*️⃣¶

👆 💪 ⚙️ ️⃣ ⏮️ FastAPI*.

❎ `WebSockets`¶

🥇 👆 💪 ❎ WebSockets:

$ pip install websockets

---> 100%

*️⃣ 👩‍💻¶

🏭¶

👆 🏭 ⚙️, 👆 🎲 ✔️ 🕸 ✍ ⏮️ 🏛 🛠️ 💖 😥, Vue.js ⚖️ 📐.

& 🔗 ⚙️ *️⃣ ⏮️ 👆 👩‍💻 👆 🔜 🎲 ⚙️ 👆 🕸 🚙.

⚖️ 👆 💪 ✔️ 🇦🇸 📱 🈸 👈 🔗 ⏮️ 👆 *️⃣ 👩‍💻 🔗, 🇦🇸 📟.

⚖️ 👆 5️⃣📆 ✔️ 🙆 🎏 🌌 🔗 ⏮️ *️⃣ 🔗.

✋️ 👉 🖼, 👥 🔜 ⚙️ 📶 🙅 🕸 📄 ⏮️ 🕸, 🌐 🔘 📏 🎻.

👉, ↗️, 🚫 ⚖ & 👆 🚫🔜 ⚙️ ⚫️ 🏭.

🏭 👆 🔜 ✔️ 1️⃣ 🎛 🔛.

✋️ ⚫️ 🙅 🌌 🎯 🔛 💽-🚄 *️⃣ & ✔️ 👷 🖼:

from fastapi import FastAPI, WebSocket
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
            <input type="text" id="messageText" autocomplete="off"/>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
            var ws = new WebSocket("ws://localhost:8000/ws");
            ws.onmessage = function(event) {
                var messages = document.getElementById('messages')
                var message = document.createElement('li')
                var content = document.createTextNode(event.data)
                message.appendChild(content)
                messages.appendChild(message)
            };
            function sendMessage(event) {
                var input = document.getElementById("messageText")
                ws.send(input.value)
                input.value = ''
                event.preventDefault()
            }
        </script>
    </body>
</html>
"""


@app.get("/")
async def get():
    return HTMLResponse(html)


@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await websocket.accept()
    while True:
        data = await websocket.receive_text()
        await websocket.send_text(f"Message text was: {data}")

✍ `websocket`¶

👆 FastAPI 🈸, ✍ websocket:

from fastapi import FastAPI, WebSocket
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
            <input type="text" id="messageText" autocomplete="off"/>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
            var ws = new WebSocket("ws://localhost:8000/ws");
            ws.onmessage = function(event) {
                var messages = document.getElementById('messages')
                var message = document.createElement('li')
                var content = document.createTextNode(event.data)
                message.appendChild(content)
                messages.appendChild(message)
            };
            function sendMessage(event) {
                var input = document.getElementById("messageText")
                ws.send(input.value)
                input.value = ''
                event.preventDefault()
            }
        </script>
    </body>
</html>
"""


@app.get("/")
async def get():
    return HTMLResponse(html)


@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await websocket.accept()
    while True:
        data = await websocket.receive_text()
        await websocket.send_text(f"Message text was: {data}")

📡 ℹ

👆 💪 ⚙️ from starlette.websockets import WebSocket.

FastAPI 🚚 🎏 WebSocket 🔗 🏪 👆, 👩‍💻. ✋️ ⚫️ 👟 🔗 ⚪️➡️ 💃.

⌛ 📧 & 📨 📧¶

👆 *️⃣ 🛣 👆 💪 await 📧 & 📨 📧.

from fastapi import FastAPI, WebSocket
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
            <input type="text" id="messageText" autocomplete="off"/>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
            var ws = new WebSocket("ws://localhost:8000/ws");
            ws.onmessage = function(event) {
                var messages = document.getElementById('messages')
                var message = document.createElement('li')
                var content = document.createTextNode(event.data)
                message.appendChild(content)
                messages.appendChild(message)
            };
            function sendMessage(event) {
                var input = document.getElementById("messageText")
                ws.send(input.value)
                input.value = ''
                event.preventDefault()
            }
        </script>
    </body>
</html>
"""


@app.get("/")
async def get():
    return HTMLResponse(html)


@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await websocket.accept()
    while True:
        data = await websocket.receive_text()
        await websocket.send_text(f"Message text was: {data}")

👆 💪 📨 & 📨 💱, ✍, & 🎻 💽.

🔄 ⚫️¶

🚥 👆 📁 📛 main.py, 🏃 👆 🈸 ⏮️:

$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

📂 👆 🖥 http://127.0.0.1:8000.

👆 🔜 👀 🙅 📃 💖:

👆 💪 🆎 📧 🔢 📦, & 📨 👫:

& 👆 FastAPI 🈸 ⏮️ *️⃣ 🔜 📨 🔙:

👆 💪 📨 (& 📨) 📚 📧:

& 🌐 👫 🔜 ⚙️ 🎏 *️⃣ 🔗.

⚙️ `Depends` & 🎏¶

*️⃣ 🔗 👆 💪 🗄 ⚪️➡️ fastapi & ⚙️:

Depends
Security
Cookie
Header
Path
Query

👫 👷 🎏 🌌 🎏 FastAPI 🔗/➡ 🛠️:

from typing import Union

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">
            <label>Item ID: <input type="text" id="itemId" autocomplete="off" value="foo"/></label>
            <label>Token: <input type="text" id="token" autocomplete="off" value="some-key-token"/></label>
            <button onclick="connect(event)">Connect</button>
            <hr>
            <label>Message: <input type="text" id="messageText" autocomplete="off"/></label>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
        var ws = null;
            function connect(event) {
                var itemId = document.getElementById("itemId")
                var token = document.getElementById("token")
                ws = new WebSocket("ws://localhost:8000/items/" + itemId.value + "/ws?token=" + token.value);
                ws.onmessage = function(event) {
                    var messages = document.getElementById('messages')
                    var message = document.createElement('li')
                    var content = document.createTextNode(event.data)
                    message.appendChild(content)
                    messages.appendChild(message)
                };
                event.preventDefault()
            }
            function sendMessage(event) {
                var input = document.getElementById("messageText")
                ws.send(input.value)
                input.value = ''
                event.preventDefault()
            }
        </script>
    </body>
</html>
"""


@app.get("/")
async def get():
    return HTMLResponse(html)


async def get_cookie_or_token(
    websocket: WebSocket,
    session: Union[str, None] = Cookie(default=None),
    token: Union[str, None] = Query(default=None),
):
    if session is None and token is None:
        raise WebSocketException(code=status.WS_1008_POLICY_VIOLATION)
    return session or token


@app.websocket("/items/{item_id}/ws")
async def websocket_endpoint(
    websocket: WebSocket,
    item_id: str,
    q: Union[int, None] = None,
    cookie_or_token: str = Depends(get_cookie_or_token),
):
    await websocket.accept()
    while True:
        data = await websocket.receive_text()
        await websocket.send_text(
            f"Session cookie or query token value is: {cookie_or_token}"
        )
        if q is not None:
            await websocket.send_text(f"Query parameter q is: {q}")
        await websocket.send_text(f"Message text was: {data}, for item ID: {item_id}")

Info

👉 *️⃣ ⚫️ 🚫 🤙 ⚒ 🔑 🤚 HTTPException, ↩️ 👥 🤚 WebSocketException.

👆 💪 ⚙️ 📪 📟 ⚪️➡️ ☑ 📟 🔬 🔧.

🔄 *️⃣ ⏮️ 🔗¶

🚥 👆 📁 📛 main.py, 🏃 👆 🈸 ⏮️:

$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

📂 👆 🖥 http://127.0.0.1:8000.

📤 👆 💪 ⚒:

"🏬 🆔", ⚙️ ➡.
"🤝" ⚙️ 🔢 🔢.

Tip

👀 👈 🔢 token 🔜 🍵 🔗.

⏮️ 👈 👆 💪 🔗 *️⃣ & ⤴️ 📨 & 📨 📧:

🚚 🔀 & 💗 👩‍💻¶

🕐❔ *️⃣ 🔗 📪, await websocket.receive_text() 🔜 🤚 WebSocketDisconnect ⚠, ❔ 👆 💪 ⤴️ ✊ & 🍵 💖 👉 🖼.

from typing import List

from fastapi import FastAPI, WebSocket, WebSocketDisconnect
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <h2>Your ID: <span id="ws-id"></span></h2>
        <form action="" onsubmit="sendMessage(event)">
            <input type="text" id="messageText" autocomplete="off"/>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
            var client_id = Date.now()
            document.querySelector("#ws-id").textContent = client_id;
            var ws = new WebSocket(`ws://localhost:8000/ws/${client_id}`);
            ws.onmessage = function(event) {
                var messages = document.getElementById('messages')
                var message = document.createElement('li')
                var content = document.createTextNode(event.data)
                message.appendChild(content)
                messages.appendChild(message)
            };
            function sendMessage(event) {
                var input = document.getElementById("messageText")
                ws.send(input.value)
                input.value = ''
                event.preventDefault()
            }
        </script>
    </body>
</html>
"""


class ConnectionManager:
    def __init__(self):
        self.active_connections: List[WebSocket] = []

    async def connect(self, websocket: WebSocket):
        await websocket.accept()
        self.active_connections.append(websocket)

    def disconnect(self, websocket: WebSocket):
        self.active_connections.remove(websocket)

    async def send_personal_message(self, message: str, websocket: WebSocket):
        await websocket.send_text(message)

    async def broadcast(self, message: str):
        for connection in self.active_connections:
            await connection.send_text(message)


manager = ConnectionManager()


@app.get("/")
async def get():
    return HTMLResponse(html)


@app.websocket("/ws/{client_id}")
async def websocket_endpoint(websocket: WebSocket, client_id: int):
    await manager.connect(websocket)
    try:
        while True:
            data = await websocket.receive_text()
            await manager.send_personal_message(f"You wrote: {data}", websocket)
            await manager.broadcast(f"Client #{client_id} says: {data}")
    except WebSocketDisconnect:
        manager.disconnect(websocket)
        await manager.broadcast(f"Client #{client_id} left the chat")

🔄 ⚫️ 👅:

📂 📱 ⏮️ 📚 🖥 📑.
✍ 📧 ⚪️➡️ 👫.
⤴️ 🔐 1️⃣ 📑.

👈 🔜 🤚 WebSocketDisconnect ⚠, & 🌐 🎏 👩‍💻 🔜 📨 📧 💖:

Client #1596980209979 left the chat

Tip

📱 🔛 ⭐ & 🙅 🖼 🎦 ❔ 🍵 & 📻 📧 📚 *️⃣ 🔗.

✋️ ✔️ 🤯 👈, 🌐 🍵 💾, 👁 📇, ⚫️ 🔜 🕴 👷 ⏪ 🛠️ 🏃, & 🔜 🕴 👷 ⏮️ 👁 🛠️.

🚥 👆 💪 🕳 ⏩ 🛠️ ⏮️ FastAPI ✋️ 👈 🌖 🏋️, 🐕‍🦺 ✳, ✳ ⚖️ 🎏, ✅ 🗜/📻.

🌅 ℹ¶

💡 🌅 🔃 🎛, ✅ 💃 🧾: