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Modernize network dialing to use Go's context-aware patterns for better
cancellation support and connection reliability.
Changes:
- Update Go version from 1.24 to 1.25 in go.mod
- Replace ssh.Dial with net.Dialer.DialContext + ssh.NewClientConn
for SSH client connections in serverconnection.go
- Add TCP KeepAlive (30s) for SSH connection health monitoring
- Implement context-aware dialing for SSH agent connections in ssh.go
- Improve error messages to distinguish dial vs SSH handshake failures
- Update AGENTS.md with integration test requirements
Benefits:
- Context cancellation now properly affects connection establishment
- TCP KeepAlive prevents silent connection failures
- Better integration with Go's cancellation patterns
- Improved reliability for distributed systems
All integration tests pass with race detection enabled.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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This commit adds two major features and fixes:
1. SSH Agent Key Selection:
- Add --agentKeyIndex flag to select specific SSH agent key (0-based)
- Solves "too many authentication failures" with multiple SSH keys
- Default -1 uses all keys (backwards compatible)
- Available in dtail, dcat, dgrep, dmap commands
2. MapReduce Outfile Fixes:
- CSV files now written at every interval, not just on exit
- Proper signal handling (SIGTERM/SIGINT) with graceful shutdown
- 5-second grace period for cleanup before force exit
- Fixes issue where outfile remained as .tmp during execution
Usage:
dtail --servers host --agentKeyIndex 0 --query '...' outfile results.csv
This is particularly useful with YubiKey/hardware tokens where many
keys are loaded in the SSH agent, and for monitoring MapReduce results
in real-time as they're computed.
Co-authored-by: Cursor <cursoragent@cursor.com>
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- Add explicit interface satisfaction checks (var _ Interface = (*Type)(nil)) for compile-time verification:
- TurboWriter implementations (DirectTurboWriter, TurboChannelWriter)
- Processor implementations (GrepLineProcessor, ChannellessLineProcessor)
- Parser implementations (genericParser, csvParser, genericKVParser, custom parsers, mimecastParser)
- Logger implementations (file, stdout)
- Handler implementations (ServerHandler, ClientHandler)
- Connector implementations (Serverless, ServerConnection)
- SSH callback implementations (KnownHostsCallback)
- Improve error handling with context wrapping (%w):
- SSH operations: GeneratePrivateRSAKey, Agent
- Query parsing: Query.parse
- SSH client connections: dial, session, handle methods
- Fix receiver consistency:
- Convert Query.String() from value to pointer receiver
- Convert Outfile.String() from value to pointer receiver
- Convert all KnownHostsCallback methods to pointer receivers
- Convert mapCommand.Start() to pointer receiver
- Reorganize file structure for better clarity:
- internal/io/dlog/dlog.go: Move type definition before public functions
- internal/mapr/token.go: Reorganize helper functions after public ones
- Add documentation comments:
- Query.String() method
- Outfile.String() method
- Regex.String() method
- Improve config variable documentation
All unit tests and integration tests pass.
Amp-Thread-ID: https://ampcode.com/threads/T-019c0b08-0eeb-705d-a1f7-31bb764b659a
Co-authored-by: Amp <amp@ampcode.com>
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logger package rewrite as dlog
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