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monkeypatch socket.io to fix frame handler in v0.9.16
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2 changed files with 46 additions and 0 deletions
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@ -23,6 +23,9 @@ CookieParser = require("cookie-parser")
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DrainManager = require("./app/js/DrainManager")
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HealthCheckManager = require("./app/js/HealthCheckManager")
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# work around frame handler bug in socket.io v0.9.16
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require("./socket.io.patch.js")
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# Set up socket.io server
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app = express()
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Metrics.injectMetricsRoute(app)
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43
services/real-time/socket.io.patch.js
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43
services/real-time/socket.io.patch.js
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@ -0,0 +1,43 @@
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var io = require("socket.io");
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if (io.version === "0.9.16") {
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console.log("patching socket.io hybi-16 transport frame prototype");
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var transports = require("socket.io/lib/transports/websocket/hybi-16.js");
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transports.prototype.frame = patchedFrameHandler;
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// file hybi-07-12 has the same problem but no browsers are using that protocol now
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}
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function patchedFrameHandler(opcode, str) {
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var dataBuffer = new Buffer(str),
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dataLength = dataBuffer.length,
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startOffset = 2,
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secondByte = dataLength;
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if (dataLength === 65536) {
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console.log("fixing invalid frame length in socket.io");
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}
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if (dataLength > 65535) {
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// original code had > 65536
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startOffset = 10;
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secondByte = 127;
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} else if (dataLength > 125) {
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startOffset = 4;
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secondByte = 126;
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}
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var outputBuffer = new Buffer(dataLength + startOffset);
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outputBuffer[0] = opcode;
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outputBuffer[1] = secondByte;
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dataBuffer.copy(outputBuffer, startOffset);
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switch (secondByte) {
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case 126:
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outputBuffer[2] = dataLength >>> 8;
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outputBuffer[3] = dataLength % 256;
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break;
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case 127:
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var l = dataLength;
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for (var i = 1; i <= 8; ++i) {
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outputBuffer[startOffset - i] = l & 0xff;
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l >>>= 8;
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}
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}
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return outputBuffer;
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}
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