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server.go
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server.go
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package main
import (
"context"
"log"
"net/http"
"net/url"
"os"
"os/signal"
"path"
"strconv"
"strings"
"syscall"
"time"
)
type ServerOptions struct {
Port int
Burst int
Concurrency int
HTTPCacheTTL int
HTTPReadTimeout int
HTTPWriteTimeout int
MaxAllowedSize int
MaxAllowedPixels float64
CORS bool
Gzip bool // deprecated
AuthForwarding bool
EnableURLSource bool
EnablePlaceholder bool
EnableURLSignature bool
URLSignatureKey string
Address string
PathPrefix string
APIKey string
Mount string
CertFile string
KeyFile string
Authorization string
Placeholder string
PlaceholderStatus int
ForwardHeaders []string
PlaceholderImage []byte
Endpoints Endpoints
AllowedOrigins []*url.URL
LogLevel string
ReturnSize bool
}
// Endpoints represents a list of endpoint names to disable.
type Endpoints []string
// IsValid validates if a given HTTP request endpoint is valid or not.
func (e Endpoints) IsValid(r *http.Request) bool {
parts := strings.Split(r.URL.Path, "/")
endpoint := parts[len(parts)-1]
for _, name := range e {
if endpoint == name {
return false
}
}
return true
}
func Server(o ServerOptions) {
addr := o.Address + ":" + strconv.Itoa(o.Port)
handler := NewLog(NewServerMux(o), os.Stdout, o.LogLevel)
server := &http.Server{
Addr: addr,
Handler: handler,
MaxHeaderBytes: 1 << 20,
ReadTimeout: time.Duration(o.HTTPReadTimeout) * time.Second,
WriteTimeout: time.Duration(o.HTTPWriteTimeout) * time.Second,
}
done := make(chan os.Signal, 1)
signal.Notify(done, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
go func() {
if err := listenAndServe(server, o); err != nil && err != http.ErrServerClosed {
log.Fatalf("listen: %s\n", err)
}
}()
<-done
log.Print("Graceful shutdown")
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer func() {
// extra handling here
cancel()
}()
if err := server.Shutdown(ctx); err != nil {
log.Fatalf("Server Shutdown Failed:%+v", err)
}
}
func listenAndServe(s *http.Server, o ServerOptions) error {
if o.CertFile != "" && o.KeyFile != "" {
return s.ListenAndServeTLS(o.CertFile, o.KeyFile)
}
return s.ListenAndServe()
}
func join(o ServerOptions, route string) string {
return path.Join(o.PathPrefix, route)
}
// NewServerMux creates a new HTTP server route multiplexer.
func NewServerMux(o ServerOptions) http.Handler {
mux := http.NewServeMux()
mux.Handle(join(o, "/"), Middleware(indexController(o), o))
mux.Handle(join(o, "/form"), Middleware(formController(o), o))
mux.Handle(join(o, "/health"), Middleware(healthController, o))
image := ImageMiddleware(o)
mux.Handle(join(o, "/resize"), image(Resize))
mux.Handle(join(o, "/fit"), image(Fit))
mux.Handle(join(o, "/enlarge"), image(Enlarge))
mux.Handle(join(o, "/extract"), image(Extract))
mux.Handle(join(o, "/crop"), image(Crop))
mux.Handle(join(o, "/smartcrop"), image(SmartCrop))
mux.Handle(join(o, "/rotate"), image(Rotate))
mux.Handle(join(o, "/autorotate"), image(AutoRotate))
mux.Handle(join(o, "/flip"), image(Flip))
mux.Handle(join(o, "/flop"), image(Flop))
mux.Handle(join(o, "/thumbnail"), image(Thumbnail))
mux.Handle(join(o, "/zoom"), image(Zoom))
mux.Handle(join(o, "/convert"), image(Convert))
mux.Handle(join(o, "/watermark"), image(Watermark))
mux.Handle(join(o, "/watermarkimage"), image(WatermarkImage))
mux.Handle(join(o, "/info"), image(Info))
mux.Handle(join(o, "/blur"), image(GaussianBlur))
mux.Handle(join(o, "/pipeline"), image(Pipeline))
return mux
}