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package main
import (
"crypto/tls"
"fmt"
"io"
"log"
"net/http"
"os"
"regexp"
"strconv"
_ "github.com/anacrolix/envpprof"
"github.com/anacrolix/tagflag"
"github.com/dustin/go-humanize"
"github.com/anacrolix/missinggo"
"github.com/anacrolix/missinggo/filecache"
)
var c *filecache.Cache
func handleNewData(w http.ResponseWriter, path string, offset int64, r io.Reader) (served bool) {
f, err := c.OpenFile(path, os.O_CREATE|os.O_WRONLY)
if err != nil {
log.Print(err)
http.Error(w, "couldn't open file", http.StatusInternalServerError)
return true
}
defer f.Close()
f.Seek(offset, os.SEEK_SET)
_, err = io.Copy(f, r)
if err != nil {
log.Print(err)
c.Remove(path)
http.Error(w, "didn't complete", http.StatusInternalServerError)
return true
}
return
}
// Parses out the first byte from a Content-Range header. Returns 0 if it
// isn't found, which is what is implied if there is no header.
func parseContentRangeFirstByte(s string) int64 {
matches := regexp.MustCompile(`(\d+)-`).FindStringSubmatch(s)
if matches == nil {
return 0
}
ret, _ := strconv.ParseInt(matches[1], 0, 64)
return ret
}
func handleDelete(w http.ResponseWriter, path string) {
err := c.Remove(path)
if err != nil {
log.Print(err)
http.Error(w, "didn't work", http.StatusInternalServerError)
return
}
}
func main() {
log.SetFlags(log.Flags() | log.Lshortfile)
args := struct {
Capacity tagflag.Bytes `short:"c"`
Addr string
}{
Capacity: -1,
Addr: "localhost:2076",
}
tagflag.Parse(&args)
root, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
log.Printf("cache root at %q", root)
c, err = filecache.NewCache(root)
if err != nil {
log.Fatalf("error creating cache: %s", err)
}
if args.Capacity < 0 {
log.Printf("no capacity set, no evictions will occur")
} else {
c.SetCapacity(args.Capacity.Int64())
log.Printf("setting capacity to %s bytes", humanize.Comma(args.Capacity.Int64()))
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
p := r.URL.Path[1:]
switch r.Method {
case "DELETE":
log.Printf("%s %s", r.Method, r.RequestURI)
handleDelete(w, p)
return
case "PUT", "PATCH", "POST":
contentRange := r.Header.Get("Content-Range")
firstByte := parseContentRangeFirstByte(contentRange)
log.Printf("%s (%d-) %s", r.Method, firstByte, r.RequestURI)
handleNewData(w, p, firstByte, r.Body)
return
}
log.Printf("%s %s %s", r.Method, r.Header.Get("Range"), r.RequestURI)
f, err := c.OpenFile(p, os.O_RDONLY)
if os.IsNotExist(err) {
http.NotFound(w, r)
return
}
if err != nil {
log.Printf("couldn't open requested file: %s", err)
http.Error(w, "couldn't open file", http.StatusInternalServerError)
return
}
defer func() {
go f.Close()
}()
info, _ := f.Stat()
w.Header().Set("Content-Range", fmt.Sprintf("*/%d", info.Size()))
http.ServeContent(w, r, p, info.ModTime(), f)
})
http.HandleFunc("/status", func(w http.ResponseWriter, r *http.Request) {
info := c.Info()
fmt.Fprintf(w, "Capacity: %d\n", info.Capacity)
fmt.Fprintf(w, "Current Size: %d\n", info.Filled)
fmt.Fprintf(w, "Item Count: %d\n", info.NumItems)
})
http.HandleFunc("/lru", func(w http.ResponseWriter, r *http.Request) {
c.WalkItems(func(item filecache.ItemInfo) {
fmt.Fprintf(w, "%s\t%d\t%s\n", item.Accessed, item.Size, item.Path)
})
})
cert, err := missinggo.NewSelfSignedCertificate()
if err != nil {
log.Fatal(err)
}
srv := http.Server{
Addr: args.Addr,
TLSConfig: &tls.Config{
Certificates: []tls.Certificate{cert},
},
}
log.Fatal(srv.ListenAndServeTLS("", ""))
}
|
