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Copy pathserver.go
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683 lines (578 loc) · 17.5 KB
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package litestream
import (
"context"
"encoding/json"
"errors"
"fmt"
"log/slog"
"net"
"net/http"
"net/http/pprof"
"os"
"sync"
"time"
)
// SocketConfig configures the Unix socket for control commands.
type SocketConfig struct {
Enabled bool `yaml:"enabled"`
Path string `yaml:"path"`
Permissions uint32 `yaml:"permissions"`
}
// DefaultSocketConfig returns the default socket configuration.
func DefaultSocketConfig() SocketConfig {
return SocketConfig{
Enabled: false,
Path: "/var/run/litestream.sock",
Permissions: 0600,
}
}
// Server manages runtime control via Unix socket using HTTP.
type Server struct {
store *Store
// SocketPath is the path to the Unix socket.
SocketPath string
// SocketPerms is the file permissions for the socket.
SocketPerms uint32
// PathExpander optionally expands paths (e.g., ~ expansion).
// If nil, paths are used as-is.
PathExpander func(string) (string, error)
// Version is the version string to report in /info.
Version string
// startedAt is set when the server starts.
startedAt time.Time
socketListener net.Listener
httpServer *http.Server
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
logger *slog.Logger
}
// NewServer creates a new Server instance.
func NewServer(store *Store) *Server {
ctx, cancel := context.WithCancel(context.Background())
s := &Server{
store: store,
SocketPerms: 0600,
ctx: ctx,
cancel: cancel,
logger: slog.Default().With(LogKeySystem, LogSystemServer),
}
mux := http.NewServeMux()
mux.HandleFunc("POST /start", s.handleStart)
mux.HandleFunc("POST /stop", s.handleStop)
mux.HandleFunc("GET /txid", s.handleTXID)
mux.HandleFunc("POST /register", s.handleRegister)
mux.HandleFunc("POST /unregister", s.handleUnregister)
mux.HandleFunc("POST /sync", s.handleSync)
mux.HandleFunc("GET /list", s.handleList)
mux.HandleFunc("GET /info", s.handleInfo)
mux.HandleFunc("GET /debug/sync-status", s.handleSyncStatus)
// pprof endpoints
mux.HandleFunc("GET /debug/pprof/", pprof.Index)
mux.HandleFunc("GET /debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("GET /debug/pprof/profile", pprof.Profile)
mux.HandleFunc("GET /debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("GET /debug/pprof/trace", pprof.Trace)
s.httpServer = &http.Server{Handler: mux}
return s
}
// Start begins listening for control connections.
func (s *Server) Start() error {
if s.SocketPath == "" {
return fmt.Errorf("socket path required")
}
// Check if socket file exists and is actually a socket before removing
if info, err := os.Lstat(s.SocketPath); err == nil {
if info.Mode()&os.ModeSocket != 0 {
if err := os.Remove(s.SocketPath); err != nil {
return fmt.Errorf("remove existing socket: %w", err)
}
} else {
return fmt.Errorf("socket path exists but is not a socket: %s", s.SocketPath)
}
} else if !os.IsNotExist(err) {
return fmt.Errorf("check socket path: %w", err)
}
listener, err := net.Listen("unix", s.SocketPath)
if err != nil {
return fmt.Errorf("listen on unix socket: %w", err)
}
s.socketListener = listener
if err := os.Chmod(s.SocketPath, os.FileMode(s.SocketPerms)); err != nil {
listener.Close()
return fmt.Errorf("chmod socket: %w", err)
}
// Set startedAt after successful socket setup to ensure uptime reflects
// the actual time the server became available.
s.startedAt = time.Now()
s.logger.Info("control socket listening", "path", s.SocketPath)
s.wg.Add(1)
go func() {
defer s.wg.Done()
if err := s.httpServer.Serve(listener); err != nil && err != http.ErrServerClosed {
s.logger.Error("http server error", "error", err)
}
}()
return nil
}
// Close gracefully shuts down the control server.
func (s *Server) Close() error {
s.cancel()
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if s.httpServer != nil {
if err := s.httpServer.Shutdown(ctx); err != nil {
s.logger.Error("http server shutdown error", "error", err)
}
}
s.wg.Wait()
return nil
}
// expandPath expands the path using PathExpander if set.
func (s *Server) expandPath(path string) (string, error) {
if s.PathExpander != nil {
return s.PathExpander(path)
}
return path, nil
}
func (s *Server) handleStart(w http.ResponseWriter, r *http.Request) {
var req StartRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeJSONError(w, http.StatusBadRequest, "invalid request body", err.Error())
return
}
if req.Path == "" {
writeJSONError(w, http.StatusBadRequest, "path required", nil)
return
}
expandedPath, err := s.expandPath(req.Path)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid path: %v", err), nil)
return
}
ctx := s.ctx
if req.Timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(s.ctx, time.Duration(req.Timeout)*time.Second)
defer cancel()
}
db := s.store.FindDB(expandedPath)
if db == nil {
writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("database not found: %s", expandedPath), nil)
return
}
status := "started"
if db.IsOpen() {
status = "already_running"
} else {
if err := s.store.EnableDB(ctx, expandedPath); err != nil {
writeJSONError(w, http.StatusInternalServerError, err.Error(), nil)
return
}
}
txID, err := s.storeTXID(expandedPath)
if err != nil {
writeJSONError(w, http.StatusInternalServerError, err.Error(), nil)
return
}
writeJSON(w, http.StatusOK, StartResponse{
Status: status,
Path: expandedPath,
TXID: txID,
})
}
func (s *Server) handleStop(w http.ResponseWriter, r *http.Request) {
var req StopRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeJSONError(w, http.StatusBadRequest, "invalid request body", err.Error())
return
}
if req.Path == "" {
writeJSONError(w, http.StatusBadRequest, "path required", nil)
return
}
expandedPath, err := s.expandPath(req.Path)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid path: %v", err), nil)
return
}
timeout := req.Timeout
if timeout == 0 {
timeout = 30
}
ctx, cancel := context.WithTimeout(s.ctx, time.Duration(timeout)*time.Second)
defer cancel()
db := s.store.FindDB(expandedPath)
if db == nil {
writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("database not found: %s", expandedPath), nil)
return
}
status := "stopped"
if !db.IsOpen() {
status = "already_stopped"
} else {
if err := s.store.DisableDB(ctx, expandedPath); err != nil {
writeJSONError(w, http.StatusInternalServerError, err.Error(), nil)
return
}
}
txID, err := s.storeTXID(expandedPath)
if err != nil {
writeJSONError(w, http.StatusInternalServerError, err.Error(), nil)
return
}
writeJSON(w, http.StatusOK, StopResponse{
Status: status,
Path: expandedPath,
TXID: txID,
})
}
func (s *Server) storeTXID(path string) (uint64, error) {
db := s.store.FindDB(path)
if db == nil {
return 0, fmt.Errorf("database not found: %s", path)
}
_, maxTXID, err := db.MaxLTX()
if err != nil {
return 0, fmt.Errorf("read txid: %w", err)
}
return uint64(maxTXID), nil
}
func (s *Server) handleTXID(w http.ResponseWriter, r *http.Request) {
path := r.URL.Query().Get("path")
if path == "" {
writeJSONError(w, http.StatusBadRequest, "path required", nil)
return
}
expandedPath, err := s.expandPath(path)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid path: %v", err), nil)
return
}
db := s.store.FindDB(expandedPath)
if db == nil {
writeJSONError(w, http.StatusNotFound, "database not found", nil)
return
}
pos, err := db.Pos()
if err != nil {
writeJSONError(w, http.StatusInternalServerError, err.Error(), nil)
return
}
writeJSON(w, http.StatusOK, TXIDResponse{
TXID: uint64(pos.TXID),
})
}
func (s *Server) handleSyncStatus(w http.ResponseWriter, r *http.Request) {
path := r.URL.Query().Get("path")
if path != "" {
expandedPath, err := s.expandPath(path)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid path: %v", err), nil)
return
}
db := s.store.FindDB(expandedPath)
if db == nil {
writeJSONError(w, http.StatusNotFound, "database not found", nil)
return
}
writeJSON(w, http.StatusOK, SyncDiagnosticsResponse{
Databases: []SyncDiagnostic{db.SyncDiagnostic()},
})
return
}
dbs := s.store.DBs()
diagnostics := make([]SyncDiagnostic, 0, len(dbs))
for _, db := range dbs {
diagnostics = append(diagnostics, db.SyncDiagnostic())
}
writeJSON(w, http.StatusOK, SyncDiagnosticsResponse{Databases: diagnostics})
}
func writeJSON(w http.ResponseWriter, status int, v interface{}) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
json.NewEncoder(w).Encode(v)
}
func writeJSONError(w http.ResponseWriter, status int, message string, details interface{}) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
json.NewEncoder(w).Encode(ErrorResponse{
Error: message,
Details: details,
})
}
// StartRequest is the request body for the /start endpoint.
type StartRequest struct {
Path string `json:"path"`
Timeout int `json:"timeout,omitempty"`
}
// StartResponse is the response body for the /start endpoint.
type StartResponse struct {
Status string `json:"status"`
Path string `json:"path"`
TXID uint64 `json:"txid"`
}
// StopRequest is the request body for the /stop endpoint.
type StopRequest struct {
Path string `json:"path"`
Timeout int `json:"timeout,omitempty"`
}
// StopResponse is the response body for the /stop endpoint.
type StopResponse struct {
Status string `json:"status"`
Path string `json:"path"`
TXID uint64 `json:"txid"`
}
// ErrorResponse is returned when an error occurs.
type ErrorResponse struct {
Error string `json:"error"`
Details interface{} `json:"details,omitempty"`
}
// TXIDResponse is the response body for the /txid endpoint.
type TXIDResponse struct {
TXID uint64 `json:"txid"`
}
// SyncDiagnosticsResponse is the response body for /debug/sync-status.
type SyncDiagnosticsResponse struct {
Databases []SyncDiagnostic `json:"databases"`
}
func (s *Server) handleSync(w http.ResponseWriter, r *http.Request) {
var req SyncRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeJSONError(w, http.StatusBadRequest, "invalid request body", err.Error())
return
}
if req.Path == "" {
writeJSONError(w, http.StatusBadRequest, "path required", nil)
return
}
expandedPath, err := s.expandPath(req.Path)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid path: %v", err), nil)
return
}
ctx, cancel := context.WithCancel(r.Context())
defer cancel()
stop := context.AfterFunc(s.ctx, cancel)
defer stop()
if req.Wait && req.Timeout == 0 {
req.Timeout = 30
}
if req.Timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, time.Duration(req.Timeout)*time.Second)
defer cancel()
}
result, err := s.store.SyncDB(ctx, expandedPath, req.Wait)
if err != nil {
switch {
case errors.Is(err, ErrDatabaseNotFound):
writeJSONError(w, http.StatusNotFound, err.Error(), nil)
case errors.Is(err, ErrDatabaseNotOpen):
writeJSONError(w, http.StatusConflict, err.Error(), nil)
default:
writeJSONError(w, http.StatusInternalServerError, err.Error(), nil)
}
return
}
var status string
if !result.Changed {
status = "no_change"
} else if req.Wait {
status = "synced"
} else {
status = "synced_local"
}
writeJSON(w, http.StatusOK, SyncResponse{
Status: status,
Path: expandedPath,
TXID: result.TXID,
ReplicatedTXID: result.ReplicatedTXID,
})
}
// SyncRequest is the request body for the /sync endpoint.
type SyncRequest struct {
Path string `json:"path"`
Wait bool `json:"wait,omitempty"`
Timeout int `json:"timeout,omitempty"`
}
// SyncResponse is the response body for the /sync endpoint.
type SyncResponse struct {
Status string `json:"status"`
Path string `json:"path"`
TXID uint64 `json:"txid"`
ReplicatedTXID uint64 `json:"replicated_txid"`
}
func (s *Server) handleList(w http.ResponseWriter, _ *http.Request) {
dbs := s.store.DBs()
resp := ListResponse{
Databases: make([]DatabaseSummary, 0, len(dbs)),
}
for _, db := range dbs {
var status string
if db.IsOpen() {
if db.Replica != nil && db.Replica.MonitorEnabled {
status = "replicating"
} else {
status = "open"
}
} else {
status = "stopped"
}
summary := DatabaseSummary{
Path: db.Path(),
Status: status,
}
if t := db.LastSuccessfulSyncAt(); !t.IsZero() {
summary.LastSyncAt = &t
}
resp.Databases = append(resp.Databases, summary)
}
writeJSON(w, http.StatusOK, resp)
}
func (s *Server) handleInfo(w http.ResponseWriter, _ *http.Request) {
resp := InfoResponse{
Version: s.Version,
PID: os.Getpid(),
StartedAt: s.startedAt,
UptimeSeconds: int64(time.Since(s.startedAt).Seconds()),
DatabaseCount: len(s.store.DBs()),
}
writeJSON(w, http.StatusOK, resp)
}
// ListResponse is the response body for the /list endpoint.
type ListResponse struct {
Databases []DatabaseSummary `json:"databases"`
}
// DatabaseSummary contains summary information about a database.
type DatabaseSummary struct {
Path string `json:"path"`
Status string `json:"status"`
// LastSyncAt is the timestamp of the last successful replica sync.
// This reflects when data was last successfully uploaded to the replica
// storage backend, not just when the local WAL was processed.
LastSyncAt *time.Time `json:"last_sync_at,omitempty"`
}
// InfoResponse is the response body for the /info endpoint.
type InfoResponse struct {
Version string `json:"version"`
PID int `json:"pid"`
UptimeSeconds int64 `json:"uptime_seconds"`
StartedAt time.Time `json:"started_at"`
DatabaseCount int `json:"database_count"`
}
// RegisterDatabaseRequest is the request body for the /register endpoint.
type RegisterDatabaseRequest struct {
Path string `json:"path"`
ReplicaURL string `json:"replica_url"`
}
// RegisterDatabaseResponse is the response body for the /register endpoint.
type RegisterDatabaseResponse struct {
Status string `json:"status"`
Path string `json:"path"`
}
// UnregisterDatabaseRequest is the request body for the /unregister endpoint.
type UnregisterDatabaseRequest struct {
Path string `json:"path"`
Timeout int `json:"timeout,omitempty"`
}
// UnregisterDatabaseResponse is the response body for the /unregister endpoint.
type UnregisterDatabaseResponse struct {
Status string `json:"status"`
Path string `json:"path"`
TXID uint64 `json:"txid"`
}
func (s *Server) handleRegister(w http.ResponseWriter, r *http.Request) {
var req RegisterDatabaseRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeJSONError(w, http.StatusBadRequest, "invalid request body", err.Error())
return
}
if req.Path == "" {
writeJSONError(w, http.StatusBadRequest, "path required", nil)
return
}
if req.ReplicaURL == "" {
writeJSONError(w, http.StatusBadRequest, "replica_url required", nil)
return
}
expandedPath, err := s.expandPath(req.Path)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid path: %v", err), nil)
return
}
// Check if database already exists.
if existing := s.store.FindDB(expandedPath); existing != nil {
writeJSON(w, http.StatusOK, RegisterDatabaseResponse{
Status: "already_registered",
Path: expandedPath,
})
return
}
// Create replica client from URL.
client, err := NewReplicaClientFromURL(req.ReplicaURL)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid replica url: %v", err), nil)
return
}
// Create new database.
db := NewDB(expandedPath)
// Create replica and attach client.
replica := NewReplica(db)
replica.Client = client
db.Replica = replica
// Register database with store (this also opens the database).
if err := s.store.RegisterDB(db); err != nil {
writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("failed to register database: %v", err), nil)
return
}
writeJSON(w, http.StatusOK, RegisterDatabaseResponse{
Status: "registered",
Path: expandedPath,
})
}
func (s *Server) handleUnregister(w http.ResponseWriter, r *http.Request) {
var req UnregisterDatabaseRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeJSONError(w, http.StatusBadRequest, "invalid request body", err.Error())
return
}
if req.Path == "" {
writeJSONError(w, http.StatusBadRequest, "path required", nil)
return
}
expandedPath, err := s.expandPath(req.Path)
if err != nil {
writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("invalid path: %v", err), nil)
return
}
// Set up timeout context. Treat non-positive values as default.
timeout := req.Timeout
if timeout <= 0 {
timeout = 30
}
ctx, cancel := context.WithTimeout(s.ctx, time.Duration(timeout)*time.Second)
defer cancel()
db := s.store.FindDB(expandedPath)
// Remove database from store (this also closes it).
if err := s.store.UnregisterDB(ctx, expandedPath); err != nil {
writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("failed to unregister database: %v", err), nil)
return
}
var txID uint64
status := "already_unregistered"
if db != nil {
_, maxTXID, err := db.MaxLTX()
if err != nil {
writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("failed to read final txid: %v", err), nil)
return
}
txID = uint64(maxTXID)
status = "unregistered"
}
writeJSON(w, http.StatusOK, UnregisterDatabaseResponse{
Status: status,
Path: expandedPath,
TXID: txID,
})
}
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