78 lines
1.6 KiB
Go
78 lines
1.6 KiB
Go
// Copyright 2014, 2015 by Sascha L. Teichmann
|
|
// Use of this source code is governed by the MIT license
|
|
// that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
import (
|
|
"encoding/json"
|
|
"log"
|
|
"net/http"
|
|
"sync"
|
|
|
|
"bytes"
|
|
|
|
"bitbucket.org/s_l_teichmann/mtsatellite/common"
|
|
)
|
|
|
|
// Pull up if it _really_ produces too much data.
|
|
const quantizationFactor = 1
|
|
|
|
type quantizedXZ struct {
|
|
X, Z int16
|
|
}
|
|
|
|
type changeTracker struct {
|
|
changes map[quantizedXZ]struct{}
|
|
mutex sync.Mutex
|
|
}
|
|
|
|
func newChangeTracker() *changeTracker {
|
|
return &changeTracker{changes: make(map[quantizedXZ]struct{})}
|
|
}
|
|
|
|
func (ct *changeTracker) BlockChanged(coord common.Coord) {
|
|
ct.mutex.Lock()
|
|
ct.changes[quantizedXZ{
|
|
X: coord.X / quantizationFactor,
|
|
Z: coord.Z / quantizationFactor}] = struct{}{}
|
|
ct.mutex.Unlock()
|
|
}
|
|
|
|
func (ct *changeTracker) FlushChanges(url string) {
|
|
var oldChanges map[quantizedXZ]struct{}
|
|
ct.mutex.Lock()
|
|
if len(ct.changes) > 0 {
|
|
oldChanges = ct.changes
|
|
ct.changes = make(map[quantizedXZ]struct{})
|
|
}
|
|
ct.mutex.Unlock()
|
|
if oldChanges == nil {
|
|
return
|
|
}
|
|
go func() {
|
|
changes := make([]quantizedXZ, len(oldChanges))
|
|
i := 0
|
|
for change := range oldChanges {
|
|
changes[i] = change
|
|
i++
|
|
}
|
|
var err error
|
|
var buf bytes.Buffer
|
|
encoder := json.NewEncoder(&buf)
|
|
if err = encoder.Encode(changes); err != nil {
|
|
log.Printf("WARN: encode changes to JSON failed: %s\n", err)
|
|
return
|
|
}
|
|
var resp *http.Response
|
|
resp, err = http.Post(
|
|
url, "application/json", bytes.NewBuffer(buf.Bytes()))
|
|
if resp != nil {
|
|
defer resp.Body.Close()
|
|
}
|
|
if err != nil {
|
|
log.Printf("WARN: posting changes to %s failed: %s\n", url, err)
|
|
}
|
|
}()
|
|
}
|