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server.py
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#!/usr/bin/env python3
from http.server import BaseHTTPRequestHandler, HTTPServer
import urllib
import subprocess
import json
import html
import sys
import time
import re
import os
import select
hostName = "localhost"
serverPort = 8088
blurb = open("./blurb.html","rb").read()
icon = open("./loogle.png","rb").read()
rev1 = "UNKNOWN"
try:
rev1 = subprocess.check_output(['git', 'rev-parse', 'HEAD']).decode('ascii').strip()
except _:
pass
rev2 = "UNKNOWN"
try:
manifest = json.load(open('lake-manifest.json'))
for package in manifest['packages']:
if package['name'] == "mathlib":
rev2 = package['rev']
except _:
pass
# Prometheus setup
import prometheus_client
m_info = prometheus_client.Info('versions', 'Lean and mathlib versions')
m_info.info({'loogle': rev1, 'mathlib': rev2})
m_queries = prometheus_client.Counter('queries', 'Total number of queries')
m_errors = prometheus_client.Counter('errors', 'Total number of failing queries')
m_results = prometheus_client.Histogram('results', 'Results per query', buckets=(0,1,2,5,10,50,100,200,500,1000))
m_heartbeats = prometheus_client.Histogram('heartbeats', 'Heartbeats per query', buckets=(0,2e0,2e1,2e2,2e3,2e4))
m_client = prometheus_client.Counter('clients', 'Clients used', ["client"])
for l in ("web", "zulip", "json", "nvim", "vscode-lean4", "vscode-loogle"): m_client.labels(l)
examples = [
"Real.sin",
"Real.sin, tsum",
"Real.sin (_ + 2*Real.pi)",
"List.replicate (_ + _) _",
"Real.sqrt ?a * Real.sqrt ?a",
]
class Loogle():
def __init__(self):
self.start()
def start(self):
self.starting = True
self.loogle = subprocess.Popen(
#[".lake/build/bin/loogle","--json", "--interactive", "--module","Std.Data.List.Lemmas"],
[".lake/build/bin/loogle","--json", "--interactive"],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
def do_query(self, query):
if self.starting:
r, w, e = select.select([ self.loogle.stdout ], [], [], 0)
if self.loogle.stdout in r:
greeting = self.loogle.stdout.readline()
if greeting != b"Loogle is ready.\n":
self.loogle.kill() # just to be sure
self.start()
return {"error": "The backend process did not send greeting, killing and restarting..."}
else:
self.starting = False
else:
return {"error": "The backend process is starting up, please try again later..."}
try:
self.loogle.stdin.write(bytes(query, "utf8"));
self.loogle.stdin.write(b"\n");
self.loogle.stdin.flush();
output_json = self.loogle.stdout.readline()
output = json.loads(output_json)
return output
except (IOError, json.JSONDecodeError) as e:
time.sleep(5) # to allow the process to die
code = self.loogle.poll()
if code == -31:
sys.stderr.write(f"Backend died trying to escape the sandbox.\n")
self.start()
return {"error":
f"Backend died trying to escape the sandbox. Restarting..."
}
if code is not None:
sys.stderr.write(f"Backend died with code {code}.\n")
self.start()
return {"error":
f"The backend process died with code {code}. Restarting..."
}
else:
sys.stderr.write(f"Backend did not respond ({e}).\n")
self.loogle.kill() # just to be sure
self.start()
return {"error": "The backend process did not respond, killing and restarting..."}
def query(self, query):
m_queries.inc()
print(f"Query: {json.dumps(query)}", flush=True)
output = self.do_query(query)
# Update metrics
if "error" in output:
m_errors.inc()
if "count" in output:
m_results.observe(output["count"])
if "heartbeats" in output:
m_heartbeats.observe(output["heartbeats"])
return output
loogle = Loogle()
# link formatting
def locallink(query):
return f"?q={urllib.parse.quote(query)}"
def querylink(query):
return f"https://loogle.lean-lang.org/?q={urllib.parse.quote(query)}"
def doclink(hit):
name = hit["name"]
modpath = hit["module"].replace(".","/")
return f"https://leanprover-community.github.io/mathlib4_docs/{urllib.parse.quote(modpath)}.html#{urllib.parse.quote(name)}"
def zulHit(hit):
return f"[{hit['name']}]({doclink(hit)})"
def zulQuery(sugg):
return f"[`{sugg}`]({querylink(sugg)})"
class MyHandler(prometheus_client.MetricsHandler):
def return404(self):
self.send_response(404)
self.send_header("Content-type", "text/plain")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Headers", "User-Agent, X-Loogle-Client")
self.end_headers()
self.wfile.write(b"Not found.\n")
def return400(self):
self.send_response(400)
self.send_header("Content-type", "text/plain")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Headers", "User-Agent, X-Loogle-Client")
self.end_headers()
try:
self.wfile.write(b"Invalid request.\n")
except BrokenPipeError:
# browsers seem to like to close this early
pass
def returnRedirect(self, url):
self.send_response(302)
self.send_header("Location", url)
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Headers", "User-Agent, X-Loogle-Client")
self.end_headers()
def returnJSON(self, data):
self.send_response(200)
self.send_header("Content-type", "application/json")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Headers", "User-Agent, X-Loogle-Client")
self.end_headers()
try:
self.wfile.write(bytes(json.dumps(data), "utf8"))
except BrokenPipeError:
pass
def returnIcon(self):
self.send_response(200)
self.send_header("Content-type", "image/png")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Headers", "User-Agent, X-Loogle-Client")
self.end_headers()
try:
self.wfile.write(icon)
except BrokenPipeError:
pass
def do_OPTIONS(self):
url = urllib.parse.urlparse(self.path)
if url.path == "/json":
self.send_response(200)
self.send_header("Content-type", "application/json")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Methods", "GET")
self.send_header("Access-Control-Allow-Headers", "User-Agent, X-Loogle-Client")
self.end_headers()
else:
self.return404()
def do_POST(self):
try:
url = urllib.parse.urlparse(self.path)
if url.path != "/zulipbot":
self.return404()
return
if self.headers.get_content_type() != 'application/json':
self.send_response(400)
self.end_headers()
return
m_client.labels("zulip").inc()
length = int(self.headers.get('content-length'))
message = json.loads(self.rfile.read(length))
m = re.search('@\*\*loogle\*\*[:,\?]?\s*(.*)$', message['data'], flags = re.MULTILINE)
if m:
query = m.group(1)
else:
query = message['data'].split('\n', 1)[0]
result = loogle.query(query)
if "error" in result:
if "\n" in result['error']:
reply = f"❗\n```\n{result['error']}\n```"
else:
reply = f"❗ {result['error']}"
if "suggestions" in result:
suggs = result["suggestions"]
reply += "\n"
if len(suggs) == 1:
reply += f"Did you mean {zulQuery(suggs[0])}?"
elif len(suggs) == 2:
reply += f"Did you mean {zulQuery(suggs[0])} or {zulQuery(suggs[1])}?"
else:
reply += f"Did you mean {zulQuery(suggs[0])}, {zulQuery(suggs[1])}, or [something else]({querylink(query)})?"
else:
hits = result["hits"]
if len(hits) == 0:
reply = f"🤷 nothing found"
elif len(hits) == 1:
reply = f"🔍 {zulHit(hits[0])}"
elif len(hits) == 2:
reply = f"🔍 {zulHit(hits[0])}, {zulHit(hits[1])}"
else:
n = result["count"] - 2
reply = f"🔍 {zulHit(hits[0])}, {zulHit(hits[1])}, and [{n} more]({querylink(query)})"
self.returnJSON({ "content": reply })
except BrokenPipeError:
# browsers seem to like to close this early
pass
def do_GET(self):
try:
query = ""
result = {}
url = urllib.parse.urlparse(self.path)
want_json = False
if url.path == "/loogle.png":
self.returnIcon()
return
if url.path == "/json":
want_json = True
elif url.path == "/metrics":
return super(MyHandler, self).do_GET()
elif url.path != "/":
self.return404()
return
url_query = url.query
params = urllib.parse.parse_qs(url_query)
if "q" in params and len(params["q"]) == 1:
if want_json:
if "lean4/" in self.headers.get("x-loogle-client", ""):
m_client.labels("vscode-lean4").inc()
elif "vscode" in self.headers["user-agent"]:
m_client.labels("vscode-loogle").inc()
elif "lean.nvim" in self.headers["user-agent"]:
m_client.labels("nvim").inc()
elif "lean+nvim" in self.headers["user-agent"]:
m_client.labels("nvim").inc()
else:
m_client.labels("json").inc()
else:
m_client.labels("web").inc()
query = params["q"][0].strip().removeprefix("#find ").strip()
if query:
if "\n" in query:
self.return400()
return
result = loogle.query(query)
if "lucky" in params:
if "hits" in result and len(result["hits"]) >= 1:
self.returnRedirect(doclink(result["hits"][0]))
return
if want_json:
self.returnJSON(result)
return
self.send_response(200)
self.send_header("Content-type", "text/html")
self.end_headers()
self.wfile.write(bytes("""
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="https://unpkg.com/chota@0.9.2/dist/chota.min.css"
integrity="sha384-A2UBIkgVTcNWgv+snhw7PKvU/L9N0JqHwgwDwyNcbsLiVhGG5KAuR64N4wuDYd99"
crossorigin="anonymous">
<link rel="modulepreload"
href="https://cdn.skypack.dev/-/@leanprover/unicode-input@v0.1.0-8CqsXR89dtD7hIU0c6wN/dist=es2020,mode=imports,min/optimized/@leanprover/unicode-input.js"
integrity="sha384-IR290YsDJ1+Rzd4fgZM4K+v1E2kG2NzQ3XYgGhSxE4cNodMg0JQ9BWn/0JMgk5Xa"
crossorigin="anonymous">
<link rel="modulepreload"
href="https://cdn.skypack.dev/-/@leanprover/unicode-input-component@v0.1.0-cAcOWoqAnOWevp4vHscs/dist=es2020,mode=imports,min/optimized/@leanprover/unicode-input-component.js"
integrity="sha384-yX1xThTPuhw06x65fHJAV8FLLmaKxiyeKkBTGsI5R1dHRQmHbXU0ylBBu2+56Bc/"
crossorigin="anonymous">
<link rel="modulepreload"
href="https://cdn.skypack.dev/pin/@leanprover/unicode-input-component@v0.1.0-cAcOWoqAnOWevp4vHscs/mode=imports,min/optimized/@leanprover/unicode-input-component.js"
integrity="sha384-3jdol3AWL3guud0hEWfo7ysqRxI6grINH5ElwPuStNcMb887NNz08TqkGNgy+2q6"
crossorigin="anonymous">
<style>
@import url('https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.051/juliamono.css');
:root {
--font-family-mono: 'JuliaMono', monospace;
}
/* Browser fix for unicode editing */
.textinput { white-space: -moz-pre-space; }
/* Copied from chota for textinput */
.textinput {
font-family: inherit;
padding: 0.8rem 1rem;
border-radius: 4px;
border: 1px solid var(--color-lightGrey);
font-size: 1em;
-webkit-transition: all 0.2s ease;
transition: all 0.2s ease;
display: block;
width: 100%;
}
.textinput:focus {
outline: none;
border-color: var(--color-primary);
box-shadow: 0 0 1px var(--color-primary);
}
</style>
<link rel="icon" type="image/png" href="loogle.png" />
<title>Loogle!</title>
<body autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false">
<main class="container">
<section>
<h1><a href="." style="color:#333;">Loogle!</a></h1>
""", "utf-8"))
self.wfile.write(bytes(f"""
<form method="GET" id="queryform">
<div class="grouped">
<input id="hiddenquery" type="hidden" name="q" value=""/>
<div class="textinput" id="query" name="q" contenteditable="true" autofocus="true">{html.escape(query)}</div>
<button type="submit" id="submit">#find</button>
<button type="submit" name="lucky" value="yes" title="Directly jump to the documentation of the first hit.">#lucky</button>
</div>
</form>
</section>
""", "utf-8"))
if "error" in result:
self.wfile.write(bytes(f"""
<h2>Error</h2>
<pre>{html.escape(result['error'])}</pre>
""", "utf-8"))
if "header" in result:
self.wfile.write(b"""
<h2>Result</h2>
""")
self.wfile.write(bytes(f"""
<p>{html.escape(result['header'])}</p>
""", "utf-8"))
if "hits" in result:
self.wfile.write(bytes(f"""
<ul>
""", "utf-8"))
for hit in result["hits"]:
name = hit["name"]
mod = hit["module"]
type = hit["type"]
self.wfile.write(bytes(f"""
<li><a href="{doclink(hit)}">{html.escape(name)}</a> <small>{html.escape(mod)}</small><br><tt>{html.escape(type)}</tt></li>
""", "utf-8"))
self.wfile.write(b"""
</ul>
""")
if "suggestions" in result:
self.wfile.write(b'<h2>Did you maybe mean</h2><ul>')
for sugg in result["suggestions"]:
link = locallink(sugg)
self.wfile.write(bytes(f'<li>🔍 <a href={link}><code>{html.escape(sugg)}</code></a></li>', "utf-8"))
self.wfile.write(b'</ul>')
self.wfile.write(blurb)
self.wfile.write(bytes(f"""
<p><small>This is Loogle revision <a href="https://github.com/nomeata/loogle/commit/{rev1}"><code>{rev1[:7]}</code></a> serving mathlib revision <a href="https://github.com/leanprover-community/mathlib4/commit/{rev2}"><code>{rev2[:7]}</code></a></small></p>
""", "utf-8"))
self.wfile.write(b"""
</main>
<script type="module">
import { InputAbbreviationRewriter } from "https://cdn.skypack.dev/pin/@leanprover/unicode-input-component@v0.1.0-cAcOWoqAnOWevp4vHscs/mode=imports,min/optimized/@leanprover/unicode-input-component.js";
const queryInput = document.getElementById('query');
const hiddenInput = document.getElementById('hiddenquery');
const form = document.getElementById('queryform');
const submitButton = document.getElementById('submit');
const rewriter = new InputAbbreviationRewriter(
{ abbreviationCharacter: "\\\\",
customTranslations: [],
eagerReplacementEnabled: true },
queryInput,
)
queryInput.addEventListener('keydown', event => {
if (event.key === 'Enter') {
event.preventDefault();
submitButton.click();
}
})
form.addEventListener('submit', event => {
hiddenInput.value = queryInput.innerText;
})
</script>
</body>
</html>
""")
except BrokenPipeError:
# browsers seem to like to close this early
pass
if __name__ == "__main__":
webServer = HTTPServer((hostName, serverPort), MyHandler)
print("Server started http://%s:%s" % (hostName, serverPort), flush=True)
try:
webServer.serve_forever()
except KeyboardInterrupt:
pass
webServer.server_close()
print("Server stopped.")