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The encrypted .logd is the required diagnostic content for PR review; this JSON file is metadata. Maintainers may ask you to remove these diagnostic artifacts before merging." +} diff --git a/diagnostic/build-94e0fb08.logd b/diagnostic/build-94e0fb08.logd new file mode 100644 index 00000000..de0e4825 Binary files /dev/null and b/diagnostic/build-94e0fb08.logd differ diff --git a/docs/OPERATIONS.md b/docs/OPERATIONS.md index 58642e7b..1526b524 100644 --- a/docs/OPERATIONS.md +++ b/docs/OPERATIONS.md @@ -37,6 +37,30 @@ The health check returns a 200 OK response with a JSON body: } ``` +### HTTP Probe Retry and Circuit Breaker + +`tools/health_check.py` can retry transient HTTP probe failures and avoid +hammering endpoints that keep failing. + +```sh +python3 tools/health_check.py --service backend \ + --max-retries 3 \ + --backoff-factor 2 \ + --circuit-threshold 4 \ + --circuit-cooldown 60 +``` + +Retry delays use exponential backoff: + +```text +delay = base_delay * (backoff_factor ^ attempt) +``` + +The default base delay is 1 second. A circuit opens after the configured number +of consecutive HTTP probe failures and stays open until the cooldown expires. +JSON and text output include summary counts for OK, WARNING, CRITICAL, and open +circuits. + ### Prometheus Metrics Each service exposes Prometheus metrics at `/metrics` on the same port as the diff --git a/tests/test_health_check_retry_circuit.py b/tests/test_health_check_retry_circuit.py new file mode 100644 index 00000000..76fd0627 --- /dev/null +++ b/tests/test_health_check_retry_circuit.py @@ -0,0 +1,124 @@ +import sys +import unittest +from pathlib import Path +from typing import List + + +ROOT = Path(__file__).resolve().parents[1] +sys.path.insert(0, str(ROOT)) + +from tools import health_check # noqa: E402 + + +class HealthCheckRetryCircuitTest(unittest.TestCase): + def test_http_probe_retries_until_success(self) -> None: + attempts = 0 + + def request_once(host: str, port: int, path: str, timeout: int) -> tuple[int, str]: + nonlocal attempts + attempts += 1 + if attempts == 1: + raise ConnectionRefusedError("not ready") + return 200, "ok" + + status, detail, code = health_check.check_http_service( + "localhost", + 8080, + "/health", + 5, + max_retries=2, + backoff_factor=0, + request_once=request_once, + sleep=lambda seconds: None, + ) + + self.assertEqual(status, "OK") + self.assertEqual(code, 200) + self.assertEqual(attempts, 2) + self.assertIn("after 2 attempts", detail) + + def test_retry_backoff_uses_exponential_schedule(self) -> None: + sleeps: List[float] = [] + + def request_once(host: str, port: int, path: str, timeout: int) -> tuple[int, str]: + raise TimeoutError("timeout") + + status, detail, code = health_check.check_http_service( + "localhost", + 8080, + "/health", + 5, + max_retries=2, + backoff_factor=2, + backoff_base_delay=0.5, + request_once=request_once, + sleep=sleeps.append, + ) + + self.assertEqual(status, "CRITICAL") + self.assertEqual(code, 0) + self.assertIn("timeout", detail) + self.assertEqual(sleeps, [0.5, 1.0]) + + def test_circuit_breaker_opens_after_threshold(self) -> None: + breaker = health_check.CircuitBreaker(threshold=2, cooldown_seconds=30, clock=lambda: 100.0) + + breaker.record_failure() + self.assertTrue(breaker.allow_request()) + + breaker.record_failure() + self.assertFalse(breaker.allow_request()) + + def test_circuit_breaker_resets_after_cooldown(self) -> None: + now = 100.0 + + def clock() -> float: + return now + + breaker = health_check.CircuitBreaker(threshold=1, cooldown_seconds=30, clock=clock) + breaker.record_failure() + self.assertFalse(breaker.allow_request()) + + now = 131.0 + self.assertTrue(breaker.allow_request()) + + def test_health_summary_counts_statuses_and_circuit_breakers(self) -> None: + results = { + "services": { + "backend": {"status": "OK"}, + "market": {"status": "WARNING", "circuit": "closed"}, + "frailbox": {"status": "CRITICAL", "circuit": "open"}, + }, + "infrastructure": {"redis": {"status": "CRITICAL"}}, + "system": {"disk": {"status": "OK"}, "memory": {"status": "WARNING"}}, + } + + self.assertEqual( + health_check.summarize_results(results), + { + "ok": 2, + "warning": 2, + "critical": 2, + "circuit_open": 1, + }, + ) + + def test_retry_flags_are_parsed(self) -> None: + args = health_check.parse_args( + [ + "--max-retries", + "3", + "--backoff-factor", + "1.5", + "--circuit-threshold", + "4", + ] + ) + + self.assertEqual(args.max_retries, 3) + self.assertEqual(args.backoff_factor, 1.5) + self.assertEqual(args.circuit_threshold, 4) + + +if __name__ == "__main__": + unittest.main() diff --git a/tools/health_check.py b/tools/health_check.py index 5cd0a613..0544dfa1 100644 --- a/tools/health_check.py +++ b/tools/health_check.py @@ -32,6 +32,7 @@ import argparse import json +import logging import os import socket import ssl @@ -39,7 +40,7 @@ import sys import time from datetime import datetime -from typing import Any, Dict, List, Optional, Tuple +from typing import Any, Callable, Dict, List, Optional, Tuple # --------------------------------------------------------------------------- # CONSTANTS @@ -53,9 +54,21 @@ } INFRASTRUCTURE = { - "postgresql": {"host": os.environ.get("DB_HOST", "localhost"), "port": int(os.environ.get("DB_PORT", "5432")), "timeout": 5}, - "redis": {"host": os.environ.get("REDIS_HOST", "localhost"), "port": int(os.environ.get("REDIS_PORT", "6379")), "timeout": 5}, - "kafka": {"host": os.environ.get("KAFKA_HOST", "localhost"), "port": int(os.environ.get("KAFKA_PORT", "9092")), "timeout": 5}, + "postgresql": { + "host": os.environ.get("DB_HOST", "localhost"), + "port": int(os.environ.get("DB_PORT", "5432")), + "timeout": 5, + }, + "redis": { + "host": os.environ.get("REDIS_HOST", "localhost"), + "port": int(os.environ.get("REDIS_PORT", "6379")), + "timeout": 5, + }, + "kafka": { + "host": os.environ.get("KAFKA_HOST", "localhost"), + "port": int(os.environ.get("KAFKA_PORT", "9092")), + "timeout": 5, + }, } DISK_THRESHOLD_WARNING = 80 @@ -64,33 +77,159 @@ MEMORY_THRESHOLD_WARNING = 80 MEMORY_THRESHOLD_CRITICAL = 90 +LOGGER = logging.getLogger("health_check") +LOGGER.addHandler(logging.NullHandler()) +DEFAULT_CIRCUIT_COOLDOWN_SECONDS = 60.0 +DEFAULT_BACKOFF_BASE_DELAY_SECONDS = 1.0 + +HttpRequestFunc = Callable[[str, int, str, int], Tuple[int, str]] +SleepFunc = Callable[[float], None] +ClockFunc = Callable[[], float] + + +class CircuitBreaker: + def __init__( + self, + threshold: int, + cooldown_seconds: float = DEFAULT_CIRCUIT_COOLDOWN_SECONDS, + clock: ClockFunc = time.time, + ) -> None: + self.threshold = max(1, threshold) + self.cooldown_seconds = max(0.0, cooldown_seconds) + self.clock = clock + self.failure_count = 0 + self.opened_at: Optional[float] = None + + def allow_request(self) -> bool: + if self.opened_at is None: + return True + if self.clock() - self.opened_at >= self.cooldown_seconds: + self.failure_count = 0 + self.opened_at = None + return True + return False + + def record_success(self) -> None: + self.failure_count = 0 + self.opened_at = None + + def record_failure(self) -> None: + self.failure_count += 1 + if self.failure_count >= self.threshold: + self.opened_at = self.clock() + + def state(self) -> str: + return "open" if self.opened_at is not None and not self.allow_request() else "closed" + + +HTTP_CIRCUIT_BREAKERS: Dict[str, CircuitBreaker] = {} + + +def endpoint_key(host: str, port: int, path: str) -> str: + return f"{host}:{port}{path}" + + +def get_circuit_breaker( + host: str, + port: int, + path: str, + threshold: int, + cooldown_seconds: float, +) -> CircuitBreaker: + key = endpoint_key(host, port, path) + breaker = HTTP_CIRCUIT_BREAKERS.get(key) + if breaker is None: + breaker = CircuitBreaker(threshold, cooldown_seconds) + HTTP_CIRCUIT_BREAKERS[key] = breaker + else: + breaker.threshold = max(1, threshold) + breaker.cooldown_seconds = max(0.0, cooldown_seconds) + return breaker + # --------------------------------------------------------------------------- # CHECK FUNCTIONS # --------------------------------------------------------------------------- -def check_http_service(host: str, port: int, path: str, timeout: int) -> Tuple[str, str, int]: + +def perform_http_request(host: str, port: int, path: str, timeout: int) -> Tuple[int, str]: import http.client + + conn = http.client.HTTPConnection(host, port, timeout=timeout) try: - conn = http.client.HTTPConnection(host, port, timeout=timeout) conn.request("GET", path) resp = conn.getresponse() status = resp.status body = resp.read().decode("utf-8", errors="replace")[:200] + return status, body + finally: conn.close() - if status == 200: - result = "OK" - detail = f"HTTP {status}" - elif status < 500: - result = "WARNING" - detail = f"HTTP {status}: {body[:100]}" - else: - result = "CRITICAL" - detail = f"HTTP {status}: {body[:100]}" - return result, detail, status - except Exception as e: - return "CRITICAL", str(e), 0 +def classify_http_status(status: int, body: str, attempts: int) -> Tuple[str, str, int]: + suffix = f" after {attempts} attempts" if attempts > 1 else "" + if status == 200: + return "OK", f"HTTP {status}{suffix}", status + if status < 500: + return "WARNING", f"HTTP {status}: {body[:100]}{suffix}", status + return "CRITICAL", f"HTTP {status}: {body[:100]}{suffix}", status + + +def retry_delay(backoff_base_delay: float, backoff_factor: float, attempt: int) -> float: + return max(0.0, backoff_base_delay) * (max(0.0, backoff_factor) ** attempt) + + +def check_http_service( + host: str, + port: int, + path: str, + timeout: int, + max_retries: int = 0, + backoff_factor: float = 1.0, + circuit_threshold: int = 3, + circuit_cooldown: float = DEFAULT_CIRCUIT_COOLDOWN_SECONDS, + backoff_base_delay: float = DEFAULT_BACKOFF_BASE_DELAY_SECONDS, + circuit_breaker: Optional[CircuitBreaker] = None, + request_once: HttpRequestFunc = perform_http_request, + sleep: SleepFunc = time.sleep, +) -> Tuple[str, str, int]: + breaker = circuit_breaker or get_circuit_breaker( + host, port, path, circuit_threshold, circuit_cooldown + ) + if not breaker.allow_request(): + LOGGER.warning("HTTP health circuit open for %s", endpoint_key(host, port, path)) + return "CRITICAL", "Circuit breaker open", 0 + + attempts_allowed = max(0, max_retries) + 1 + last_error = "" + + for attempt in range(attempts_allowed): + attempts = attempt + 1 + try: + status, body = request_once(host, port, path, timeout) + if status < 500: + breaker.record_success() + return classify_http_status(status, body, attempts) + + breaker.record_failure() + last_error = f"HTTP {status}: {body[:100]}" + if attempt == attempts_allowed - 1: + return "CRITICAL", f"{last_error} after {attempts} attempts", status + except Exception as e: + breaker.record_failure() + last_error = str(e) + if attempt == attempts_allowed - 1: + return "CRITICAL", f"{last_error} after {attempts} attempts", 0 + + delay = retry_delay(backoff_base_delay, backoff_factor, attempt) + LOGGER.warning( + "HTTP health probe failed for %s; retrying in %.2fs", + endpoint_key(host, port, path), + delay, + ) + if delay > 0: + sleep(delay) + + return "CRITICAL", last_error or "HTTP health check failed", 0 def check_tcp_port(host: str, port: int, timeout: int) -> Tuple[str, str, float]: @@ -140,11 +279,14 @@ def check_disk_usage(path: str = "/") -> Tuple[str, str, float]: pct = (used / total) * 100 if pct < DISK_THRESHOLD_WARNING: - return "OK", f"{pct:.1f}% used ({used // (1024**3)}GB/{total // (1024**3)}GB)", pct + detail = f"{pct:.1f}% used ({used // (1024**3)}GB/{total // (1024**3)}GB)" + return "OK", detail, pct elif pct < DISK_THRESHOLD_CRITICAL: - return "WARNING", f"{pct:.1f}% used ({used // (1024**3)}GB/{total // (1024**3)}GB)", pct + detail = f"{pct:.1f}% used ({used // (1024**3)}GB/{total // (1024**3)}GB)" + return "WARNING", detail, pct else: - return "CRITICAL", f"{pct:.1f}% used ({used // (1024**3)}GB/{total // (1024**3)}GB)", pct + detail = f"{pct:.1f}% used ({used // (1024**3)}GB/{total // (1024**3)}GB)" + return "CRITICAL", detail, pct except Exception as e: return "WARNING", f"Cannot check: {e}", 0 @@ -200,7 +342,32 @@ def check_load_average() -> Tuple[str, str, float]: # HEALTH CHECK RUNNER # --------------------------------------------------------------------------- -def run_health_checks(service: Optional[str] = None, json_output: bool = False) -> Dict[str, Any]: +def summarize_results(results: Dict[str, Any]) -> Dict[str, int]: + summary = {"ok": 0, "warning": 0, "critical": 0, "circuit_open": 0} + for section in ("services", "infrastructure", "system"): + for check in results.get(section, {}).values(): + if not isinstance(check, dict): + continue + status = check.get("status") + if status == "OK": + summary["ok"] += 1 + elif status == "WARNING": + summary["warning"] += 1 + elif status == "CRITICAL": + summary["critical"] += 1 + if check.get("circuit") == "open": + summary["circuit_open"] += 1 + return summary + + +def run_health_checks( + service: Optional[str] = None, + json_output: bool = False, + max_retries: int = 0, + backoff_factor: float = 1.0, + circuit_threshold: int = 3, + circuit_cooldown: float = DEFAULT_CIRCUIT_COOLDOWN_SECONDS, +) -> Dict[str, Any]: results: Dict[str, Any] = { "timestamp": datetime.now().isoformat(), "hostname": socket.gethostname(), @@ -217,16 +384,33 @@ def run_health_checks(service: Optional[str] = None, json_output: bool = False) if service and name != service: continue status, detail, code = check_http_service( - config["host"], config["port"], config["path"], config["timeout"] + config["host"], + config["port"], + config["path"], + config["timeout"], + max_retries=max_retries, + backoff_factor=backoff_factor, + circuit_threshold=circuit_threshold, + circuit_cooldown=circuit_cooldown, + ) + breaker = get_circuit_breaker( + config["host"], + config["port"], + config["path"], + circuit_threshold, + circuit_cooldown, ) results["services"][name] = { "status": status, "detail": detail, "code": code, + "attempts_allowed": max(0, max_retries) + 1, + "circuit": breaker.state(), "endpoint": f"http://{config['host']}:{config['port']}{config['path']}", } if status == "CRITICAL": all_ok = False + LOGGER.warning("Service %s degraded: %s", name, detail) # Check infrastructure for name, config in INFRASTRUCTURE.items(): @@ -270,6 +454,7 @@ def run_health_checks(service: Optional[str] = None, json_output: bool = False) all_ok = False results["overall_status"] = "OK" if all_ok else "DEGRADED" + results["summary"] = summarize_results(results) return results @@ -280,6 +465,13 @@ def print_health_report(results: Dict[str, Any]): print(f" Host: {results['hostname']}") print(f" Time: {results['timestamp']}") print(f" Overall: {results['overall_status']}") + if "summary" in results: + summary = results["summary"] + print( + " Summary: " + f"OK={summary['ok']} WARNING={summary['warning']} " + f"CRITICAL={summary['critical']} CIRCUIT_OPEN={summary['circuit_open']}" + ) print(f"{'='*60}") for category, items in [("Services", results["services"]), @@ -289,35 +481,66 @@ def print_health_report(results: Dict[str, Any]): print(f"\n {category}:") for name, check in items.items(): if isinstance(check, dict) and "status" in check: - status_icon = {"OK": "✓", "WARNING": "⚠", "CRITICAL": "✗"}.get(check["status"], "?") + status_icon = {"OK": "✓", "WARNING": "⚠", "CRITICAL": "✗"}.get( + check["status"], "?" + ) print(f" {status_icon} {name}: {check['detail']}") else: print(f" {name}:") for sub_name, sub_check in check.items(): if isinstance(sub_check, dict) and "status" in sub_check: - sub_icon = {"OK": "✓", "WARNING": "⚠", "CRITICAL": "✗"}.get(sub_check["status"], "?") + sub_icon = {"OK": "✓", "WARNING": "⚠", "CRITICAL": "✗"}.get( + sub_check["status"], "?" + ) print(f" {sub_icon} {sub_name}: {sub_check['detail']}") print() -def parse_args(): +def parse_args(argv: Optional[List[str]] = None) -> argparse.Namespace: parser = argparse.ArgumentParser(description="Health check tool") parser.add_argument("--service", "-s", help="Check specific service only") parser.add_argument("--json", "-j", action="store_true", help="JSON output") parser.add_argument("--watch", "-w", action="store_true", help="Continuous monitoring") parser.add_argument("--interval", "-i", type=int, default=30, help="Check interval in seconds") parser.add_argument("--output", "-o", help="Output file path") - return parser.parse_args() - - -def main(): + parser.add_argument("--max-retries", type=int, default=0, help="HTTP probe retry count") + parser.add_argument( + "--backoff-factor", + type=float, + default=1.0, + help="HTTP probe exponential backoff factor", + ) + parser.add_argument( + "--circuit-threshold", + type=int, + default=3, + help="Consecutive HTTP probe failures before opening a circuit", + ) + parser.add_argument( + "--circuit-cooldown", + type=float, + default=DEFAULT_CIRCUIT_COOLDOWN_SECONDS, + help="Seconds before an open HTTP probe circuit can retry", + ) + return parser.parse_args(argv) + + +def main() -> int: + logging.basicConfig(level=logging.WARNING, format="%(levelname)s: %(message)s") args = parse_args() if args.watch: print(f"Continuous monitoring (interval: {args.interval}s). Press Ctrl+C to stop.") try: while True: - results = run_health_checks(args.service, args.json) + results = run_health_checks( + args.service, + args.json, + args.max_retries, + args.backoff_factor, + args.circuit_threshold, + args.circuit_cooldown, + ) if args.json: print(json.dumps(results, indent=2)) else: @@ -326,7 +549,14 @@ def main(): except KeyboardInterrupt: print("\nMonitoring stopped") else: - results = run_health_checks(args.service, args.json) + results = run_health_checks( + args.service, + args.json, + args.max_retries, + args.backoff_factor, + args.circuit_threshold, + args.circuit_cooldown, + ) if args.json: output = json.dumps(results, indent=2) print(output)