345 lines
11 KiB
Go
345 lines
11 KiB
Go
package agent
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import (
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"fmt"
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"net/http"
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"strconv"
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"strings"
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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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)
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// preparedQueryCreateResponse is used to wrap the query ID.
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type preparedQueryCreateResponse struct {
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ID string
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}
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// preparedQueryCreate makes a new prepared query.
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func (s *HTTPHandlers) preparedQueryCreate(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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args := structs.PreparedQueryRequest{
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Op: structs.PreparedQueryCreate,
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}
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s.parseDC(req, &args.Datacenter)
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s.parseToken(req, &args.Token)
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if err := decodeBody(req.Body, &args.Query); err != nil {
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return nil, HTTPError{StatusCode: http.StatusBadRequest, Reason: fmt.Sprintf("Request decode failed: %v", err)}
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}
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var reply string
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if err := s.agent.RPC("PreparedQuery.Apply", &args, &reply); err != nil {
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return nil, err
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}
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return preparedQueryCreateResponse{reply}, nil
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}
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// preparedQueryList returns all the prepared queries.
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func (s *HTTPHandlers) preparedQueryList(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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var args structs.DCSpecificRequest
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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 reply structs.IndexedPreparedQueries
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defer setMeta(resp, &reply.QueryMeta)
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RETRY_ONCE:
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if err := s.agent.RPC("PreparedQuery.List", &args, &reply); 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 < reply.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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reply.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
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// Use empty list instead of nil.
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if reply.Queries == nil {
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reply.Queries = make(structs.PreparedQueries, 0)
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}
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return reply.Queries, nil
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}
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// PreparedQueryGeneral handles all the general prepared query requests.
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func (s *HTTPHandlers) PreparedQueryGeneral(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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switch req.Method {
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case "POST":
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return s.preparedQueryCreate(resp, req)
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case "GET":
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return s.preparedQueryList(resp, req)
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default:
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return nil, MethodNotAllowedError{req.Method, []string{"GET", "POST"}}
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}
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}
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// parseLimit parses the optional limit parameter for a prepared query execution.
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func parseLimit(req *http.Request, limit *int) error {
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*limit = 0
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if arg := req.URL.Query().Get("limit"); arg != "" {
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i, err := strconv.Atoi(arg)
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if err != nil {
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return err
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}
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*limit = i
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}
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return nil
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}
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// preparedQueryExecute executes a prepared query.
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func (s *HTTPHandlers) preparedQueryExecute(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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args := structs.PreparedQueryExecuteRequest{
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QueryIDOrName: id,
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Agent: structs.QuerySource{
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Node: s.agent.config.NodeName,
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NodePartition: s.agent.config.PartitionOrEmpty(),
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Datacenter: s.agent.config.Datacenter,
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Segment: s.agent.config.SegmentName,
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},
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}
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s.parseSource(req, &args.Source)
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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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if err := parseLimit(req, &args.Limit); err != nil {
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return nil, fmt.Errorf("Bad limit: %s", err)
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}
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params := req.URL.Query()
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if raw := params.Get("connect"); raw != "" {
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val, err := strconv.ParseBool(raw)
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if err != nil {
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return nil, fmt.Errorf("Error parsing 'connect' value: %s", err)
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}
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args.Connect = val
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}
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var reply structs.PreparedQueryExecuteResponse
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defer setMeta(resp, &reply.QueryMeta)
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if args.QueryOptions.UseCache {
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raw, m, err := s.agent.cache.Get(req.Context(), cachetype.PreparedQueryName, &args)
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if err != nil {
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// Don't return error if StaleIfError is set and we are within it and had
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// a cached value.
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if raw != nil && m.Hit && args.QueryOptions.StaleIfError > m.Age {
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// Fall through to the happy path below
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} else {
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return nil, err
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}
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}
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defer setCacheMeta(resp, &m)
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r, ok := raw.(*structs.PreparedQueryExecuteResponse)
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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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reply = *r
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} else {
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RETRY_ONCE:
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if err := s.agent.RPC("PreparedQuery.Execute", &args, &reply); err != nil {
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// We have to check the string since the RPC sheds
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// the specific error type.
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if structs.IsErrQueryNotFound(err) {
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return nil, HTTPError{StatusCode: http.StatusNotFound, Reason: err.Error()}
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}
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return nil, err
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}
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if args.QueryOptions.AllowStale && args.MaxStaleDuration > 0 && args.MaxStaleDuration < reply.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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reply.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
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// Note that we translate using the DC that the results came from, since
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// a query can fail over to a different DC than where the execute request
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// was sent to. That's why we use the reply's DC and not the one from
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// the args.
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s.agent.TranslateAddresses(reply.Datacenter, reply.Nodes, TranslateAddressAcceptAny)
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// Use empty list instead of nil.
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if reply.Nodes == nil {
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reply.Nodes = make(structs.CheckServiceNodes, 0)
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}
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return reply, nil
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}
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// preparedQueryExplain shows which query a name resolves to, the fully
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// interpolated template (if it's a template), as well as additional info
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// about the execution of a query.
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func (s *HTTPHandlers) preparedQueryExplain(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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args := structs.PreparedQueryExecuteRequest{
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QueryIDOrName: id,
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Agent: structs.QuerySource{
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Node: s.agent.config.NodeName,
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NodePartition: s.agent.config.PartitionOrEmpty(),
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Datacenter: s.agent.config.Datacenter,
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Segment: s.agent.config.SegmentName,
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},
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}
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s.parseSource(req, &args.Source)
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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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if err := parseLimit(req, &args.Limit); err != nil {
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return nil, fmt.Errorf("Bad limit: %s", err)
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}
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var reply structs.PreparedQueryExplainResponse
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defer setMeta(resp, &reply.QueryMeta)
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RETRY_ONCE:
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if err := s.agent.RPC("PreparedQuery.Explain", &args, &reply); err != nil {
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// We have to check the string since the RPC sheds
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// the specific error type.
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if structs.IsErrQueryNotFound(err) {
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return nil, HTTPError{StatusCode: http.StatusNotFound, Reason: err.Error()}
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}
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return nil, err
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}
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if args.QueryOptions.AllowStale && args.MaxStaleDuration > 0 && args.MaxStaleDuration < reply.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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reply.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
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return reply, nil
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}
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// preparedQueryGet returns a single prepared query.
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func (s *HTTPHandlers) preparedQueryGet(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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args := structs.PreparedQuerySpecificRequest{
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QueryID: id,
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}
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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 reply structs.IndexedPreparedQueries
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defer setMeta(resp, &reply.QueryMeta)
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RETRY_ONCE:
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if err := s.agent.RPC("PreparedQuery.Get", &args, &reply); err != nil {
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// We have to check the string since the RPC sheds
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// the specific error type.
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if structs.IsErrQueryNotFound(err) {
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return nil, HTTPError{StatusCode: http.StatusNotFound, Reason: err.Error()}
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}
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return nil, err
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}
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if args.QueryOptions.AllowStale && args.MaxStaleDuration > 0 && args.MaxStaleDuration < reply.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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reply.ConsistencyLevel = args.QueryOptions.ConsistencyLevel()
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return reply.Queries, nil
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}
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// preparedQueryUpdate updates a prepared query.
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func (s *HTTPHandlers) preparedQueryUpdate(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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args := structs.PreparedQueryRequest{
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Op: structs.PreparedQueryUpdate,
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}
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s.parseDC(req, &args.Datacenter)
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s.parseToken(req, &args.Token)
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if req.ContentLength > 0 {
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if err := decodeBody(req.Body, &args.Query); err != nil {
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return nil, HTTPError{StatusCode: http.StatusBadRequest, Reason: fmt.Sprintf("Request decode failed: %v", err)}
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}
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}
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if args.Query == nil {
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args.Query = &structs.PreparedQuery{}
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}
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// Take the ID from the URL, not the embedded one.
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args.Query.ID = id
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var reply string
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if err := s.agent.RPC("PreparedQuery.Apply", &args, &reply); err != nil {
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return nil, err
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}
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return nil, nil
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}
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// preparedQueryDelete deletes prepared query.
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func (s *HTTPHandlers) preparedQueryDelete(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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args := structs.PreparedQueryRequest{
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Op: structs.PreparedQueryDelete,
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Query: &structs.PreparedQuery{
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ID: id,
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},
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}
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s.parseDC(req, &args.Datacenter)
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s.parseToken(req, &args.Token)
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var reply string
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if err := s.agent.RPC("PreparedQuery.Apply", &args, &reply); err != nil {
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return nil, err
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}
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return nil, nil
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}
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// PreparedQuerySpecificOptions handles OPTIONS requests to prepared query endpoints.
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func (s *HTTPHandlers) preparedQuerySpecificOptions(resp http.ResponseWriter, req *http.Request) interface{} {
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path := req.URL.Path
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switch {
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case strings.HasSuffix(path, "/execute"):
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resp.Header().Add("Allow", strings.Join([]string{"OPTIONS", "GET"}, ","))
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return resp
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case strings.HasSuffix(path, "/explain"):
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resp.Header().Add("Allow", strings.Join([]string{"OPTIONS", "GET"}, ","))
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return resp
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default:
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resp.Header().Add("Allow", strings.Join([]string{"OPTIONS", "GET", "PUT", "DELETE"}, ","))
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return resp
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}
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}
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// PreparedQuerySpecific handles all the prepared query requests specific to a
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// particular query.
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func (s *HTTPHandlers) PreparedQuerySpecific(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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if req.Method == "OPTIONS" {
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return s.preparedQuerySpecificOptions(resp, req), nil
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}
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path := req.URL.Path
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id := strings.TrimPrefix(path, "/v1/query/")
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switch {
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case strings.HasSuffix(path, "/execute"):
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if req.Method != "GET" {
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return nil, MethodNotAllowedError{req.Method, []string{"GET"}}
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}
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id = strings.TrimSuffix(id, "/execute")
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return s.preparedQueryExecute(id, resp, req)
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case strings.HasSuffix(path, "/explain"):
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if req.Method != "GET" {
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return nil, MethodNotAllowedError{req.Method, []string{"GET"}}
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}
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id = strings.TrimSuffix(id, "/explain")
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return s.preparedQueryExplain(id, resp, req)
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default:
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switch req.Method {
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case "GET":
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return s.preparedQueryGet(id, resp, req)
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case "PUT":
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return s.preparedQueryUpdate(id, resp, req)
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case "DELETE":
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return s.preparedQueryDelete(id, resp, req)
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default:
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return nil, MethodNotAllowedError{req.Method, []string{"GET", "PUT", "DELETE"}}
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}
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}
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}
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