Use retry library #641
Use retry library #641
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WalkthroughThe pull request updates dependency management and error handling. In the Changes
Sequence Diagram(s)sequenceDiagram
participant SW as syncWorker
participant OP as ConnectionLogic
participant BO as backoff.Retry
participant LOG as Logger
SW->>BO: Invoke backoff.Retry with operation
BO->>OP: Execute connection attempt
alt Successful Connection
OP-->>BO: Return success
BO-->>SW: Exit retry loop
else Failed Connection
OP-->>BO: Return error
BO->>LOG: Log error details
BO->>OP: Retry connection after delay
end
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Actionable comments posted: 1
🧹 Nitpick comments (2)
go.mod (1)
12-12: Check gRPC integration for Prometheus.
github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0should be compatible with gRPC v1.71.0, but confirm no known mismatch or required config changes to enable metrics collection.pkg/sync/syncWorker.go (1)
195-205: Refine error handling within the deferred function.
Using adefer func() { if err != nil {...} }()insideoperationcaptures the outererrvariable. This works but can be confusing, because the final value oferris logged right before the function returns. Consider either logging errors inline or renaming the local error variable to avoid overshadowing:-operation := func() (string, error) { - defer func() { - if err != nil { - s.log.Error("Error connecting to node. Retrying...", zap.Error(err)) - } - }() +operation := func() (string, error) { + var opErr error + defer func() { + if opErr != nil { + s.log.Error("Error connecting to node. Retrying...", zap.Error(opErr)) + } + }() ... - conn, err = s.connectToNode(*node) + conn, opErr = s.connectToNode(*node) ... }Also applies to: 207-209, 211-215, 217-230
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📒 Files selected for processing (2)
go.mod(2 hunks)pkg/sync/syncWorker.go(3 hunks)
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- GitHub Check: Test (Node)
- GitHub Check: Build pre-baked anvil-xmtpd
- GitHub Check: Lint-Go
🔇 Additional comments (5)
go.mod (2)
6-8: Pinning new dependencies looks good.
These additions—particularlycenkalti/backoff/v5—directly support a new retry mechanism. Ensure there's no version conflict with any existing references (e.g., older backoff versions marked as indirect in line 53).
10-10: Validate JWT dependency version.
github.com/golang-jwt/jwt/v5 v5.2.1looks current, but consider verifying any known security advisories or bug reports to confirm no unresolved vulnerabilities in v5.2.1.pkg/sync/syncWorker.go (3)
7-7: Imports align with new retry and metrics usage.
These newly added imports ("github.com/cenkalti/backoff/v5","github.com/xmtp/xmtpd/pkg/metrics", as well as"io","sync", and"time") appear consistent with the updated retry logic and streaming design.Also applies to: 15-15, 24-26
192-194: Initialize maximum backoff parameters.
Currently, onlyInitialIntervalis configured. LeavingMaxIntervalorMaxElapsedTimeat default might result in excessively long, unbounded retry intervals in certain failure modes. Consider capping these values:expBackoff := backoff.NewExponentialBackOff() expBackoff.InitialInterval = 1 * time.Second +expBackoff.MaxInterval = 60 * time.Second // Adjust as appropriate +expBackoff.MaxElapsedTime = 0 // 0 disables the total limit, or set a suitable time limit
232-238:❓ Verification inconclusive
Clarify the infinite loop around
backoff.Retry.
Afteroperationeventually succeeds,backoff.Retryreturns nil, causing the code to loop again. This re-invokes the same retry flow indefinitely. If the intent is to re-subscribe upon stream closure in perpetuity, this is fine—but it might be more intuitive to break out once we have a successful subscription, re-entering only if a new error arises:for { - _, err = backoff.Retry(registration.ctx, operation, backoff.WithBackOff(expBackoff)) - if err != nil { - return - } + _, subErr := backoff.Retry(registration.ctx, operation, backoff.WithBackOff(expBackoff)) + if subErr != nil { + return + } + // Potentially break here if we want to stop re-subscribing }
Infinite Loop Behavior in
backoff.RetryThe current code repeatedly invokes
backoff.Retryin an infinite loop—even when theoperationeventually succeeds (i.e. whenbackoff.Retryreturns nil). If the goal is to re-subscribe every time the stream closes, then the logic is valid, but it would benefit from an inline comment clarifying this intent. Alternatively, if you prefer to cease retry attempts after a successful subscription, consider breaking out of the loop. For example:for { - _, err = backoff.Retry(registration.ctx, operation, backoff.WithBackOff(expBackoff)) - if err != nil { - return - } + _, subErr := backoff.Retry(registration.ctx, operation, backoff.WithBackOff(expBackoff)) + if subErr != nil { + return + } + // Optionally: break out here if you do not intend to re-subscribe on a successful operation. }Please verify that the intended behavior—whether continuous re-subscription or a single successful subscription—is clearly documented and matches your overall design.
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🧹 Nitpick comments (2)
pkg/sync/syncWorker.go (2)
192-194: Good implementation of exponential backoff.Setting up the exponential backoff with an initial interval of 1 second is a good starting point. The code now uses a more standardized and robust approach for handling retries.
You might consider making the initial interval configurable through a constant or configuration parameter for better flexibility in different environments.
234-238: Consider returning a more descriptive error message.The function returns an empty string as the first return value and a nil error when the stream disconnects. While this works correctly to reset the backoff, consider providing a more descriptive string for logging or debugging purposes.
- return "", nil // try again from the start and reset backoff + return "Stream disconnected, resetting backoff", nil // try again from the start and reset backoff
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pkg/sync/syncWorker.go(3 hunks)
🔇 Additional comments (5)
pkg/sync/syncWorker.go (5)
7-7: Import of backoff library looks good.The introduction of the
github.com/cenkalti/backoff/v5package is appropriate for implementing exponential backoff retry logic, which is a significant improvement over manual retry logic.
195-238: Well-structured operation function with proper resource management.The operation function encapsulates the connection logic very well with several improvements:
- Proper resource cleanup using defer statements
- Clear error handling and logging
- Context cancellation check to prevent unnecessary retries
- Appropriate metrics tracking for connection success/failure
This approach significantly improves the readability and maintainability of the retry logic.
220-222: Good use of permanent error for context cancellation.Using
backoff.Permanentto stop retrying when the context is canceled is the correct approach. This ensures the retry mechanism stops gracefully when the operation should no longer be attempted.
240-246: Clean implementation of the retry loop.The retry loop using
backoff.Retrywith the configured exponential backoff is much cleaner and more robust than a manual implementation. The error handling is also appropriate, exiting the loop only when necessary (context cancellation or permanent errors).
242-242:✅ Verification successful
Verify backoff.Retry usage with context.
The
backoff.Retryfunction is correctly used with the context through theregistration.ctxparameter. This ensures that the retry mechanism respects context cancellation and doesn't continue retrying indefinitely.
🌐 Web query:
How to properly use context cancellation with cenkalti/backoff v5?💡 Result:
To properly handle context cancellation with
cenkalti/backoffv5, use the library's context integration features in these key patterns:1. Using
Retrywith ContextThe modern approach uses
Retrywhich natively handles context cancellation:import ( "context" "github.com/cenkalti/backoff/v5" ) operation := func() error { // Your context-aware operation if err := ctx.Err(); err != nil { return err // Abort on context cancellation } return doWork() } err := backoff.Retry(operation, backoff.WithContext( backoff.NewExponentialBackOff(), ctx, ), )2. Manual Control with BackOffContext
For granular control in loops:
b := backoff.WithContext( backoff.NewExponentialBackOff(), ctx, ) for { select { case <-ctx.Done(): return ctx.Err() default: nextWait := b.NextBackOff() if nextWait == backoff.Stop { return errors.New("max retries exceeded") } time.Sleep(nextWait) err := operation() if err == nil { return nil } } }Key Features [1][5][13]
- Automatic Cancellation: Wrapped backoffs via
WithContext()automatically returnStopwhen context is cancelled- Early Exit: Always check
ctx.Err()in operations for immediate cancellation- Resource Cleanup: Use
defer cancel()in parent context to ensure proper cleanupCommon Patterns
Timeout Enforcement:
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second) defer cancel() backoff.Retry( func() error { return ctxAwareOperation(ctx) }, backoff.WithContext(backoff.NewExponentialBackOff(), ctx), )Graceful Shutdown:
b := backoff.NewExponentialBackOff() bCtx := backoff.WithContext(b, ctx) for !isShuttingDown() { next := bCtx.NextBackOff() if next == backoff.Stop { break // Context cancelled or max retries reached } time.Sleep(next) // Retry logic... }Important Notes
- Operations should be context-aware themselves for best results [6][13]
- Combine with
WithMaxRetries()for hybrid timeout/retry limits [1][5]- The library handles channel management internally in
Retry()[13]For complex scenarios, consider wrapping the backoff policy early using
WithContext()to ensure all retry logic respects cancellation signals.Citations:
- 1: https://pkg.go.dev/github.com/cenkalti/backoff
- 2: https://github.com/cenkalti/backoff
- 3: https://gerrit.hackerspace.pl/plugins/gitiles/hscloud/+/d9e32f19f655b85feeeb2e50877c4ba9b423d31a%5E2..d9e32f19f655b85feeeb2e50877c4ba9b423d31a/
- 4: https://pkg.go.dev/github.com/philippseith/signalr
- 5: https://github.com/cenkalti/backoff/blob/v5/backoff.go
- 6: context timeout via <-ctx.Done() cenkalti/backoff#95
- 7: https://newreleases.io/project/github/moby/buildkit/release/v0.18.0
- 8: https://chromium.googlesource.com/external/github.com/cenkalti/backoff/
- 9: https://raw.githubusercontent.com/avelino/awesome-go/master/README.md
- 10: https://github.com/cenkalti/backoff/blob/v5/retry_test.go
- 11: https://hub.cloudquery.io/plugins/source/cloudquery/tailscale/latest/docs
- 12: https://thalesdocs.com/ctp/cm/2.11/extern/notices.txt
- 13: https://github.com/cenkalti/backoff/blob/v5/retry.go
- 14: https://hubdoc.worldprogramming.com/2023.4.3/about/notices/
- 15: https://chromium.googlesource.com/external/github.com/cenkalti/backoff/+/b7325b0f3f1097c6546ea5e83c4a23267e58ad71/context.go
- 16: https://www.vcluster.com/docs/v0.19/licenses/vcluster/
- 17: https://chromium.googlesource.com/external/github.com/cenkalti/backoff/+/refs/heads/v5
- 18: https://deps.dev/go/github.com%2Fcenkalti%2Fbackoff/v2.2.1+incompatible
- 19: https://git.frostfs.info/mbiryukova/lego/src/commit/4c823ed3c04f7266a6b6b8c5e054c33f837e32fc/CHANGELOG.md
- 20: https://gitlab.com/gitlab-org/container-registry/-/merge_requests/1988
Context cancellation in backoff.Retry is correctly implemented
The use of
backoff.Retry(registration.ctx, operation, backoff.WithBackOff(expBackoff))inpkg/sync/syncWorker.go(line 242) properly integrates context handling. Passingregistration.ctxas the first argument ensures that retries will stop as soon as the context is canceled, which aligns with the best practices described for cenkalti/backoff v5.No changes are needed here.
<!-- This is an auto-generated comment: release notes by coderabbit.ai --> - **Chores** - Updated dependency management by consolidating and updating key components for improved maintenance and compatibility. - **Refactor** - Enhanced connection stability with a more robust error handling and exponential retry mechanism for smoother operations. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
Summary by CodeRabbit
Chores
Refactor