open-consul/command/agent/kvs_endpoint.go

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package agent
import (
"bytes"
"fmt"
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"github.com/hashicorp/consul/consul/structs"
"io"
"net/http"
"strconv"
"strings"
)
const (
// maxKVSize is used to limit the maximum payload length
// of a KV entry. If it exceeds this amount, the client is
// likely abusing the KV store.
maxKVSize = 512 * 1024
)
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func (s *HTTPServer) KVSEndpoint(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Set default DC
args := structs.KeyRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
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return nil, nil
}
// Pull out the key name, validation left to each sub-handler
args.Key = strings.TrimPrefix(req.URL.Path, "/v1/kv/")
// Check for a key list
keyList := false
params := req.URL.Query()
if _, ok := params["keys"]; ok {
keyList = true
}
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// Switch on the method
switch req.Method {
case "GET":
if keyList {
return s.KVSGetKeys(resp, req, &args)
} else {
return s.KVSGet(resp, req, &args)
}
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case "PUT":
return s.KVSPut(resp, req, &args)
case "DELETE":
return s.KVSDelete(resp, req, &args)
default:
resp.WriteHeader(405)
return nil, nil
}
return nil, nil
}
// KVSGet handles a GET request
func (s *HTTPServer) KVSGet(resp http.ResponseWriter, req *http.Request, args *structs.KeyRequest) (interface{}, error) {
// Check for recurse
method := "KVS.Get"
params := req.URL.Query()
if _, ok := params["recurse"]; ok {
method = "KVS.List"
} else if missingKey(resp, args) {
return nil, nil
}
// Make the RPC
var out structs.IndexedDirEntries
if err := s.agent.RPC(method, &args, &out); err != nil {
return nil, err
}
setMeta(resp, &out.QueryMeta)
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// Check if we get a not found
if len(out.Entries) == 0 {
resp.WriteHeader(404)
return nil, nil
}
// Check if we are in raw mode with a normal get, write out
// the raw body
if _, ok := params["raw"]; ok && method == "KVS.Get" {
body := out.Entries[0].Value
resp.Header().Set("Content-Length", strconv.FormatInt(int64(len(body)), 10))
resp.Write(body)
return nil, nil
}
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return out.Entries, nil
}
// KVSGetKeys handles a GET request for keys
func (s *HTTPServer) KVSGetKeys(resp http.ResponseWriter, req *http.Request, args *structs.KeyRequest) (interface{}, error) {
// Check for a seperator, due to historic spelling error,
// we now are forced to check for both spellings
var sep string
params := req.URL.Query()
if _, ok := params["seperator"]; ok {
sep = params.Get("seperator")
}
if _, ok := params["separator"]; ok {
sep = params.Get("separator")
}
// Construct the args
listArgs := structs.KeyListRequest{
Datacenter: args.Datacenter,
Prefix: args.Key,
Seperator: sep,
QueryOptions: args.QueryOptions,
}
// Make the RPC
var out structs.IndexedKeyList
if err := s.agent.RPC("KVS.ListKeys", &listArgs, &out); err != nil {
return nil, err
}
setMeta(resp, &out.QueryMeta)
// Check if we get a not found. We do not generate
// not found for the root, but just provide the empty list
if len(out.Keys) == 0 && listArgs.Prefix != "" {
resp.WriteHeader(404)
return nil, nil
}
// Use empty list instead of null
if out.Keys == nil {
out.Keys = []string{}
}
return out.Keys, nil
}
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// KVSPut handles a PUT request
func (s *HTTPServer) KVSPut(resp http.ResponseWriter, req *http.Request, args *structs.KeyRequest) (interface{}, error) {
if missingKey(resp, args) {
return nil, nil
}
applyReq := structs.KVSRequest{
Datacenter: args.Datacenter,
Op: structs.KVSSet,
DirEnt: structs.DirEntry{
Key: args.Key,
Flags: 0,
Value: nil,
},
}
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applyReq.Token = args.Token
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// Check for flags
params := req.URL.Query()
if _, ok := params["flags"]; ok {
flagVal, err := strconv.ParseUint(params.Get("flags"), 10, 64)
if err != nil {
return nil, err
}
applyReq.DirEnt.Flags = flagVal
}
// Check for cas value
if _, ok := params["cas"]; ok {
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casVal, err := strconv.ParseUint(params.Get("cas"), 10, 64)
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if err != nil {
return nil, err
}
applyReq.DirEnt.ModifyIndex = casVal
applyReq.Op = structs.KVSCAS
}
// Check for lock acquisition
if _, ok := params["acquire"]; ok {
applyReq.DirEnt.Session = params.Get("acquire")
applyReq.Op = structs.KVSLock
}
// Check for lock release
if _, ok := params["release"]; ok {
applyReq.DirEnt.Session = params.Get("release")
applyReq.Op = structs.KVSUnlock
}
// Check the content-length
if req.ContentLength > maxKVSize {
resp.WriteHeader(413)
resp.Write([]byte(fmt.Sprintf("Value exceeds %d byte limit", maxKVSize)))
return nil, nil
}
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// Copy the value
buf := bytes.NewBuffer(nil)
if _, err := io.Copy(buf, req.Body); err != nil {
return nil, err
}
applyReq.DirEnt.Value = buf.Bytes()
// Make the RPC
var out bool
if err := s.agent.RPC("KVS.Apply", &applyReq, &out); err != nil {
return nil, err
}
// Only use the out value if this was a CAS
if applyReq.Op == structs.KVSSet {
return true, nil
} else {
return out, nil
}
}
// KVSPut handles a DELETE request
func (s *HTTPServer) KVSDelete(resp http.ResponseWriter, req *http.Request, args *structs.KeyRequest) (interface{}, error) {
applyReq := structs.KVSRequest{
Datacenter: args.Datacenter,
Op: structs.KVSDelete,
DirEnt: structs.DirEntry{
Key: args.Key,
},
}
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applyReq.Token = args.Token
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// Check for recurse
params := req.URL.Query()
if _, ok := params["recurse"]; ok {
applyReq.Op = structs.KVSDeleteTree
} else if missingKey(resp, args) {
return nil, nil
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}
// Make the RPC
var out bool
if err := s.agent.RPC("KVS.Apply", &applyReq, &out); err != nil {
return nil, err
}
return nil, nil
}
// missingKey checks if the key is missing
func missingKey(resp http.ResponseWriter, args *structs.KeyRequest) bool {
if args.Key == "" {
resp.WriteHeader(400)
resp.Write([]byte("Missing key name"))
return true
}
return false
}