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kubernetes_client_manager.go
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kubernetes_client_manager.go
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package agent
import (
"context"
"net"
"net/http"
"net/url"
"github.com/alibaba/alibabacloud-ack-connector/pkg/tcp_tunnel/base"
"github.com/alibaba/alibabacloud-ack-connector/pkg/utils"
"github.com/sirupsen/logrus"
"k8s.io/client-go/rest"
"k8s.io/client-go/transport"
)
// KubernetesClientManager manages http clients with connection to kubernetes api server.
type KubernetesClientManager struct {
base.Component
config *rest.Config
target *url.URL
}
func NewKubernetesClientManager(ctx context.Context, logger *logrus.Logger, config *rest.Config, target *url.URL) KubernetesClientManager {
return KubernetesClientManager{
Component: base.NewComponent(ctx, logger),
config: config,
target: target,
}
}
// Do function will automatically create new http client and do http request. The connection is hijacked and hold when
// response is successfully returned. If any error exists, no connection or response returned. The close of hijacked
// connection should be processed by function return value receiver.
func (kcm *KubernetesClientManager) Do(sessionID uint16, r *http.Request) (net.Conn, *http.Response, error) {
logger := kcm.Logger.WithField(base.SessionIDHeaderKey, sessionID)
transportConfig, err := kcm.config.TransportConfig()
if err != nil {
logger.Debug("cannot create transport config: ", err)
return nil, nil, err
}
tlsConfig, err := transport.TLSConfigFor(transportConfig)
if err != nil {
logger.Debug("cannot create tls config: ", err)
return nil, nil, err
}
tlsRoundTripper, err := NewTLSRoundTripper(tlsConfig, kcm.target.Host)
if err != nil {
logger.Debug("cannot create tlsRoundTripper: ", err)
return nil, nil, err
}
_transport, err := transport.HTTPWrappersForConfig(transportConfig, tlsRoundTripper)
if err != nil {
logger.Debug("cannot create transport: ", err)
return nil, nil, err
}
client := http.Client{Transport: _transport}
conn := tlsRoundTripper.Conn
utils.RedirectRequest(r, kcm.target)
logger.Trace("sending redirected request to api server: ", r.URL.String())
resp, err := client.Do(r)
if err != nil {
conn.Close()
logger.Debug("do request failed: ", err)
return nil, nil, err
}
return conn, resp, nil
}