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zfs-data-transfer.md

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ZFS Data Transfer Module Overview

Core Components

pkg/zfs/dataset/data_transfer.go

  1. Configuration Types
    • SendConfig - Controls ZFS send operation
    • ReceiveConfig - Controls ZFS receive operation
    • RemoteConfig - SSH connection parameters
  2. Key Functions
    • SendReceive() - Main data transfer handler
    • GetResumeToken() - Resume token management
    • buildSSHCommand() - SSH command construction
    • parseSSHOptions() - SSH option validation

Security Measures

  1. Command Injection Prevention

    • Input validation using regex patterns
    • Shell metacharacter filtering
    • Path traversal prevention
    • Command argument sanitization

  2. SSH Security

    • Whitelisted SSH options
    • Private key path validation
    • Host/user validation
    • Connection hardening options

  3. Resource Protection

    • Command timeouts
    • Process cleanup
    • Error propagation
    • Resource limits

Best Practices

  1. Error Handling

    • Detailed error context
    • Command output capture
    • Exit code handling
    • Retry mechanism

  2. Data Transfer

    • Stream integrity
    • Property preservation
    • Resume capability
    • Progress monitoring

  3. Command Construction

    • Proper flag ordering
    • Mutually exclusive options
    • Safe pipe handling
    • Sudo management

Design Decisions

  1. Architecture

    • Single piped command
    • Direct streaming
    • No temporary files
    • Native ZFS features

  2. Configuration

    • Strong typing
    • Required validations
    • Clear option mapping
    • Flexible properties

  3. Integration

    • Context support
    • Logger integration
    • Error wrapping
    • Resource tracking

Testing Strategy

pkg/zfs/dataset/data_transfer_test.go

  1. Test Categories

    • Basic transfers
    • Incremental transfers
    • Resume operations
    • Remote replication

  2. Test Infrastructure

    • Loop devices
    • Pool management
    • Dataset creation
    • Cleanup handling

Current Limitations

  1. Known Issues

    • Limited progress parsing
    • Basic SSH options
    • Simple retry logic
    • Limited bandwidth control

  2. Missing Features

    • Compression control
    • Bandwidth limiting
    • Advanced resume
    • Progress callbacks

Future Improvements

  1. Features

    1. Enhanced progress monitoring
    2. Better compression control
    3. Bandwidth management
    4. Advanced SSH options

  2. Performance

    1. Stream optimization
    2. Resource pooling
    3. Connection reuse
    4. Parallel transfers

  3. Security

    1. Certificate validation
    2. Enhanced key management
    3. Rate limiting
    4. Access control

This implementation forms the foundation for remote replication in the StrataSTOR NAS system, striving to provide enterprise-level functionality while maintaining security and reliability.