[VOL-2193] Create mocks for Kafka Client and Etcd
This commit consists of:
1) A kafka client mock that implements the kafka client interface
under voltha-lib-go/pkg/kafka/client.go
2) An embedded Etcd server that runs in-process and represents an
Etcd server.
Change-Id: I52a36132568e08c596bb4136918bebcb654a3b99
diff --git a/vendor/github.com/tmc/grpc-websocket-proxy/LICENSE b/vendor/github.com/tmc/grpc-websocket-proxy/LICENSE
new file mode 100644
index 0000000..95d0bc8
--- /dev/null
+++ b/vendor/github.com/tmc/grpc-websocket-proxy/LICENSE
@@ -0,0 +1,7 @@
+Copyright (C) 2016 Travis Cline
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/vendor/github.com/tmc/grpc-websocket-proxy/wsproxy/doc.go b/vendor/github.com/tmc/grpc-websocket-proxy/wsproxy/doc.go
new file mode 100644
index 0000000..baf9545
--- /dev/null
+++ b/vendor/github.com/tmc/grpc-websocket-proxy/wsproxy/doc.go
@@ -0,0 +1,2 @@
+// Package wsproxy implements a websocket proxy for grpc-gateway backed services
+package wsproxy
diff --git a/vendor/github.com/tmc/grpc-websocket-proxy/wsproxy/websocket_proxy.go b/vendor/github.com/tmc/grpc-websocket-proxy/wsproxy/websocket_proxy.go
new file mode 100644
index 0000000..0fca05a
--- /dev/null
+++ b/vendor/github.com/tmc/grpc-websocket-proxy/wsproxy/websocket_proxy.go
@@ -0,0 +1,254 @@
+package wsproxy
+
+import (
+ "bufio"
+ "io"
+ "net/http"
+ "strings"
+
+ "github.com/gorilla/websocket"
+ "github.com/sirupsen/logrus"
+ "golang.org/x/net/context"
+)
+
+// MethodOverrideParam defines the special URL parameter that is translated into the subsequent proxied streaming http request's method.
+//
+// Deprecated: it is preferable to use the Options parameters to WebSocketProxy to supply parameters.
+var MethodOverrideParam = "method"
+
+// TokenCookieName defines the cookie name that is translated to an 'Authorization: Bearer' header in the streaming http request's headers.
+//
+// Deprecated: it is preferable to use the Options parameters to WebSocketProxy to supply parameters.
+var TokenCookieName = "token"
+
+// RequestMutatorFunc can supply an alternate outgoing request.
+type RequestMutatorFunc func(incoming *http.Request, outgoing *http.Request) *http.Request
+
+// Proxy provides websocket transport upgrade to compatible endpoints.
+type Proxy struct {
+ h http.Handler
+ logger Logger
+ methodOverrideParam string
+ tokenCookieName string
+ requestMutator RequestMutatorFunc
+}
+
+// Logger collects log messages.
+type Logger interface {
+ Warnln(...interface{})
+ Debugln(...interface{})
+}
+
+func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ if !websocket.IsWebSocketUpgrade(r) {
+ p.h.ServeHTTP(w, r)
+ return
+ }
+ p.proxy(w, r)
+}
+
+// Option allows customization of the proxy.
+type Option func(*Proxy)
+
+// WithMethodParamOverride allows specification of the special http parameter that is used in the proxied streaming request.
+func WithMethodParamOverride(param string) Option {
+ return func(p *Proxy) {
+ p.methodOverrideParam = param
+ }
+}
+
+// WithTokenCookieName allows specification of the cookie that is supplied as an upstream 'Authorization: Bearer' http header.
+func WithTokenCookieName(param string) Option {
+ return func(p *Proxy) {
+ p.tokenCookieName = param
+ }
+}
+
+// WithRequestMutator allows a custom RequestMutatorFunc to be supplied.
+func WithRequestMutator(fn RequestMutatorFunc) Option {
+ return func(p *Proxy) {
+ p.requestMutator = fn
+ }
+}
+
+// WithLogger allows a custom FieldLogger to be supplied
+func WithLogger(logger Logger) Option {
+ return func(p *Proxy) {
+ p.logger = logger
+ }
+}
+
+// WebsocketProxy attempts to expose the underlying handler as a bidi websocket stream with newline-delimited
+// JSON as the content encoding.
+//
+// The HTTP Authorization header is either populated from the Sec-Websocket-Protocol field or by a cookie.
+// The cookie name is specified by the TokenCookieName value.
+//
+// example:
+// Sec-Websocket-Protocol: Bearer, foobar
+// is converted to:
+// Authorization: Bearer foobar
+//
+// Method can be overwritten with the MethodOverrideParam get parameter in the requested URL
+func WebsocketProxy(h http.Handler, opts ...Option) http.Handler {
+ p := &Proxy{
+ h: h,
+ logger: logrus.New(),
+ methodOverrideParam: MethodOverrideParam,
+ tokenCookieName: TokenCookieName,
+ }
+ for _, o := range opts {
+ o(p)
+ }
+ return p
+}
+
+// TODO(tmc): allow modification of upgrader settings?
+var upgrader = websocket.Upgrader{
+ ReadBufferSize: 1024,
+ WriteBufferSize: 1024,
+ CheckOrigin: func(r *http.Request) bool { return true },
+}
+
+func isClosedConnError(err error) bool {
+ str := err.Error()
+ if strings.Contains(str, "use of closed network connection") {
+ return true
+ }
+ return websocket.IsCloseError(err, websocket.CloseNormalClosure, websocket.CloseGoingAway)
+}
+
+func (p *Proxy) proxy(w http.ResponseWriter, r *http.Request) {
+ var responseHeader http.Header
+ // If Sec-WebSocket-Protocol starts with "Bearer", respond in kind.
+ // TODO(tmc): consider customizability/extension point here.
+ if strings.HasPrefix(r.Header.Get("Sec-WebSocket-Protocol"), "Bearer") {
+ responseHeader = http.Header{
+ "Sec-WebSocket-Protocol": []string{"Bearer"},
+ }
+ }
+ conn, err := upgrader.Upgrade(w, r, responseHeader)
+ if err != nil {
+ p.logger.Warnln("error upgrading websocket:", err)
+ return
+ }
+ defer conn.Close()
+
+ ctx, cancelFn := context.WithCancel(context.Background())
+ defer cancelFn()
+
+ requestBodyR, requestBodyW := io.Pipe()
+ request, err := http.NewRequest(r.Method, r.URL.String(), requestBodyR)
+ if err != nil {
+ p.logger.Warnln("error preparing request:", err)
+ return
+ }
+ if swsp := r.Header.Get("Sec-WebSocket-Protocol"); swsp != "" {
+ request.Header.Set("Authorization", strings.Replace(swsp, "Bearer, ", "Bearer ", 1))
+ }
+ // If token cookie is present, populate Authorization header from the cookie instead.
+ if cookie, err := r.Cookie(p.tokenCookieName); err == nil {
+ request.Header.Set("Authorization", "Bearer "+cookie.Value)
+ }
+ if m := r.URL.Query().Get(p.methodOverrideParam); m != "" {
+ request.Method = m
+ }
+
+ if p.requestMutator != nil {
+ request = p.requestMutator(r, request)
+ }
+
+ responseBodyR, responseBodyW := io.Pipe()
+ response := newInMemoryResponseWriter(responseBodyW)
+ go func() {
+ <-ctx.Done()
+ p.logger.Debugln("closing pipes")
+ requestBodyW.CloseWithError(io.EOF)
+ responseBodyW.CloseWithError(io.EOF)
+ response.closed <- true
+ }()
+
+ go func() {
+ defer cancelFn()
+ p.h.ServeHTTP(response, request)
+ }()
+
+ // read loop -- take messages from websocket and write to http request
+ go func() {
+ defer func() {
+ cancelFn()
+ }()
+ for {
+ select {
+ case <-ctx.Done():
+ p.logger.Debugln("read loop done")
+ return
+ default:
+ }
+ p.logger.Debugln("[read] reading from socket.")
+ _, payload, err := conn.ReadMessage()
+ if err != nil {
+ if isClosedConnError(err) {
+ p.logger.Debugln("[read] websocket closed:", err)
+ return
+ }
+ p.logger.Warnln("error reading websocket message:", err)
+ return
+ }
+ p.logger.Debugln("[read] read payload:", string(payload))
+ p.logger.Debugln("[read] writing to requestBody:")
+ n, err := requestBodyW.Write(payload)
+ requestBodyW.Write([]byte("\n"))
+ p.logger.Debugln("[read] wrote to requestBody", n)
+ if err != nil {
+ p.logger.Warnln("[read] error writing message to upstream http server:", err)
+ return
+ }
+ }
+ }()
+ // write loop -- take messages from response and write to websocket
+ scanner := bufio.NewScanner(responseBodyR)
+ for scanner.Scan() {
+ if len(scanner.Bytes()) == 0 {
+ p.logger.Warnln("[write] empty scan", scanner.Err())
+ continue
+ }
+ p.logger.Debugln("[write] scanned", scanner.Text())
+ if err = conn.WriteMessage(websocket.TextMessage, scanner.Bytes()); err != nil {
+ p.logger.Warnln("[write] error writing websocket message:", err)
+ return
+ }
+ }
+ if err := scanner.Err(); err != nil {
+ p.logger.Warnln("scanner err:", err)
+ }
+}
+
+type inMemoryResponseWriter struct {
+ io.Writer
+ header http.Header
+ code int
+ closed chan bool
+}
+
+func newInMemoryResponseWriter(w io.Writer) *inMemoryResponseWriter {
+ return &inMemoryResponseWriter{
+ Writer: w,
+ header: http.Header{},
+ closed: make(chan bool, 1),
+ }
+}
+
+func (w *inMemoryResponseWriter) Write(b []byte) (int, error) {
+ return w.Writer.Write(b)
+}
+func (w *inMemoryResponseWriter) Header() http.Header {
+ return w.header
+}
+func (w *inMemoryResponseWriter) WriteHeader(code int) {
+ w.code = code
+}
+func (w *inMemoryResponseWriter) CloseNotify() <-chan bool {
+ return w.closed
+}
+func (w *inMemoryResponseWriter) Flush() {}