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#!/usr/bin/env python3
import argparse
import asyncio
import logging
import os
import sys
from typing import Dict
import graphviz
import uvicorn
from fastapi import FastAPI
from fastapi.responses import Response
from labgrid.remote.client import ClientSession, start_session
from labgrid.remote.common import Place
from labgrid.resource import Resource
from labgrid.util.proxy import proxymanager
async def do_graph(session: ClientSession) -> bytes:
'''Generate a graphviz graph of the current configuration.
Graph displays:
- all resources, grouped by groupname and exporter.
- all places, with a list of tags
- solid edges between places and acquired resources
- dotted edges between places and unacquired resources
- edges between resources and places carry the match name if any.
'''
def res_node_attr(name: str, resource: Resource) -> Dict[str, str]:
return {
'shape': 'plaintext',
'label': f'''<
<table bgcolor="peru">
<tr>
<td border="0" align="left">Resource</td>
</tr>
<tr>
<td port="cls">{resource.cls}</td>
<td port="name" bgcolor="white">{name}</td>
</tr>
</table>>''',
}
def place_node_attr(name: str, place: Place) -> Dict[str, str]:
acquired = ''
bgcolor = 'lightblue'
if place.acquired:
bgcolor = 'cornflowerblue'
acquired = f'<td port="user" border="0" align="right"><b>{place.acquired}</b></td>'
tags = '<tr><td border="0" align="left">Tags</td></tr>' if place.tags else ''
for k, v in place.tags.items():
tags += f'<tr><td border="0"></td><td border="0" align="left">{k}={v}</td></tr>'
return {
'shape': 'plaintext',
'label': f'''<
<table bgcolor="{bgcolor}">
<tr>
<td border="0" align="left">Place</td>
{acquired}
</tr>
<tr>
<td port="name" colspan="2" bgcolor="white">{name}</td>
</tr>
{tags}
</table>>''',
}
g = graphviz.Digraph('G')
g.attr(rankdir='LR')
paths = {}
for exporter, groups in session.resources.items():
g_exporter = graphviz.Digraph(f'cluster_{exporter}')
g_exporter.attr(label=exporter)
for group, resources in groups.items():
g_group = graphviz.Digraph(f'cluster_{group}')
g_group.attr(label=group)
for r_name, entry in resources.items():
res_node = f'{exporter}/{group}/{entry.cls}/{r_name}'.replace(':', '_')
paths[res_node] = [exporter, group, entry.cls, r_name]
g_group.node(res_node, **res_node_attr(r_name, entry))
g_exporter.subgraph(g_group)
g.subgraph(g_exporter)
for p_node, place in session.places.items():
g.node(p_node, **place_node_attr(p_node, place))
for m in place.matches:
for node, p in paths.items():
if m.ismatch(p):
g.edge(
f'{node}:name', p_node,
style='solid' if place.acquired else 'dotted',
label=m.rename if m.rename else None,
)
return g.pipe(format='svg')
def main():
app = FastAPI()
logger = logging.getLogger('uvicorn')
@app.get('/labgrid/graph')
async def get_graph() -> str:
'''Show a graph of the current infrastructure.'''
svg = await do_graph(session)
return Response(content=svg, media_type='image/svg+xml')
parser = argparse.ArgumentParser(
description='Labgrid webapp',
formatter_class=argparse.RawDescriptionHelpFormatter,
)
parser.add_argument(
'--coordinator',
'-x',
metavar='URL',
default=os.environ.get('LG_COORDINATOR', '127.0.0.1:20408'),
help='Coordinator address as HOST[:PORT] (default: %(default)s)',
)
parser.add_argument('--port', type=int, default=8800, help='Port to serve on')
parser.add_argument('--proxy', '-P', help='Proxy connections via given ssh host')
args = parser.parse_args()
if args.proxy:
proxymanager.force_proxy(args.proxy)
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
try:
session = start_session(
args.coordinator,
loop=loop,
)
except ConnectionRefusedError:
logger.fatal('Unable to connect to labgrid coordinator')
return
server = uvicorn.Server(config=uvicorn.Config(
loop=loop,
host='0.0.0.0',
port=args.port,
app=app,
))
logger.info('Available routes:')
for route in app.routes:
reserved_routes = ['/openapi.json', '/docs', '/docs/oauth2-redirect', '/redoc']
if route.path not in reserved_routes:
logger.info(f' - {route.path}')
try:
loop.run_until_complete(server.serve())
finally:
loop.run_until_complete(session.stop())
loop.run_until_complete(session.close())
if __name__ == '__main__':
sys.exit(main())
|
