// Snapshot handles requests to take and restore snapshots. This uses a special
// mechanism to make the RPC since we potentially stream large amounts of data
// as part of these requests.
func (s *HTTPServer) Snapshot(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
var args structs.SnapshotRequest
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
if _, ok := req.URL.Query()["stale"]; ok {
args.AllowStale = true
}
switch req.Method {
case "GET":
args.Op = structs.SnapshotSave
// Headers need to go out before we stream the body.
replyFn := func(reply *structs.SnapshotResponse) error {
setMeta(resp, &reply.QueryMeta)
return nil
}
// Don't bother sending any request body through since it will
// be ignored.
var null bytes.Buffer
if err := s.agent.SnapshotRPC(&args, &null, resp, replyFn); err != nil {
return nil, err
}
return nil, nil
case "PUT":
args.Op = structs.SnapshotRestore
if err := s.agent.SnapshotRPC(&args, req.Body, resp, nil); err != nil {
return nil, err
}
return nil, nil
default:
resp.WriteHeader(http.StatusMethodNotAllowed)
return nil, nil
}
}
