mtsatellite/cmd/mtredisalize/changetracker.go
Sascha L. Teichmann f4c188a87a mtredisalize: Do the actual change tracking, store them in a map and serialize them to JSON when flushing is triggered.
TODO: Implement the POST request to the remote host with this JSON document.
2014-09-17 10:16:51 +02:00

62 lines
1.3 KiB
Go

package main
import (
"encoding/json"
"log"
"sync"
"bitbucket.org/s_l_teichmann/mtredisalize/common"
)
type quantizedXZ struct {
X, Z int16
}
type ChangeTracker struct {
changes map[quantizedXZ]bool
mutex sync.Mutex
}
func NewChangeTracker() *ChangeTracker {
return &ChangeTracker{changes: make(map[quantizedXZ]bool)}
}
func (ct *ChangeTracker) BlockChanged(key []byte) {
var err error
var coord common.Coord
if coord, err = common.DecodeStringBytesToCoord(key); err != nil {
log.Printf("decoding key failed: %s", err)
return
}
log.Printf("changed block: %v", coord)
ct.mutex.Lock()
ct.changes[quantizedXZ{X: coord.X / 16, Z: coord.Z / 16}] = true
ct.mutex.Unlock()
}
func (ct *ChangeTracker) FlushChanges(url string) (err error) {
log.Println("change flush triggered")
var oldChanges map[quantizedXZ]bool
ct.mutex.Lock()
oldChanges = ct.changes
ct.changes = make(map[quantizedXZ]bool)
ct.mutex.Unlock()
go func() {
changes := make([]quantizedXZ, len(oldChanges))
i := 0
for change, _ := range oldChanges {
changes[i] = change
i++
}
var err error
var encoded []byte
if encoded, err = json.Marshal(changes); err != nil {
log.Printf("WARN: encode changes to JSON failed: %s", err)
return
}
// TODO: implement http POST
_ = encoded
}()
return
}