/
client.go
202 lines (165 loc) · 6.12 KB
/
client.go
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package public
import (
"bufio"
"bytes"
"context"
"fmt"
"net/http"
"net/url"
"github.com/golang/protobuf/proto"
healthcheckPb "github.com/linkerd/linkerd2/controller/gen/common/healthcheck"
pb "github.com/linkerd/linkerd2/controller/gen/public"
"github.com/linkerd/linkerd2/pkg/k8s"
log "github.com/sirupsen/logrus"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
)
const (
apiRoot = "/" // Must be absolute (with a leading slash).
apiVersion = "v1"
apiPrefix = "api/" + apiVersion + "/" // Must be relative (without a leading slash).
)
type grpcOverHttpClient struct {
serverURL *url.URL
httpClient *http.Client
controlPlaneNamespace string
}
// TODO: This will replace Stat, once implemented
func (c *grpcOverHttpClient) StatSummary(ctx context.Context, req *pb.StatSummaryRequest, _ ...grpc.CallOption) (*pb.StatSummaryResponse, error) {
var msg pb.StatSummaryResponse
err := c.apiRequest(ctx, "StatSummary", req, &msg)
return &msg, err
}
func (c *grpcOverHttpClient) Version(ctx context.Context, req *pb.Empty, _ ...grpc.CallOption) (*pb.VersionInfo, error) {
var msg pb.VersionInfo
err := c.apiRequest(ctx, "Version", req, &msg)
return &msg, err
}
func (c *grpcOverHttpClient) SelfCheck(ctx context.Context, req *healthcheckPb.SelfCheckRequest, _ ...grpc.CallOption) (*healthcheckPb.SelfCheckResponse, error) {
var msg healthcheckPb.SelfCheckResponse
err := c.apiRequest(ctx, "SelfCheck", req, &msg)
return &msg, err
}
func (c *grpcOverHttpClient) ListPods(ctx context.Context, req *pb.ListPodsRequest, _ ...grpc.CallOption) (*pb.ListPodsResponse, error) {
var msg pb.ListPodsResponse
err := c.apiRequest(ctx, "ListPods", req, &msg)
return &msg, err
}
func (c *grpcOverHttpClient) Tap(ctx context.Context, req *pb.TapRequest, _ ...grpc.CallOption) (pb.Api_TapClient, error) {
return nil, status.Error(codes.Unimplemented, "Tap is deprecated, use TapByResource")
}
func (c *grpcOverHttpClient) TapByResource(ctx context.Context, req *pb.TapByResourceRequest, _ ...grpc.CallOption) (pb.Api_TapByResourceClient, error) {
url := c.endpointNameToPublicApiUrl("TapByResource")
httpRsp, err := c.post(ctx, url, req)
if err != nil {
return nil, err
}
if err := checkIfResponseHasError(httpRsp); err != nil {
httpRsp.Body.Close()
return nil, err
}
go func() {
<-ctx.Done()
log.Debug("Closing response body after context marked as done")
httpRsp.Body.Close()
}()
return &tapClient{ctx: ctx, reader: bufio.NewReader(httpRsp.Body)}, nil
}
func (c *grpcOverHttpClient) apiRequest(ctx context.Context, endpoint string, req proto.Message, protoResponse proto.Message) error {
url := c.endpointNameToPublicApiUrl(endpoint)
log.Debugf("Making gRPC-over-HTTP call to [%s] [%+v]", url.String(), req)
httpRsp, err := c.post(ctx, url, req)
if err != nil {
return err
}
defer httpRsp.Body.Close()
log.Debugf("gRPC-over-HTTP call returned status [%s] and content length [%d]", httpRsp.Status, httpRsp.ContentLength)
if err := checkIfResponseHasError(httpRsp); err != nil {
return err
}
reader := bufio.NewReader(httpRsp.Body)
return fromByteStreamToProtocolBuffers(reader, protoResponse)
}
func (c *grpcOverHttpClient) post(ctx context.Context, url *url.URL, req proto.Message) (*http.Response, error) {
reqBytes, err := proto.Marshal(req)
if err != nil {
return nil, err
}
httpReq, err := http.NewRequest(
http.MethodPost,
url.String(),
bytes.NewReader(reqBytes),
)
if err != nil {
return nil, err
}
rsp, err := c.httpClient.Do(httpReq.WithContext(ctx))
if err != nil {
log.Debugf("Error invoking [%s]: %v", url.String(), err)
} else {
log.Debugf("Response from [%s] had headers: %v", url.String(), rsp.Header)
}
return rsp, err
}
func (c *grpcOverHttpClient) endpointNameToPublicApiUrl(endpoint string) *url.URL {
return c.serverURL.ResolveReference(&url.URL{Path: endpoint})
}
type tapClient struct {
ctx context.Context
reader *bufio.Reader
}
func (c tapClient) Recv() (*pb.TapEvent, error) {
var msg pb.TapEvent
err := fromByteStreamToProtocolBuffers(c.reader, &msg)
return &msg, err
}
// satisfy the pb.Api_TapClient interface
func (c tapClient) Header() (metadata.MD, error) { return nil, nil }
func (c tapClient) Trailer() metadata.MD { return nil }
func (c tapClient) CloseSend() error { return nil }
func (c tapClient) Context() context.Context { return c.ctx }
func (c tapClient) SendMsg(interface{}) error { return nil }
func (c tapClient) RecvMsg(interface{}) error { return nil }
func fromByteStreamToProtocolBuffers(byteStreamContainingMessage *bufio.Reader, out proto.Message) error {
messageAsBytes, err := deserializePayloadFromReader(byteStreamContainingMessage)
if err != nil {
return fmt.Errorf("error reading byte stream header: %v", err)
}
err = proto.Unmarshal(messageAsBytes, out)
if err != nil {
return fmt.Errorf("error unmarshalling array of [%d] bytes error: %v", len(messageAsBytes), err)
}
return nil
}
func newClient(apiURL *url.URL, httpClientToUse *http.Client, controlPlaneNamespace string) (pb.ApiClient, error) {
if !apiURL.IsAbs() {
return nil, fmt.Errorf("server URL must be absolute, was [%s]", apiURL.String())
}
serverUrl := apiURL.ResolveReference(&url.URL{Path: apiPrefix})
log.Debugf("Expecting API to be served over [%s]", serverUrl)
return &grpcOverHttpClient{
serverURL: serverUrl,
httpClient: httpClientToUse,
controlPlaneNamespace: controlPlaneNamespace,
}, nil
}
func NewInternalClient(controlPlaneNamespace string, kubeAPIHost string) (pb.ApiClient, error) {
apiURL, err := url.Parse(fmt.Sprintf("http://%s/", kubeAPIHost))
if err != nil {
return nil, err
}
return newClient(apiURL, http.DefaultClient, controlPlaneNamespace)
}
func NewExternalClient(controlPlaneNamespace string, kubeAPI *k8s.KubernetesAPI) (pb.ApiClient, error) {
apiURL, err := kubeAPI.UrlFor(controlPlaneNamespace, "/services/http:api:http/proxy/")
if err != nil {
return nil, err
}
httpClientToUse, err := kubeAPI.NewClient()
if err != nil {
return nil, err
}
return newClient(apiURL, httpClientToUse, controlPlaneNamespace)
}