Add simple Ticket Master which pro-actively sends messages on proceedChannel

Handlers are going to wait on proceedChannel, this the initial step towards
providing priority for different set of API operations

pkg/server/api/api.go

@@ -0,0 +1,32 @@
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package api
+
+// Operation container for individual operations read by Ticket Master
+type Operation struct {
+	ProceedCh chan struct{}
+}
+
+// Minio container for API and also carries OP (operation) channel
+type Minio struct {
+	OP chan Operation
+}
+
+// New instantiate a new minio API
+func New() Minio {
+	return Minio{OP: make(chan Operation)}
+}

pkg/server/api/bucket-handlers.go

@@ -23,10 +23,7 @@ import (
 	"github.com/gorilla/mux"
 )
 
-// MinioAPI -
-type MinioAPI struct{}
-
-func (api MinioAPI) isValidOp(w http.ResponseWriter, req *http.Request, acceptsContentType contentType) bool {
+func (api Minio) isValidOp(w http.ResponseWriter, req *http.Request, acceptsContentType contentType) bool {
 	vars := mux.Vars(req)
 	bucket := vars["bucket"]
 	log.Println(bucket)
@@ -40,8 +37,17 @@ func (api MinioAPI) isValidOp(w http.ResponseWriter, req *http.Request, acceptsC
 // using the Initiate Multipart Upload request, but has not yet been completed or aborted.
 // This operation returns at most 1,000 multipart uploads in the response.
 //
-func (api MinioAPI) ListMultipartUploadsHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) ListMultipartUploadsHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
 	log.Println(acceptsContentType)
 
 	resources := getBucketMultipartResources(req.URL.Query())
@@ -60,8 +66,19 @@ func (api MinioAPI) ListMultipartUploadsHandler(w http.ResponseWriter, req *http
 // of the objects in a bucket. You can use the request parameters as selection
 // criteria to return a subset of the objects in a bucket.
 //
-func (api MinioAPI) ListObjectsHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) ListObjectsHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// verify if bucket allows this operation
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -87,7 +104,7 @@ func (api MinioAPI) ListObjectsHandler(w http.ResponseWriter, req *http.Request)
 // -----------
 // This implementation of the GET operation returns a list of all buckets
 // owned by the authenticated sender of the request.
-func (api MinioAPI) ListBucketsHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) ListBucketsHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
 	// uncomment this when we have webcli
 	// without access key credentials one cannot list buckets
@@ -95,13 +112,21 @@ func (api MinioAPI) ListBucketsHandler(w http.ResponseWriter, req *http.Request)
 	//	writeErrorResponse(w, req, AccessDenied, acceptsContentType, req.URL.Path)
 	//	return
 	// }
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
 	log.Println(acceptsContentType)
 }
 
 // PutBucketHandler - PUT Bucket
 // ----------
 // This implementation of the PUT operation creates a new bucket for authenticated request
-func (api MinioAPI) PutBucketHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) PutBucketHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
 	// uncomment this when we have webcli
 	// without access key credentials one cannot create a bucket
@@ -109,6 +134,16 @@ func (api MinioAPI) PutBucketHandler(w http.ResponseWriter, req *http.Request) {
 	// 	writeErrorResponse(w, req, AccessDenied, acceptsContentType, req.URL.Path)
 	//	return
 	// }
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	if isRequestBucketACL(req.URL.Query()) {
 		api.PutBucketACLHandler(w, req)
 		return
@@ -128,8 +163,19 @@ func (api MinioAPI) PutBucketHandler(w http.ResponseWriter, req *http.Request) {
 // PutBucketACLHandler - PUT Bucket ACL
 // ----------
 // This implementation of the PUT operation modifies the bucketACL for authenticated request
-func (api MinioAPI) PutBucketACLHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) PutBucketACLHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// read from 'x-amz-acl'
 	aclType := getACLType(req)
 	if aclType == unsupportedACLType {
@@ -148,8 +194,17 @@ func (api MinioAPI) PutBucketACLHandler(w http.ResponseWriter, req *http.Request
 // The operation returns a 200 OK if the bucket exists and you
 // have permission to access it. Otherwise, the operation might
 // return responses such as 404 Not Found and 403 Forbidden.
-func (api MinioAPI) HeadBucketHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) HeadBucketHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
 	log.Println(acceptsContentType)
 
 	vars := mux.Vars(req)

pkg/server/api/object-handlers.go

@@ -36,8 +36,19 @@ const (
 // ----------
 // This implementation of the GET operation retrieves object. To use GET,
 // you must have READ access to the object.
-func (api MinioAPI) GetObjectHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) GetObjectHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// verify if this operation is allowed
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -54,8 +65,19 @@ func (api MinioAPI) GetObjectHandler(w http.ResponseWriter, req *http.Request) {
 // HeadObjectHandler - HEAD Object
 // -----------
 // The HEAD operation retrieves metadata from an object without returning the object itself.
-func (api MinioAPI) HeadObjectHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) HeadObjectHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// verify if this operation is allowed
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -71,8 +93,19 @@ func (api MinioAPI) HeadObjectHandler(w http.ResponseWriter, req *http.Request)
 // PutObjectHandler - PUT Object
 // ----------
 // This implementation of the PUT operation adds an object to a bucket.
-func (api MinioAPI) PutObjectHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) PutObjectHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// verify if this operation is allowed
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -121,8 +154,19 @@ func (api MinioAPI) PutObjectHandler(w http.ResponseWriter, req *http.Request) {
 /// Multipart API
 
 // NewMultipartUploadHandler - New multipart upload
-func (api MinioAPI) NewMultipartUploadHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) NewMultipartUploadHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// handle ACL's here at bucket level
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -141,8 +185,19 @@ func (api MinioAPI) NewMultipartUploadHandler(w http.ResponseWriter, req *http.R
 }
 
 // PutObjectPartHandler - Upload part
-func (api MinioAPI) PutObjectPartHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) PutObjectPartHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// handle ACL's here at bucket level
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -190,8 +245,19 @@ func (api MinioAPI) PutObjectPartHandler(w http.ResponseWriter, req *http.Reques
 }
 
 // AbortMultipartUploadHandler - Abort multipart upload
-func (api MinioAPI) AbortMultipartUploadHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) AbortMultipartUploadHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// handle ACL's here at bucket level
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -206,8 +272,19 @@ func (api MinioAPI) AbortMultipartUploadHandler(w http.ResponseWriter, req *http
 }
 
 // ListObjectPartsHandler - List object parts
-func (api MinioAPI) ListObjectPartsHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) ListObjectPartsHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// handle ACL's here at bucket level
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -225,8 +302,19 @@ func (api MinioAPI) ListObjectPartsHandler(w http.ResponseWriter, req *http.Requ
 }
 
 // CompleteMultipartUploadHandler - Complete multipart upload
-func (api MinioAPI) CompleteMultipartUploadHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) CompleteMultipartUploadHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
+
+	op := Operation{}
+	op.ProceedCh = make(chan struct{})
+	api.OP <- op
+	// block until Ticket master gives us a go
+	<-op.ProceedCh
+	{
+		// do you operation
+	}
+	log.Println(acceptsContentType)
+
 	// handle ACL's here at bucket level
 	if !api.isValidOp(w, req, acceptsContentType) {
 		return
@@ -262,13 +350,13 @@ func (api MinioAPI) CompleteMultipartUploadHandler(w http.ResponseWriter, req *h
 /// Delete API
 
 // DeleteBucketHandler - Delete bucket
-func (api MinioAPI) DeleteBucketHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) DeleteBucketHandler(w http.ResponseWriter, req *http.Request) {
 	error := getErrorCode(NotImplemented)
 	w.WriteHeader(error.HTTPStatusCode)
 }
 
 // DeleteObjectHandler - Delete object
-func (api MinioAPI) DeleteObjectHandler(w http.ResponseWriter, req *http.Request) {
+func (api Minio) DeleteObjectHandler(w http.ResponseWriter, req *http.Request) {
 	error := getErrorCode(NotImplemented)
 	w.WriteHeader(error.HTTPStatusCode)
 }

pkg/server/router.go

@@ -24,28 +24,31 @@ import (
 	"github.com/minio/minio/pkg/server/rpc"
 )
 
+func getAPI() api.Minio {
+	a := api.New()
+	return a
+}
+
 // registerAPI - register all the object API handlers to their respective paths
-func registerAPI(mux *router.Router) http.Handler {
-	api := api.MinioAPI{}
-
-	mux.HandleFunc("/", api.ListBucketsHandler).Methods("GET")
-	mux.HandleFunc("/{bucket}", api.ListObjectsHandler).Methods("GET")
-	mux.HandleFunc("/{bucket}", api.PutBucketHandler).Methods("PUT")
-	mux.HandleFunc("/{bucket}", api.HeadBucketHandler).Methods("HEAD")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.HeadObjectHandler).Methods("HEAD")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.PutObjectPartHandler).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").Methods("PUT")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.ListObjectPartsHandler).Queries("uploadId", "{uploadId:.*}").Methods("GET")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.CompleteMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}").Methods("POST")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.NewMultipartUploadHandler).Methods("POST")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.AbortMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}").Methods("DELETE")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.GetObjectHandler).Methods("GET")
-	mux.HandleFunc("/{bucket}/{object:.*}", api.PutObjectHandler).Methods("PUT")
+func registerAPI(mux *router.Router, a api.Minio) http.Handler {
+	mux.HandleFunc("/", a.ListBucketsHandler).Methods("GET")
+	mux.HandleFunc("/{bucket}", a.ListObjectsHandler).Methods("GET")
+	mux.HandleFunc("/{bucket}", a.PutBucketHandler).Methods("PUT")
+	mux.HandleFunc("/{bucket}", a.HeadBucketHandler).Methods("HEAD")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.HeadObjectHandler).Methods("HEAD")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.PutObjectPartHandler).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").Methods("PUT")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.ListObjectPartsHandler).Queries("uploadId", "{uploadId:.*}").Methods("GET")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.CompleteMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}").Methods("POST")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.NewMultipartUploadHandler).Methods("POST")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.AbortMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}").Methods("DELETE")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.GetObjectHandler).Methods("GET")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.PutObjectHandler).Methods("PUT")
 
 	// not implemented yet
-	mux.HandleFunc("/{bucket}", api.DeleteBucketHandler).Methods("DELETE")
+	mux.HandleFunc("/{bucket}", a.DeleteBucketHandler).Methods("DELETE")
 
 	// unsupported API
-	mux.HandleFunc("/{bucket}/{object:.*}", api.DeleteObjectHandler).Methods("DELETE")
+	mux.HandleFunc("/{bucket}/{object:.*}", a.DeleteObjectHandler).Methods("DELETE")
 
 	return mux
 }
@@ -102,9 +105,12 @@ func registerRPC(mux *router.Router, s *rpc.Server) http.Handler {
 }
 
 // getAPIHandler api handler
-func getAPIHandler(conf api.Config) http.Handler {
+func getAPIHandler(conf api.Config) (http.Handler, api.Minio) {
 	mux := router.NewRouter()
-	return registerOtherMiddleware(registerAPI(mux), conf)
+	minioAPI := getAPI()
+	apiHandler := registerAPI(mux, minioAPI)
+	apiHandler = registerOtherMiddleware(apiHandler, conf)
+	return apiHandler, minioAPI
 }
 
 // getRPCHandler rpc handler

pkg/server/server.go

@@ -25,13 +25,13 @@ import (
 	"github.com/minio/minio/pkg/server/api"
 )
 
-func startAPI(errCh chan error, conf api.Config) {
+func startAPI(errCh chan error, conf api.Config, apiHandler http.Handler) {
 	defer close(errCh)
 
 	// Minio server config
 	httpServer := &http.Server{
 		Addr:           conf.Address,
-		Handler:        getAPIHandler(conf),
+		Handler:        apiHandler,
 		MaxHeaderBytes: 1 << 20,
 	}
 
@@ -74,20 +74,24 @@ func startAPI(errCh chan error, conf api.Config) {
 	}
 }
 
-func startRPC(errCh chan error) {
+func startRPC(errCh chan error, rpcHandler http.Handler) {
 	defer close(errCh)
 
 	// Minio server config
 	httpServer := &http.Server{
 		Addr:           "127.0.0.1:9001", // TODO make this configurable
-		Handler:        getRPCHandler(),
+		Handler:        rpcHandler,
 		MaxHeaderBytes: 1 << 20,
 	}
 	errCh <- httpServer.ListenAndServe()
 }
 
-func startTM(errCh chan error) {
-	defer close(errCh)
+func startTM(a api.Minio) {
+	for {
+		for op := range a.OP {
+			close(op.ProceedCh)
+		}
+	}
 }
 
 // StartServices starts basic services for a server
@@ -95,8 +99,11 @@ func StartServices(conf api.Config) error {
 	apiErrCh := make(chan error)
 	rpcErrCh := make(chan error)
 
-	go startAPI(apiErrCh, conf)
-	go startRPC(rpcErrCh)
+	apiHandler, minioAPI := getAPIHandler(conf)
+	go startAPI(apiErrCh, conf, apiHandler)
+	rpcHandler := getRPCHandler()
+	go startRPC(rpcErrCh, rpcHandler)
+	go startTM(minioAPI)
 
 	select {
 	case err := <-apiErrCh: