import os
import resource
from io import StringIO
from typing import Dict
import weechat
from slack.log import LogLevel, log
from slack.task import FutureProcess, sleep, weechat_task_cb
from slack.util import get_callback_name
class HttpError(Exception):
def __init__(self, url: str, return_code: int, http_status: int, error: str):
super().__init__()
self.url = url
self.return_code = return_code
self.http_status = http_status
self.error = error
def available_file_descriptors():
num_current_file_descriptors = len(os.listdir("/proc/self/fd/"))
max_file_descriptors = min(resource.getrlimit(resource.RLIMIT_NOFILE))
return max_file_descriptors - num_current_file_descriptors
async def hook_process_hashtable(command: str, options: Dict[str, str], timeout: int):
future = FutureProcess()
log(
LogLevel.DEBUG,
f"hook_process_hashtable calling ({future.id}): command: {command}",
)
while available_file_descriptors() < 10:
await sleep(10)
weechat.hook_process_hashtable(
command, options, timeout, get_callback_name(weechat_task_cb), future.id
)
stdout = StringIO()
stderr = StringIO()
return_code = -1
while return_code == -1:
_, return_code, out, err = await future
log(
LogLevel.TRACE,
f"hook_process_hashtable intermediary response ({future.id}): command: {command}",
)
stdout.write(out)
stderr.write(err)
out = stdout.getvalue()
err = stderr.getvalue()
log(
LogLevel.DEBUG,
f"hook_process_hashtable response ({future.id}): command: {command}, "
f"return_code: {return_code}, response length: {len(out)}"
+ (f", error: {err}" if err else ""),
)
return command, return_code, out, err
async def http_request(
url: str, options: Dict[str, str], timeout: int, max_retries: int = 5
) -> str:
options["header"] = "1"
_, return_code, out, err = await hook_process_hashtable(
f"url:{url}", options, timeout
)
if return_code != 0 or err:
if max_retries > 0:
log(
LogLevel.INFO,
f"HTTP error, retrying (max {max_retries} times): "
f"return_code: {return_code}, error: {err}, url: {url}",
)
await sleep(1000)
return await http_request(url, options, timeout, max_retries - 1)
raise HttpError(url, return_code, 0, err)
headers_end_index = out.index("\r\n\r\n")
headers = out[:headers_end_index].split("\r\n")
http_status = int(headers[0].split(" ")[1])
if http_status == 429:
for header in headers[1:]:
name, value = header.split(":", 1)
if name.lower() == "retry-after":
retry_after = int(value.strip())
log(
LogLevel.INFO,
f"HTTP ratelimit, retrying in {retry_after} seconds, url: {url}",
)
await sleep(retry_after * 1000)
return await http_request(url, options, timeout)
body = out[headers_end_index + 4 :]
if http_status >= 400:
raise HttpError(url, return_code, http_status, body)
return body
