open-consul/command/agent/coordinate_endpoint.go

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package agent
import (
"fmt"
"net/http"
"sort"
"github.com/hashicorp/consul/consul/structs"
)
// coordinateDisabled handles all the endpoints when coordinates are not enabled,
// returning an error message.
func coordinateDisabled(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
resp.WriteHeader(401)
fmt.Fprint(resp, "Coordinate support disabled")
return nil, nil
}
// sorter wraps a coordinate list and implements the sort.Interface to sort by
// node name.
type sorter struct {
coordinates structs.Coordinates
}
// See sort.Interface.
func (s *sorter) Len() int {
return len(s.coordinates)
}
// See sort.Interface.
func (s *sorter) Swap(i, j int) {
s.coordinates[i], s.coordinates[j] = s.coordinates[j], s.coordinates[i]
}
// See sort.Interface.
func (s *sorter) Less(i, j int) bool {
return s.coordinates[i].Node < s.coordinates[j].Node
}
// CoordinateDatacenters returns the WAN nodes in each datacenter, along with
// raw network coordinates.
func (s *HTTPServer) CoordinateDatacenters(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
var out []structs.DatacenterMap
if err := s.agent.RPC("Coordinate.ListDatacenters", struct{}{}, &out); err != nil {
for i := range out {
sort.Sort(&sorter{out[i].Coordinates})
}
return nil, err
}
// Use empty list instead of nil (these aren't really possible because
// Serf will give back a default coordinate and there's always one DC,
// but it's better to be explicit about what we want here).
for i := range out {
if out[i].Coordinates == nil {
out[i].Coordinates = make(structs.Coordinates, 0)
}
}
if out == nil {
out = make([]structs.DatacenterMap, 0)
}
return out, nil
}
// CoordinateNodes returns the LAN nodes in the given datacenter, along with
// raw network coordinates.
func (s *HTTPServer) CoordinateNodes(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.DCSpecificRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
var out structs.IndexedCoordinates
defer setMeta(resp, &out.QueryMeta)
if err := s.agent.RPC("Coordinate.ListNodes", &args, &out); err != nil {
sort.Sort(&sorter{out.Coordinates})
return nil, err
}
// Use empty list instead of nil.
if out.Coordinates == nil {
out.Coordinates = make(structs.Coordinates, 0)
}
return out.Coordinates, nil
}