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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.ExtensionScalar.html">pyarrow.ExtensionScalar</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.Tensor.html">pyarrow.Tensor</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2 has-children"><a class="reference internal" href="api/compute.html">Compute Functions</a><input class="toctree-checkbox" id="toctree-checkbox-7" name="toctree-checkbox-7" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-7"><i class="fa-solid fa-chevron-down"></i></label><ul> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.negate_checked.html">pyarrow.compute.negate_checked</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.sqrt.html">pyarrow.compute.sqrt</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.sqrt_checked.html">pyarrow.compute.sqrt_checked</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.subtract_checked.html">pyarrow.compute.subtract_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.bit_wise_and.html">pyarrow.compute.bit_wise_and</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.bit_wise_not.html">pyarrow.compute.bit_wise_not</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.bit_wise_or.html">pyarrow.compute.bit_wise_or</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.bit_wise_xor.html">pyarrow.compute.bit_wise_xor</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.shift_left_checked.html">pyarrow.compute.shift_left_checked</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.shift_right_checked.html">pyarrow.compute.shift_right_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.ceil.html">pyarrow.compute.ceil</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.floor.html">pyarrow.compute.floor</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.round.html">pyarrow.compute.round</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.round_to_multiple.html">pyarrow.compute.round_to_multiple</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.trunc.html">pyarrow.compute.trunc</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.ln.html">pyarrow.compute.ln</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.ln_checked.html">pyarrow.compute.ln_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.log10.html">pyarrow.compute.log10</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.log10_checked.html">pyarrow.compute.log10_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.log1p.html">pyarrow.compute.log1p</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.log1p_checked.html">pyarrow.compute.log1p_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.log2.html">pyarrow.compute.log2</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.log2_checked.html">pyarrow.compute.log2_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.logb.html">pyarrow.compute.logb</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.logb_checked.html">pyarrow.compute.logb_checked</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.acos_checked.html">pyarrow.compute.acos_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.asin.html">pyarrow.compute.asin</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.asin_checked.html">pyarrow.compute.asin_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.atan.html">pyarrow.compute.atan</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.atan2.html">pyarrow.compute.atan2</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.cos.html">pyarrow.compute.cos</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.cos_checked.html">pyarrow.compute.cos_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.sin.html">pyarrow.compute.sin</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.sin_checked.html">pyarrow.compute.sin_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.tan.html">pyarrow.compute.tan</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.tan_checked.html">pyarrow.compute.tan_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.compute.equal.html">pyarrow.compute.equal</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.ipc.MessageReader.html">pyarrow.ipc.MessageReader</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.flight.FlightUnavailableError.html">pyarrow.flight.FlightUnavailableError</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="generated/pyarrow.flight.FlightWriteSizeExceededError.html">pyarrow.flight.FlightWriteSizeExceededError</a></li> |
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| <section id="arrow-flight-rpc"> |
| <h1>Arrow Flight RPC<a class="headerlink" href="#arrow-flight-rpc" title="Permalink to this heading">#</a></h1> |
| <p>Arrow Flight is an RPC framework for efficient transfer of Flight data |
| over the network.</p> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <dl class="simple"> |
| <dt><a class="reference internal" href="../format/Flight.html"><span class="doc">Flight protocol documentation</span></a></dt><dd><p>Documentation of the Flight protocol, including how to use |
| Flight conceptually.</p> |
| </dd> |
| <dt><a class="reference internal" href="api/flight.html"><span class="doc">Flight API documentation</span></a></dt><dd><p>Python API documentation listing all of the various client and |
| server classes.</p> |
| </dd> |
| <dt><a class="reference external" href="https://arrow.apache.org/cookbook/py/flight.html">Python Cookbook</a></dt><dd><p>Recipes for using Arrow Flight in Python.</p> |
| </dd> |
| </dl> |
| </div> |
| <section id="writing-a-flight-service"> |
| <h2>Writing a Flight Service<a class="headerlink" href="#writing-a-flight-service" title="Permalink to this heading">#</a></h2> |
| <p>Servers are subclasses of <a class="reference internal" href="generated/pyarrow.flight.FlightServerBase.html#pyarrow.flight.FlightServerBase" title="pyarrow.flight.FlightServerBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">FlightServerBase</span></code></a>. To implement |
| individual RPCs, override the RPC methods on this class.</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">pyarrow.flight</span> <span class="k">as</span> <span class="nn">flight</span> |
| |
| <span class="k">class</span> <span class="nc">MyFlightServer</span><span class="p">(</span><span class="n">flight</span><span class="o">.</span><span class="n">FlightServerBase</span><span class="p">):</span> |
| <span class="k">def</span> <span class="nf">list_flights</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</span><span class="p">,</span> <span class="n">criteria</span><span class="p">):</span> |
| <span class="n">info</span> <span class="o">=</span> <span class="n">flight</span><span class="o">.</span><span class="n">FlightInfo</span><span class="p">(</span><span class="o">...</span><span class="p">)</span> |
| <span class="k">yield</span> <span class="n">info</span> |
| </pre></div> |
| </div> |
| <p>Each RPC method always takes a <a class="reference internal" href="generated/pyarrow.flight.ServerCallContext.html#pyarrow.flight.ServerCallContext" title="pyarrow.flight.ServerCallContext"><code class="xref py py-class docutils literal notranslate"><span class="pre">ServerCallContext</span></code></a> for common |
| parameters. To indicate failure, raise an exception; Flight-specific |
| errors can be indicated by raising one of the subclasses of |
| <a class="reference internal" href="generated/pyarrow.flight.FlightError.html#pyarrow.flight.FlightError" title="pyarrow.flight.FlightError"><code class="xref py py-class docutils literal notranslate"><span class="pre">FlightError</span></code></a>.</p> |
| <p>To start a server, create a <a class="reference internal" href="generated/pyarrow.flight.Location.html#pyarrow.flight.Location" title="pyarrow.flight.Location"><code class="xref py py-class docutils literal notranslate"><span class="pre">Location</span></code></a> to specify where to |
| listen, and create an instance of the server. (A string will be |
| converted into a location.) This will start the server, but won’t |
| block the rest of the program. Call <a class="reference internal" href="generated/pyarrow.flight.FlightServerBase.html#pyarrow.flight.FlightServerBase.serve" title="pyarrow.flight.FlightServerBase.serve"><code class="xref py py-meth docutils literal notranslate"><span class="pre">FlightServerBase.serve()</span></code></a> to |
| block until the server stops.</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Listen to all interfaces on a free port</span> |
| <span class="n">server</span> <span class="o">=</span> <span class="n">MyFlightServer</span><span class="p">(</span><span class="s2">"grpc://0.0.0.0:0"</span><span class="p">)</span> |
| |
| <span class="nb">print</span><span class="p">(</span><span class="s2">"Server listening on port"</span><span class="p">,</span> <span class="n">server</span><span class="o">.</span><span class="n">port</span><span class="p">)</span> |
| <span class="n">server</span><span class="o">.</span><span class="n">serve</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="using-the-flight-client"> |
| <h2>Using the Flight Client<a class="headerlink" href="#using-the-flight-client" title="Permalink to this heading">#</a></h2> |
| <p>To connect to a Flight service, call <a class="reference internal" href="generated/pyarrow.flight.connect.html#pyarrow.flight.connect" title="pyarrow.flight.connect"><code class="xref py py-meth docutils literal notranslate"><span class="pre">pyarrow.flight.connect()</span></code></a> |
| with a location.</p> |
| </section> |
| <section id="cancellation-and-timeouts"> |
| <h2>Cancellation and Timeouts<a class="headerlink" href="#cancellation-and-timeouts" title="Permalink to this heading">#</a></h2> |
| <p>When making a call, clients can optionally provide |
| <a class="reference internal" href="generated/pyarrow.flight.FlightCallOptions.html#pyarrow.flight.FlightCallOptions" title="pyarrow.flight.FlightCallOptions"><code class="xref py py-class docutils literal notranslate"><span class="pre">FlightCallOptions</span></code></a>. This allows clients to set a timeout on |
| calls or provide custom HTTP headers, among other features. Also, some |
| objects returned by client RPC calls expose a <code class="docutils literal notranslate"><span class="pre">cancel</span></code> method which |
| allows terminating a call early.</p> |
| <p>On the server side, timeouts are transparent. For cancellation, the |
| server needs to manually poll <a class="reference internal" href="generated/pyarrow.flight.ServerCallContext.html#pyarrow.flight.ServerCallContext.is_cancelled" title="pyarrow.flight.ServerCallContext.is_cancelled"><code class="xref py py-meth docutils literal notranslate"><span class="pre">ServerCallContext.is_cancelled()</span></code></a> |
| to check if the client has cancelled the call, and if so, break out of |
| any processing the server is currently doing.</p> |
| </section> |
| <section id="enabling-tls"> |
| <h2>Enabling TLS<a class="headerlink" href="#enabling-tls" title="Permalink to this heading">#</a></h2> |
| <p>TLS can be enabled when setting up a server by providing a certificate |
| and key pair to <a class="reference internal" href="generated/pyarrow.flight.FlightServerBase.html#pyarrow.flight.FlightServerBase" title="pyarrow.flight.FlightServerBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">FlightServerBase</span></code></a>.</p> |
| <p>On the client side, use <a class="reference internal" href="generated/pyarrow.flight.Location.html#pyarrow.flight.Location.for_grpc_tls" title="pyarrow.flight.Location.for_grpc_tls"><code class="xref py py-func docutils literal notranslate"><span class="pre">Location.for_grpc_tls()</span></code></a> to construct the |
| <a class="reference internal" href="generated/pyarrow.flight.Location.html#pyarrow.flight.Location" title="pyarrow.flight.Location"><code class="xref py py-class docutils literal notranslate"><span class="pre">Location</span></code></a> to listen on.</p> |
| </section> |
| <section id="enabling-authentication"> |
| <h2>Enabling Authentication<a class="headerlink" href="#enabling-authentication" title="Permalink to this heading">#</a></h2> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>Authentication is insecure without enabling TLS.</p> |
| </div> |
| <p>Handshake-based authentication can be enabled by implementing |
| <a class="reference internal" href="generated/pyarrow.flight.ServerAuthHandler.html#pyarrow.flight.ServerAuthHandler" title="pyarrow.flight.ServerAuthHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">ServerAuthHandler</span></code></a>. Authentication consists of two parts: on |
| initial client connection, the server and client authentication |
| implementations can perform any negotiation needed; then, on each RPC |
| thereafter, the client provides a token. The server authentication |
| handler validates the token and provides the identity of the |
| client. This identity can be obtained from the |
| <a class="reference internal" href="generated/pyarrow.flight.ServerCallContext.html#pyarrow.flight.ServerCallContext" title="pyarrow.flight.ServerCallContext"><code class="xref py py-class docutils literal notranslate"><span class="pre">ServerCallContext</span></code></a>.</p> |
| </section> |
| <section id="custom-middleware"> |
| <h2>Custom Middleware<a class="headerlink" href="#custom-middleware" title="Permalink to this heading">#</a></h2> |
| <p>Servers and clients support custom middleware (or interceptors) that |
| are called on every request and can modify the request in a limited |
| fashion. These can be implemented by subclassing |
| <a class="reference internal" href="generated/pyarrow.flight.ServerMiddleware.html#pyarrow.flight.ServerMiddleware" title="pyarrow.flight.ServerMiddleware"><code class="xref py py-class docutils literal notranslate"><span class="pre">ServerMiddleware</span></code></a> and <a class="reference internal" href="generated/pyarrow.flight.ClientMiddleware.html#pyarrow.flight.ClientMiddleware" title="pyarrow.flight.ClientMiddleware"><code class="xref py py-class docutils literal notranslate"><span class="pre">ClientMiddleware</span></code></a>, then |
| providing them when creating the client or server.</p> |
| <p>Middleware are fairly limited, but they can add headers to a |
| request/response. On the server, they can inspect incoming headers and |
| fail the request; hence, they can be used to implement custom |
| authentication methods.</p> |
| </section> |
| <section id="flight-best-practices"> |
| <h2><a class="reference internal" href="../cpp/flight.html#flight-best-practices"><span class="std std-ref">Flight best practices</span></a><a class="headerlink" href="#flight-best-practices" title="Permalink to this heading">#</a></h2> |
| </section> |
| </section> |
| |
| |
| </article> |
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| <li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#writing-a-flight-service">Writing a Flight Service</a></li> |
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