save state in json

.gitignore

@@ -4,3 +4,4 @@ output
 map.sqlite
 tiles.sqlite
 tiles.sqlite-journal
+mapserver.json

app/config.go

@@ -3,32 +3,86 @@ package app
 import (
 	"encoding/json"
 	"io/ioutil"
+	"mapserver/coords"
 	"os"
+	"sync"
 )
 
 type Config struct {
-	Port                    int          `json:"port"`
-	EnableInitialRendering  bool         `json:"enableinitialrendering"`
-	EnableIncrementalUpdate bool         `json:"enableincrementalupdate"`
-	Webdev                  bool         `json:"webdev"`
-	WebApi                  WebApiConfig `json:"webapi"`
+	Port                    int              `json:"port"`
+	EnableInitialRendering  bool             `json:"enableinitialrendering"`
+	EnableIncrementalUpdate bool             `json:"enableincrementalupdate"`
+	Webdev                  bool             `json:"webdev"`
+	WebApi                  *WebApiConfig    `json:"webapi"`
+	RenderState             *RenderStateType `json:"renderstate"`
 }
 
 type WebApiConfig struct {
 	EnableMapblock bool `json:"enablemapblock"`
 }
 
+type RenderStateType struct {
+	//Initial rendering flag (true=still active)
+	InitialRun bool `json:"initialrun"`
+
+	//Last initial rendering coords
+	LastX int `json:"lastx"`
+	LastY int `json:"lasty"`
+	LastZ int `json:"lastz"`
+
+	//Last mtime of incremental rendering
+	LastMtime int64 `json:"lastmtime"`
+}
+
+var lock sync.Mutex
+
+const ConfigFile = "mapserver.json"
+
+func (cfg *Config) Save() error {
+	return WriteConfig(ConfigFile, cfg)
+}
+
+func WriteConfig(filename string, cfg *Config) error {
+	lock.Lock()
+	defer lock.Unlock()
+
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+
+	defer f.Close()
+
+	str, err := json.MarshalIndent(cfg, "", "	")
+	if err != nil {
+		return err
+	}
+
+	f.Write(str)
+
+	return nil
+}
+
 func ParseConfig(filename string) (*Config, error) {
 	webapi := WebApiConfig{
 		EnableMapblock: false,
 	}
 
+	rstate := RenderStateType{
+		InitialRun: true,
+		LastX:      coords.MinCoord,
+		LastY:      coords.MinCoord,
+		LastZ:      coords.MinCoord,
+		LastMtime:  0,
+	}
+
 	cfg := Config{
 		Port:                    8080,
 		EnableInitialRendering:  true,
 		EnableIncrementalUpdate: true,
 		Webdev:                  false,
-		WebApi:                  webapi,
+		WebApi:                  &webapi,
+		RenderState:             &rstate,
 	}
 
 	info, err := os.Stat(filename)

initialrenderer/job.go

@@ -4,7 +4,6 @@ import (
 	"github.com/sirupsen/logrus"
 	"mapserver/app"
 	"mapserver/coords"
-	"time"
 )
 
 func Job(ctx *app.App) {
@@ -12,7 +11,9 @@ func Job(ctx *app.App) {
 	fields := logrus.Fields{}
 	logrus.WithFields(fields).Info("Starting initial rendering")
 
-	lastcoords := coords.NewMapBlockCoords(coords.MinCoord, coords.MinCoord, coords.MinCoord)
+	rstate := ctx.Config.RenderState
+
+	lastcoords := coords.NewMapBlockCoords(rstate.LastX, rstate.LastY, rstate.LastZ)
 
 	for true {
 		newlastcoords, mblist, err := ctx.BlockAccessor.FindLegacyMapBlocks(lastcoords, 1000)
@@ -23,22 +24,29 @@ func Job(ctx *app.App) {
 
 		lastcoords = *newlastcoords
 
-		if len(mblist) == 1 {
+		if len(mblist) <= 1 {
 			logrus.Info("Initial rendering complete")
+			rstate.InitialRun = false
+			ctx.Config.Save()
+
 			break
 		}
 
 		//for _, mb := range mblist {
 		//}
 
+		//Save current positions of initial run
+		rstate.LastX = lastcoords.X
+		rstate.LastY = lastcoords.Y
+		rstate.LastZ = lastcoords.Z
+		ctx.Config.Save()
+
 		fields = logrus.Fields{
 			"count": len(mblist),
-			"X":  lastcoords.X,
-			"Y":  lastcoords.Y,
-			"Z":  lastcoords.Z,
+			"X":     lastcoords.X,
+			"Y":     lastcoords.Y,
+			"Z":     lastcoords.Z,
 		}
 		logrus.WithFields(fields).Info("Initial rendering")
-
-		time.Sleep(100 * time.Millisecond)
 	}
 }

main.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"fmt"
 	"github.com/sirupsen/logrus"
 	"mapserver/app"
@@ -34,19 +33,15 @@ func main() {
 	}
 
 	//parse Config
-	cfg, err := app.ParseConfig("mapserver.json")
+	cfg, err := app.ParseConfig(app.ConfigFile)
 	if err != nil {
 		panic(err)
 	}
 
-	if p.Dumpconfig {
-		str, err := json.MarshalIndent(cfg, "", "	")
-		if err != nil {
-			panic(err)
-		}
-
-		fmt.Println(string(str))
-		return
+	//write back config with all values
+	err = cfg.Save()
+	if err != nil {
+		panic(err)
 	}
 
 	//setup app context
@@ -58,7 +53,7 @@ func main() {
 	}
 
 	//run initial rendering
-	if ctx.Config.EnableInitialRendering {
+	if ctx.Config.EnableInitialRendering && ctx.Config.RenderState.InitialRun {
 		go initialrenderer.Job(ctx)
 	}
 

mapserver.json

@@ -1,9 +0,0 @@
-{
-	"port": 8080,
-	"enableinitialrendering": true,
-	"enableincrementalupdate": false,
-	"webdev": true,
-	"webapi": {
-		"enablemapblock": true
-	}
-}

params/params.go

@@ -16,7 +16,6 @@ func Parse() ParamsType {
 
 	flag.BoolVar(&(params.Help), "help", false, "Show help")
 	flag.BoolVar(&(params.Version), "version", false, "Show version")
-	flag.BoolVar(&(params.Dumpconfig), "dumpconfig", false, "dump mapserver.json and exit")
 	flag.BoolVar(&(params.Debug), "debug", false, "enable debug log")
 	flag.Parse()
 

tileupdate/job.go

@@ -28,6 +28,10 @@ func Job(ctx *app.App) {
 			}
 		}
 
+		rstate := ctx.Config.RenderState
+		rstate.LastMtime = t
+		ctx.Config.Save()
+
 		fields = logrus.Fields{
 			"count": len(mblist),
 			"time":  t,