3252e8f55"><td class="memItemLeft" align="right" valign="top">char *(*&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structgrpc__metadata__credentials__plugin.html#a58e0aae253e35575146dc6b3252e8f55">debug_string</a> )(void *<a class="el" href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">state</a>)</td></tr>
<tr class="memdesc:a58e0aae253e35575146dc6b3252e8f55"><td class="mdescLeft">&#160;</td><td class="mdescRight">Implements debug string of the given plugin.  <a href="structgrpc__metadata__credentials__plugin.html#a58e0aae253e35575146dc6b3252e8f55">More...</a><br /></td></tr>
<tr class="separator:a58e0aae253e35575146dc6b3252e8f55"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a445b45204d00f76d957a6065cc117cc6"><td class="memItemLeft" align="right" valign="top">void(*&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structgrpc__metadata__credentials__plugin.html#a445b45204d00f76d957a6065cc117cc6">destroy</a> )(void *<a class="el" href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">state</a>)</td></tr>
<tr class="memdesc:a445b45204d00f76d957a6065cc117cc6"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destroys the plugin state.  <a href="structgrpc__metadata__credentials__plugin.html#a445b45204d00f76d957a6065cc117cc6">More...</a><br /></td></tr>
<tr class="separator:a445b45204d00f76d957a6065cc117cc6"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a3b571f8cbf3cffd887dec1ed5a662571"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">state</a></td></tr>
<tr class="memdesc:a3b571f8cbf3cffd887dec1ed5a662571"><td class="mdescLeft">&#160;</td><td class="mdescRight">State that will be set as the first parameter of the methods above.  <a href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">More...</a><br /></td></tr>
<tr class="separator:a3b571f8cbf3cffd887dec1ed5a662571"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a6c02843e7eff42cb3b397800bd64f2dc"><td class="memItemLeft" align="right" valign="top">const char *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structgrpc__metadata__credentials__plugin.html#a6c02843e7eff42cb3b397800bd64f2dc">type</a></td></tr>
<tr class="memdesc:a6c02843e7eff42cb3b397800bd64f2dc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Type of credentials that this plugin is implementing.  <a href="structgrpc__metadata__credentials__plugin.html#a6c02843e7eff42cb3b397800bd64f2dc">More...</a><br /></td></tr>
<tr class="separator:a6c02843e7eff42cb3b397800bd64f2dc"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>grpc_metadata_credentials plugin is an API user provided structure used to create grpc_credentials objects that can be set on a channel (composed) or a call. </p>
<p>See grpc_credentials_metadata_create_from_plugin below. The grpc client stack will call the get_metadata method of the plugin for every call in scope for the credentials created from it. </p>
</div><h2 class="groupheader">Field Documentation</h2>
<a id="a58e0aae253e35575146dc6b3252e8f55"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a58e0aae253e35575146dc6b3252e8f55">&#9670;&nbsp;</a></span>debug_string</h2>

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          <td class="memname">char*(* grpc_metadata_credentials_plugin::debug_string) (void *<a class="el" href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">state</a>)</td>
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<p>Implements debug string of the given plugin. </p>
<p>This method returns an allocated string that the caller needs to free using <a class="el" href="alloc_8h.html#a7f8641de6e80a37dd003d3100cc94bd7" title="free">gpr_free()</a> </p>

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<a id="a445b45204d00f76d957a6065cc117cc6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a445b45204d00f76d957a6065cc117cc6">&#9670;&nbsp;</a></span>destroy</h2>

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          <td class="memname">void(* grpc_metadata_credentials_plugin::destroy) (void *<a class="el" href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">state</a>)</td>
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<p>Destroys the plugin state. </p>

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<a id="af8506ea31e5709124899e4e406b4a9f1"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af8506ea31e5709124899e4e406b4a9f1">&#9670;&nbsp;</a></span>get_metadata</h2>

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          <td class="memname">int(* grpc_metadata_credentials_plugin::get_metadata) (void *<a class="el" href="structgrpc__metadata__credentials__plugin.html#a3b571f8cbf3cffd887dec1ed5a662571">state</a>, <a class="el" href="structgrpc__auth__metadata__context.html">grpc_auth_metadata_context</a> context, <a class="el" href="grpc__security_8h.html#a08c13ff956af9e64b514c4af434faba2">grpc_credentials_plugin_metadata_cb</a> cb, void *user_data, <a class="el" href="structgrpc__metadata.html">grpc_metadata</a> creds_md[4], size_t *num_creds_md, <a class="el" href="impl_2codegen_2status_8h.html#a35ab2a68917eb836de84cb23253108eb">grpc_status_code</a> *status, const char **error_details)</td>
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<p>The implementation of this method has to be non-blocking, but can be performed synchronously or asynchronously. </p>
<p>If processing occurs synchronously, returns non-zero and populates creds_md, num_creds_md, status, and error_details. In this case, the caller takes ownership of the entries in creds_md and of error_details. Note that if the plugin needs to return more than GRPC_METADATA_CREDENTIALS_PLUGIN_SYNC_MAX entries in creds_md, it must return asynchronously.</p>
<p>If processing occurs asynchronously, returns zero and invokes <em>cb</em> when processing is completed. <em>user_data</em> will be passed as the first parameter of the callback. NOTE: <em>cb</em> MUST be invoked in a different thread, not from the thread in which <em><a class="el" href="structgrpc__metadata__credentials__plugin.html#af8506ea31e5709124899e4e406b4a9f1" title="The implementation of this method has to be non-blocking, but can be performed synchronously or async...">get_metadata()</a></em> is invoked.</p>
<p><em>context</em> is the information that can be used by the plugin to create auth metadata. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a3b571f8cbf3cffd887dec1ed5a662571">&#9670;&nbsp;</a></span>state</h2>

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          <td class="memname">void* grpc_metadata_credentials_plugin::state</td>
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<p>State that will be set as the first parameter of the methods above. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a6c02843e7eff42cb3b397800bd64f2dc">&#9670;&nbsp;</a></span>type</h2>

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          <td class="memname">const char* grpc_metadata_credentials_plugin::type</td>
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<p>Type of credentials that this plugin is implementing. </p>

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<hr/>The documentation for this struct was generated from the following file:<ul>
<li>include/grpc/<a class="el" href="grpc__security_8h_source.html">grpc_security.h</a></li>
</ul>
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