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annotate memory_profiler_server.js @ 77:8cf72992387d default tip

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add JSONP
author Dion Almaer <dion@mozilla.com>
date Fri, 26 Jun 2009 10:13:32 -0700
parents b87b6ebb6e86
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
73
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1 // This function is called by the platform whenever an uncaught exception
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2 // occurs.
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3
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4 function handleError() {
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5 printTraceback(lastExceptionTraceback);
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6 print(lastException);
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7 }
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8
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9 // This function uses the Python-inspired traceback functionality of the
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10 // playground to print a stack trace that looks much like Python's.
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11
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12 function printTraceback(frame) {
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13 print("Traceback (most recent call last):");
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14 if (frame === undefined)
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15 frame = stack();
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16 var lines = [];
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17 while (frame) {
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18 var line = (' File "' + frame.filename + '", line ' +
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19 frame.lineNo + ', in ' + frame.functionName);
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20 lines.splice(0, 0, line);
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21 frame = frame.caller;
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22 }
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23 print(lines.join('\n'));
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24 }
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25
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26 function debug(out) {
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27 print("DEBUG: " + out);
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28 }
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29
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30 // Work out if the caller wants the output to be wrapped in a JSONP function wrapper
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31 function wrapJSONP(path, json) {
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32 var callbackName = path.match(/callback=(\w+)/);
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33 if (callbackName) {
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34 return callbackName[1] + "(" + json + ")";
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35 } else {
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36 return json;
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37 }
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38 }
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39
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40 // This is just a test to exercise the code a bit.
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41 JSON.stringify(getObjectInfo(getGCRoots()[0]));
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42
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43 var socket = new ServerSocket();
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44
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45 var IP = "127.0.0.1";
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46 var PORT = 8080;
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47 var BASE_URL = "http://" + IP + ":" + PORT;
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48 var HELP = [
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49 "REST API methods available:",
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50 "",
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51 " /gc-roots JSON array of GC root object IDs.",
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52 " /objects/{ID} JSON metadata about the given object ID.",
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53 " /stop Stops the server."];
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54
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55 HELP = HELP.join("\r\n");
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56
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57 socket.bind(IP, PORT);
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58 socket.listen();
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59
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60 var NEWLINE = "\r\n";
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61 var DOUBLE_NEWLINE = NEWLINE + NEWLINE;
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62
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63 function getHeaders(conn) {
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64 var headers = "";
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65 while (1) {
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66 var character = conn.recv(1);
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67 if (character == null)
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68 return null;
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69 headers += character;
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70 if (headers.indexOf(DOUBLE_NEWLINE) != -1)
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71 return headers;
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72 }
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73 }
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74
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75 print("Waiting for requests at " + BASE_URL + ".\n");
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76 print(HELP);
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77
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78 function processRequest(socket) {
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79 var conn = socket.accept();
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80
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81 try {
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82 var requestHeaders = getHeaders(conn);
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83 if (requestHeaders == null)
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84 return true;
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85 var requestLines = requestHeaders.split("\r\n");
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86 debug("Request: " + requestLines[0]);
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87 var reqParts = requestLines[0].split(" ");
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88 var method = reqParts[0];
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89 var path = reqParts[1];
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90 debug("Path: " + path);
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91
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92 var code = "200 OK";
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93 var toSend;
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94
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95 // TODO: We'd like to set the MIME type of JSON data to application/json,
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96 // but Firefox doesn't let us browse a webserver this way, which is
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97 // annoying, so we're just leaving it at text/plain for now.
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98
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99 if (path == "/") {
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100 toSend = HELP;
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101 } else if (path.indexOf("/stop") == 0) {
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102 toSend = "Stopping server now!";
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103 } else {
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104 if (path.indexOf("/gc-roots") == 0) {
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105 toSend = JSON.stringify(getGCRoots());
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106 } else {
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107 var objNum = path.match(/^\/objects\/(\d+)/);
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108 if (objNum) {
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109 //throw new Error('wut');
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110 objNum = objNum[1];
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111 debug(objNum);
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112 var objInfo = getObjectInfo(objNum);
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113 if (objInfo) {
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114 toSend = JSON.stringify(objInfo);
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115 } else {
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116 code = "404 Not Found";
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117 toSend = "Object " + objNum + " does not exist.";
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118 }
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119 }
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120 }
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121 }
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122
52
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123 if (!toSend) {
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124 code = "404 Not Found";
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125 toSend = "Not found, yo.";
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126 }
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127
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128 // maybe wrap the response in JSONP
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129 toSend = wrapJSONP(path, toSend);
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130 debug("toSend == " + toSend);
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131
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132 //print("headers: " + uneval(requestHeaders));
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133 var headerLines = ["HTTP/1.0 " + code,
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134 "Content-Type: text/plain",
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135 "Connection: close",
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136 "Content-Length: " + toSend.length];
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137 var headers = headerLines.join("\r\n");
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138 var response = headers + DOUBLE_NEWLINE + toSend;
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139 //print("response: " + uneval(response));
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140 conn.send(response);
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141 conn.close();
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142 //print("response sent.");
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143 } catch (e) {
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144 handleError();
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145 try { conn.close(); } catch (e) {}
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146 }
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147 if (path == "/stop")
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148 return false;
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149 return true;
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150 }
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151
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152 var keepGoing = true;
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153
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154 while (keepGoing) {
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155 try {
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156 keepGoing = processRequest(socket);
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157 } catch (e) {
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158 handleError();
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159 }
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160 }
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161
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162 socket.close();