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feat(cluster): initial commit for scale-out cluster
Signed-off-by: Ramkumar Chinchani <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package cluster | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| "github.com/dchest/siphash" | ||
|
|
||
| "zotregistry.io/zot/pkg/api" | ||
| "zotregistry.io/zot/pkg/api/constants" | ||
| zreg "zotregistry.io/zot/pkg/regexp" | ||
| ) | ||
|
|
||
| type ProxyRouteHandler struct { | ||
| c *api.Controller | ||
| } | ||
|
|
||
| func NewRouteHandler(c *api.Controller) *RouteHandler { | ||
| rh := &ProxyRouteHandler{c: c} | ||
| rh.SetupRoutes() | ||
|
|
||
| // FIXME: this is a scale-out load balancer cluster so doesn't do replicas | ||
|
|
||
| return rh | ||
| } | ||
|
|
||
| func (rh *ProxyRouteHandler) SetupRoutes() { | ||
| prefixedRouter := rh.c.Router.PathPrefix(constants.RoutePrefix).Subrouter() | ||
| prefixedDistSpecRouter := prefixedRouter.NewRoute().Subrouter() | ||
|
|
||
| prefixedDistSpecRouter.HandleFunc(fmt.Sprintf("/{name:%s}/", zreg.NameRegexp.String()), proxyRequestResponse(rh.c.Config)()) | ||
| } | ||
|
|
||
| func proxyRequestResponse(config rh.c.Config) func(http.HandlerFunc) http.HandlerFunc { | ||
| return func(next http.HandlerFunc) http.HandlerFunc { | ||
| return http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) { | ||
| // if no cluster or single-node cluster, handle locally | ||
| if config.Cluster == nil || len(config.Cluster.Members) { | ||
| next.ServeHTTP(response, request) | ||
| } | ||
|
|
||
| vars := mux.Vars(request) | ||
|
|
||
| name, ok := vars["name"] | ||
|
|
||
| if !ok || name == "" { | ||
| response.WriteHeader(http.StatusNotFound) | ||
|
|
||
| return | ||
| } | ||
|
|
||
| h := siphash.New(key) | ||
| h.Write([]byte(name) | ||
| sum64 := h.Sum64(nil) | ||
|
|
||
| member := config.Cluster.Members[sum64%len(config.Cluster.Members)] | ||
| /* | ||
| if member == localMember { | ||
| next.ServeHTTP(response, request) | ||
| } | ||
| */ | ||
| handleHTTP(response, request) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| type ClusterConfig { | ||
| Members string[] | ||
| HashKey string | ||
| } | ||
|
|
||
| func handleHTTP(w http.ResponseWriter, req *http.Request) { | ||
| resp, err := http.DefaultTransport.RoundTrip(req) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusServiceUnavailable) | ||
| return | ||
| } | ||
| defer resp.Body.Close() | ||
| copyHeader(w.Header(), resp.Header) | ||
| w.WriteHeader(resp.StatusCode) | ||
| io.Copy(w, resp.Body) | ||
| } | ||
|
|
||
| func copyHeader(dst, src http.Header) { | ||
| for k, vv := range src { | ||
| for _, v := range vv { | ||
| dst.Add(k, v) | ||
| } | ||
| } | ||
| } |