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(PHP Extension) Subscribe to Multiple Bitfinex Tickers on One ConnectionSubscribes to multiple ticker symbols on the public Bitfinex websocket ticker channel and receives ticker updates.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $ws = new CkWebSocket(); // For brevity, this example does not check for errors when etablishing the WebSocket connection. // See Establish WebSocket Connection for more complete sample code for making the connection. $rest = new CkRest(); // Connect to api.bitfinex.com $success = $rest->Connect('api.bitfinex.com',443,true,false); $ws->UseConnection($rest); $ws->AddClientHeaders(); $responseBody = $rest->fullRequestNoBody('GET','/ws'); $success = $ws->ValidateServerHandshake(); if ($success != true) { print $ws->lastErrorText() . "\n"; print $responseBody . "\n"; print $rest->responseHeader() . "\n"; exit; } // After connecting, the bitfinex websocket server will send // an info message that contains the actual version of the websocket stream. // Receive that message.. $success = $ws->ReadFrame(); if ($success != true) { print 'Failed to receive a frame' . "\n"; print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n"; print $ws->lastErrorText() . "\n"; exit; } // We should get this: // {"event":"info","version":1.1,"platform":{"status":1}} print $ws->getFrameData() . "\n"; // Subscribe to the BTCUSD ticker feed. // See https://docs.bitfinex.com/docs for more information. $json1 = new CkJsonObject(); $json1->AppendString('event','subscribe'); $json1->AppendString('channel','ticker'); $json1->AppendString('pair','BTCUSD'); $finalFrame = true; $success = $ws->SendFrame($json1->emit(),$finalFrame); // Subscribe to the ETHUSD ticker feed. $json2 = new CkJsonObject(); $json2->AppendString('event','subscribe'); $json2->AppendString('channel','ticker'); $json2->AppendString('pair','ETHUSD'); $success = $ws->SendFrame($json2->emit(),$finalFrame); // Begin reading the ticker feed. // / This will include a single confirmation response for each subscription. // We'll just read the 1st 5 updates and then exit.. $receivedFinalFrame = false; $numUpdatesReceived = 0; while ($numUpdatesReceived < 7) { $success = $ws->ReadFrame(); if ($success != true) { print 'Failed to receive a frame' . "\n"; print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n"; print $ws->lastErrorText() . "\n"; exit; } // The responses we desire are in Text frames, where the opcode = 1. if ($ws->get_FrameOpcodeInt() == 1) { $receivedText = $ws->getFrameData(); print $receivedText . "\n"; // Should receive a line of text such as this: // [2751,7349,36.34269559,7349.1,41.01777063,-116.2,-0.0156,7349.1,22188.26055319,7560,7270.5] // Initially, a single confirmation response for each subscription would be received, such as this: // {"event":"subscribed","channel":"ticker","chanId":810,"pair":"BTCUSD"} $numUpdatesReceived = $numUpdatesReceived + 1; } } // This is sample output: // You can see that the 1st message received is the subscription confirmation for the BTCUSD subscribe request. // The next message is a BTCUSD ticker update. // The next message is the confirmation for the ETHUSD subscription. // The next message is an ETHUSD update. // The BTCUSD channel ID is "537", and the ETHUSD channel ID is "700". The channel IDs are provided in the // subscription confirmation messages. Each ticker update begins with the channel ID.. // {"event":"subscribed","channel":"ticker","chanId":537,"pair":"BTCUSD"} // [537,6457.9,79.59102302,6458,22.49395741,-24.1,-0.0037,6457.9,13644.52820029,6540,6370.76958739] // {"event":"subscribed","channel":"ticker","chanId":700,"pair":"ETHUSD"} // [700,496.9,247.24493326,496.92,284.09636979,-2.47,-0.0049,496.9,74154.05945261,502.85,486.96] // [537,"hb"] // [700,"hb"] // [700,496.92,233.34338276,496.93,431.78867277,-2.45,-0.0049,496.92,74167.99173586,502.85,486.96] // Close the websocket connection. $success = $ws->SendClose(true,1000,'Closing this websocket.'); if ($success != true) { print $ws->lastErrorText() . "\n"; exit; } // Read the Close response. $success = $ws->ReadFrame(); if ($success != true) { print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n"; print $ws->lastErrorText() . "\n"; exit; } print 'Success.' . "\n"; ?> |
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