Feat: round robin keys (#385)

Author: S1ro1

src/libkernelbot/launchers/github.py

@@ -5,7 +5,9 @@
 import io
 import json
 import math
+import os
 import pprint
+import threading
 import uuid
 import zipfile
 import zlib
@@ -58,9 +60,35 @@ class GitHubLauncher(Launcher):
     def __init__(self, repo: str, token: str, branch: str):
         super().__init__(name="GitHub", gpus=GitHubGPU)
         self.repo = repo
-        self.token = token
+        self.tokens = self._load_github_tokens(token)
+        self._token_lock = threading.Lock()
+        self._token_idx = 0
         self.branch = branch
 
+    @staticmethod
+    def _load_github_tokens(fallback_token: str) -> list[str]:
+        primary = (os.getenv("GITHUB_TOKEN") or fallback_token).strip()
+        backup = (os.getenv("GITHUB_TOKEN_BACKUP") or "").strip()
+
+        tokens: list[str] = []
+        for t in (primary, backup):
+            if t and t not in tokens:
+                tokens.append(t)
+
+        if not tokens:
+            raise KernelBotError(
+                "No GitHub tokens configured. Set GITHUB_TOKEN "
+                "(and optionally GITHUB_TOKEN_BACKUP)."
+            )
+
+        return tokens
+
+    def _next_token(self) -> str:
+        with self._token_lock:
+            token = self.tokens[self._token_idx]
+            self._token_idx = (self._token_idx + 1) % len(self.tokens)
+            return token
+
     async def run_submission(  # noqa: C901
         self, config: dict, gpu_type: GPU, status: RunProgressReporter
     ) -> FullResult:
@@ -89,7 +117,7 @@ async def run_submission(  # noqa: C901
         lang_name = {"py": "Python", "cu": "CUDA"}[lang]
 
         logger.info(f"Attempting to trigger GitHub action for {lang_name} on {selected_workflow}")
-        run = GitHubRun(self.repo, self.token, self.branch, selected_workflow)
+        run = GitHubRun(self.repo, self._next_token(), self.branch, selected_workflow)
         logger.info(f"Successfully created GitHub run: {run.run_id}")
 
         payload = base64.b64encode(zlib.compress(json.dumps(config).encode("utf-8"))).decode(
@@ -176,7 +204,7 @@ class GitHubArtifact:
     public_download_url: str
 
 
-_WORKFLOW_FILE_CACHE: dict[str, Workflow] = {}
+_WORKFLOW_FILE_CACHE: dict[tuple[str, str], Workflow] = {}
 
 
 def patched_create_dispatch(
@@ -248,12 +276,13 @@ def elapsed_time(self):
         return datetime.datetime.now(datetime.timezone.utc) - self.start_time
 
     async def get_workflow(self) -> Workflow:
-        if self.workflow_file in _WORKFLOW_FILE_CACHE:
+        cache_key = (self.workflow_file, self.token)
+        if cache_key in _WORKFLOW_FILE_CACHE:
             logger.info(f"Returning cached workflow {self.workflow_file}")
-            return _WORKFLOW_FILE_CACHE[self.workflow_file]
+            return _WORKFLOW_FILE_CACHE[cache_key]
         logger.info(f"Fetching workflow {self.workflow_file} from GitHub")
         workflow = self.repo.get_workflow(self.workflow_file)
-        _WORKFLOW_FILE_CACHE[self.workflow_file] = workflow
+        _WORKFLOW_FILE_CACHE[cache_key] = workflow
         return workflow
 
     async def trigger(self, inputs: dict) -> bool: