Enable partition support for peering establishment (#13772)

Prior to this the dialing side of the peering would only ever work within the default partition. This commit allows properly parsing the partition field out of the API struct request body, query param and header.

agent/peering_endpoint.go

@@ -130,6 +130,14 @@ func (s *HTTPHandlers) PeeringEstablish(resp http.ResponseWriter, req *http.Requ
 		return nil, HTTPError{StatusCode: http.StatusBadRequest, Reason: "PeeringToken is required in the payload when establishing a peering."}
 	}
 
+	var entMeta acl.EnterpriseMeta
+	if err := s.parseEntMetaPartition(req, &entMeta); err != nil {
+		return nil, err
+	}
+	if args.Partition == "" {
+		args.Partition = entMeta.PartitionOrEmpty()
+	}
+
 	out, err := s.agent.rpcClientPeering.Establish(req.Context(), args)
 	if err != nil {
 		return nil, err

api/peering.go

@@ -98,8 +98,10 @@ type PeeringEstablishRequest struct {
 	PeerName string
 	// The peering token returned from the peer's GenerateToken endpoint.
 	PeeringToken string `json:",omitempty"`
-	Datacenter   string `json:",omitempty"`
-	Token        string `json:",omitempty"`
+	// Partition to be peered.
+	Partition  string `json:",omitempty"`
+	Datacenter string `json:",omitempty"`
+	Token      string `json:",omitempty"`
 	// Meta is a mapping of some string value to any other string value
 	Meta map[string]string `json:",omitempty"`
 }

proto/pbpeering/peering.gen.go

@@ -10,6 +10,7 @@ func EstablishRequestToAPI(s *EstablishRequest, t *api.PeeringEstablishRequest)
 	}
 	t.PeerName = s.PeerName
 	t.PeeringToken = s.PeeringToken
+	t.Partition = s.Partition
 	t.Datacenter = s.Datacenter
 	t.Token = s.Token
 	t.Meta = s.Meta
@@ -20,6 +21,7 @@ func EstablishRequestFromAPI(t *api.PeeringEstablishRequest, s *EstablishRequest
 	}
 	s.PeerName = t.PeerName
 	s.PeeringToken = t.PeeringToken
+	s.Partition = t.Partition
 	s.Datacenter = t.Datacenter
 	s.Token = t.Token
 	s.Meta = t.Meta