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prepared_query_endpoint.go
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/
prepared_query_endpoint.go
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package agent
import (
"fmt"
"net/http"
"strconv"
"strings"
"github.com/hashicorp/consul/agent/consul"
"github.com/hashicorp/consul/agent/consul/structs"
)
const (
preparedQueryExecuteSuffix = "/execute"
preparedQueryExplainSuffix = "/explain"
)
// preparedQueryCreateResponse is used to wrap the query ID.
type preparedQueryCreateResponse struct {
ID string
}
// preparedQueryCreate makes a new prepared query.
func (s *HTTPServer) preparedQueryCreate(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.PreparedQueryRequest{
Op: structs.PreparedQueryCreate,
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
if req.ContentLength > 0 {
if err := decodeBody(req, &args.Query, nil); err != nil {
resp.WriteHeader(400)
fmt.Fprintf(resp, "Request decode failed: %v", err)
return nil, nil
}
}
var reply string
if err := s.agent.RPC("PreparedQuery.Apply", &args, &reply); err != nil {
return nil, err
}
return preparedQueryCreateResponse{reply}, nil
}
// preparedQueryList returns all the prepared queries.
func (s *HTTPServer) preparedQueryList(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
var args structs.DCSpecificRequest
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
var reply structs.IndexedPreparedQueries
if err := s.agent.RPC("PreparedQuery.List", &args, &reply); err != nil {
return nil, err
}
// Use empty list instead of nil.
if reply.Queries == nil {
reply.Queries = make(structs.PreparedQueries, 0)
}
return reply.Queries, nil
}
// PreparedQueryGeneral handles all the general prepared query requests.
func (s *HTTPServer) PreparedQueryGeneral(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
switch req.Method {
case "POST":
return s.preparedQueryCreate(resp, req)
case "GET":
return s.preparedQueryList(resp, req)
default:
resp.WriteHeader(405)
return nil, nil
}
}
// parseLimit parses the optional limit parameter for a prepared query execution.
func parseLimit(req *http.Request, limit *int) error {
*limit = 0
if arg := req.URL.Query().Get("limit"); arg != "" {
i, err := strconv.Atoi(arg)
if err != nil {
return err
}
*limit = i
}
return nil
}
// preparedQueryExecute executes a prepared query.
func (s *HTTPServer) preparedQueryExecute(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.PreparedQueryExecuteRequest{
QueryIDOrName: id,
Agent: structs.QuerySource{
Node: s.agent.config.NodeName,
Datacenter: s.agent.config.Datacenter,
},
}
s.parseSource(req, &args.Source)
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := parseLimit(req, &args.Limit); err != nil {
return nil, fmt.Errorf("Bad limit: %s", err)
}
var reply structs.PreparedQueryExecuteResponse
if err := s.agent.RPC("PreparedQuery.Execute", &args, &reply); err != nil {
// We have to check the string since the RPC sheds
// the specific error type.
if err.Error() == consul.ErrQueryNotFound.Error() {
resp.WriteHeader(404)
fmt.Fprint(resp, err.Error())
return nil, nil
}
return nil, err
}
// Note that we translate using the DC that the results came from, since
// a query can fail over to a different DC than where the execute request
// was sent to. That's why we use the reply's DC and not the one from
// the args.
s.agent.TranslateAddresses(reply.Datacenter, reply.Nodes)
// Use empty list instead of nil.
if reply.Nodes == nil {
reply.Nodes = make(structs.CheckServiceNodes, 0)
}
return reply, nil
}
// preparedQueryExplain shows which query a name resolves to, the fully
// interpolated template (if it's a template), as well as additional info
// about the execution of a query.
func (s *HTTPServer) preparedQueryExplain(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.PreparedQueryExecuteRequest{
QueryIDOrName: id,
Agent: structs.QuerySource{
Node: s.agent.config.NodeName,
Datacenter: s.agent.config.Datacenter,
},
}
s.parseSource(req, &args.Source)
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := parseLimit(req, &args.Limit); err != nil {
return nil, fmt.Errorf("Bad limit: %s", err)
}
var reply structs.PreparedQueryExplainResponse
if err := s.agent.RPC("PreparedQuery.Explain", &args, &reply); err != nil {
// We have to check the string since the RPC sheds
// the specific error type.
if err.Error() == consul.ErrQueryNotFound.Error() {
resp.WriteHeader(404)
fmt.Fprint(resp, err.Error())
return nil, nil
}
return nil, err
}
return reply, nil
}
// preparedQueryGet returns a single prepared query.
func (s *HTTPServer) preparedQueryGet(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.PreparedQuerySpecificRequest{
QueryID: id,
}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
var reply structs.IndexedPreparedQueries
if err := s.agent.RPC("PreparedQuery.Get", &args, &reply); err != nil {
// We have to check the string since the RPC sheds
// the specific error type.
if err.Error() == consul.ErrQueryNotFound.Error() {
resp.WriteHeader(404)
fmt.Fprint(resp, err.Error())
return nil, nil
}
return nil, err
}
return reply.Queries, nil
}
// preparedQueryUpdate updates a prepared query.
func (s *HTTPServer) preparedQueryUpdate(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.PreparedQueryRequest{
Op: structs.PreparedQueryUpdate,
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
if req.ContentLength > 0 {
if err := decodeBody(req, &args.Query, nil); err != nil {
resp.WriteHeader(400)
fmt.Fprintf(resp, "Request decode failed: %v", err)
return nil, nil
}
}
// Take the ID from the URL, not the embedded one.
args.Query.ID = id
var reply string
if err := s.agent.RPC("PreparedQuery.Apply", &args, &reply); err != nil {
return nil, err
}
return nil, nil
}
// preparedQueryDelete deletes prepared query.
func (s *HTTPServer) preparedQueryDelete(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.PreparedQueryRequest{
Op: structs.PreparedQueryDelete,
Query: &structs.PreparedQuery{
ID: id,
},
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
var reply string
if err := s.agent.RPC("PreparedQuery.Apply", &args, &reply); err != nil {
return nil, err
}
return nil, nil
}
// PreparedQuerySpecific handles all the prepared query requests specific to a
// particular query.
func (s *HTTPServer) PreparedQuerySpecific(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
id := strings.TrimPrefix(req.URL.Path, "/v1/query/")
execute, explain := false, false
if strings.HasSuffix(id, preparedQueryExecuteSuffix) {
execute = true
id = strings.TrimSuffix(id, preparedQueryExecuteSuffix)
} else if strings.HasSuffix(id, preparedQueryExplainSuffix) {
explain = true
id = strings.TrimSuffix(id, preparedQueryExplainSuffix)
}
switch req.Method {
case "GET":
if execute {
return s.preparedQueryExecute(id, resp, req)
} else if explain {
return s.preparedQueryExplain(id, resp, req)
} else {
return s.preparedQueryGet(id, resp, req)
}
case "PUT":
return s.preparedQueryUpdate(id, resp, req)
case "DELETE":
return s.preparedQueryDelete(id, resp, req)
default:
resp.WriteHeader(405)
return nil, nil
}
}