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variable_endpoint.go
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/
variable_endpoint.go
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package agent
import (
"fmt"
"net/http"
"strconv"
"strings"
"github.com/hashicorp/nomad/nomad/structs"
)
func (s *HTTPServer) VariablesListRequest(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
if req.Method != "GET" {
return nil, CodedError(http.StatusMethodNotAllowed, ErrInvalidMethod)
}
args := structs.VariablesListRequest{}
if s.parse(resp, req, &args.Region, &args.QueryOptions) {
return nil, CodedError(http.StatusBadRequest, "failed to parse parameters")
}
var out structs.VariablesListResponse
if err := s.agent.RPC(structs.VariablesListRPCMethod, &args, &out); err != nil {
return nil, err
}
setMeta(resp, &out.QueryMeta)
if out.Data == nil {
out.Data = make([]*structs.VariableMetadata, 0)
}
return out.Data, nil
}
func (s *HTTPServer) VariableSpecificRequest(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
path := strings.TrimPrefix(req.URL.Path, "/v1/var/")
if len(path) == 0 {
return nil, CodedError(http.StatusBadRequest, "missing variable path")
}
switch req.Method {
case http.MethodGet:
return s.variableQuery(resp, req, path)
case http.MethodPut, http.MethodPost:
return s.variableUpsert(resp, req, path)
case http.MethodDelete:
return s.variableDelete(resp, req, path)
default:
return nil, CodedError(http.StatusBadRequest, ErrInvalidMethod)
}
}
func (s *HTTPServer) variableQuery(resp http.ResponseWriter, req *http.Request,
path string) (interface{}, error) {
args := structs.VariablesReadRequest{
Path: path,
}
if s.parse(resp, req, &args.Region, &args.QueryOptions) {
return nil, CodedError(http.StatusBadRequest, "failed to parse parameters")
}
var out structs.VariablesReadResponse
if err := s.agent.RPC(structs.VariablesReadRPCMethod, &args, &out); err != nil {
return nil, err
}
setMeta(resp, &out.QueryMeta)
if out.Data == nil {
return nil, CodedError(http.StatusNotFound, "variable not found")
}
return out.Data, nil
}
func (s *HTTPServer) variableUpsert(resp http.ResponseWriter, req *http.Request,
path string) (interface{}, error) {
// Parse the Variable
var Variable structs.VariableDecrypted
if err := decodeBody(req, &Variable); err != nil {
return nil, CodedError(http.StatusBadRequest, err.Error())
}
if len(Variable.Items) == 0 {
return nil, CodedError(http.StatusBadRequest, "variable missing required Items object")
}
Variable.Path = path
args := structs.VariablesApplyRequest{
Op: structs.VarOpSet,
Var: &Variable,
}
s.parseWriteRequest(req, &args.WriteRequest)
if isCas, checkIndex, err := parseCAS(req); err != nil {
return nil, err
} else if isCas {
args.Op = structs.VarOpCAS
args.Var.ModifyIndex = checkIndex
}
var out structs.VariablesApplyResponse
if err := s.agent.RPC(structs.VariablesApplyRPCMethod, &args, &out); err != nil {
// This handles the cases where there is an error in the CAS checking
// function that renders it unable to return the conflicting variable
// so it returns a text error. We can at least consider these unknown
// moments to be CAS violations
if strings.Contains(err.Error(), "cas error:") {
resp.WriteHeader(http.StatusConflict)
}
// Otherwise it's a non-CAS error
setIndex(resp, out.WriteMeta.Index)
return nil, err
}
if out.Conflict != nil {
setIndex(resp, out.Conflict.ModifyIndex)
resp.WriteHeader(http.StatusConflict)
return out.Conflict, nil
}
// Finally, we know that this is a success response, send it to the caller
setIndex(resp, out.WriteMeta.Index)
return out.Output, nil
}
func (s *HTTPServer) variableDelete(resp http.ResponseWriter, req *http.Request,
path string) (interface{}, error) {
args := structs.VariablesApplyRequest{
Op: structs.VarOpDelete,
Var: &structs.VariableDecrypted{
VariableMetadata: structs.VariableMetadata{
Path: path,
},
},
}
s.parseWriteRequest(req, &args.WriteRequest)
if isCas, checkIndex, err := parseCAS(req); err != nil {
return nil, err
} else if isCas {
args.Op = structs.VarOpDeleteCAS
args.Var.ModifyIndex = checkIndex
}
var out structs.VariablesApplyResponse
if err := s.agent.RPC(structs.VariablesApplyRPCMethod, &args, &out); err != nil {
// This handles the cases where there is an error in the CAS checking
// function that renders it unable to return the conflicting variable
// so it returns a text error. We can at least consider these unknown
// moments to be CAS violations
if strings.HasPrefix(err.Error(), "cas error:") {
resp.WriteHeader(http.StatusConflict)
}
setIndex(resp, out.WriteMeta.Index)
return nil, err
}
// If the CAS validation can decode the conflicting value, Conflict is
// non-Nil. Write out a 409 Conflict response.
if out.Conflict != nil {
setIndex(resp, out.Conflict.ModifyIndex)
resp.WriteHeader(http.StatusConflict)
return out.Conflict, nil
}
// Finally, we know that this is a success response, send it to the caller
setIndex(resp, out.WriteMeta.Index)
resp.WriteHeader(http.StatusNoContent)
return nil, nil
}
func parseCAS(req *http.Request) (bool, uint64, error) {
if cq := req.URL.Query().Get("cas"); cq != "" {
ci, err := strconv.ParseUint(cq, 10, 64)
if err != nil {
return true, 0, CodedError(http.StatusBadRequest, fmt.Sprintf("can not parse cas: %v", err))
}
return true, ci, nil
}
return false, 0, nil
}