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github_api.py
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199 lines (170 loc) · 6.44 KB
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import logging
import os
import threading
import time
from datetime import datetime
from functools import partial
from typing import List
import github
from github import Github, RateLimitExceededException
class RateLimiter:
"""
Rate Limiter for the Github API
"""
def __init__(self, requests_limit: int, reset_seconds: int):
self.requests = 0
self.requests_limit = requests_limit
self.reset_seconds = reset_seconds
self.first_request = datetime.now()
self.lock = threading.Lock()
def request(self, fn, *args, **kwargs):
with self.lock:
time_after_reset = (datetime.now() - self.first_request).total_seconds()
retries = 3
if self.requests == 0:
self.first_request = datetime.now()
elif time_after_reset > self.reset_seconds:
self.requests = 0
self.first_request = datetime.now()
if self.requests == self.requests_limit:
time.sleep(self.reset_seconds - time_after_reset)
self.requests = 0
self.requests += 1
while retries > 0:
try:
return fn(*args, **kwargs)
except RateLimitExceededException as exc:
with self.lock:
logging.warning(f"Github Rate Limit Exceeded: {exc.headers}")
reset_time = datetime.fromtimestamp(
int(exc.headers["x-ratelimit-reset"])
)
retry_after = (reset_time - datetime.now()).total_seconds() + 1
retry_after = max(
retry_after, 0
) # In case we hit a negative total_seconds
time.sleep(retry_after)
retries -= 1
if retries == 0:
raise exc
def update_requests(self, requests: int):
with self.lock:
self.requests = requests
class SearchRateLimiter(RateLimiter):
"""
Rate Limiter for the Github search API. The search API has different rate limits
than the core API.
"""
def __init__(self):
super().__init__(
# The real limit is 30, but we try to avoid it
requests_limit=29,
reset_seconds=60,
)
class CoreRateLimiter(RateLimiter):
"""
Rate Limiter for the Github core API.
"""
def __init__(self):
super().__init__(
# The real limit is 5000, but we try to avoid it
requests_limit=4995,
reset_seconds=3600,
)
class GithubToken:
__TOKENS: List["GithubToken"] = None
__TOKENS_LOCK: threading.Lock = threading.Lock()
__CURRENT_TOKEN = 0
__OFFSET = 200
__UPDATE_RATE_INTERVAL = 5 # in seconds
def __init__(self, token: str):
self.lock_rate: threading.Lock = threading.Lock()
self.last_update: float = 0
self.token: str = token
self.search_rate_limiter = SearchRateLimiter()
self.core_rate_limiter = CoreRateLimiter()
GithubToken.__TOKENS.append(self)
self.github = GithubAPI(token=self)
def update_rate_limit(self):
with self.lock_rate:
if time.time() - self.last_update > GithubToken.__UPDATE_RATE_INTERVAL:
rate_limit = self.github.get_rate_limit()
self.search_rate_limiter.update_requests(
rate_limit.search.limit - rate_limit.search.remaining
)
self.core_rate_limiter.update_requests(
rate_limit.core.limit - rate_limit.core.remaining
)
@staticmethod
def has_tokens() -> bool:
return "GITHUB_ACCESS_TOKEN" in os.environ
@staticmethod
def init_tokens():
if GithubToken.has_tokens():
GithubToken.__TOKENS = []
tokens = os.environ["GITHUB_ACCESS_TOKEN"].split(",")
for token in tokens:
GithubToken(token)
else:
logging.error("No environment variable GITHUB_ACCESS_TOKEN provided.")
exit(1)
@staticmethod
def __wait_for_tokens():
if len(GithubToken.__TOKENS) == 0:
return
soonest_reset = GithubToken.__TOKENS[0].github.get_rate_limit().core.reset
for token in GithubToken.__TOKENS[1:]:
reset = token.github.get_rate_limit().core.reset
if reset < soonest_reset:
soonest_reset = reset
time.sleep((datetime.now() - soonest_reset).total_seconds())
@staticmethod
def get_token() -> "GithubToken":
with GithubToken.__TOKENS_LOCK:
if GithubToken.__TOKENS is None:
GithubToken.init_tokens()
len_tokens = (
0 if not GithubToken.has_tokens() else len(GithubToken.__TOKENS)
)
if len_tokens == 0:
return None
next_tokens = (
GithubToken.__TOKENS[GithubToken.__CURRENT_TOKEN :]
+ GithubToken.__TOKENS[: GithubToken.__CURRENT_TOKEN]
)
for token in next_tokens:
GithubToken.__CURRENT_TOKEN = (
GithubToken.__CURRENT_TOKEN + 1
) % len_tokens
if (
token.core_rate_limiter.requests_limit
- token.core_rate_limiter.requests
>= GithubToken.__OFFSET
):
return token
GithubToken.__wait_for_tokens()
class GithubAPI(Github):
def __init__(self, *args, token: GithubToken = None, **kwargs):
if "auth" not in kwargs:
self.token = GithubToken.get_token() if token is None else token
if self.token is not None:
kwargs["auth"] = github.Auth.Token(self.token.token)
else:
super().__init__(*args, **kwargs)
return
super().__init__(*args, **kwargs)
for attr, val in Github.__dict__.items():
if attr.startswith("_") or not callable(val):
continue
if attr.startswith("search"):
setattr(
self,
attr,
partial(self.token.search_rate_limiter.request, partial(val, self)),
)
else:
setattr(
self,
attr,
partial(self.token.core_rate_limiter.request, partial(val, self)),
)