plugins/
  my-plugin/
    plugin.py       # AirflowPlugin subclass — auto-discovered by Airflow
    static/
      index.html
      app.js
    assets/
      icon.svg

from pathlib import Path
from airflow.plugins_manager import AirflowPlugin
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse

BASE_DIR = Path(__file__).parent

app = FastAPI(title="My Plugin")

# Both directories must exist before Airflow starts or FastAPI raises on import
app.mount("/static", StaticFiles(directory=BASE_DIR / "static"), name="static")
app.mount("/assets", StaticFiles(directory=BASE_DIR / "assets"), name="assets")


class MyPlugin(AirflowPlugin):
    name = "my_plugin"

    fastapi_apps = [
        {
            "app": app,
            "url_prefix": "/my-plugin",   # plugin available at {AIRFLOW_HOST}/my-plugin/
            "name": "My Plugin",
        }
    ]

    external_views = [
        {
            "name": "My Plugin",
            "href": "my-plugin/ui",              # NO leading slash — breaks on Astro and reverse proxies
            "destination": "nav",                # see locations table below
            "category": "browse",                # nav bar category (nav destination only)
            "url_route": "my-plugin",            # unique route name (required for React apps)
            "icon": "/my-plugin/static/icon.svg" # DOES use a leading slash — served by FastAPI
        }
    ]

from airflow.plugins_manager import AirflowPlugin

class LearnViewPlugin(AirflowPlugin):
    name = "learn_view_plugin"

    external_views = [
        {
            "name": "Learn Airflow 3",
            "href": "https://www.astronomer.io/docs/learn",
            "destination": "dag",   # adds a tab to every Dag page
            "url_route": "learn"
        }
    ]

@app.get("/ui", response_class=FileResponse)
async def serve_ui():
    return FileResponse(BASE_DIR / "static" / "index.html")

<!-- correct -->
<link rel="stylesheet" href="static/app.css" />
<script src="static/app.js?v=20240315"></script>

<!-- breaks behind a reverse proxy -->
<script src="/my-plugin/static/app.js"></script>

fetch('api/dags')           // correct — relative to current page
fetch('/my-plugin/api/dags') // breaks on Astro and sub-path deploys

import asyncio
import os
import threading
import time
import airflow_client.client as airflow_sdk
import requests

AIRFLOW_HOST  = os.environ.get("MYPLUGIN_HOST",     "http://localhost:8080")
AIRFLOW_USER  = os.environ.get("MYPLUGIN_USERNAME", "admin")
AIRFLOW_PASS  = os.environ.get("MYPLUGIN_PASSWORD", "admin")
AIRFLOW_TOKEN = os.environ.get("MYPLUGIN_TOKEN")    # Astronomer Astro: Deployment API token

_cached_token: str | None = None
_token_expires_at: float  = 0.0
_token_lock = threading.Lock()


def _fetch_fresh_token() -> str:
    """Exchange username/password for a JWT via Airflow's auth endpoint."""
    response = requests.post(
        f"{AIRFLOW_HOST}/auth/token",
        json={"username": AIRFLOW_USER, "password": AIRFLOW_PASS},
        timeout=10,
    )
    response.raise_for_status()
    return response.json()["access_token"]


def _get_token() -> str:
    # Astronomer Astro production: use static Deployment API token directly
    if AIRFLOW_TOKEN:
        return AIRFLOW_TOKEN
    global _cached_token, _token_expires_at
    now = time.monotonic()
    # Fast path — no lock if still valid
    if _cached_token and now < _token_expires_at:
        return _cached_token
    # Slow path — one thread refreshes, others wait
    with _token_lock:
        if _cached_token and now < _token_expires_at:
            return _cached_token
        _cached_token = _fetch_fresh_token()
        _token_expires_at = now + 55 * 60  # refresh 5 min before 1-hour expiry
    return _cached_token


def _make_config() -> airflow_sdk.Configuration:
    config = airflow_sdk.Configuration(host=AIRFLOW_HOST)
    config.access_token = _get_token()
    return config

from fastapi import HTTPException
from airflow_client.client.api import DAGApi

@app.get("/api/dags")
async def list_dags():
    try:
        def _fetch():
            with airflow_sdk.ApiClient(_make_config()) as client:
                return DAGApi(client).get_dags(limit=100).dags
        dags = await asyncio.to_thread(_fetch)
        return [{"dag_id": d.dag_id, "is_paused": d.is_paused, "timetable_summary": d.timetable_summary} for d in dags]
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

from airflow.models import DagBag, DagModel
from airflow.utils.db import provide_session

@app.get("/api/dags/status")
async def dag_status():
    def _fetch():
        @provide_session
        def _query(session=None):
            dagbag = DagBag()
            paused = sum(
                1 for dag_id in dagbag.dags
                if (m := session.query(DagModel).filter(DagModel.dag_id == dag_id).first())
                and m.is_paused
            )
            return {"total": len(dagbag.dags), "paused": paused}
        return _query()
    return await asyncio.to_thread(_fetch)

from airflow_client.client.api import DAGApi, DagRunApi
from airflow_client.client.models import TriggerDAGRunPostBody, DAGPatchBody


@app.post("/api/dags/{dag_id}/trigger")
async def trigger_dag(dag_id: str):
    def _run():
        with airflow_sdk.ApiClient(_make_config()) as client:
            return DagRunApi(client).trigger_dag_run(dag_id, TriggerDAGRunPostBody())
    result = await asyncio.to_thread(_run)
    return {"run_id": result.dag_run_id, "state": normalize_state(result.state)}


@app.patch("/api/dags/{dag_id}/pause")
async def toggle_pause(dag_id: str, is_paused: bool):
    def _run():
        with airflow_sdk.ApiClient(_make_config()) as client:
            DAGApi(client).patch_dag(dag_id, DAGPatchBody(is_paused=is_paused))
    await asyncio.to_thread(_run)
    return {"dag_id": dag_id, "is_paused": is_paused}


@app.delete("/api/dags/{dag_id}")
async def delete_dag(dag_id: str):
    def _run():
        with airflow_sdk.ApiClient(_make_config()) as client:
            DAGApi(client).delete_dag(dag_id)
    await asyncio.to_thread(_run)
    return {"deleted": dag_id}


def normalize_state(raw) -> str:
    """Convert SDK enum objects to plain strings before sending to the frontend."""
    if raw is None:
        return "never_run"
    return str(raw).lower()

from airflow_client.client.api import DagRunApi, TaskInstanceApi

# Latest run for a DAG
@app.get("/api/dags/{dag_id}/runs/latest")
async def latest_run(dag_id: str):
    def _fetch():
        with airflow_sdk.ApiClient(_make_config()) as client:
            runs = DagRunApi(client).get_dag_runs(dag_id, limit=1, order_by="-start_date").dag_runs
            return runs[0] if runs else None
    run = await asyncio.to_thread(_fetch)
    if not run:
        return {"state": "never_run"}
    return {"run_id": run.dag_run_id, "state": normalize_state(run.state)}


# Task instances for a specific run
@app.get("/api/dags/{dag_id}/runs/{run_id}/tasks")
async def task_instances(dag_id: str, run_id: str):
    def _fetch():
        with airflow_sdk.ApiClient(_make_config()) as client:
            return TaskInstanceApi(client).get_task_instances(dag_id, run_id).task_instances
    tasks = await asyncio.to_thread(_fetch)
    return [{"task_id": t.task_id, "state": normalize_state(t.state)} for t in tasks]


# Task log (try_number starts at 1)
@app.get("/api/dags/{dag_id}/runs/{run_id}/tasks/{task_id}/logs/{try_number}")
async def task_log(dag_id: str, run_id: str, task_id: str, try_number: int):
    def _fetch():
        with airflow_sdk.ApiClient(_make_config()) as client:
            return TaskInstanceApi(client).get_log(
                dag_id, run_id, task_id, try_number, map_index=-1
            )
    result = await asyncio.to_thread(_fetch)
    return {"log": result.content if hasattr(result, "content") else str(result)}

import requests
from starlette.responses import StreamingResponse

@app.get("/api/files/{filename}")
async def proxy_file(filename: str):
    def _stream():
        r = requests.get(f"https://files.example.com/{filename}", stream=True)
        r.raise_for_status()
        return r
    response = await asyncio.to_thread(_stream)
    return StreamingResponse(
        response.iter_content(chunk_size=8192),
        media_type="application/octet-stream",
        headers={"Content-Disposition": f'attachment; filename="{filename}"'},
    )

from airflow.plugins_manager import AirflowPlugin

def format_confidence(confidence: float) -> str:
    return f"{confidence * 100:.2f}%"

class MyPlugin(AirflowPlugin):
    name = "my_plugin"
    macros = [format_confidence]

{{ macros.my_plugin.format_confidence(0.95) }}

{{ macros.my_plugin.format_confidence(ti.xcom_pull(task_ids='score_task')['confidence']) }}

from starlette.middleware.base import BaseHTTPMiddleware
from fastapi import Request, Response

class AuditMiddleware(BaseHTTPMiddleware):
    async def dispatch(self, request: Request, call_next) -> Response:
        # runs before every request to the Airflow API server
        response = await call_next(request)
        return response

class MyPlugin(AirflowPlugin):
    name = "my_plugin"
    fastapi_root_middlewares = [
        {"middleware": AuditMiddleware, "args": [], "kwargs": {}, "name": "Audit"}
    ]

from airflow.sdk.bases.operatorlink import BaseOperatorLink

class MyDashboardLink(BaseOperatorLink):
    name = "Open in Dashboard"

    def get_link(self, operator, *, ti_key, **context) -> str:
        return f"https://my-dashboard.example.com/tasks/{ti_key.task_id}"

class MyPlugin(AirflowPlugin):
    name = "my_plugin"
    global_operator_extra_links = [MyDashboardLink()]  # appears on every task
    # operator_extra_links = [MyDashboardLink()]       # attach to specific operator instead

// In your bundle (e.g. my-app.js)
globalThis['My Plugin'] = MyComponent;   // matches plugin name
globalThis.AirflowPlugin = MyComponent;  // fallback Airflow looks for

class MyPlugin(AirflowPlugin):
    name = "my_plugin"
    fastapi_apps = [{"app": app, "url_prefix": "/my-plugin", "name": "My Plugin"}]
    react_apps = [
        {
            "name": "My Plugin",
            "bundle_url": "/my-plugin/my-app.js",
            "destination": "nav",
            "category": "browse",
            "url_route": "my-plugin",
        }
    ]

react_apps = [
    {"name": "My Widget", "bundle_url": "/my-plugin/widget.js", "destination": "nav",  "url_route": "my-widget-nav"},
    {"name": "My Widget", "bundle_url": "/my-plugin/widget.js", "destination": "dag",  "url_route": "my-widget-dag"},
]

AIRFLOW_HOST = os.environ.get("MYPLUGIN_HOST",     "http://localhost:8080")
AIRFLOW_USER = os.environ.get("MYPLUGIN_USERNAME", "admin")
AIRFLOW_PASS = os.environ.get("MYPLUGIN_PASSWORD", "admin")

# .env
MYPLUGIN_HOST=http://localhost:8080
MYPLUGIN_USERNAME=admin
MYPLUGIN_PASSWORD=admin

astro dev restart              # required after any Python plugin change

# Check logs by component (Astro CLI):
astro dev logs --api-server    # FastAPI apps, external_views — plugin import errors show here
astro dev logs --scheduler     # macros, timetables, listeners, operator links
astro dev logs --dag-processor # DAG parsing errors

# Non-Astro:
airflow plugins                # CLI — lists all loaded plugins

astro deployment variable create --deployment-id <id> MYPLUGIN_HOST=https://airflow.example.com

AIRFLOW__CORE__LAZY_LOAD_PLUGINS=False

<script src="static/app.js?v=20240315-1"></script>