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edges.go
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edges.go
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package api
import (
"context"
"fmt"
"sort"
"github.com/linkerd/linkerd2/pkg/k8s"
pb "github.com/linkerd/linkerd2/viz/metrics-api/gen/viz"
"github.com/prometheus/common/model"
log "github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
)
const (
edgesQuery = "sum(%s%s) by (%s, dst_%s, pod, server_id, namespace, dst_namespace, no_tls_reason)"
)
var formatMsg = map[string]string{
"disabled": "Disabled",
"loopback": "Loopback",
"no_authority_in_http_request": "No Authority In HTTP Request",
"not_http": "Not HTTP",
"not_provided_by_remote": "Not Provided By Remote",
"not_provided_by_service_discovery": "Not Provided By Service Discovery",
}
type edgeKey struct {
src string
srcNs string
dst string
dstNs string
}
func (s *grpcServer) Edges(ctx context.Context, req *pb.EdgesRequest) (*pb.EdgesResponse, error) {
log.Debugf("Edges request: %+v", req)
if req.GetSelector().GetResource() == nil {
return edgesError(req, "Edges request missing Selector Resource"), nil
}
resourceType := promResourceType(req.GetSelector().GetResource())
dstResourceType := "dst_" + resourceType
labelsOutbound := promDirectionLabels("outbound")
labelsOutboundStr := generateLabelStringWithExclusion(labelsOutbound, string(resourceType), string(dstResourceType))
query := fmt.Sprintf(edgesQuery, "tcp_open_connections", labelsOutboundStr, resourceType, resourceType)
promResult, err := s.queryProm(ctx, query)
if err != nil {
return edgesError(req, err.Error()), nil
}
edgeMap := make(map[edgeKey]*pb.Edge)
for _, sample := range promResult {
if sample.Value == 0.0 {
continue
}
key := edgeKey{
src: string(sample.Metric[resourceType]),
srcNs: string(sample.Metric[model.LabelName("namespace")]),
dst: string(sample.Metric[dstResourceType]),
dstNs: string(sample.Metric[model.LabelName("dst_namespace")]),
}
requestedNs := req.GetSelector().GetResource().GetNamespace()
if requestedNs != v1.NamespaceAll {
if requestedNs != key.srcNs && requestedNs != key.dstNs {
continue
}
}
if _, ok := edgeMap[key]; !ok {
clientID, err := s.getPodIdentity(string(sample.Metric[model.LabelName("pod")]), key.srcNs)
if err != nil {
log.Warnf("failed to get pod identity for %s: %v", sample.Metric[model.LabelName("pod")], err)
continue
}
edgeMap[key] = &pb.Edge{
Src: &pb.Resource{
Namespace: key.srcNs,
Name: key.src,
Type: string(resourceType),
},
Dst: &pb.Resource{
Namespace: key.dstNs,
Name: key.dst,
Type: string(resourceType),
},
ServerId: string(sample.Metric[model.LabelName("server_id")]),
ClientId: clientID,
NoIdentityMsg: formatMsg[string(sample.Metric[model.LabelName("no_tls_reason")])],
}
}
}
edges := []*pb.Edge{}
for _, edge := range edgeMap {
edges = append(edges, edge)
}
edges = sortEdgeRows(edges)
return &pb.EdgesResponse{
Response: &pb.EdgesResponse_Ok_{
Ok: &pb.EdgesResponse_Ok{
Edges: edges,
},
},
}, nil
}
func edgesError(req *pb.EdgesRequest, message string) *pb.EdgesResponse {
return &pb.EdgesResponse{
Response: &pb.EdgesResponse_Error{
Error: &pb.ResourceError{
Resource: req.GetSelector().GetResource(),
Error: message,
},
},
}
}
func (s *grpcServer) getPodIdentity(pod string, namespace string) (string, error) {
po, err := s.k8sAPI.Pod().Lister().Pods(namespace).Get(pod)
if err != nil {
return "", err
}
return k8s.PodIdentity(po)
}
func sortEdgeRows(rows []*pb.Edge) []*pb.Edge {
sort.Slice(rows, func(i, j int) bool {
keyI := rows[i].GetSrc().GetNamespace() + rows[i].GetDst().GetNamespace() + rows[i].GetSrc().GetName() + rows[i].GetDst().GetName()
keyJ := rows[j].GetSrc().GetNamespace() + rows[j].GetDst().GetNamespace() + rows[j].GetSrc().GetName() + rows[j].GetDst().GetName()
return keyI < keyJ
})
return rows
}