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package store
import (
"encoding/json"
"io"
"launchpad.net/juju/go/charm"
"launchpad.net/juju/go/log"
"net/http"
"strconv"
"strings"
)
// Server is an http.Handler that serves the HTTP API of juju
// so that juju clients can retrieve published charms.
type Server struct {
store *Store
mux *http.ServeMux
}
// New returns a new *Server using store.
func NewServer(store *Store) (*Server, error) {
s := &Server{
store: store,
mux: http.NewServeMux(),
}
s.mux.HandleFunc("/charm-info", func(w http.ResponseWriter, r *http.Request) {
s.serveInfo(w, r)
})
s.mux.HandleFunc("/charm/", func(w http.ResponseWriter, r *http.Request) {
s.serveCharm(w, r)
})
s.mux.HandleFunc("/stats/counter/", func(w http.ResponseWriter, r *http.Request) {
s.serveStats(w, r)
})
// This is just a validation key to allow blitz.io to run
// performance tests against the site.
s.mux.HandleFunc("/mu-35700a31-6bf320ca-a800b670-05f845ee", func(w http.ResponseWriter, r *http.Request) {
s.serveBlitzKey(w, r)
})
return s, nil
}
// ServeHTTP serves an http request.
// This method turns *Server into an http.Handler.
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" {
http.Redirect(w, r, "https://juju.ubuntu.com", http.StatusSeeOther)
return
}
s.mux.ServeHTTP(w, r)
}
func statsEnabled(req *http.Request) bool {
// It's fine to parse the form more than once, and it avoids
// bugs from not parsing it.
req.ParseForm()
return req.Form.Get("stats") != "0"
}
func charmStatsKey(curl *charm.URL, kind string) []string {
if curl.User == "" {
return []string{kind, curl.Series, curl.Name}
}
return []string{kind, curl.Series, curl.Name, curl.User}
}
func (s *Server) serveInfo(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/charm-info" {
w.WriteHeader(http.StatusNotFound)
return
}
r.ParseForm()
response := map[string]*charm.InfoResponse{}
for _, url := range r.Form["charms"] {
c := &charm.InfoResponse{}
response[url] = c
curl, err := charm.ParseURL(url)
var info *CharmInfo
if err == nil {
info, err = s.store.CharmInfo(curl)
}
var skey []string
if err == nil {
skey = charmStatsKey(curl, "charm-info")
c.Sha256 = info.BundleSha256()
c.Revision = info.Revision()
} else {
if err == ErrNotFound {
skey = charmStatsKey(curl, "charm-missing")
}
c.Errors = append(c.Errors, err.Error())
}
if skey != nil && statsEnabled(r) {
go s.store.IncCounter(skey)
}
}
data, err := json.Marshal(response)
if err == nil {
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(data)
}
if err != nil {
log.Printf("can't write content: %v", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
}
func (s *Server) serveCharm(w http.ResponseWriter, r *http.Request) {
if !strings.HasPrefix(r.URL.Path, "/charm/") {
panic("serveCharm: bad url")
}
curl, err := charm.ParseURL("cs:" + r.URL.Path[len("/charm/"):])
if err != nil {
w.WriteHeader(http.StatusNotFound)
return
}
info, rc, err := s.store.OpenCharm(curl)
if err == ErrNotFound {
w.WriteHeader(http.StatusNotFound)
return
}
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Printf("can't open charm %q: %v", curl, err)
return
}
if statsEnabled(r) {
go s.store.IncCounter(charmStatsKey(curl, "charm-bundle"))
}
defer rc.Close()
w.Header().Set("Connection", "close") // No keep-alive for now.
w.Header().Set("Content-Type", "application/octet-stream")
w.Header().Set("Content-Length", strconv.FormatInt(info.BundleSize(), 10))
_, err = io.Copy(w, rc)
if err != nil {
log.Printf("failed to stream charm %q: %v", curl, err)
}
}
func (s *Server) serveStats(w http.ResponseWriter, r *http.Request) {
// TODO: Adopt a smarter mux that simplifies this logic.
const dir = "/stats/counter/"
if !strings.HasPrefix(r.URL.Path, dir) {
panic("bad url")
}
base := r.URL.Path[len(dir):]
if strings.Index(base, "/") > 0 {
w.WriteHeader(http.StatusNotFound)
return
}
if base == "" {
w.WriteHeader(http.StatusForbidden)
return
}
key := strings.Split(base, ":")
prefix := false
if key[len(key)-1] == "*" {
prefix = true
key = key[:len(key)-1]
if len(key) == 0 {
// No point in counting something unknown.
w.WriteHeader(http.StatusForbidden)
return
}
}
r.ParseForm()
sum, err := s.store.SumCounter(key, prefix)
if err != nil {
log.Printf("can't sum counter: %v", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
data := []byte(strconv.FormatInt(sum, 10))
w.Header().Set("Content-Type", "text/plain")
w.Header().Set("Content-Length", strconv.Itoa(len(data)))
_, err = w.Write(data)
if err != nil {
log.Printf("can't write content: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
}
func (s *Server) serveBlitzKey(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Connection", "close")
w.Header().Set("Content-Type", "text/plain")
w.Header().Set("Content-Length", "2")
w.Write([]byte("42"))
}
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