/*
MapRaw returns a Raw struct which can be used for drawing SVG maps e.g.,
raw, err := wm.MapRaw(bbox, width)
b := bytes.Buffer
b.WriteString(`<?xml version="1.0"?>`)
b.WriteString(fmt.Sprintf("<svg viewBox=\"0 0 %d %d\" xmlns=\"http://www.w3.org/2000/svg\">",
raw.Width, raw.Height))
b.WriteString(fmt.Sprintf("<rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" style=\"fill: azure\"/>", raw.Width, raw.Height))
b.WriteString(fmt.Sprintf("<path style=\"fill: wheat; stroke-width: 1; stroke-linejoin: round; stroke: lightslategrey\" d=\"%s\"/>", raw.Land))
b.WriteString(fmt.Sprintf("<path style=\"fill: azure; stroke-width: 1; stroke-linejoin: round; stroke: lightslategrey\" d=\"%s\"/>", raw.Lakes))
b.WriteString("</svg>")
The other properties can be used to scale and translate for drawing on the map e.g.,
type point struct {
latitude, longitude float64
x, y float64
}
// create pts []point with x,y, set to EPSG3857 and latitude longitude EPSG4326
// range of pts ...
switch raw.CrossesCentral && p.longitude > -180.0 && p.longitude < 0.0 {
case true:
p.x = (p.x + map180.Width3857 - raw.LLX) * raw.DX
p.y = (p.y - math.Abs(raw.YShift)) * raw.DX
case false:
p.x = (p.x - math.Abs(raw.XShift)) * raw.DX
p.y = (p.y - math.Abs(raw.YShift)) * raw.DX
}
// draw p on SVG.
*/
func (w *Map180) MapRaw(boundingBox string, width int) (mr Raw, err error) {
var b bbox
if b, err = newBbox(boundingBox); err != nil {
return
}
var m map3857
if m, err = b.newMap3857(width); err != nil {
return
}
mr.Height = m.height
mr.Width = m.width
mr.DX = m.dx
mr.CrossesCentral = m.crossesCentral
mr.LLX = m.llx
mr.YShift = m.yshift
mr.XShift = m.xshift
// Get the land and lakes layers from the cache. This creates them
// if they haven't been cached already.
if err = landLayers.Get(nil, m.toKey(), groupcache.StringSink(&mr.Land)); err != nil {
return
}
if err = lakeLayers.Get(nil, m.toKey(), groupcache.StringSink(&mr.Lakes)); err != nil {
return
}
return
}
func proxyHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("content-type", "application/json")
url := "http://moapi.com:8080" + r.URL.Path + "?" + r.URL.RawQuery
var s string
stringcache.Get(nil, url, groupcache.StringSink(&s))
fmt.Fprintf(w, s)
}
func (c *groupCacheMgr) GetValue(request *api.ValueRequest) {
log.WithField("domain", request.Key).Info("GroupCache:GetValue")
var value string
err := c.group.Get(request, request.Key, gc.StringSink(&value))
log.WithFields(log.Fields{
"domain": request.Key,
"value": value,
}).Info("GroupCache:GetValue:Get")
// send response to client
request.Response <- api.NewValueResponse(value, err)
close(request.Response)
log.WithField("domain", request.Key).Info("GroupCache:GetValue:Done")
}
func main() {
// setup group
stringGroup = gc.NewGroup(stringGroupName, cacheSize, gc.GetterFunc(func(_ gc.Context, key string, dest gc.Sink) error {
fmt.Fprintf(os.Stdout, "Setting cache key: %s\n", key)
return dest.SetString("ECHO:" + key)
}))
// Get Items
for j := 0; j < 4; j++ {
for i := 0; i < 4; i++ {
var s string
if err := stringGroup.Get(dummyCtx, "TestCaching-key"+strconv.Itoa(i), gc.StringSink(&s)); err != nil {
fmt.Fprintf(os.Stdout, "TestCaching-key value: failed%s\n", err)
return
}
fmt.Fprintf(os.Stdout, "TestCaching-key value:%s\n", s)
}
fmt.Fprintln(os.Stdout, "---")
}
fmt.Fprintln(os.Stdout, "Done.")
}
func QR(w http.ResponseWriter, req *http.Request) {
locals := make(map[string]string)
locals["s"] = req.FormValue("s")
if len(locals["s"]) > 0 {
var value string
if err := cg.Get(nil, locals["s"], gc.StringSink(&value)); err != nil {
fmt.Printf("err: %v\n", err)
}
locals["image"] = value
}
templ.Execute(w, locals)
// show groupcache stats
fmt.Printf("####### Stats ######")
fmt.Printf("Group Stats:\n")
fmt.Printf(" Gets: %d\n", cg.Stats.Gets)
fmt.Printf(" CacheHits: %d\n", cg.Stats.CacheHits)
fmt.Printf(" PeerLoads: %d\n", cg.Stats.PeerLoads)
fmt.Printf(" PeerErrors: %d\n", cg.Stats.PeerErrors)
fmt.Printf(" Loads: %d\n", cg.Stats.Loads)
fmt.Printf(" LoadsDeduped: %d\n", cg.Stats.LoadsDeduped)
fmt.Printf(" LocalLoads: %d\n", cg.Stats.LocalLoads)
fmt.Printf(" LocalLoadErrs: %d\n", cg.Stats.LocalLoadErrs)
fmt.Printf(" ServerRequests: %d\n", cg.Stats.ServerRequests)
}
/*
Map draws an SVG image to buf for the bbox regions. The returned map uses EPSG3857.
Width is the SVG image width in pixels (height is calculated). pts haz X Y and values
initialised for later drawing. The SVG in buf is not closed. See ValidBbox for boundingBox options.
*/
func (w *Map180) Map(boundingBox string, width int, pts Points, insetBbox string, buf *bytes.Buffer) (err error) {
// If the bbox is zero type then figure it out from the markers.
var b bbox
b, err = newBbox(boundingBox)
if err != nil {
return
}
m, err := b.newMap3857(width)
if err != nil {
return
}
buf.WriteString(`<?xml version="1.0"?>`)
buf.WriteString(fmt.Sprintf("<svg viewBox=\"0 0 %d %d\" xmlns=\"http://www.w3.org/2000/svg\">",
m.width, m.height))
if b.title != "" {
buf.WriteString(`<title>Map of ` + b.title + `.</title>`)
} else {
buf.WriteString(`<title>Map of ` + boundingBox + `.</title>`)
}
// Get the land and lakes layers from the cache. This creates them
// if they haven't been cached already.
var landLakes string
err = mapLayers.Get(nil, m.toKey(), groupcache.StringSink(&landLakes))
if err != nil {
return
}
buf.WriteString(landLakes)
if insetBbox != "" {
var inset bbox
inset, err = newBbox(insetBbox)
if err != nil {
return
}
var in map3857
in, err = inset.newMap3857(80)
if err != nil {
return
}
var insetMap string
err = mapLayers.Get(nil, in.toKey(), groupcache.StringSink(&insetMap))
if err != nil {
return
}
// use 2 markers to put a the main map bbox as a rect
ibboxul := NewMarker(b.llx, b.ury, ``, ``, ``)
err = in.marker3857(&ibboxul)
if err != nil {
return
}
ibboxlr := NewMarker(b.urx, b.lly, ``, ``, ``)
err = in.marker3857(&ibboxlr)
if err != nil {
return
}
// if bbox rect is tiny make it bigger and shift it a little.
iw := int(ibboxlr.x - ibboxul.x)
if iw < 5 {
iw = 5
ibboxul.x = ibboxul.x - 2
}
ih := int(ibboxlr.y - ibboxul.y)
if ih < 5 {
ih = 5
ibboxul.y = ibboxul.y - 2
}
buf.WriteString(fmt.Sprintf("<g transform=\"translate(10,10)\"><rect x=\"-3\" y=\"-3\" width=\"%d\" height=\"%d\" rx=\"10\" ry=\"10\" fill=\"white\"/>",
in.width+6, in.height+6))
buf.WriteString(insetMap)
buf.WriteString(fmt.Sprintf("<rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" fill=\"red\" opacity=\"0.5\"/>",
int(ibboxul.x), int(ibboxul.y), iw, ih) + `</g>`)
} // end of inset
for i, _ := range pts {
if pts[i].Latitude <= 85.0 && pts[i].Latitude >= -85.0 {
if err = m.point3857(&pts[i]); err != nil {
return
}
}
}
return
}
/*
SVG draws an SVG image showing a map of markers. The returned map uses EPSG3857.
Width is the SVG image width in pixels (height is calculated).
If boundingBox is the empty string then the map bounds are calculated from the markers.
See ValidBbox for boundingBox options.
*/
func (w *Map180) SVG(boundingBox string, width int, markers []Marker, insetBbox string) (buf bytes.Buffer, err error) {
// If the bbox is zero type then figure it out from the markers.
var b bbox
if boundingBox == "" {
b, err = newBboxFromMarkers(markers)
if err != nil {
return
}
} else {
b, err = newBbox(boundingBox)
if err != nil {
return
}
}
m, err := b.newMap3857(width)
if err != nil {
return
}
buf.WriteString(`<?xml version="1.0"?>`)
buf.WriteString(fmt.Sprintf("<svg height=\"%d\" width=\"%d\" xmlns=\"http://www.w3.org/2000/svg\">",
m.height, m.width))
if b.title != "" {
buf.WriteString(`<title>Map of ` + b.title + `.</title>`)
} else {
buf.WriteString(`<title>Map of ` + boundingBox + `.</title>`)
}
// Get the land and lakes layers from the cache. This creates them
// if they haven't been cached already.
var landLakes string
err = mapLayers.Get(nil, m.toKey(), groupcache.StringSink(&landLakes))
if err != nil {
return
}
buf.WriteString(landLakes)
if insetBbox != "" {
var inset bbox
inset, err = newBbox(insetBbox)
if err != nil {
return
}
var in map3857
in, err = inset.newMap3857(80)
if err != nil {
return
}
var insetMap string
err = mapLayers.Get(nil, in.toKey(), groupcache.StringSink(&insetMap))
if err != nil {
return
}
// use 2 markers to put a the main map bbox as a rect
ibboxul := NewMarker(b.llx, b.ury, ``, ``, ``)
err = in.marker3857(&ibboxul)
if err != nil {
return
}
ibboxlr := NewMarker(b.urx, b.lly, ``, ``, ``)
err = in.marker3857(&ibboxlr)
if err != nil {
return
}
// if bbox rect is tiny make it bigger and shift it a little.
iw := int(ibboxlr.x - ibboxul.x)
if iw < 5 {
iw = 5
ibboxul.x = ibboxul.x - 2
}
ih := int(ibboxlr.y - ibboxul.y)
if ih < 5 {
ih = 5
ibboxul.y = ibboxul.y - 2
}
buf.WriteString(fmt.Sprintf("<g transform=\"translate(10,10)\"><rect x=\"-3\" y=\"-3\" width=\"%d\" height=\"%d\" rx=\"10\" ry=\"10\" fill=\"white\"/>",
in.width+6, in.height+6))
buf.WriteString(insetMap)
buf.WriteString(fmt.Sprintf("<rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" fill=\"red\" opacity=\"0.5\"/>",
int(ibboxul.x), int(ibboxul.y), iw, ih) + `</g>`)
} // end of inset
err = m.drawMarkers(markers, &buf)
if err != nil {
return
}
var short bool
if m.width < 250 {
short = true
}
labelMarkers(markers, m.width-5, m.height-5, `end`, 12, short, &buf)
buf.WriteString("</svg>")
return
}
// Get is used by GroupCache to load a key not found in the cache
func (pc *PodAuthCache) Get(podname string) string {
var auth string
pc.cacheGroup.Get(nil, podname, groupcache.StringSink(&auth))
return auth
}
func TestGRPCPool(t *testing.T) {
if *peerChild {
beChildForTestGRPCPool()
os.Exit(0)
}
const (
nChild = 5
nGets = 5000
)
var childAddr []string
for i := 0; i < nChild; i++ {
childAddr = append(childAddr, pickFreeAddr(t))
}
var cmds []*exec.Cmd
var wg sync.WaitGroup
for i := 0; i < nChild; i++ {
cmd := exec.Command(os.Args[0],
"--test.run=TestGRPCPool",
"--test_peer_child",
"--test_peer_addrs="+strings.Join(childAddr, ","),
"--test_peer_index="+strconv.Itoa(i),
)
cmds = append(cmds, cmd)
wg.Add(1)
if err := cmd.Start(); err != nil {
t.Fatal("failed to start child process: ", err)
}
go awaitAddrReady(t, childAddr[i], &wg)
}
defer func() {
for i := 0; i < nChild; i++ {
if cmds[i].Process != nil {
cmds[i].Process.Kill()
}
}
}()
wg.Wait()
// Use a dummy self address so that we don't handle gets in-process.
p := NewGRPCPool("should-be-ignored", grpc.NewServer())
p.Set(childAddr...)
// Dummy getter function. Gets should go to children only.
// The only time this process will handle a get is when the
// children can't be contacted for some reason.
getter := groupcache.GetterFunc(func(ctx groupcache.Context, key string, dest groupcache.Sink) error {
return errors.New("parent getter called; something's wrong")
})
g := groupcache.NewGroup("grpcPoolTest", 1<<20, getter)
for _, key := range testKeys(nGets) {
var value string
if err := g.Get(nil, key, groupcache.StringSink(&value)); err != nil {
t.Fatal(err)
}
if suffix := ":" + key; !strings.HasSuffix(value, suffix) {
t.Errorf("Get(%q) = %q, want value ending in %q", key, value, suffix)
}
t.Logf("Get key=%q, value=%q (peer:key)", key, value)
}
}
func main() {
// Parse the flags
flag.Parse()
// Create a new groupcache pool
pool := groupcache.NewHTTPPool(*cachePublic)
pool.Set(strings.Split(*cachePeers, ",")...)
// Listen and serve the groupcache pool
cacheServer := http.Server{
Addr: *cacheBind,
Handler: pool,
}
go func() {
log.Printf("Starting up the cache HTTP server on address %s", *cacheBind)
err := cacheServer.ListenAndServe()
if err != nil {
log.Fatal(err)
}
}()
// Create a new groupcache pool
cache := groupcache.NewGroup("ritratt", *cacheSize, groupcache.GetterFunc(func(ctx groupcache.Context, url string, dest groupcache.Sink) error {
// First try with https
schema := "https://"
resp, err := http.Head("https://" + url)
if err != nil {
log.Printf("[https] Error while querying %s: %s", url, err)
// https doesn't work, try http
schema = "http://"
resp, err = http.Head("http://" + url)
if err != nil {
log.Printf("[http] Error while querying %s: %s", url, err)
}
}
// Content-Type of the result has to start with image/
// We also don't support SVGs, check out this link for more information:
// https://www.owasp.org/images/0/03/Mario_Heiderich_OWASP_Sweden_The_image_that_called_me.pdf
/*ct := resp.Header.Get("Content-Type")
if !strings.HasPrefix(ct, "image/") || strings.Contains(ct, "image/svg+xml") {
log.Printf("[head] Invalid Content-Type of %s", url)
return ErrInvalidContentType
}*/
// Query the proper URL, now including the body
resp, err = http.Get(schema + url)
defer resp.Body.Close()
if err != nil {
log.Printf("[get] Error while querying %s: %s", url, err)
} else {
log.Printf("[get] Loaded %s", url)
}
// Content-Type check #2
ct := resp.Header.Get("Content-Type")
if !strings.HasPrefix(ct, "image/") || strings.Contains(ct, "image/svg+xml") {
log.Printf("[get] Invalid Content-Type of %s", url)
return ErrInvalidContentType
}
var body []byte
// Read the dlenght
cls := resp.Header.Get("Content-Length")
if cls != "" {
cl, err := strconv.Atoi(cls)
if err != nil {
log.Print(err)
} else {
if cl > 25*1024*1024 {
return ErrTooBig
} else {
body, err = ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
}
}
} else {
body = []byte{}
totalRead := 0
for {
chunk := make([]byte, 1024*1024)
read, err := resp.Body.Read(chunk)
totalRead += read
if err == io.EOF {
break
}
if err != nil {
return err
}
body = append(body, chunk[:read]...)
if totalRead > 25*1024*1024 {
return ErrTooBig
}
}
}
// Put the body into cache with the Content-Type
dest.SetString(ct + ";" + string(body))
return nil
}))
log.Printf("Starting up the proxy HTTP server on address %s", *proxyBind)
proxyServer := http.Server{
Addr: *proxyBind,
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Index page
if len(r.RequestURI) < 3 || r.RequestURI[:3] != "/i/" {
w.Write([]byte("lavab/ritratt"))
return
}
// Get the data from groupcache
var data string
err := cache.Get(nil, r.RequestURI[3:], groupcache.StringSink(&data))
if err != nil {
w.Write([]byte(err.Error()))
return
}
// Split the result into two parts
parts := strings.SplitN(data, ";", 2)
// Set the content type
w.Header().Set("Content-Type", parts[0])
// Write the body
w.Write([]byte(parts[1]))
}),
}
log.Fatal(proxyServer.ListenAndServe())
}
