fix: measure memory while containers are running, not after teardown#1765
fix: measure memory while containers are running, not after teardown#1765
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Previously benchmarkMemory() ran `echo measuring_memory` which completed instantly, so containers were already stopped before docker stats ran, always reporting 0 MB. Now spawns awf with `sleep 30` in the background, polls until containers are healthy, then samples docker stats while containers are alive. Closes #1758 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Pull request overview
Fixes the CI performance benchmark’s memory measurement so it samples docker stats while AWF containers are still running (instead of after AWF teardown), addressing the “always 0 MB” issue.
Changes:
- Reworks
benchmarkMemory()to runawf ... sleep 30in a background process and measure memory while containers are alive. - Adds polling (
waitForContainers) plus a short stabilization delay before samplingdocker stats. - Adds best-effort background process cleanup (
killBackground) and ensures cleanup runs infinally.
Show a summary per file
| File | Description |
|---|---|
scripts/ci/benchmark-performance.ts |
Updates the memory benchmark to keep containers running during measurement and adds background process lifecycle management. |
Copilot's findings
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- Comments generated: 5
scripts/ci/benchmark-performance.ts
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| `sudo docker ps --filter name=${name} --filter status=running --format '{{.Names}}' 2>/dev/null`, | ||
| { encoding: "utf-8", timeout: 5_000 } | ||
| ).trim(); | ||
| return result.includes(name); |
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waitForContainers() uses docker ps --filter name=${name} and then result.includes(name). Docker's name filter is a regex/substring match, so this can return true for containers like awf-squid-old, leading to false positives. Use an anchored name filter (e.g., name=^${name}$) and/or require an exact match on the returned name(s).
| `sudo docker ps --filter name=${name} --filter status=running --format '{{.Names}}' 2>/dev/null`, | |
| { encoding: "utf-8", timeout: 5_000 } | |
| ).trim(); | |
| return result.includes(name); | |
| `sudo docker ps --filter name=^${name}$ --filter status=running --format '{{.Names}}' 2>/dev/null`, | |
| { encoding: "utf-8", timeout: 5_000 } | |
| ) | |
| .trim() | |
| .split("\n") | |
| .map((containerName) => containerName.trim()) | |
| .filter(Boolean); | |
| return result.some((containerName) => containerName === name); |
| // Wait for both containers to be running (up to 30s) | ||
| await waitForContainers(["awf-squid", "awf-agent"], 30_000); | ||
|
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||
| // Give containers a moment to stabilize memory usage | ||
| await new Promise((resolve) => setTimeout(resolve, 2000)); | ||
|
|
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The benchmark proceeds once containers are merely status=running. Since Squid has a Docker healthcheck (and the agent depends on it), sampling memory before Squid is healthy can make the metric noisy and can mask startup failures/restarts. Consider waiting for Squid to be healthy (e.g., via docker ps --filter health=healthy or docker inspect health status) before taking the memory sample.
| detached: true, | ||
| stdio: "ignore", | ||
| } | ||
| ); |
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Because the child process is spawned with detached: true and stdio: 'ignore', it’s typically a good idea to call child.unref() after spawning. This prevents the parent benchmark script from being kept alive if cleanup/kill logic fails in an edge case.
| ); | |
| ); | |
| child.unref(); |
| try { | ||
| if (child.pid) { | ||
| // Kill the process group (negative PID) to catch child processes | ||
| process.kill(-child.pid, "SIGTERM"); | ||
| } | ||
| } catch { | ||
| // Process may have already exited | ||
| } | ||
| try { |
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killBackground() sends SIGTERM to the process group but then only SIGKILLs the direct child PID. If the group spawns additional processes that ignore SIGTERM, they can survive. Consider sending SIGKILL to the process group as well (optionally after a short grace period), instead of only killing the child process.
| try { | |
| if (child.pid) { | |
| // Kill the process group (negative PID) to catch child processes | |
| process.kill(-child.pid, "SIGTERM"); | |
| } | |
| } catch { | |
| // Process may have already exited | |
| } | |
| try { | |
| const pid = child.pid; | |
| if (!pid) { | |
| return; | |
| } | |
| try { | |
| // Kill the process group (negative PID) to catch child processes | |
| process.kill(-pid, "SIGTERM"); | |
| } catch { | |
| // Process group may have already exited | |
| } | |
| try { | |
| // Force-kill the entire process group so descendant processes do not survive | |
| process.kill(-pid, "SIGKILL"); | |
| } catch { | |
| // Process group may have already exited | |
| } | |
| try { | |
| // Best-effort fallback for the direct child process |
| child = spawn( | ||
| "sudo", | ||
| ["awf", "--allow-domains", ALLOWED_DOMAIN, "--log-level", "error", "--", "sleep", "30"], | ||
| { |
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This path hard-codes sudo + awf in spawn(...) even though the script already defines AWF_CMD = "sudo awf" and uses it elsewhere. To avoid future drift (e.g., if AWF_CMD changes), consider deriving the spawned command/args from AWF_CMD or otherwise reusing that constant.
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Security Review: PR #1765 — Memory Benchmark Fix
Overall Assessment
Risk: Low. This PR modifies a CI-only benchmark script (scripts/ci/benchmark-performance.ts) that runs in controlled CI environments with hardcoded inputs. No user-controlled data reaches shell execution. The changes are functionally sound and improve the correctness of memory measurement.
Detailed Findings
1. Process Group Cleanup — Low
The killBackground() function sends SIGTERM to the process group (-child.pid) followed by SIGKILL to the child. This is a solid pattern.
Minor gap: There is no timeout between SIGTERM and SIGKILL. The SIGTERM to the process group may not have propagated before SIGKILL fires on the direct child, potentially leaving grandchildren (the awf process tree includes Docker containers). However, this is mitigated by the cleanup() call in the finally block, which explicitly tears down containers via docker compose down -v and docker rm -f.
Verdict: Acceptable. The finally block's cleanup() is the real safety net for container teardown, and the killBackground() is best-effort process cleanup. No resource leak risk in practice.
2. No Command Injection Risk — Info
All arguments to spawn() are hardcoded constants ("sudo", "awf", "--allow-domains", ALLOWED_DOMAIN, etc.) passed as an array — not interpolated into a shell string. The spawn call does not use shell: true, so no shell metacharacter injection is possible even if constants were somehow modified. This is a good pattern.
Similarly, waitForContainers() uses execSync with the container name interpolated from a hardcoded array ["awf-squid", "awf-agent"] — no user input reaches these commands.
3. Detached Process with stdio: "ignore" — Low
The spawn call uses detached: true and stdio: "ignore". The detached flag creates a new process group, which is required for the -child.pid group kill in killBackground() to work. The stdio: "ignore" prevents the child from holding the parent's streams open. This is correct.
Edge case: If the Node.js process is killed with SIGKILL (uncatchable), the detached sudo awf ... sleep 30 process group will survive as an orphan. The sleep 30 command inside the container will naturally exit after 30 seconds, which will trigger AWF's normal container teardown. The worst case is a 30-second container leak, which is acceptable for a CI benchmark script and is further mitigated by CI's always() cleanup jobs.
4. Polling Loop Timeout — Low
waitForContainers() has a 30-second timeout, preventing indefinite hangs. Each execSync call inside the poll also has its own 5-second timeout. This is well-bounded.
Note: The overall execution per iteration is bounded by: 30s container wait + 2s stabilization + docker stats calls (each with the exec() helper's 120s default timeout). In the worst case, a single iteration could take ~2.5 minutes. With 5 iterations, total memory benchmark time could reach ~12.5 minutes in a pathological scenario. This is unlikely but worth noting for CI timeout planning.
5. sudo Usage — Info
The script uses sudo for awf, docker stats, and docker ps. This is consistent with the existing codebase pattern — AWF requires sudo for iptables manipulation. The script is only invoked in CI contexts where sudo is available without a password. No new privilege escalation surface is introduced.
6. Container Name Filter in docker ps — Low
`sudo docker ps --filter name=${name} --filter status=running --format '{{.Names}}' 2>/dev/null`The name variable comes from the hardcoded array ["awf-squid", "awf-agent"]. If these names ever contained shell metacharacters, the execSync call would interpret them. Since they are hardcoded alphanumeric-plus-hyphen strings, this is safe. If this function were ever generalized to accept external input, it would need parameterization.
7. Cleanup in finally Block — Info (Positive)
Moving cleanup() into the finally block is strictly better than the previous pattern where cleanup() was called after the try/catch. The finally block guarantees cleanup runs even if an unhandled exception occurs within the try. This is a security improvement.
Summary
| # | Finding | Severity |
|---|---|---|
| 1 | No grace period between SIGTERM and SIGKILL in killBackground() |
Low |
| 2 | No command injection — hardcoded args, array-based spawn | Info |
| 3 | Detached orphan survives SIGKILL, self-heals via sleep timeout | Low |
| 4 | Polling loop properly bounded with 30s timeout | Low |
| 5 | sudo usage consistent with existing patterns |
Info |
| 6 | Container name filter safe due to hardcoded values | Low |
| 7 | finally-based cleanup is an improvement over previous pattern |
Info (Positive) |
Recommendation: Approve. No blocking security concerns. The only minor hardening suggestion would be adding a small delay (e.g., 500ms) between SIGTERM and SIGKILL in killBackground() to give the process group time to terminate gracefully, but this is cosmetic given the cleanup() safety net.
— Security Review Agent
- Use anchored regex (^name$) in docker ps filter to avoid substring false positives from similarly-named containers - Send SIGKILL to the entire process group (not just the direct child) so descendant processes like sudo/awf/docker don't survive - Add child.unref() to prevent parent from hanging if cleanup fails - Derive spawn args from AWF_CMD constant to avoid drift Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Addressed all Copilot review feedback in 096f284:
Regarding the suggestion to wait for Squid health status: the 2-second stabilization delay after containers are running serves a similar purpose and keeps the implementation simpler. The benchmark is measuring steady-state memory, not startup memory, so the delay is sufficient. |
Smoke Test Results
Overall: PASS
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🔥 Smoke Test Results
PR: fix: measure memory while containers are running, not after teardown Overall: PASS
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Smoke Test: GitHub Actions Services Connectivity ✅
All checks passed.
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🏗️ Build Test Suite Results
Overall: 8/8 ecosystems passed — ✅ PASS
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Smoke Test (run 24107839303)
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Summary
benchmarkMemory()inscripts/ci/benchmark-performance.tswhich always reported 0 MB because containers were already stopped beforedocker statsranawfwithsleep 30in the background, polls until containers are healthy, then samplesdocker statswhile containers are alivekillBackground+ process group kill) to handle edge casesDetails
The previous implementation ran
echo measuring_memoryas the AWF command, which completed instantly. Even with--keep-containers, by the timedocker statsexecuted the containers were gone.The fix:
awf ... sleep 30as a detached background process viachild_process.spawndocker psat 500ms intervals until bothawf-squidandawf-agentare running (30s timeout)docker statswhile containers are alivefinallyblockCloses #1758
Test plan
npm run buildsucceedsnpm testpasses (1311 tests)npm run lintpasses on modified filenpx tsx🤖 Generated with Claude Code