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- <?xml version="1.0" encoding="UTF-8"?>
- <diagram author="Yentl Van Tendeloo" name="HTTP client">
- <description>
- HTTP client.
- </description>
- <top>
- import uuid
- </top>
- <inport name="socket_in"/>
- <outport name="socket_out"/>
- <inport name="request_in"/>
- <outport name="request_out"/>
- <class name="HTTPClient">
- <constructor>
- <body>
- <![CDATA[
- self.socket = None
- self.received_data = ""
- self.send_data = ""
- self.queue = []
- self.IDs = []
- ]]>
- </body>
- </constructor>
- <scxml initial="init">
- <state id="init">
- <onentry>
- <script>
- self.ID = str(uuid.uuid4())
- </script>
- <raise scope="output" event="create_socket" port="socket_out">
- <parameter expr="self.ID"/>
- </raise>
- </onentry>
- <transition port="socket_in" event="created_socket" cond="self.ID == ID" target="../waiting">
- <parameter name="socket"/>
- <parameter name="ID"/>
- <script>
- self.socket = socket
- </script>
- </transition>
- </state>
- <state id="waiting">
- <onentry>
- <raise scope="output" port="request_out" event="http_client_initialized"/>
- </onentry>
- <transition port="request_in" event="connect" target="../connecting">
- <parameter name="address"/>
- <parameter name="timeout"/>
- <script>
- self.address = address
- self.timeout = timeout
- </script>
- </transition>
- </state>
- <state id="connecting" initial="connecting">
- <state id="connecting">
- <onentry>
- <raise scope="output" event="connect_socket" port="socket_out">
- <parameter expr="self.socket"/>
- <parameter expr="self.address"/>
- </raise>
- </onentry>
- <transition port="socket_in" event="error_socket" target="../cooldown"/>
- <transition port="socket_in" event="connected_socket" cond="self.socket == socket" target="../../connected">
- <parameter name="socket"/>
- <raise scope="output" port="request_out" event="http_client_ready"/>
- </transition>
- </state>
- <state id="cooldown">
- <transition after="0.1" target="../connecting"/>
- </state>
- <transition after="self.timeout" target="../waiting">
- <raise scope="output" port="request_out" event="http_client_timeout"/>
- </transition>
- </state>
- <parallel id="connected">
- <state id="listening" initial="listen">
- <state id="listen">
- <onentry>
- <raise scope="output" port="socket_out" event="recv_socket">
- <parameter expr="self.socket"/>
- </raise>
- </onentry>
- <transition event="received_socket" port="socket_in" cond="(self.socket == socket) and (len(data) > 0)" target=".">
- <parameter name="socket"/>
- <parameter name="data"/>
- <script>
- self.received_data += data
- </script>
- </transition>
- <transition event="received_socket" port="socket_in" cond="(self.socket == socket) and (len(data) == 0)" target="../close">
- <parameter name="socket"/>
- <parameter name="data"/>
- </transition>
- </state>
- <state id="close">
- </state>
- </state>
- <state id="sending" initial="waiting_for_data">
- <state id="waiting_for_data">
- <transition cond="len(self.send_data) > 0" target="../transferring">
- <raise scope="output" port="socket_out" event="send_socket">
- <parameter expr="self.socket"/>
- <parameter expr="self.send_data"/>
- </raise>
- </transition>
- </state>
- <state id="transferring">
- <transition event="sent_socket" port="socket_in" cond="self.socket == socket" target="../waiting_for_data">
- <parameter name="socket"/>
- <parameter name="sent_bytes"/>
- <script>
- self.send_data = self.send_data[sent_bytes:]
- </script>
- </transition>
- </state>
- </state>
- <state id="queueing">
- <state id="queueing">
- <onentry>
- </onentry>
- <transition port="request_in" event="HTTP_input" target=".">
- <parameter name="data"/>
- <parameter name="ID"/>
- <script>
- self.send_data += "POST / HTTP/1.0\r\n"
- self.send_data += "Content-Length: %i\r\n" % len(str(data))
- self.send_data += "\r\n"
- self.send_data += data
- self.IDs.append(ID)
- </script>
- </transition>
- </state>
- </state>
- <state id="parsing" initial="wait_for_header">
- <state id="wait_for_header">
- <transition cond="'\r\n\r\n' in self.received_data" target="../wait_for_payload">
- <script>
- header, self.received_data = self.received_data.split("\r\n\r\n", 1)
- header = header.lower()
- if "content-length" in header:
- _, after = header.split("content-length:", 1)
- after, _ = after.split("\r\n", 1)
- after = after.strip()
- self.length = int(after)
- else:
- self.length = float('inf')
- </script>
- </transition>
- </state>
- <state id="wait_for_payload">
- <transition cond="len(self.received_data) >= self.length and self.IDs[0] is not None" target="../wait_for_header">
- <script>
- data = self.received_data[:self.length]
- self.received_data = self.received_data[self.length:]
- </script>
- <raise event="HTTP_output" scope="output" port="request_out">
- <parameter expr="data"/>
- <parameter expr="self.IDs.pop(0)"/>
- </raise>
- </transition>
- <transition cond="len(self.received_data) >= self.length and self.IDs[0] is None" target="../wait_for_header">
- <script>
- # Drop data
- self.received_data = self.received_data[self.length:]
- self.IDs.pop(0)
- </script>
- </transition>
- </state>
- </state>
- </parallel>
- </scxml>
- </class>
- </diagram>
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