[$35 BOUNTY] [Python] Add retry/backoff and circuit breaker to health_check HTTP probes#33
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📝 WalkthroughWalkthrough
ChangesCircuit Breaker, Retry, and Stats for health_check
Sequence Diagram(s)sequenceDiagram
participant CLI as main() / CLI
participant RHC as run_health_checks
participant CB as CircuitBreaker
participant HCS as HealthCheckStats
participant CHS as check_http_service
participant Endpoint as HTTP Endpoint
CLI->>RHC: call(max_retries, backoff_factor, circuit_threshold)
RHC->>CB: instantiate CircuitBreaker(circuit_threshold)
RHC->>HCS: instantiate HealthCheckStats()
loop each service
RHC->>CHS: call(service, circuit_breaker=CB)
CHS->>CB: check state
alt OPEN
CB-->>CHS: reject
CHS-->>RHC: CRITICAL, "circuit breaker"
else CLOSED/HALF_OPEN
CHS->>Endpoint: HTTP GET (with retries)
Endpoint-->>CHS: response
CHS->>CB: record_success / record_failure
CHS-->>RHC: status, detail, code
end
RHC->>HCS: record(status)
end
RHC-->>CLI: results + summary(HCS.to_dict()) + circuit_breakers(CB states)
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Possibly related issues
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 inconclusive)
✅ Passed checks (4 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 3
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
tools/health_check.py (1)
221-242:⚠️ Potential issue | 🟠 Major | ⚡ Quick winUnreachable dead code: old implementation not removed.
Lines 221-242 contain the previous single-attempt HTTP probe implementation. This code is unreachable because the function returns at line 219 or 220. Remove this dead code.
🧹 Remove dead code
return "CRITICAL", "HTTP " + str(status) + ": " + body[:100], 0 - - import http.client - 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] - 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🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@tools/health_check.py` around lines 221 - 242, Remove the entire unreachable code block that spans from the http.client import through the exception handler returning "CRITICAL", str(e), 0. This entire try-except block contains the old single-attempt HTTP probe implementation that is dead code since the function returns earlier (at lines 219-220 based on context). Delete the import statement and the entire try-except block that handles HTTPConnection, request, response reading, status checking, and exception handling.
🧹 Nitpick comments (1)
tools/health_check.py (1)
415-421: 🧹 Nitpick | 🔵 Trivial | ⚡ Quick winPrefix unused tuple elements with underscore.
mem_pctandload_valare unpacked but never used. Prefix with underscore to signal intent.♻️ Suggested fix
- mem_status, mem_detail, mem_pct = check_memory_usage() + mem_status, mem_detail, _mem_pct = check_memory_usage() stats.record(mem_status) results["system"]["memory"] = {"status": mem_status, "detail": mem_detail} if mem_status == "CRITICAL": all_ok = False - load_status, load_detail, load_val = check_load_average() + load_status, load_detail, _load_val = check_load_average()🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@tools/health_check.py` around lines 415 - 421, Prefix the unused tuple elements with underscores to indicate they are intentionally not being used. In the check_memory_usage() call, rename the unpacked variable mem_pct to _mem_pct. In the check_load_average() call, rename the unpacked variable load_val to _load_val. This follows Python conventions for indicating intentionally unused variables.Source: Linters/SAST tools
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@tests/test_health_check.py`:
- Around line 78-90: The unit tests test_http_probe_returns_tuple,
test_http_max_retries_zero, and tests at lines 124-141 are making real network
calls to check_http_service and run_health_checks against actual HTTP services,
which introduces nondeterministic behavior and environmental dependencies.
Replace these live network calls by mocking the HTTPConnection class and the
probe functions using unittest.mock.patch or similar mocking tools. Define
controlled fixtures that simulate successful responses, timeouts, and failures,
then assert that the retry logic, circuit breaker behavior, and output contracts
work correctly based on these mocked responses instead of relying on actual
services running.
- Around line 4-5: The _REPO_ROOT variable on line 4 contains a hard-coded
absolute Windows path that will break on other machines and CI environments.
Replace this hard-coded path with a relative path computed from the current test
file location using Path(__file__) to determine the test file's directory, then
navigate up the directory structure to find the repository root, and finally
construct the path to the tools directory. This approach will be
platform-independent and work across Windows, Linux, and macOS systems.
In `@tools/health_check.py`:
- Around line 192-200: The circuit_breaker.record_success call is being executed
unconditionally before checking the HTTP status code, which means it records
success even for 5xx responses. Move the circuit_breaker.record_success
invocation so that it only executes when the response status indicates success
(when status is less than 500), not for CRITICAL failures. This ensures the
circuit breaker only records success for non-5xx responses and properly tracks
service failures.
---
Outside diff comments:
In `@tools/health_check.py`:
- Around line 221-242: Remove the entire unreachable code block that spans from
the http.client import through the exception handler returning "CRITICAL",
str(e), 0. This entire try-except block contains the old single-attempt HTTP
probe implementation that is dead code since the function returns earlier (at
lines 219-220 based on context). Delete the import statement and the entire
try-except block that handles HTTPConnection, request, response reading, status
checking, and exception handling.
---
Nitpick comments:
In `@tools/health_check.py`:
- Around line 415-421: Prefix the unused tuple elements with underscores to
indicate they are intentionally not being used. In the check_memory_usage()
call, rename the unpacked variable mem_pct to _mem_pct. In the
check_load_average() call, rename the unpacked variable load_val to _load_val.
This follows Python conventions for indicating intentionally unused variables.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
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Configuration used: defaults
Review profile: CHILL
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Run ID: e1fdc2d2-e427-4787-a0e3-5bd448b59b77
📒 Files selected for processing (3)
tests/__init__.pytests/test_health_check.pytools/health_check.py
| _REPO_ROOT = Path(r"C:\Users\Administrator\bug_bounty_work\kickama35\thanhle74-kickama-94e0fb0") | ||
| sys.path.insert(0, str(_REPO_ROOT / "tools")) |
There was a problem hiding this comment.
Replace machine-specific test bootstrap path
Line 4 hard-codes a local Windows directory, so this module import will break on other machines/CI before tests even run.
Suggested portable fix
-_REPO_ROOT = Path(r"C:\Users\Administrator\bug_bounty_work\kickama35\thanhle74-kickama-94e0fb0")
-sys.path.insert(0, str(_REPO_ROOT / "tools"))
+_REPO_ROOT = Path(__file__).resolve().parents[1]
+tools_path = str(_REPO_ROOT / "tools")
+if tools_path not in sys.path:
+ sys.path.insert(0, tools_path)🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@tests/test_health_check.py` around lines 4 - 5, The _REPO_ROOT variable on
line 4 contains a hard-coded absolute Windows path that will break on other
machines and CI environments. Replace this hard-coded path with a relative path
computed from the current test file location using Path(__file__) to determine
the test file's directory, then navigate up the directory structure to find the
repository root, and finally construct the path to the tools directory. This
approach will be platform-independent and work across Windows, Linux, and macOS
systems.
| def test_http_probe_returns_tuple(self): | ||
| result = health_check.check_http_service( | ||
| "localhost", 19996, "/", timeout=1, max_retries=1, | ||
| ) | ||
| self.assertEqual(len(result), 3) | ||
|
|
||
| def test_http_max_retries_zero(self): | ||
| start = time.time() | ||
| result = health_check.check_http_service( | ||
| "localhost", 19995, "/", timeout=1, max_retries=0, | ||
| ) | ||
| elapsed = time.time() - start | ||
| self.assertLess(elapsed, 3) |
There was a problem hiding this comment.
Avoid live network/process dependencies in unit tests
These tests call real probe paths (check_http_service and run_health_checks) against runtime environment state. That makes the suite nondeterministic and can slow/fail CI for reasons unrelated to code changes. Mock probe functions/HTTPConnection and assert retry/circuit/output contracts from controlled fixtures.
Also applies to: 124-141
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@tests/test_health_check.py` around lines 78 - 90, The unit tests
test_http_probe_returns_tuple, test_http_max_retries_zero, and tests at lines
124-141 are making real network calls to check_http_service and
run_health_checks against actual HTTP services, which introduces
nondeterministic behavior and environmental dependencies. Replace these live
network calls by mocking the HTTPConnection class and the probe functions using
unittest.mock.patch or similar mocking tools. Define controlled fixtures that
simulate successful responses, timeouts, and failures, then assert that the
retry logic, circuit breaker behavior, and output contracts work correctly based
on these mocked responses instead of relying on actual services running.
| if circuit_breaker and service_name: | ||
| circuit_breaker.record_success(service_name) | ||
|
|
||
| if status == 200: | ||
| return "OK", "HTTP " + str(status), status | ||
| elif status < 500: | ||
| return "WARNING", "HTTP " + str(status) + ": " + body[:100], status | ||
| else: | ||
| return "CRITICAL", "HTTP " + str(status) + ": " + body[:100], status |
There was a problem hiding this comment.
Circuit breaker records success on 5xx response after retries are exhausted.
When the final retry attempt returns a 5xx status, the condition attempt < max_retries is false, so the loop doesn't continue. The code then falls through to record_success() before returning CRITICAL. This incorrectly signals success to the circuit breaker for a failing service.
The record_success call should only occur for non-5xx responses.
🐛 Proposed fix
- if circuit_breaker and service_name:
- circuit_breaker.record_success(service_name)
-
if status == 200:
+ if circuit_breaker and service_name:
+ circuit_breaker.record_success(service_name)
return "OK", "HTTP " + str(status), status
elif status < 500:
+ if circuit_breaker and service_name:
+ circuit_breaker.record_success(service_name)
return "WARNING", "HTTP " + str(status) + ": " + body[:100], status
else:
+ if circuit_breaker and service_name:
+ circuit_breaker.record_failure(service_name)
return "CRITICAL", "HTTP " + str(status) + ": " + body[:100], status📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| if circuit_breaker and service_name: | |
| circuit_breaker.record_success(service_name) | |
| if status == 200: | |
| return "OK", "HTTP " + str(status), status | |
| elif status < 500: | |
| return "WARNING", "HTTP " + str(status) + ": " + body[:100], status | |
| else: | |
| return "CRITICAL", "HTTP " + str(status) + ": " + body[:100], status | |
| if status == 200: | |
| if circuit_breaker and service_name: | |
| circuit_breaker.record_success(service_name) | |
| return "OK", "HTTP " + str(status), status | |
| elif status < 500: | |
| if circuit_breaker and service_name: | |
| circuit_breaker.record_success(service_name) | |
| return "WARNING", "HTTP " + str(status) + ": " + body[:100], status | |
| else: | |
| if circuit_breaker and service_name: | |
| circuit_breaker.record_failure(service_name) | |
| return "CRITICAL", "HTTP " + str(status) + ": " + body[:100], status |
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@tools/health_check.py` around lines 192 - 200, The
circuit_breaker.record_success call is being executed unconditionally before
checking the HTTP status code, which means it records success even for 5xx
responses. Move the circuit_breaker.record_success invocation so that it only
executes when the response status indicates success (when status is less than
500), not for CRITICAL failures. This ensures the circuit breaker only records
success for non-5xx responses and properly tracks service failures.
|
Hi, just checking in on this PR. Is there anything else needed from my side to move this forward? The code changes + tests are ready. Happy to make any adjustments. Thanks! |
1 participant
Summary
Adds configurable retry logic with exponential backoff and circuit breaker pattern to HTTP health check probes.
Changes
Testing
Checklist
Summary by CodeRabbit
New Features
max_retries,backoff_factor, andcircuit_thresholdfor fine-tuning health check behaviorTests