WIP

assets/index.html

@@ -8,7 +8,7 @@
   <meta name="author" content="">
 
   <!-- automatically refresh the page every 30 seconds -->
-  <meta http-equiv="refresh" content="20">
+  <meta http-equiv="refresh" content="30">
 
   <title>Web Terminal</title>
 

assets/main.css

@@ -35,4 +35,4 @@
 .navbar-xs .navbar-nav>li>a {
     padding-top: 0px;
     padding-bottom: 0px;
-}
+}

assets/replay.html

@@ -37,39 +37,40 @@
             <div id="terminal_view"></div>
         </div>
         <div class="d-flex align-items-center">
-            <button type="button" class="btn btn-primary btn-sm" style="margin-right: 3px;">
+            <button type="button" class="btn btn-primary btn-sm" style="margin-right: 3px;" onclick="playbtn()">
                 <img src="/assets/play.svg" id="play-btn" height="18px">
             </button>
-            <div class="progress" id="replay-control" style="width: 906px;">
-                <div class="progress-bar bg-secondary" role="progressbar" style="width: 25%" aria-valuenow="25"
-                    aria-valuemin="0" aria-valuemax="100"></div>
-            </div>
+            <input type="range" class="form-range" min="0" max="100" id="replay-control"
+                onchange="console.log(this.value)">
         </div>
     </div>
 
-
     <script>
-        function Init() {
-            let term = createReplayTerminal();
-            var str = [
-                ' ┌────────────────────────────────────────────────────────────────────────────┐\n',
-                ' │                 \u001b[32;1mhttps://github.com/syssecfsu/witty\x1b[0m <- click it!            │\n',
-                ' └────────────────────────────────────────────────────────────────────────────┘\n',
-                ''
-            ].join('');
+        term = Init()
 
-            term.writeln(str);
+        var rc = document.querySelector("#replay-control")
+        rc.value = 0
 
-            // adjust the progress bar size to that of terminal
-            let vp = document.querySelector("#terminal")
-            let pbar = document.querySelector("#replay-control")
-            pbar.setAttribute("style", "width:" + (vp.offsetWidth - 32) + "px");
+        var icon = document.getElementById("play-btn")
+        var path = "/records/5FGD56YdzAYDGF9s_61e33645.rec"
+        var pause = false
 
-            
-            document.getElementById("play-btn").src = "/assets/pause.svg";
+        function playbtn() {
+            if (icon.src.includes("play")) {
+                icon.src = "/assets/pause.svg"
+                pause = false
+                replay_session(term, path, rc.value,
+                    function () {
+                        return pause
+                    },
+                    function (percent) {
+                        rc.value = percent
+                    })
+            } else {
+                icon.src = "/assets/play.svg"
+                pause = true
+            }
         }
-
-        Init()
     </script>
 
 </body>

assets/replay.js

@@ -1,46 +1,145 @@
+// create a xterm for replay
 function createReplayTerminal() {
-    // vscode-snazzy https://github.com/Tyriar/vscode-snazzy
-    // copied from xterm.js website
-    var baseTheme = {
-      foreground: '#eff0eb',
-      background: '#282a36',
-      selection: '#97979b33',
-      black: '#282a36',
-      brightBlack: '#686868',
-      red: '#ff5c57',
-      brightRed: '#ff5c57',
-      green: '#5af78e',
-      brightGreen: '#5af78e',
-      yellow: '#f3f99d',
-      brightYellow: '#f3f99d',
-      blue: '#57c7ff',
-      brightBlue: '#57c7ff',
-      magenta: '#ff6ac1',
-      brightMagenta: '#ff6ac1',
-      cyan: '#9aedfe',
-      brightCyan: '#9aedfe',
-      white: '#f1f1f0',
-      brightWhite: '#eff0eb'
-    };
-  
-    const term = new Terminal({
-      fontFamily: `'Fira Code', ui-monospace,SFMono-Regular,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace`,
-      fontSize: 12,
-      theme: baseTheme,
-      convertEol: true,
-      cursorBlink: true,
-    });
-  
-    term.open(document.getElementById('terminal_view'));
-    term.resize(124, 37);
-  
-    const weblinksAddon = new WebLinksAddon.WebLinksAddon();
-    term.loadAddon(weblinksAddon);
-  
-    // fit the xterm viewpoint to parent element
-    const fitAddon = new FitAddon.FitAddon();
-    term.loadAddon(fitAddon);
-    fitAddon.fit();
+  // vscode-snazzy https://github.com/Tyriar/vscode-snazzy
+  // copied from xterm.js website
+  var baseTheme = {
+    foreground: '#eff0eb',
+    background: '#282a36',
+    selection: '#97979b33',
+    black: '#282a36',
+    brightBlack: '#686868',
+    red: '#ff5c57',
+    brightRed: '#ff5c57',
+    green: '#5af78e',
+    brightGreen: '#5af78e',
+    yellow: '#f3f99d',
+    brightYellow: '#f3f99d',
+    blue: '#57c7ff',
+    brightBlue: '#57c7ff',
+    magenta: '#ff6ac1',
+    brightMagenta: '#ff6ac1',
+    cyan: '#9aedfe',
+    brightCyan: '#9aedfe',
+    white: '#f1f1f0',
+    brightWhite: '#eff0eb'
+  };
 
-    return term;
-  }
+  const term = new Terminal({
+    fontFamily: `'Fira Code', ui-monospace,SFMono-Regular,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace`,
+    fontSize: 12,
+    theme: baseTheme,
+    convertEol: true,
+    cursorBlink: true,
+  });
+
+  term.open(document.getElementById('terminal_view'));
+  term.resize(124, 37);
+
+  const weblinksAddon = new WebLinksAddon.WebLinksAddon();
+  term.loadAddon(weblinksAddon);
+
+  // fit the xterm viewpoint to parent element
+  const fitAddon = new FitAddon.FitAddon();
+  term.loadAddon(fitAddon);
+  fitAddon.fit();
+
+  return term;
+}
+
+// sleep for ms seconds
+function _sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+// we could sleep for a long time
+// periodically check if we need to end replay. 
+// This is pretty ugly but the callback mess otherwise
+async function sleep(ms, end) {
+  var loop_cnt = parseInt(ms / 20) + 1
+
+  for (i = 0; i < loop_cnt; i++) {
+    if (end()) {
+      return end()
+    }
+
+    await _sleep(20)
+  }
+
+  return end()
+}
+// convert data to uint8array, we cannot convert it to string as 
+// it will mess up special characters
+function base64ToUint8array(base64) {
+  var raw = window.atob(base64);
+  var rawLength = raw.length;
+  var array = new Uint8Array(new ArrayBuffer(rawLength));
+
+  for (i = 0; i < rawLength; i++) {
+    array[i] = raw.charCodeAt(i);
+  }
+  return array;
+}
+
+// replay session
+// term: xterm, path: session file to replay,
+// start: start position to replay in percentile, range 0-100
+// callback to update the progress bar
+async function replay_session(term, path, start, end, prog) {
+  var session
+
+  // read file from server
+  await fetch(path)
+    .then(res => res.json())
+    .then(out => {
+      session = out
+    })
+
+  var total_dur = 0
+  var cur = 0
+
+  //calculate the total duration
+  for (const item of session) {
+    item.Duration = parseInt(item.Duration / 1000000)
+    total_dur += item.Duration
+  }
+
+  start = parseInt(total_dur * start / 100)
+  console.log("Total duration:", total_dur, "start replay on", start)
+
+  term.reset()
+  for (const item of session) {
+    cur += item.Duration
+
+    // we will blast through the beginning of the session
+    if (cur >= start) {
+      if (await sleep(item.Duration, end) == true) {
+        return
+      }
+    }
+
+    if (item.Duration >= total_dur / 100) {
+      prog(cur * 100 / total_dur)
+    }
+
+    term.write(base64ToUint8array(item.Data))
+  }
+}
+
+function Init() {
+  let term = createReplayTerminal();
+  var str = [
+    ' ┌────────────────────────────────────────────────────────────────────────────┐\n',
+    ' │                 \u001b[32;1mhttps://github.com/syssecfsu/witty\x1b[0m <- click it!            │\n',
+    ' └────────────────────────────────────────────────────────────────────────────┘\n',
+    ''
+  ].join('');
+
+  term.writeln(str);
+
+  // adjust the progress bar size to that of terminal
+  var view = document.querySelector("#terminal")
+  var pbar = document.querySelector("#replay-control")
+  pbar.setAttribute("style", "width:" + (view.offsetWidth - 32) + "px");
+
+  return term
+}

assets/term.html

@@ -33,7 +33,7 @@
   </header>
 
 
-  <div style="margin-top: 5em;">
+  <div style="margin-top: 3em;">
     <div id="terminal">
       <div id="terminal_view"></div>
     </div>

cmd/replay/replay.go

@@ -40,7 +40,7 @@ func main() {
 	w, h, _ := term.GetSize(int(os.Stdout.Fd()))
 
 	if (w != 120) || (h != 36) {
-		log.Fatalln("Set terminal window to 120x36 before continue")
+		log.Println("Set terminal window to 120x36 before continue")
 	}
 
 	decoder := json.NewDecoder(fp)
@@ -49,6 +49,10 @@ func main() {
 		log.Fatalln("Failed to create JSON decoder")
 	}
 
+	// To work with javascript decoder, we organize the file as
+	// an array of writeRecord. golang decode instead decode
+	// as individual record. Call decoder.Token to skip opening [
+	decoder.Token()
 	for decoder.More() {
 		var record writeRecord
 
@@ -60,4 +64,6 @@ func main() {
 		time.Sleep(record.Dur)
 		t.Write(record.Data)
 	}
+
+	t.Write([]byte("\n\n---end of replay---\n\n"))
 }

main.go

@@ -140,6 +140,7 @@ func main() {
 
 	// handle static files
 	rt.Static("/assets", "./assets")
+	rt.Static("/records", "./records")
 
 	term_conn.Init(checkOrigin)
 

term_conn/relay.go

@@ -249,6 +249,7 @@ out:
 					log.Println("Failed to marshal record", err)
 				} else {
 					tc.record.Write(jbuf)
+					tc.record.Write([]byte(",")) // write a deliminator
 				}
 
 				tc.lastRecTime = time.Now()
@@ -266,8 +267,17 @@ out:
 					tc.record = nil
 				}
 
+				tc.record.Write([]byte("[")) // write a [ for an array of json objs
 				tc.lastRecTime = time.Now()
 			} else {
+				fsinfo, err := tc.record.Stat()
+
+				if err == nil {
+					tc.record.Truncate(fsinfo.Size() - 1)
+					tc.record.Seek(0, 2) // truncate does not change read/write location
+					tc.record.Write([]byte("]"))
+				}
+
 				tc.record.Close()
 				tc.record = nil
 			}