Rename weechat_http to http

1 files changed, 107 insertions, 0 deletions

diff --git a/slack/http.py b/slack/http.py
new file mode 100644
index 0000000..ba30339
--- /dev/null
+++ b/slack/http.py
@@ -0,0 +1,107 @@
+from __future__ import annotations
+
+import os
+import resource
+from io import StringIO
+from typing import Dict
+
+import weechat
+
+from .log import LogLevel, log
+from .task import FutureProcess, sleep, weechat_task_cb
+from .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