From 602790e2ca33ad7f22235bf2ae548cef7db8b814 Mon Sep 17 00:00:00 2001
From: Mitch Riedstra <mitch@riedstra.us>
Date: Sat, 9 Jan 2021 15:22:27 -0500
Subject: Add a progress bar to the UI for installation via HTTP. Uses polling,
 but whatever.

---
 cmd/web/js.go | 109 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 cmd/web/js.go

(limited to 'cmd/web/js.go')

diff --git a/cmd/web/js.go b/cmd/web/js.go
new file mode 100644
index 0000000..0d54fab
--- /dev/null
+++ b/cmd/web/js.go
@@ -0,0 +1,109 @@
+package main
+
+import (
+	// "io/ioutil"
+	"net/http"
+)
+
+func jsHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Add("Content-type", "application/javascript")
+	_, err := w.Write([]byte(`
+// pretty print duration when given in seconds
+function formatDuration(dur) {
+	var out = "";
+
+	var hours = 0;
+	var minutes = 0;
+
+	if(dur > (60*60)){
+		hours = Math.trunc(dur/(60*60))
+		out = out + hours + " hours "
+	}
+
+	if(dur > 60){
+		minutes = Math.trunc((dur-(hours*60*60))/60)
+		out = out + minutes + " minutes "
+	}
+
+	seconds = Math.trunc(dur - ( (hours*60*60) + (minutes*60) ))
+	out = out + seconds + " seconds "
+
+	return out;
+}
+
+function setStatus(stat) {
+    var elem = document.getElementById("installBar");
+	var msg = document.getElementById("message");
+
+	// console.log(stat)
+
+	if(stat.Running) {
+		percent = Math.round((stat.Transferred/stat.Size)*10000)/100;
+
+		var t = Date.parse(stat.Start);
+		// var n = Date.now();
+		var elapsed = Date.now() - t;
+		var trans = (stat.Transferred/1024/1024);
+
+		console.log(trans)
+		console.log(elapsed / 1000)
+		
+		var rate = Math.round(trans / (elapsed / 1000))
+
+		elem.style.width = percent + "%";
+		elem.innerHTML = percent + "%";
+		elem.style.display = "";
+
+		// in seconds
+		var eta = Math.round(((stat.Size - trans)/1024/1024) / rate);
+
+		msg.innerHTML = "Installing: " + stat.Url
+			+ "\nRate: " + rate + "mb/s"
+			+ "\nEta: " + formatDuration(eta);
+		msg.style.display = "";
+	} 
+
+	if(!stat.Running && stat.Transferred >= 50 && stat.Error == null) {
+		elem.style.width = 100 + "%";
+		elem.innerHTML = 100 + "%";
+		msg.innerHTML = "Completed install for: " + stat.Url;
+		elem.style.display = "";
+		msg.style.display = "";
+	}
+
+	if(stat.Error != null) {
+		msg.innerHTML = "Errors encountered while installing from: \n\n" 
+						+ stat.Url + "\n\n" +
+						JSON.stringify(stat.Error, undefined, 2);
+		elem.style.display = "hidden";
+		msg.style.display = "";
+	}
+}
+
+function updateStatus() {
+window.fetch('/status')
+    .then(function(response){
+        return response.json();
+    }).then(function(json){
+		return setStatus(json);
+    });
+}
+
+document.addEventListener("DOMContentLoaded",function(){
+  setInterval(updateStatus, 750);
+});
+`))
+
+	/*
+		b, err := ioutil.ReadFile("C:\\Users\\mitch\\Documents\\my.js")
+		if err != nil {
+			Logger.Printf("While reading js: %s", err)
+			return
+		}
+		_, err = w.Write(b)
+	*/
+
+	if err != nil {
+		Logger.Printf("While sending js: %s", err)
+	}
+}
-- 
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