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