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Added bootstrapCluster arg for server. This argument is what will determine if the server bootstraps a raft cluster.

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CreateKeyAndLock function will now wither create a lock or obtain an existing lock.
This commit is contained in:
Kelvin Clement Mwinuka
2023-11-21 19:12:07 +08:00
parent e1dcc809bf
commit 0e37052547
8 changed files with 96 additions and 62 deletions
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1
Dockerfile
View File

@@ -24,3 +24,4 @@ CMD "./server" \
"--http=${HTTP}" \
"--tls=${TLS}" \
"--inMemory=${INMEMORY}" \
"--bootstrapCluster=${BOOTSTRAP_CLUSTER}" \

19
src/main.go
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@@ -39,6 +39,7 @@ type Server struct {
store map[string]interface{}
keyLocks map[string]*sync.RWMutex
keyCreationLock *sync.Mutex
plugins []Plugin
@@ -97,16 +98,25 @@ func (server *Server) KeyExists(key string) bool {
return server.keyLocks[key] != nil
}
func (server *Server) CreateKey(key string, value interface{}) {
server.keyLocks[key] = &sync.RWMutex{}
server.store[key] = value
func (server *Server) CreateKeyAndLock(ctx context.Context, key string) (bool, error) {
server.keyCreationLock.Lock()
defer server.keyCreationLock.Unlock()
if !server.KeyExists(key) {
keyLock := &sync.RWMutex{}
keyLock.Lock()
server.keyLocks[key] = keyLock
return true, nil
}
return server.KeyLock(ctx, key)
}
func (server *Server) GetValue(key string) interface{} {
return server.store[key]
}
func (server *Server) SetValue(key string, value interface{}) {
func (server *Server) SetValue(ctx context.Context, key string, value interface{}) {
server.store[key] = value
}
@@ -358,6 +368,7 @@ func (server *Server) Start(ctx context.Context) {
server.store = make(map[string]interface{})
server.keyLocks = make(map[string]*sync.RWMutex)
server.keyCreationLock = &sync.Mutex{}
server.LoadPlugins(ctx)

15
src/plugins/commands/get/command.go
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@@ -13,9 +13,9 @@ type Server interface {
KeyRLock(ctx context.Context, key string) (bool, error)
KeyRUnlock(key string)
KeyExists(key string) bool
CreateKey(key string, value interface{})
CreateKeyAndLock(ctx context.Context, key string) (bool, error)
GetValue(key string) interface{}
SetValue(key string, value interface{})
SetValue(ctx context.Context, key string, value interface{})
}
type plugin struct {
@@ -54,9 +54,11 @@ func handleGet(ctx context.Context, cmd []string, s Server) ([]byte, error) {
return nil, errors.New("wrong number of args for GET command")
}
s.KeyRLock(ctx, cmd[1])
value := s.GetValue(cmd[1])
s.KeyRUnlock(cmd[1])
key := cmd[1]
s.KeyRLock(ctx, key)
value := s.GetValue(key)
s.KeyRUnlock(key)
switch value.(type) {
default:
@@ -74,6 +76,7 @@ func handleMGet(ctx context.Context, cmd []string, s Server) ([]byte, error) {
vals := []string{}
for _, key := range cmd[1:] {
func(key string) {
s.KeyRLock(ctx, key)
switch s.GetValue(key).(type) {
default:
@@ -82,6 +85,8 @@ func handleMGet(ctx context.Context, cmd []string, s Server) ([]byte, error) {
vals = append(vals, "nil")
}
s.KeyRUnlock(key)
}(key)
}
var bytes []byte = []byte(fmt.Sprintf("*%d\r\n", len(vals)))

50
src/plugins/commands/list/command.go
View File

@@ -21,9 +21,9 @@ type Server interface {
KeyRLock(ctx context.Context, key string) (bool, error)
KeyRUnlock(key string)
KeyExists(key string) bool
CreateKey(key string, value interface{})
CreateKeyAndLock(ctx context.Context, key string) (bool, error)
GetValue(key string) interface{}
SetValue(key string, value interface{})
SetValue(ctx context.Context, key string, value interface{})
}
type plugin struct {
@@ -246,7 +246,7 @@ func handleLSet(ctx context.Context, cmd []string, server Server) ([]byte, error
}
list[index] = utils.AdaptType(cmd[3])
server.SetValue(cmd[1], list)
server.SetValue(ctx, cmd[1], list)
server.KeyUnlock(cmd[1])
return []byte(OK), nil
@@ -284,12 +284,12 @@ func handleLTrim(ctx context.Context, cmd []string, server Server) ([]byte, erro
}
if end == -1 || int(end) > len(list) {
server.SetValue(cmd[1], list[start:])
server.SetValue(ctx, cmd[1], list[start:])
server.KeyUnlock(cmd[1])
return []byte(OK), nil
}
server.SetValue(cmd[1], list[start:end])
server.SetValue(ctx, cmd[1], list[start:end])
server.KeyUnlock(cmd[1])
return []byte(OK), nil
}
@@ -350,7 +350,7 @@ func handleLRem(ctx context.Context, cmd []string, server Server) ([]byte, error
return elem != nil
})
server.SetValue(cmd[1], list)
server.SetValue(ctx, cmd[1], list)
server.KeyUnlock(cmd[1])
return []byte(OK), nil
@@ -384,18 +384,18 @@ func handleLMove(ctx context.Context, cmd []string, server Server) ([]byte, erro
switch whereFrom {
case "left":
server.SetValue(cmd[1], append([]interface{}{}, source[1:]...))
server.SetValue(ctx, cmd[1], append([]interface{}{}, source[1:]...))
if whereTo == "left" {
server.SetValue(cmd[2], append(source[0:1], destination...))
server.SetValue(ctx, cmd[2], append(source[0:1], destination...))
} else if whereTo == "right" {
server.SetValue(cmd[2], append(destination, source[0]))
server.SetValue(ctx, cmd[2], append(destination, source[0]))
}
case "right":
server.SetValue(cmd[1], append([]interface{}{}, source[:len(source)-1]...))
server.SetValue(ctx, cmd[1], append([]interface{}{}, source[:len(source)-1]...))
if whereTo == "left" {
server.SetValue(cmd[2], append(source[len(source)-1:], destination...))
server.SetValue(ctx, cmd[2], append(source[len(source)-1:], destination...))
} else if whereTo == "right" {
server.SetValue(cmd[2], append(destination, source[len(source)-1]))
server.SetValue(ctx, cmd[2], append(destination, source[len(source)-1]))
}
}
@@ -416,19 +416,22 @@ func handleLPush(ctx context.Context, cmd []string, server Server) ([]byte, erro
newElems = append(newElems, utils.AdaptType(elem))
}
if !server.KeyExists(cmd[1]) {
key := cmd[1]
if !server.KeyExists(key) {
switch strings.ToLower(cmd[0]) {
case "lpushx":
return nil, fmt.Errorf("%s command on non-list item", cmd[0])
default:
server.CreateKey(cmd[1], []interface{}{})
// TODO: Retry CreateKeyAndLock until we obtain the key lock
server.CreateKeyAndLock(ctx, key)
server.SetValue(ctx, key, []interface{}{})
}
}
server.KeyLock(ctx, cmd[1])
defer server.KeyUnlock(cmd[1])
defer server.KeyUnlock(key)
currentList := server.GetValue(cmd[1])
currentList := server.GetValue(key)
l, ok := currentList.([]interface{})
@@ -436,7 +439,7 @@ func handleLPush(ctx context.Context, cmd []string, server Server) ([]byte, erro
return nil, fmt.Errorf("%s command on non-list item", cmd[0])
}
server.SetValue(cmd[1], append(newElems, l...))
server.SetValue(ctx, key, append(newElems, l...))
return []byte(OK), nil
}
@@ -456,11 +459,12 @@ func handleRPush(ctx context.Context, cmd []string, server Server) ([]byte, erro
case "rpushx":
return nil, fmt.Errorf("%s command on non-list item", cmd[0])
default:
server.CreateKey(cmd[1], []interface{}{})
// TODO: Retry CreateKeyAndLock until we managed to obtain the key
server.CreateKeyAndLock(ctx, cmd[1])
server.SetValue(ctx, cmd[1], []interface{}{})
}
}
server.KeyLock(ctx, cmd[1])
defer server.KeyUnlock(cmd[1])
currentList := server.GetValue(cmd[1])
@@ -471,7 +475,7 @@ func handleRPush(ctx context.Context, cmd []string, server Server) ([]byte, erro
return nil, errors.New("RPUSH command on non-list item")
}
server.SetValue(cmd[1], append(l, newElems...))
server.SetValue(ctx, cmd[1], append(l, newElems...))
return []byte(OK), nil
}
@@ -499,10 +503,10 @@ func handlePop(ctx context.Context, cmd []string, server Server) ([]byte, error)
switch strings.ToLower(cmd[0]) {
default:
server.SetValue(cmd[1], list[1:])
server.SetValue(ctx, cmd[1], list[1:])
return []byte(fmt.Sprintf("+%v\r\n\n", list[0])), nil
case "rpop":
server.SetValue(cmd[1], list[:len(list)-1])
server.SetValue(ctx, cmd[1], list[:len(list)-1])
return []byte(fmt.Sprintf("+%v\r\n\n", list[len(list)-1])), nil
}

9
src/plugins/commands/ping/command.go
View File

@@ -10,13 +10,14 @@ const (
)
type Server interface {
KeyLock(key string)
KeyLock(ctx context.Context, key string) (bool, error)
KeyUnlock(key string)
KeyRLock(key string)
KeyRLock(ctx context.Context, key string) (bool, error)
KeyRUnlock(key string)
CreateKey(key string, value interface{})
KeyExists(key string) bool
CreateKeyAndLock(ctx context.Context, key string) (bool, error)
GetValue(key string) interface{}
SetValue(key string, value interface{})
SetValue(ctx context.Context, key string, value interface{})
}
type plugin struct {

27
src/plugins/commands/set/command.go
View File

@@ -15,9 +15,9 @@ type Server interface {
KeyRLock(ctx context.Context, key string) (bool, error)
KeyRUnlock(key string)
KeyExists(key string) bool
CreateKey(key string, value interface{})
CreateKeyAndLock(ctx context.Context, key string) (bool, error)
GetValue(key string) interface{}
SetValue(key string, value interface{})
SetValue(ctx context.Context, key string, value interface{})
}
type plugin struct {
@@ -61,17 +61,22 @@ func handleSet(ctx context.Context, cmd []string, s Server) ([]byte, error) {
default:
return nil, errors.New("wrong number of args for SET command")
case x == 3:
if !s.KeyExists(cmd[1]) {
s.CreateKey(cmd[1], utils.AdaptType(cmd[2]))
key := cmd[1]
if !s.KeyExists(key) {
// TODO: Retry CreateKeyAndLock until we manage to obtain the key
s.CreateKeyAndLock(ctx, key)
s.SetValue(ctx, key, utils.AdaptType(cmd[2]))
s.KeyUnlock(key)
return []byte("+OK\r\n\n"), nil
}
if _, err := s.KeyLock(ctx, cmd[1]); err != nil {
if _, err := s.KeyLock(ctx, key); err != nil {
return nil, err
}
s.SetValue(cmd[1], utils.AdaptType(cmd[2]))
s.KeyUnlock(cmd[1])
s.SetValue(ctx, key, utils.AdaptType(cmd[2]))
s.KeyUnlock(key)
return []byte("+OK\r\n\n"), nil
}
}
@@ -81,10 +86,14 @@ func handleSetNX(ctx context.Context, cmd []string, s Server) ([]byte, error) {
default:
return nil, errors.New("wrong number of args for SETNX command")
case x == 3:
if s.KeyExists(cmd[1]) {
key := cmd[1]
if s.KeyExists(key) {
return nil, fmt.Errorf("key %s already exists", cmd[1])
}
s.CreateKey(cmd[1], utils.AdaptType(cmd[2]))
// TODO: Retry CreateKeyAndLock until we manage to obtain the key
s.CreateKeyAndLock(ctx, key)
s.SetValue(ctx, key, utils.AdaptType(cmd[2]))
s.KeyUnlock(key)
}
return []byte("+OK\r\n\n"), nil
}

9
src/raft.go
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@@ -88,8 +88,7 @@ func (server *Server) RaftInit(ctx context.Context) {
server.raft = raftServer
// TODO: Only bootstrap cluster if --bootstrapCluster=true config is set
if conf.JoinAddr == "" {
if conf.BootstrapCluster {
// Bootstrap raft cluster
if err := server.raft.BootstrapCluster(raft.Configuration{
Servers: []raft.Server{
@@ -106,7 +105,7 @@ func (server *Server) RaftInit(ctx context.Context) {
}
// Implement raft.FSM interface
// Apply Implements raft.FSM interface
func (server *Server) Apply(log *raft.Log) interface{} {
switch log.Type {
case raft.LogCommand:
@@ -191,7 +190,7 @@ func (server *Server) Restore(snapshot io.ReadCloser) error {
for k, v := range data {
server.keyLocks[k].Lock()
server.SetValue(k, v)
server.SetValue(context.Background(), k, v)
server.keyLocks[k].Unlock()
}
@@ -256,7 +255,7 @@ func (server *Server) addVoter(
}
for _, s := range raftConfig.Configuration().Servers {
// Check if a server already exists with the current attribtues
// Check if a server already exists with the current attributes
if s.ID == id && s.Address == address {
return fmt.Errorf("server with id %s and address %s already exists", id, address)
}

6
src/utils/config.go
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@@ -23,6 +23,7 @@ type Config struct {
MemberListBindPort uint16 `json:"mlPort" yaml:"mlPort"`
InMemory bool `json:"inMemory" yaml:"inMemory"`
DataDir string `json:"dataDir" yaml:"dataDir"`
BootstrapCluster bool `json:"BootstrapCluster" yaml:"bootstrapCluster"`
}
func GetConfig() Config {
@@ -37,8 +38,10 @@ func GetConfig() Config {
bindAddr := flag.String("bindAddr", "", "Address to bind the server to.")
raftBindPort := flag.Int("raftPort", 7481, "Port to use for intra-cluster communication. Leave on the client.")
mlBindPort := flag.Int("mlPort", 7946, "Port to use for memberlist communication.")
inMemory := flag.Bool("inMemory", false, "Wether to use memory or persisten storage for raft logs and snapshots.")
inMemory := flag.Bool("inMemory", false, "Whether to use memory or persisten storage for raft logs and snapshots.")
dataDir := flag.String("dataDir", "/var/lib/memstore", "Directory to store raft snapshots and logs.")
bootstrapCluster := flag.Bool("bootstrapCluster", false, "Whether this instance should bootstrap a new cluster.")
config := flag.String(
"config",
"",
@@ -61,6 +64,7 @@ func GetConfig() Config {
MemberListBindPort: uint16(*mlBindPort),
InMemory: *inMemory,
DataDir: *dataDir,
BootstrapCluster: *bootstrapCluster,
}
if len(*config) > 0 {