#!/usr/bin/env python3 import requests import argparse import jwt import sys import json import time from collections import namedtuple def get_key_and_app_from_aws(): import boto3 secret_name = "clickhouse_github_secret_key" session = boto3.session.Session() client = session.client( service_name="secretsmanager", ) get_secret_value_response = client.get_secret_value(SecretId=secret_name) data = json.loads(get_secret_value_response["SecretString"]) return data["clickhouse-app-key"], int(data["clickhouse-app-id"]) def get_installation_id(jwt_token): headers = { "Authorization": f"Bearer {jwt_token}", "Accept": "application/vnd.github.v3+json", } response = requests.get("https://api.github.com/app/installations", headers=headers) response.raise_for_status() data = response.json() return data[0]["id"] def get_access_token(jwt_token, installation_id): headers = { "Authorization": f"Bearer {jwt_token}", "Accept": "application/vnd.github.v3+json", } response = requests.post( f"https://api.github.com/app/installations/{installation_id}/access_tokens", headers=headers, ) response.raise_for_status() data = response.json() return data["token"] RunnerDescription = namedtuple( "RunnerDescription", ["id", "name", "tags", "offline", "busy"] ) def list_runners(access_token): headers = { "Authorization": f"token {access_token}", "Accept": "application/vnd.github.v3+json", } response = requests.get( "https://api.github.com/orgs/ClickHouse/actions/runners?per_page=100", headers=headers, ) response.raise_for_status() data = response.json() total_runners = data["total_count"] runners = data["runners"] total_pages = int(total_runners / 100 + 1) for i in range(2, total_pages + 1): response = requests.get( f"https://api.github.com/orgs/ClickHouse/actions/runners?page={i}&per_page=100", headers=headers, ) response.raise_for_status() data = response.json() runners += data["runners"] print("Total runners", len(runners)) result = [] for runner in runners: tags = [tag["name"] for tag in runner["labels"]] desc = RunnerDescription( id=runner["id"], name=runner["name"], tags=tags, offline=runner["status"] == "offline", busy=runner["busy"], ) result.append(desc) return result def push_metrics_to_cloudwatch(listed_runners, namespace): import boto3 client = boto3.client("cloudwatch") metrics_data = [] busy_runners = sum(1 for runner in listed_runners if runner.busy) metrics_data.append( { "MetricName": "BusyRunners", "Value": busy_runners, "Unit": "Count", } ) total_active_runners = sum(1 for runner in listed_runners if not runner.offline) metrics_data.append( { "MetricName": "ActiveRunners", "Value": total_active_runners, "Unit": "Count", } ) total_runners = len(listed_runners) metrics_data.append( { "MetricName": "TotalRunners", "Value": total_runners, "Unit": "Count", } ) if total_active_runners == 0: busy_ratio = 100 else: busy_ratio = busy_runners / total_active_runners * 100 metrics_data.append( { "MetricName": "BusyRunnersRatio", "Value": busy_ratio, "Unit": "Percent", } ) client.put_metric_data(Namespace="RunnersMetrics", MetricData=metrics_data) def how_many_instances_to_kill(event_data): data_array = event_data["CapacityToTerminate"] to_kill_by_zone = {} for av_zone in data_array: zone_name = av_zone["AvailabilityZone"] to_kill = av_zone["Capacity"] if zone_name not in to_kill_by_zone: to_kill_by_zone[zone_name] = 0 to_kill_by_zone[zone_name] += to_kill return to_kill_by_zone def get_candidates_to_be_killed(event_data): data_array = event_data["Instances"] instances_by_zone = {} for instance in data_array: zone_name = instance["AvailabilityZone"] instance_id = instance["InstanceId"] if zone_name not in instances_by_zone: instances_by_zone[zone_name] = [] instances_by_zone[zone_name].append(instance_id) return instances_by_zone def delete_runner(access_token, runner): headers = { "Authorization": f"token {access_token}", "Accept": "application/vnd.github.v3+json", } response = requests.delete( f"https://api.github.com/orgs/ClickHouse/actions/runners/{runner.id}", headers=headers, ) response.raise_for_status() print( f"Response code deleting {runner.name} with id {runner.id} is {response.status_code}" ) return response.status_code == 204 def main(github_secret_key, github_app_id, event): print("Got event", json.dumps(event, sort_keys=True, indent=4)) to_kill_by_zone = how_many_instances_to_kill(event) instances_by_zone = get_candidates_to_be_killed(event) payload = { "iat": int(time.time()) - 60, "exp": int(time.time()) + (10 * 60), "iss": github_app_id, } encoded_jwt = jwt.encode(payload, github_secret_key, algorithm="RS256") installation_id = get_installation_id(encoded_jwt) access_token = get_access_token(encoded_jwt, installation_id) runners = list_runners(access_token) to_delete_runners = [] instances_to_kill = [] for zone in to_kill_by_zone: num_to_kill = to_kill_by_zone[zone] candidates = instances_by_zone[zone] if num_to_kill > len(candidates): raise Exception( f"Required to kill {num_to_kill}, but have only {len(candidates)} candidates in AV {zone}" ) delete_for_av = [] for candidate in candidates: if candidate not in set([runner.name for runner in runners]): print( f"Candidate {candidate} was not in runners list, simply delete it" ) instances_to_kill.append(candidate) for candidate in candidates: if len(delete_for_av) + len(instances_to_kill) == num_to_kill: break if candidate in instances_to_kill: continue for runner in runners: if runner.name == candidate: if not runner.busy: print( f"Runner {runner.name} is not busy and can be deleted from AV {zone}" ) delete_for_av.append(runner) else: print(f"Runner {runner.name} is busy, not going to delete it") break if len(delete_for_av) < num_to_kill: print( f"Checked all candidates for av {zone}, get to delete {len(delete_for_av)}, but still cannot get required {num_to_kill}" ) to_delete_runners += delete_for_av print("Got instances to kill: ", ", ".join(instances_to_kill)) print( "Going to delete runners:", ", ".join([runner.name for runner in to_delete_runners]), ) for runner in to_delete_runners: if delete_runner(access_token, runner): print( f"Runner with name {runner.name} and id {runner.id} successfuly deleted from github" ) instances_to_kill.append(runner.name) else: print(f"Cannot delete {runner.name} from github") ## push metrics # runners = list_runners(access_token) # push_metrics_to_cloudwatch(runners, 'RunnersMetrics') response = {"InstanceIDs": instances_to_kill} print(response) return response def handler(event, context): private_key, app_id = get_key_and_app_from_aws() return main(private_key, app_id, event) if __name__ == "__main__": parser = argparse.ArgumentParser(description="Get list of runners and their states") parser.add_argument( "-p", "--private-key-path", help="Path to file with private key" ) parser.add_argument("-k", "--private-key", help="Private key") parser.add_argument( "-a", "--app-id", type=int, help="GitHub application ID", required=True ) args = parser.parse_args() if not args.private_key_path and not args.private_key: print( "Either --private-key-path or --private-key must be specified", file=sys.stderr, ) if args.private_key_path and args.private_key: print( "Either --private-key-path or --private-key must be specified", file=sys.stderr, ) if args.private_key: private_key = args.private_key else: with open(args.private_key_path, "r") as key_file: private_key = key_file.read() sample_event = { "AutoScalingGroupARN": "arn:aws:autoscaling:us-east-1::autoScalingGroup:d4738357-2d40-4038-ae7e-b00ae0227003:autoScalingGroupName/my-asg", "AutoScalingGroupName": "my-asg", "CapacityToTerminate": [ { "AvailabilityZone": "us-east-1b", "Capacity": 1, "InstanceMarketOption": "OnDemand", }, { "AvailabilityZone": "us-east-1c", "Capacity": 2, "InstanceMarketOption": "OnDemand", }, ], "Instances": [ { "AvailabilityZone": "us-east-1b", "InstanceId": "i-08d0b3c1a137e02a5", "InstanceType": "t2.nano", "InstanceMarketOption": "OnDemand", }, { "AvailabilityZone": "us-east-1c", "InstanceId": "ip-172-31-45-253.eu-west-1.compute.internal", "InstanceType": "t2.nano", "InstanceMarketOption": "OnDemand", }, { "AvailabilityZone": "us-east-1c", "InstanceId": "ip-172-31-27-227.eu-west-1.compute.internal", "InstanceType": "t2.nano", "InstanceMarketOption": "OnDemand", }, { "AvailabilityZone": "us-east-1c", "InstanceId": "ip-172-31-45-253.eu-west-1.compute.internal", "InstanceType": "t2.nano", "InstanceMarketOption": "OnDemand", }, ], "Cause": "SCALE_IN", } main(private_key, args.app_id, sample_event)