[VOL-2312] Logging - Integrate voltctl with new etcd-based dynamic loglevel mechanism. Testing is in progress
Change-Id: I2e13bb79008c9a49ebb6f58e575f51efebe6dbfd
diff --git a/vendor/golang.org/x/net/proxy/dial.go b/vendor/golang.org/x/net/proxy/dial.go
new file mode 100644
index 0000000..811c2e4
--- /dev/null
+++ b/vendor/golang.org/x/net/proxy/dial.go
@@ -0,0 +1,54 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proxy
+
+import (
+ "context"
+ "net"
+)
+
+// A ContextDialer dials using a context.
+type ContextDialer interface {
+ DialContext(ctx context.Context, network, address string) (net.Conn, error)
+}
+
+// Dial works like DialContext on net.Dialer but using a dialer returned by FromEnvironment.
+//
+// The passed ctx is only used for returning the Conn, not the lifetime of the Conn.
+//
+// Custom dialers (registered via RegisterDialerType) that do not implement ContextDialer
+// can leak a goroutine for as long as it takes the underlying Dialer implementation to timeout.
+//
+// A Conn returned from a successful Dial after the context has been cancelled will be immediately closed.
+func Dial(ctx context.Context, network, address string) (net.Conn, error) {
+ d := FromEnvironment()
+ if xd, ok := d.(ContextDialer); ok {
+ return xd.DialContext(ctx, network, address)
+ }
+ return dialContext(ctx, d, network, address)
+}
+
+// WARNING: this can leak a goroutine for as long as the underlying Dialer implementation takes to timeout
+// A Conn returned from a successful Dial after the context has been cancelled will be immediately closed.
+func dialContext(ctx context.Context, d Dialer, network, address string) (net.Conn, error) {
+ var (
+ conn net.Conn
+ done = make(chan struct{}, 1)
+ err error
+ )
+ go func() {
+ conn, err = d.Dial(network, address)
+ close(done)
+ if conn != nil && ctx.Err() != nil {
+ conn.Close()
+ }
+ }()
+ select {
+ case <-ctx.Done():
+ err = ctx.Err()
+ case <-done:
+ }
+ return conn, err
+}