| Wentao Shang | f8b4a7d | 2012-12-25 12:52:07 -0800 | [diff] [blame] | 1 | <?xml version = "1.0" encoding="utf-8" ?>
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| 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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| 3 | "DTD/xhtml1-strict.dtd">
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| 4 | <html xmlns = "http://www.w3.org/1999/xhtml">
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| 5 | <meta charset="UTF-8">
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| 6 |
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| 7 | <head>
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| 8 | <title>NDN Get File via WebSocket</title>
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| 9 |
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| 10 | <script type="text/javascript" src="../tools/build/ndn-js.js"></script>
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| 11 |
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| 12 | <script type="text/javascript">
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| 13 | hostip = "131.179.196.232";
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| 14 | //hostip = "localhost";
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| 15 | var ndncon = new NDN({port:9696,host:hostip});
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| 16 | ndncon.transport.connectWebSocket(ndncon);
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| 17 |
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| 18 | ///////////////////////////////////////////////////////////////////////////////////////////////////////////
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| 19 | /*
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| 20 | * Closure for calling expressInterest to fetch big file.
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| 21 | */
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| 22 | var ContentClosure = function ContentClosure(ndn, T0) {
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| 23 | // Inherit from Closure.
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| 24 | Closure.call(this);
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| 25 |
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| 26 | this.T0 = T0;
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| 27 | this.ndn = ndn;
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| 28 | this.totalBlocks = 0;
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| 29 |
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| 30 | this.firstReceivedSegmentNumber = null;
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| 31 | this.firstReceivedContentObject = null;
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| 32 | }
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| 33 |
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| 34 | ContentClosure.prototype.upcall = function(kind, upcallInfo) {
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| 35 | if (kind == Closure.UPCALL_INTEREST_TIMED_OUT) {
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| 36 | var T1 = new Date();
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| 37 | document.getElementById('content').innerHTML += "<p>Interest time out.</p>";
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| 38 | document.getElementById('content').innerHTML += "<p>Time elapsed: " + (T1 - this.T0) + " ms including 4s timeout</p>";
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| 39 | document.getElementById('content').innerHTML += "<p>Total number of blocks: " + this.totalBlocks + "</p>";
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| 40 | return Closure.RESULT_OK;
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| 41 | }
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| 42 |
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| 43 | if (!(kind == Closure.UPCALL_CONTENT ||
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| 44 | kind == Closure.UPCALL_CONTENT_UNVERIFIED))
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| 45 | // The upcall is not for us.
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| 46 | return Closure.RESULT_ERR;
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| 47 |
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| 48 | var contentObject = upcallInfo.contentObject;
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| 49 | if (contentObject.content == null) {
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| 50 | console.log("NdnProtocol.ContentClosure: contentObject.content is null\n");
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| 51 | return Closure.RESULT_ERR;
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| 52 | }
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| 53 |
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| 54 | // Use the segmentNumber to load multiple segments.
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| 55 | //var segmentNumber = ArrayToNum(contentObject.name.components[contentObject.name.components.length - 1]);
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| 56 | var segmentNumber = DataUtils.bigEndianToUnsignedInt
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| 57 | (contentObject.name.components[contentObject.name.components.length - 1]);
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| 58 | //console.log(segmentNumber);
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| 59 |
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| 60 | if (this.firstReceivedSegmentNumber == null) {
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| 61 | // This is the first call.
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| 62 | this.firstReceivedSegmentNumber = segmentNumber;
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| 63 | if (segmentNumber != 0) {
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| 64 | // Special case: Save this content object for later and request segment zero.
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| 65 | this.firstReceivedContentObject = contentObject;
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| 66 | var componentsForZero = contentObject.name.components.slice
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| 67 | (0, contentObject.name.components.length - 1);
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| 68 | componentsForZero.push([0]);
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| 69 | this.ndn.expressInterest(new Name(componentsForZero), this);
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| 70 | return Closure.RESULT_OK;
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| 71 | }
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| 72 | }
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| 73 |
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| 74 | // Process received data here...
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| 75 | // Count content length
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| 76 | //nameStr = escape(contentObject.name.getName());
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| 77 | //document.getElementById('content').innerHTML += "<p>Name string: " + nameStr + "</p>";
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| 78 | //document.getElementById('content').innerHTML += "<p>Content buffer length: " + contentObject.content.length + "</p>";
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| 79 | this.totalBlocks++;
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| 80 |
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| 81 | // Check for the special case if the saved content is for the next segment that we need.
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| 82 | if (this.firstReceivedContentObject != null &&
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| 83 | this.firstReceivedSegmentNumber == segmentNumber + 1) {
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| 84 | // Substitute the saved contentObject send its content and keep going.
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| 85 | contentObject = this.firstReceivedContentObject;
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| 86 | segmentNumber = segmentNumber + 1;
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| 87 | // Clear firstReceivedContentObject to save memory.
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| 88 | this.firstReceivedContentObject = null;
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| 89 |
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| 90 | // Process received data here...
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| 91 | // Count content length
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| 92 | //nameStr = escape(contentObject.name.getName());
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| 93 | //document.getElementById('content').innerHTML += "<p>Name string: " + nameStr + "</p>";
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| 94 | //document.getElementById('content').innerHTML += "<p>Content buffer length: " + contentObject.content.length + "</p>";
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| 95 | this.totalBlocks++;
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| 96 | }
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| 97 |
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| 98 | var finalSegmentNumber = null;
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| 99 | if (contentObject.signedInfo != null && contentObject.signedInfo.finalBlockID != null)
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| 100 | //finalSegmentNumber = ArrayToNum(contentObject.signedInfo.finalBlockID);
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| 101 | finalSegmentNumber = DataUtils.bigEndianToUnsignedInt(contentObject.signedInfo.finalBlockID);
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| 102 |
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| 103 | if (finalSegmentNumber == null || segmentNumber != finalSegmentNumber) {
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| 104 | // Make a name for the next segment and get it.
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| 105 | //var segmentNumberPlus1 = NumToArray(segmentNumber + 1);
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| 106 | // Make a name for the next segment and get it.
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| 107 | var segmentNumberPlus1 = DataUtils.nonNegativeIntToBigEndian(segmentNumber + 1);
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| 108 | // Put a 0 byte in front.
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| 109 | var nextSegmentNumber = new Uint8Array(segmentNumberPlus1.length + 1);
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| 110 | nextSegmentNumber.set(segmentNumberPlus1, 1);
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| 111 |
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| 112 | var components = contentObject.name.components.slice
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| 113 | (0, contentObject.name.components.length - 1);
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| 114 | components.push(nextSegmentNumber);
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| 115 | //components.push(segmentNumberPlus1);
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| 116 | this.ndn.expressInterest(new Name(components), this);
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| 117 | }
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| 118 | else {
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| 119 | // Final block received.
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| 120 | // Record stop time
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| 121 | var T1 = new Date();
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| 122 | document.getElementById('content').innerHTML += "<p>Final block received.</p>";
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| 123 | document.getElementById('content').innerHTML += "<p>Time elapsed: " + (T1 - this.T0) + " ms</p>";
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| 124 | document.getElementById('content').innerHTML += "<p>Total number of blocks: " + this.totalBlocks + "</p>";
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| 125 | }
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| 126 |
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| 127 | return Closure.RESULT_OK;
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| 128 | };
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| 129 |
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| 130 | /*
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| 131 | * Convert the big endian Uint8Array to an unsigned int.
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| 132 | * Don't check for overflow.
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| 133 | */
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| 134 | function ArrayToNum(bytes) {
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| 135 | var result = 0;
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| 136 | for (var i = 0; i < bytes.length; ++i) {
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| 137 | result = result * 10;
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| 138 | result += (bytes[i] - 48);
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| 139 | }
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| 140 | return result;
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| 141 | };
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| 142 |
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| 143 | /*
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| 144 | * Convert the int value to a new big endian Uint8Array and return.
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| 145 | * If value is 0 or negative, return Uint8Array(0).
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| 146 | */
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| 147 | function NumToArray(value) {
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| 148 | value = Math.round(value);
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| 149 | if (value <= 0)
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| 150 | return new Uint8Array(0);
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| 151 |
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| 152 | numString = value.toString();
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| 153 | var size = numString.length;
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| 154 | var result = new Uint8Array(size);
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| 155 | for (i = 0; i < size; i++) {
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| 156 | result[i] = numString.charCodeAt(i);
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| 157 | }
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| 158 | return result;
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| 159 | };
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| 160 | ///////////////////////////////////////////////////////////////////////////////////////////////////////////
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| 161 |
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| 162 | /*
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| 163 | var AsyncGetClosure = function AsyncGetClosure(T0) {
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| 164 | this.T0 = T0; // Start time
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| 165 | // Inherit from Closure.
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| 166 | Closure.call(this);
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| 167 | };
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| 168 |
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| 169 | AsyncGetClosure.prototype.upcall = function(kind, upcallInfo) {
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| 170 | //console.log("Closure.upcall() executed.");
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| 171 | if (kind == Closure.UPCALL_FINAL) {
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| 172 | // Do nothing.
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| 173 | } else if (kind == Closure.UPCALL_CONTENT) {
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| 174 | var T1 = new Date();
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| 175 |
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| 176 | var content = upcallInfo.contentObject;
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| 177 | nameStr = escape(content.name.getName());
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| 178 | document.getElementById('content').innerHTML += "<p>Time elapsed: " + (T1 - this.T0) + " ms</p>";
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| 179 | document.getElementById('content').innerHTML += "<p>Name string: " + nameStr + "</p>";
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| 180 | document.getElementById('content').innerHTML += "<p>Content buffer length: " + content.content.length + "</p>";
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| 181 | //console.log("In callback, nameStr: " + nameStr);
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| 182 | //console.log("In callback, content: ");
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| 183 | //console.log(content.content.length);
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| 184 | //document.getElementById('content').innerHTML += contentObjectToHtml(content);
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| 185 | } else if (kind == Closure.UPCALL_INTEREST_TIMED_OUT) {
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| 186 | console.log("Closure.upcall called with interest time out.");
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| 187 | }
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| 188 | return Closure.RESULT_OK;
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| 189 | };
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| 190 | */
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| 191 |
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| 192 | function run() {
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| 193 | document.getElementById('content').innerHTML += "<p>Started...</p>";
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| 194 | //ndn.expressInterest(new Name(document.getElementById('interest').value), new AsyncGetClosure( new Date() ));
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| 195 | var name = new Name(document.getElementById('interest').value);
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| 196 | ndncon.expressInterest( name,
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| 197 | new ContentClosure( ndncon, new Date() ));
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| 198 | }
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| 199 |
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| 200 | </script>
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| 201 |
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| 202 | </head>
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| 203 | <body >
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| 204 |
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| 205 | <form>
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| 206 | Please Enter an Interest:<br />
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| 207 | <input id="interest" type="text" name="INTEREST" size="50" value="/wentao.shang/choir_jail.png" />
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| 208 | </form>
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| 209 |
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| 210 | <button onclick="run()">Fetch Content</button>
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| 211 |
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| 212 | <p id="content">Result: <br/></p>
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| 213 |
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| 214 | </body>
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| 215 | </html>
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