package agent import ( "fmt" "net/http" "time" "github.com/mitchellh/mapstructure" cachetype "github.com/hashicorp/consul/agent/cache-types" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/lib/decode" ) func (s *HTTPHandlers) DiscoveryChainRead(resp http.ResponseWriter, req *http.Request) (interface{}, error) { var args structs.DiscoveryChainRequest if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } var err error args.Name, err = getPathSuffixUnescaped(req.URL.Path, "/v1/discovery-chain/") if err != nil { return nil, err } if args.Name == "" { return nil, BadRequestError{Reason: "Missing chain name"} } args.EvaluateInDatacenter = req.URL.Query().Get("compile-dc") var entMeta structs.EnterpriseMeta if err := s.parseEntMetaNoWildcard(req, &entMeta); err != nil { return nil, err } args.WithEnterpriseMeta(&entMeta) if req.Method == "POST" { var raw map[string]interface{} if err := decodeBody(req.Body, &raw); err != nil { return nil, BadRequestError{Reason: fmt.Sprintf("Request decoding failed: %v", err)} } apiReq, err := decodeDiscoveryChainReadRequest(raw) if err != nil { return nil, BadRequestError{Reason: fmt.Sprintf("Request decoding failed: %v", err)} } args.OverrideProtocol = apiReq.OverrideProtocol args.OverrideConnectTimeout = apiReq.OverrideConnectTimeout if apiReq.OverrideMeshGateway.Mode != "" { _, err := structs.ValidateMeshGatewayMode(string(apiReq.OverrideMeshGateway.Mode)) if err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Invalid OverrideMeshGateway.Mode parameter") return nil, nil } args.OverrideMeshGateway = apiReq.OverrideMeshGateway } } // Make the RPC request var out structs.DiscoveryChainResponse defer setMeta(resp, &out.QueryMeta) if args.QueryOptions.UseCache { raw, m, err := s.agent.cache.Get(req.Context(), cachetype.CompiledDiscoveryChainName, &args) if err != nil { return nil, err } defer setCacheMeta(resp, &m) reply, ok := raw.(*structs.DiscoveryChainResponse) if !ok { // This should never happen, but we want to protect against panics return nil, fmt.Errorf("internal error: response type not correct") } out = *reply } else { RETRY_ONCE: if err := s.agent.RPC("DiscoveryChain.Get", &args, &out); err != nil { return nil, err } if args.QueryOptions.AllowStale && args.MaxStaleDuration > 0 && args.MaxStaleDuration < out.LastContact { args.AllowStale = false args.MaxStaleDuration = 0 goto RETRY_ONCE } } out.ConsistencyLevel = args.QueryOptions.ConsistencyLevel() return discoveryChainReadResponse{Chain: out.Chain}, nil } // discoveryChainReadRequest is the API variation of structs.DiscoveryChainRequest type discoveryChainReadRequest struct { OverrideMeshGateway structs.MeshGatewayConfig `alias:"override_mesh_gateway"` OverrideProtocol string `alias:"override_protocol"` OverrideConnectTimeout time.Duration `alias:"override_connect_timeout"` } // discoveryChainReadResponse is the API variation of structs.DiscoveryChainResponse type discoveryChainReadResponse struct { Chain *structs.CompiledDiscoveryChain } func decodeDiscoveryChainReadRequest(raw map[string]interface{}) (*discoveryChainReadRequest, error) { var apiReq discoveryChainReadRequest // TODO(dnephin): at this time only JSON payloads are read, so it is unlikely // that HookWeakDecodeFromSlice is necessary. It was added while porting // from lib.PatchSliceOfMaps to decode.HookWeakDecodeFromSlice. It may be // safe to remove in the future. decodeConf := &mapstructure.DecoderConfig{ DecodeHook: mapstructure.ComposeDecodeHookFunc( decode.HookWeakDecodeFromSlice, decode.HookTranslateKeys, mapstructure.StringToTimeDurationHookFunc(), ), Result: &apiReq, WeaklyTypedInput: true, } decoder, err := mapstructure.NewDecoder(decodeConf) if err != nil { return nil, err } if err := decoder.Decode(raw); err != nil { return nil, err } return &apiReq, nil }