plumbing: transport/http, refactor transport to cache underlying transport objects

Refactor the in-built http transport to cache the underlying http
transport objects mapped to its specific options for each Git transport
object. This lets us reuse the transport for a specific set of configurations
as recommended. (ref: https://pkg.go.dev/net/http#Transport)
If there are no transport specific options provided, the default
transport is used.

Signed-off-by: Sanskar Jaiswal <jaiswalsanskar078@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/plumbing/transport/http/transport.go b/plumbing/transport/http/transport.go
new file mode 100644
index 0000000..cd6787a
--- /dev/null
+++ b/plumbing/transport/http/transport.go
@@ -0,0 +1,38 @@
+package http
+
+import (
+	"net/http"
+)
+
+// transportOptions contains transport specific configuration.
+type transportOptions struct {
+	insecureSkipTLS bool
+	// []byte is not comparable.
+	caBundle string
+}
+
+func (c *client) addTransport(opts transportOptions, transport *http.Transport) {
+	c.m.Lock()
+	c.transports.Add(opts, transport)
+	c.m.Unlock()
+}
+
+func (c *client) removeTransport(opts transportOptions) {
+	c.m.Lock()
+	c.transports.Remove(opts)
+	c.m.Unlock()
+}
+
+func (c *client) fetchTransport(opts transportOptions) (*http.Transport, bool) {
+	c.m.RLock()
+	t, ok := c.transports.Get(opts)
+	c.m.RUnlock()
+	if !ok {
+		return nil, false
+	}
+	transport, ok := t.(*http.Transport)
+	if !ok {
+		return nil, false
+	}
+	return transport, true
+}