skepticoin · refacktor · Jun 16, 2021 · Jun 17, 2021
diff --git a/requirements.txt b/requirements.txt
@@ -3,3 +3,4 @@ immutables==0.15
 pytest-mock==3.6.1
 pytest==6.2.4
 scrypt==0.8.18
+flask==2.0.1
diff --git a/setup.py b/setup.py
@@ -35,6 +35,7 @@
             'skepticoin-repl=skepticoin.scripts.repl:main',
             'skepticoin-run=skepticoin.scripts.run:main',
             'skepticoin-balance=skepticoin.scripts.balance:main',
+            'skepticoin-gui=skepticoin.scripts.gui:main',
         ],
     },
 

diff --git a/skepticoin/gui/http_handler.py b/skepticoin/gui/http_handler.py
@@ -0,0 +1,42 @@
+from typing import Dict, Tuple
+from flask import Flask
+from .services import SkepticoinService
+from .web_app_loader import WEB_APP_LOADER
+
+
+app = Flask(__name__)
+skeptis = SkepticoinService()
+
+
+@app.route("/")
+def webRoot() -> str:
+    return WEB_APP_LOADER  # type: ignore #  mypy bug!?
+
+
+@app.route('/event-stream')
+def event_stream() -> Tuple[str, int, Dict[str, str]]:
+    msg = skeptis.event_queue.pop() if skeptis.event_queue else 'Nothing Is Happening'
+    return ('data: %s\n\n' % msg, 200, {
+        'Content-Type': 'text/event-stream',
+        'Cache-Control': 'no-cache'
+    })
+
+
+@app.route('/wallet')
+def get_wallet() -> Dict[str, int]:
+    return {'size': len(skeptis.wallet.keypairs)}
+
+
+@app.route('/height')
+def get_height() -> Dict[str, int]:
+    height = len(skeptis.thread.local_peer.chain_manager.coinstate.block_by_hash)
+    return {'height': height}
+
+
+class HttpHandler:
+
+    @staticmethod
+    def server_loop() -> None:
+        app.run()
+
+    server_address = ('127.0.0.1', 5000)  # this is the flask default
diff --git a/skepticoin/gui/services.py b/skepticoin/gui/services.py
@@ -0,0 +1,45 @@
+from skepticoin.wallet import Wallet
+from threading import Thread
+
+from skepticoin.scripts.utils import (
+    open_or_init_wallet,
+    create_chain_dir,
+    read_chain_from_disk,
+    configure_logging_from_args,
+    start_networking_peer_in_background,
+    check_for_fresh_chain,
+    DefaultArgumentParser,
+)
+
+
+class SkepticoinService():
+
+    def __init__(self) -> None:
+
+        self.event_queue = ['Initializing']
+
+        initThread = Thread(target=lambda: self.run())
+        initThread.start()
+
+    def run(self) -> None:
+
+        self.event_queue.append('Doing some busywork')
+        parser = DefaultArgumentParser()
+        args = parser.parse_args()
+        configure_logging_from_args(args)
+
+        self.event_queue.append('Creating chain dir')
+        create_chain_dir()
+
+        self.event_queue.append('Reading chain from disk')
+        coinstate = read_chain_from_disk()
+
+        self.event_queue.append('Reading wallet')
+        self.wallet: Wallet = open_or_init_wallet()
+
+        # start our own peer so the GUI can have fresh blockchain
+        self.thread = start_networking_peer_in_background(args, coinstate)
+
+        self.event_queue.append('Waiting for Fresh Chain')
+        check_for_fresh_chain(self.thread)
+        self.event_queue.append("Chain up to date")
diff --git a/skepticoin/gui/web_app_loader.py b/skepticoin/gui/web_app_loader.py
@@ -0,0 +1,39 @@
+# Load the browser side of the GUI. 100% totally temporary code to demonstrate the architecture.
+WEB_APP_LOADER: str = """
+<html>
+<head>
+<script>
+if(typeof(EventSource)!="undefined") {
+   let source = new EventSource("/event-stream");
+   source.onmessage=function(event) {
+       console.log(event);
+       document.getElementById("result").innerHTML += event.data + "<br>";
+   }
+}
+else {
+   document.getElementById("result").innerHTML="No EventSource. Please upgrade your browser and try again.";
+}
+function showWallet() {
+    // simple function to demonstrate API call with browser-side processing
+    fetch('/wallet')
+        .then((response) => response.json())
+        .then(data => document.getElementById("result").innerHTML +=
+            'Your wallet has this many keys: ' + data.size + "<br>")
+}
+function showHeight() {
+    // simple function to demonstrate API call with browser-side processing
+    fetch('/height')
+        .then((response) => response.json())
+        .then(data => document.getElementById("result").innerHTML +=
+            'Your current blockchain height: ' + data.height + "<br>")
+}
+</script>
+</head>
+<body>
+(please don't click these until initialization is complete):
+<a href="javascript:showWallet()">show wallet</a> | <a href="javascript:showHeight()">show height</a>
+<p>IMPORTANT: Do not launch more than one browser window.</p>
+<div id="result">Loading...</div>
+</body>
+</html>
+"""
diff --git a/skepticoin/scripts/gui.py b/skepticoin/scripts/gui.py
@@ -0,0 +1,22 @@
+import webbrowser
+from threading import Thread
+from time import sleep
+
+from skepticoin.gui.http_handler import HttpHandler
+
+
+def main() -> None:
+
+    print('Starting local GUI server...')
+    serverThread = Thread(target=HttpHandler.server_loop)
+    serverThread.start()
+
+    print('Sleeping')
+    sleep(2)
+
+    print('Starting browser...')
+    webbrowser.open('http://%s:%d' % HttpHandler.server_address)
+
+    print('Waiting...')
+    # serverThread.stop() ???
+    serverThread.join()