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	<h1 class="page-title">Class: Client</h1>
<section>

<header>
    
        <h2>
            <span class="ancestors"><a href="grpc.html">grpc</a>.</span>
        
        Client
        </h2>
        
    
</header>


<article>
    <div class="container-overview">
    
        
<hr>
<dt>
    <h4 class="name" id="Client"><span class="type-signature"></span>new Client(address, credentials, options)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>A generic gRPC client. Primarily useful as a base class for generated clients</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>address</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
            <td class="description last"><p>Server address to connect to</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>credentials</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.credentials-ChannelCredentials.html">grpc.credentials~ChannelCredentials</a></span>


            </td>

            
            <td class="description last"><p>Credentials to use to connect to
    the server</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>options</code></td>
            

            <td class="type">
            
                
<span class="param-type">Object</span>


            </td>

            
            <td class="description last"><p>Options to apply to channel creation</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

    
    </div>

    
        <h3 class="subsection-title">Methods</h3>

        <dl>
            
<hr>
<dt>
    <h4 class="name" id="close"><span class="type-signature"></span>close()</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Close this client.</p>
    </div>
    

<dl class="details">
    

</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="getChannel"><span class="type-signature"></span>getChannel()</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Return the underlying channel object for the specified client</p>
    </div>
    

<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>The channel</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type">Channel</span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="makeBidiStreamRequest"><span class="type-signature"></span>makeBidiStreamRequest(method, serialize, deserialize [, metadata] [, options])</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Make a bidirectional stream request with this method on the given channel.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>method</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The name of the method to request</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>serialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~serialize">grpc~serialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The serialization function for inputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>deserialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~deserialize">grpc~deserialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The deserialization
    function for outputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>metadata</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Metadata.html">grpc.Metadata</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Array of metadata key/value
    pairs to add to the call</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>options</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Client.html#~CallOptions">grpc.Client~CallOptions</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Options map</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>An event emitter for stream related events</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc-ClientDuplexStream.html">grpc~ClientDuplexStream</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="makeClientStreamRequest"><span class="type-signature"></span>makeClientStreamRequest(method, serialize, deserialize [, metadata] [, options], callback)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Make a client stream request to the given method, using the given serialize
and deserialize functions, with the given argument.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>method</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The name of the method to request</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>serialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~serialize">grpc~serialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The serialization function for
    inputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>deserialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~deserialize">grpc~deserialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The deserialization
    function for outputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>metadata</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Metadata.html">grpc.Metadata</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Array of metadata key/value pairs to add to
    the call</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>options</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Client.html#~CallOptions">grpc.Client~CallOptions</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Options map</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>callback</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Client.html#~requestCallback">grpc.Client~requestCallback</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The callback to for when the
    response is received</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>An event emitter for stream related
    events</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc-ClientWritableStream.html">grpc~ClientWritableStream</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="makeServerStreamRequest"><span class="type-signature"></span>makeServerStreamRequest(method, serialize, deserialize, argument [, metadata] [, options])</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Make a server stream request to the given method, with the given serialize
and deserialize function, using the given argument</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>method</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The name of the method to request</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>serialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~serialize">grpc~serialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The serialization function for inputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>deserialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~deserialize">grpc~deserialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The deserialization
    function for outputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>argument</code></td>
            

            <td class="type">
            
                
<span class="param-type">*</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The argument to the call. Should be serializable with
    serialize</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>metadata</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Metadata.html">grpc.Metadata</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Array of metadata key/value pairs to add to
    the call</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>options</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Client.html#~CallOptions">grpc.Client~CallOptions</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Options map</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>An event emitter for stream related
    events</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc-ClientReadableStream.html">grpc~ClientReadableStream</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="makeUnaryRequest"><span class="type-signature"></span>makeUnaryRequest(method, serialize, deserialize, argument [, metadata] [, options], callback)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Make a unary request to the given method, using the given serialize
and deserialize functions, with the given argument.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>method</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The name of the method to request</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>serialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~serialize">grpc~serialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The serialization function for
    inputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>deserialize</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~deserialize">grpc~deserialize</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The deserialization
    function for outputs</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>argument</code></td>
            

            <td class="type">
            
                
<span class="param-type">*</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The argument to the call. Should be serializable with
    serialize</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>metadata</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Metadata.html">grpc.Metadata</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Metadata to add to the call</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>options</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Client.html#~CallOptions">grpc.Client~CallOptions</a></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Options map</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>callback</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Client.html#~requestCallback">grpc.Client~requestCallback</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The callback to
    for when the response is received</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>An event emitter for stream related events</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc-ClientUnaryCall.html">grpc~ClientUnaryCall</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="waitForReady"><span class="type-signature"></span>waitForReady(deadline, callback)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Wait for the client to be ready. The callback will be called when the
client has successfully connected to the server, and it will be called
with an error if the attempt to connect to the server has unrecoverablly
failed or if the deadline expires. This function will make the channel
start connecting if it has not already done so.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>deadline</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~Deadline">grpc~Deadline</a></span>


            </td>

            
            <td class="description last"><p>When to stop waiting for a connection.</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>callback</code></td>
            

            <td class="type">
            
                
<span class="param-type">function</span>


            </td>

            
            <td class="description last"><p>The callback to call when done attempting
    to connect.</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

        </dl>
    

        <h3 class="subsection-title">Type Definitions</h3>

        <dl>
                
<hr>
<dt class="name" id="~Call">
    <h4 id="~Call">Call</h4>

    
</dt>
<dd>
    
    <div class="description">
        <p>Any client call type</p>
    </div>
    

        <h5>Type:</h5>
        <ul>
            <li>
                
<span class="param-type"><a href="grpc-ClientUnaryCall.html">grpc~ClientUnaryCall</a></span>
|

<span class="param-type"><a href="grpc-ClientReadableStream.html">grpc~ClientReadableStream</a></span>
|

<span class="param-type"><a href="grpc-ClientWritableStream.html">grpc~ClientWritableStream</a></span>
|

<span class="param-type"><a href="grpc-ClientDuplexStream.html">grpc~ClientDuplexStream</a></span>


            </li>
        </ul>
    

<dl class="details">
    

</dl>


</dd>

            
<hr>
<dt class="name" id="~CallOptions">
    <h4 id="~CallOptions">CallOptions</h4>

    
</dt>
<dd>
    
    <div class="description">
        <p>Options that can be set on a call.</p>
    </div>
    

        <h5>Type:</h5>
        <ul>
            <li>
                
<span class="param-type">Object</span>


            </li>
        </ul>
    

<dl class="details">
    

    <h5 class="subsection-title">Properties:</h5>

    <dl>

<table class="props table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>deadline</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~Deadline">grpc~Deadline</a></span>


            </td>

            
            <td class="description last"><p>The deadline for the entire call to
    complete.</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>host</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
            <td class="description last"><p>Server hostname to set on the call. Only meaningful
    if different from the server address used to construct the client.</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>parent</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Client.html#~Call">grpc.Client~Call</a></span>


            </td>

            
            <td class="description last"><p>Parent call. Used in servers when
    making a call as part of the process of handling a call. Used to
    propagate some information automatically, as specified by
    propagate_flags.</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>propagate_flags</code></td>
            

            <td class="type">
            
                
<span class="param-type">number</span>


            </td>

            
            <td class="description last"><p>Indicates which properties of a parent
    call should propagate to this call. Bitwise combination of flags in
    <a href="grpc.html#.propagate">grpc.propagate</a>.</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>credentials</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.credentials-CallCredentials.html">grpc.credentials~CallCredentials</a></span>


            </td>

            
            <td class="description last"><p>The credentials that
    should be used to make this particular call.</p></td>
        </tr>

    
    </tbody>
</table>
</dl>

    
</dl>


</dd>

            
<hr>
<dt>
    <h4 class="name" id="~requestCallback"><span class="type-signature"></span>requestCallback(error, value)</h4>
    
    
</dt>
<dd>

    
        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>error</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~ServiceError">grpc~ServiceError</a></span>


            </td>

            
                <td class="attributes">
                

                    &lt;nullable><br>
                

                </td>
            

            <td class="description last"><p>The error, if the call
    failed</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>value</code></td>
            

            <td class="type">
            
                
<span class="param-type">*</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The response value, if the call succeeded</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

            </dl>
    

</article>

</section>


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