Remove unused code and usages of deprecated functions.

client/proxy.go

@@ -115,7 +115,7 @@ func createTransport(tlsClientConf *tls.Config, forceHTTP2 bool, extraH2ALPNs []
 			TLSClientConfig: tlsClientConf,
 		}
 		if tlsClientConf == nil {
-			transport.DialTLS = func(network, addr string, _ *tls.Config) (net.Conn, error) {
+			transport.DialTLSContext = func(_ context.Context, network, addr string, _ *tls.Config) (net.Conn, error) {
 				return net.Dial(network, addr)
 			}
 		}
@@ -151,7 +151,7 @@ func createClientProxy(endpoint string, tlsClientConf *tls.Config, forceHTTP2, f
 	return makeProxyServer(proxy)
 }
 
-// ConnectViaProxy establishes a gRPC client connection via a HTTP/2 proxy that handles endpoints behind HTTP/1.x proxies.
+// ConnectViaProxy establishes a gRPC client connection via an HTTP/2 proxy that handles endpoints behind HTTP/1.x proxies.
 // Use the WithWebSocket() ConnectOption if you want to connect to a server via WebSocket.
 // Otherwise, setting it to false will use a gRPC-Web "downgrade", as needed.
 //

internal/concurrency/do.go

@@ -18,13 +18,6 @@ import (
 	"time"
 )
 
-// Do performs the action as soon as the waitable is done.
-// It blocks indefinitely until that happens.
-func Do(w Waitable, action func()) {
-	Wait(w)
-	action()
-}
-
 // DoWithTimeout performs the action as soon as the waitable is done.
 // It gives up and returns after timeout, and returns a bool indicating whether
 // the action was performed or not.

internal/concurrency/signal.go

@@ -19,6 +19,14 @@ import (
 	"unsafe"
 )
 
+var (
+	closedCh = func() chan struct{} {
+		ch := make(chan struct{})
+		close(ch)
+		return ch
+	}()
+)
+
 // Signal implements a signalling facility. Unlike sync.Cond, it is based on channels and can hence be used
 // in `select` statements.
 // There are two ways to instantiate a Signal. The preferred way is by calling `NewSignal()`, which will return a signal

internal/concurrency/wait.go

@@ -16,12 +16,6 @@ package concurrency
 
 import "time"
 
-// Never satisfies the Waitable interface, but will never be signaled
-// Waiting will block indefinitely
-func Never() WaitableChan {
-	return WaitableChan(nil)
-}
-
 // Wait waits indefinitely until the condition represented by the given Waitable is fulfilled.
 func Wait(w Waitable) {
 	<-w.Done()
@@ -55,22 +49,3 @@ func WaitWithTimeout(w Waitable, timeout time.Duration) bool {
 		return false
 	}
 }
-
-// WaitWithDeadline waits for the given Waitable until a specified deadline. It returns false if the deadline expired
-// before the condition was fulfilled, true otherwise.
-func WaitWithDeadline(w Waitable, deadline time.Time) bool {
-	timeout := time.Until(deadline)
-	return WaitWithTimeout(w, timeout)
-}
-
-// WaitInContext waits for the given Waitable until a `parentContext` is done. Note that despite its name,
-// `parentContext` can be any waitable, not just a context.
-// It returns false if the parentContext is done first, true otherwise.
-func WaitInContext(w Waitable, parentContext Waitable) bool {
-	select {
-	case <-w.Done():
-		return true
-	case <-parentContext.Done():
-		return false
-	}
-}

internal/size/size.go

@@ -21,6 +21,4 @@ const (
 	KB = 1024 * B
 	// MB = megabyte
 	MB = 1024 * KB
-	// GB = gigabyte
-	GB = 1024 * MB
 )

server/server.go

@@ -138,7 +138,7 @@ func handleGRPCWeb(w http.ResponseWriter, req *http.Request, validPaths map[stri
 		return
 	}
 
-	// Tell the server we would accept trailers (the gRPC server currently (v1.29.1) doesn't check for this but it
+	// Tell the server we would accept trailers (the gRPC server currently (v1.29.1) doesn't check for this, but it
 	// really should, as the purpose of the TE header according to the gRPC spec is to detect incompatible proxies).
 	req.Header.Set("TE", "trailers")
 

server/websocket_writer.go

@@ -86,7 +86,7 @@ func (w *wsResponseWriter) WriteHeader(statusCode int) {
 	w.headerWritten = true
 }
 
-// Flush is a No-Op since the underlying writer is a io.PipeWriter,
+// Flush is a No-Op since the underlying writer is an io.PipeWriter,
 // which does no internal buffering.
 func (w *wsResponseWriter) Flush() {}