initial

main.py

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+import queue
+from flask import Flask, render_template, request, make_response
+from flask_socketio import SocketIO #https://pythonprogramminglanguage.com/python-flask-websocket/
+import sqlite3
+import time
+import atexit
+import sys
+
+db_path = 'mate.db'
+conn = sqlite3.connect(db_path)
+c = conn.cursor()
+
+app = Flask(__name__)
+socketio = SocketIO(app)
+app.debug = True
+
+status = True
+users = queue.Queue()
+finished = None
+
+def exit_handler():
+    conn.close()
+    sys.exit("Program sucsesfully exited")
+
+#website
+@app.route("/")
+def index():
+    return '<a href="/list">user and tag list</a> <p>The creator of this website accepts no liability for any linguistic or technical errors!</p>'
+
+@app.route("/list")
+def list():
+    c.execute("SELECT * FROM users")   
+    users = c.fetchall()
+    text = ""
+    for i in users:
+        text = text + f'<p>{i[1]}: {i[2]} <form action="/addtag" method="get"><input name="id" type="hidden" value="{i[0]}"><button type="submit">Add Tag</button></form><form action="/change" method="get"><input name="id" type="hidden" value="{i[0]}"> Change balance: <input name="change"><input type="submit"></form></p><br></br>'
+    return '<form action="/list/user" method="get"> Search for User: <input name="user"><input type="submit"></form> <form action="/adduser" method="get"><button type="submit">Add User</button></form> <br></br>' + text 
+
+@app.route("/list/user", methods=['GET'])
+def user():
+    username = request.args.get("user")
+    c.execute("SELECT * FROM users WHERE username = '%s'" % username)
+    user = c.fetchall()
+    if user != []:
+        user = user[0]
+        return f'<p>{user[1]}: {user[2]} <form action="/addtag" method="get"><input name="id" type="hidden" value="{user[0]}"><button type="submit">Add Tag</button></form><form action="/change" method="get"><input name="id" type="hidden" value="{user[0]}"> Change balance: <input name="change"><input type="submit"></form></p>'
+    else:
+        return "User does not exists"
+
+@app.route("/adduser")
+def new_user():
+    return render_template("adduser.html")
+
+@app.route("/adduser/user", methods=['GET'])
+def adduser():
+    user = request.args.get("username")
+    c.execute(f"SELECT * FROM users WHERE username='{str(user)}'")
+    if c.fetchall() == []:
+        c.execute("INSERT or IGNORE INTO users (username, balance) VALUES ('%s', 0)" % user)
+        conn.commit()
+        return "alert('Added userd')"
+    else:
+        return "alert('User already exists')"
+
+
+@app.route("/change", methods=['GET'])
+def change():
+    user_id = int(request.args.get("id"))
+    try: 
+        change = int(request.args.get("change"))
+    except ValueError:
+        return '<p>Pleas enter a number!</p><a href="/list">tags and user list</a>'
+    if change < 0:
+        text = "removed from"
+    elif change > 0:
+        text = "added to"
+    elif change == 0:
+        return "<p>Nothing was done!</p>"
+    c.execute(f"UPDATE users SET balance = balance + {change} WHERE id={user_id}")
+    c.execute(f"SELECT * FROM users WHERE id={user_id}")
+    user = c.fetchall()[0][1]
+    return f'<p>{change} was {text} {user}'
+
+@app.route("/addtag", methods=['GET'])
+def get_addtag_request():
+    global users 
+    try:
+        user_id = int(request.args.get("id"))
+    except:  #except im Normalen Code!
+        return "Wrong user id!"
+    users.put(user_id)
+    return render_template("addtag.html", user=user_id)
+
+@socketio.on('addtag')
+def request_addtag(data):
+    global finished
+    if len(users.queue) > 0:
+        user = users.queue[len(users.queue) - 1]
+        if user == data["data"]:
+            socketio.emit("wait", "wait")
+            i = 0
+            while finished != data["data"]:
+                time.sleep(1)
+                i += 1
+                if i > 20:
+                    socketio.emit("error", "timeout")
+                    nothing = users.get()
+                    pass
+            c.execute(f"SELECT * FROM users WHERE id ={user}")
+            username = c.fetchall()[0][1]
+            c.execute(f"SELECT * FROM tags WHERE userid={user}")
+            tag_id = c.fetchall()[0][0]
+            socketio.emit("finished", f"Added {tag_id} to {username}")
+        else:
+            socketio.emit("busy", "busy")
+    else:
+        socketio.emit("error", "error")
+
+#api
+@app.route("/api/tag_id", methods=['GET'])
+def get_id():
+    global users
+    global finished
+    tag_id = int(request.args.get("id"))
+    c.execute(f"SELECT * FROM tags WHERE tagid ={tag_id}")
+    tag_list = c.fetchall()
+    if tag_list != []:
+        tag = tag_list[0]
+        if users.qsize() == 0:
+            c.execute(f"UPDATE users SET balance = balance - 1 WHERE id={tag[1]}")
+            conn.commit() 
+            return make_response("True")
+
+    elif users.qsize() > 0:
+        user = users.get()
+        c.execute(f"INSERT OR IGNORE INTO tags (tagid, userid) VALUES ({tag_id}, {user})")
+        conn.commit()
+        finished = user
+        return make_response("True")
+
+    return make_response("False")  
+
+def main():
+    atexit.register(exit_handler)
+    socketio.run(app)
+main()

templates/addtag.html

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+<!DOCTYPE html>
+<html lang="en">
+   <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.1/socket.io.js" integrity="sha512-q/dWJ3kcmjBLU4Qc47E4A9kTB4m3wuTY7vkFJDTZKjTs8jhyGQnaUrxa0Ytd0ssMZhbNua9hE+E7Qv1j+DyZwA==" crossorigin="anonymous"></script>
+   <script type="text/javascript" charset="utf-8">
+        var socket = io();
+        var user = {{ user }}
+        socket.on('connect', function() {
+            socket.emit('addtag', {data: user});
+        });  
+        socket.on("busy", function(){
+            document.write('<p>the nfc reader is busy at the moment. Pleas Wait ...</p>')
+            socket.emit('addtag', {data: user})
+        });
+        socket.on("wait", function(){
+            document.write('<p>wait</p>')
+        });
+        socket.on("error", function(data) {
+            alert(data)
+            window.location="http://localhost:5000/"
+        });
+        socket.on("finished", function(data){
+            alert(data)
+            window.location="http://localhost:5000/"
+        });
+   </script>
+</html>

templates/adduser.html

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+<!DOCTYPE html>
+<html lang="en">
+   <p>
+    Username:
+    <form action="/adduser/user" method="get"><input name="username"><input type="submit"></form>
+   </p>
+</html>

templates/change.html

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+<!DOCTYPE html>
+<html lang="en">
+   <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.1/socket.io.js" integrity="sha512-q/dWJ3kcmjBLU4Qc47E4A9kTB4m3wuTY7vkFJDTZKjTs8jhyGQnaUrxa0Ytd0ssMZhbNua9hE+E7Qv1j+DyZwA==" crossorigin="anonymous"></script>
+   <script type="text/javascript" charset="utf-8">
+        var socket = io();
+        var change = {{change}}
+        socket.on('connect', function() {
+            socket.emit('addtag', {data: user});
+        });  
+        socket.on("besetzt", function(){
+            document.write('<p>besetzt</p>')
+            socket.emit('addtag', {data: user})
+        });
+        socket.on("wait", function(){
+            document.write('<p>wait</p>')
+        });
+        socket.on("error", function(data) {
+            alert(data)
+            window.location="http://localhost:5000/"
+        });
+        socket.on("finished", function(data){
+            alert(data)
+            window.location="http://localhost:5000/"
+        });
+   </script>
+</html>