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 {
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
}
// Switch on the method
switch req.Method {
case "GET":
if keyList {
return s.KVSGetKeys(resp, req, &args)
} else {
return s.KVSGet(resp, req, &args)
}
case "PUT":
return s.KVSPut(resp, req, &args)
case "DELETE":
return s.KVSDelete(resp, req, &args)
default:
resp.WriteHeader(405)
return nil, nil
}
}
// remoteExecGetSpec is used to get the exec specification.
// Returns if execution should continue
func (a *Agent) remoteExecGetSpec(event *remoteExecEvent, spec *remoteExecSpec) bool {
get := structs.KeyRequest{
Datacenter: a.config.Datacenter,
Key: path.Join(event.Prefix, event.Session, remoteExecFileName),
QueryOptions: structs.QueryOptions{
AllowStale: true, // Stale read for scale! Retry on failure.
},
}
get.Token = a.config.ACLToken
var out structs.IndexedDirEntries
QUERY:
if err := a.RPC("KVS.Get", &get, &out); err != nil {
a.logger.Printf("[ERR] agent: failed to get remote exec job: %v", err)
return false
}
if len(out.Entries) == 0 {
// If the initial read was stale and had no data, retry as a consistent read
if get.QueryOptions.AllowStale {
a.logger.Printf("[DEBUG] agent: trying consistent fetch of remote exec job spec")
get.QueryOptions.AllowStale = false
goto QUERY
} else {
a.logger.Printf("[DEBUG] agent: remote exec aborted, job spec missing")
return false
}
}
if err := json.Unmarshal(out.Entries[0].Value, &spec); err != nil {
a.logger.Printf("[ERR] agent: failed to decode remote exec spec: %v", err)
return false
}
return true
}
func getKV(t *testing.T, agent *Agent, key string) *structs.DirEntry {
req := structs.KeyRequest{
Datacenter: agent.config.Datacenter,
Key: key,
}
req.Token = agent.config.ACLToken
var out structs.IndexedDirEntries
if err := agent.RPC("KVS.Get", &req, &out); err != nil {
t.Fatalf("err: %v", err)
}
if len(out.Entries) > 0 {
return out.Entries[0]
}
return nil
}
func TestKVSEndpoint_List_Blocking(t *testing.T) {
dir1, s1 := testServer(t)
defer os.RemoveAll(dir1)
defer s1.Shutdown()
client := rpcClient(t, s1)
defer client.Close()
testutil.WaitForLeader(t, client.Call, "dc1")
keys := []string{
"/test/key1",
"/test/key2",
"/test/sub/key3",
}
for _, key := range keys {
arg := structs.KVSRequest{
Datacenter: "dc1",
Op: structs.KVSSet,
DirEnt: structs.DirEntry{
Key: key,
Flags: 1,
},
}
var out bool
if err := client.Call("KVS.Apply", &arg, &out); err != nil {
t.Fatalf("err: %v", err)
}
}
getR := structs.KeyRequest{
Datacenter: "dc1",
Key: "/test",
}
var dirent structs.IndexedDirEntries
if err := client.Call("KVS.List", &getR, &dirent); err != nil {
t.Fatalf("err: %v", err)
}
// Setup a blocking query
getR.MinQueryIndex = dirent.Index
getR.MaxQueryTime = time.Second
// Async cause a change
start := time.Now()
go func() {
time.Sleep(100 * time.Millisecond)
client := rpcClient(t, s1)
defer client.Close()
arg := structs.KVSRequest{
Datacenter: "dc1",
Op: structs.KVSDelete,
DirEnt: structs.DirEntry{
Key: "/test/sub/key3",
},
}
var out bool
if err := client.Call("KVS.Apply", &arg, &out); err != nil {
t.Fatalf("err: %v", err)
}
}()
// Re-run the query
dirent = structs.IndexedDirEntries{}
if err := client.Call("KVS.List", &getR, &dirent); err != nil {
t.Fatalf("err: %v", err)
}
// Should block at least 100ms
if time.Now().Sub(start) < 100*time.Millisecond {
t.Fatalf("too fast")
}
if dirent.Index == 0 {
t.Fatalf("Bad: %v", dirent)
}
if len(dirent.Entries) != 2 {
for _, ent := range dirent.Entries {
t.Errorf("Bad: %#v", *ent)
}
}
for i := 0; i < len(dirent.Entries); i++ {
d := dirent.Entries[i]
if d.Key != keys[i] {
t.Fatalf("bad: %v", d)
}
if d.Flags != 1 {
t.Fatalf("bad: %v", d)
}
if d.Value != nil {
t.Fatalf("bad: %v", d)
}
}
}