79 lines
1.4 KiB
Go
79 lines
1.4 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
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// See LICENSE for copying information.
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package main
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import (
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"bufio"
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"encoding/gob"
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"io"
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"os"
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"sync"
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"time"
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)
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// FileSource reads packets from a file
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type FileSource struct {
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path string
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mu sync.Mutex
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decoder *gob.Decoder
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}
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// NewFileSource creates a FileSource
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func NewFileSource(path string) *FileSource {
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return &FileSource{path: path}
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}
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// Next implements the Source interface
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func (f *FileSource) Next() ([]byte, time.Time, error) {
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f.mu.Lock()
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defer f.mu.Unlock()
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if f.decoder == nil {
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file, err := os.Open(f.path)
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if err != nil {
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return nil, time.Time{}, err
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}
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f.decoder = gob.NewDecoder(bufio.NewReader(file))
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}
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var p Packet
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err := f.decoder.Decode(&p)
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if err != nil {
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return nil, time.Time{}, err
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}
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return p.Data, p.TS, nil
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}
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// FileDest sends packets to a file for later processing. FileDest preserves
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// the timestamps.
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type FileDest struct {
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path string
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mu sync.Mutex
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file io.Closer
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encoder *gob.Encoder
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}
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// NewFileDest creates a FileDest
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func NewFileDest(path string) *FileDest {
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return &FileDest{path: path}
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}
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// Packet implements PacketDest
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func (f *FileDest) Packet(data []byte, ts time.Time) error {
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f.mu.Lock()
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defer f.mu.Unlock()
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if f.encoder == nil {
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file, err := os.Create(f.path)
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if err != nil {
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return err
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}
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f.file = file
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f.encoder = gob.NewEncoder(bufio.NewWriter(file))
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}
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return f.encoder.Encode(Packet{Data: data, TS: ts})
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}
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