/
server.go
232 lines (205 loc) · 4.88 KB
/
server.go
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package daemon
import (
"context"
"fmt"
"io/fs"
"log"
"net"
"os"
"path/filepath"
"regexp"
"syscall"
"time"
"github.com/dnjp/zync/proto/zync/v1"
"github.com/dnjp/zync/watcher"
shell "github.com/ipfs/go-ipfs-api"
"google.golang.org/grpc"
)
// Server provides a gRPC interface for interacting
// with watched files stored in IPFS
type Server struct {
srv *grpc.Server
lis net.Listener
store *watcher.Datastore
zync.UnimplementedZyncServer
}
// NewServer constructs a new gPRC server for the daemon
func NewServer(port int, sh *shell.Shell, backupLoc string, refreshInterval time.Duration) (*Server, error) {
lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", port))
if err != nil {
return nil, err
}
store, err := watcher.NewDatastore(sh, backupLoc, refreshInterval)
if err != nil {
return nil, err
}
s := &Server{
srv: grpc.NewServer(),
lis: lis,
store: store,
}
zync.RegisterZyncServer(s.srv, s)
return s, nil
}
// HandleTerminate stops the server if terminate signal
// is received
func (s *Server) HandleTerminate(sig os.Signal) error {
switch sig {
case syscall.SIGQUIT:
case syscall.SIGTERM:
return s.Stop()
}
return nil
}
// Start launches the gRPC server
func (s *Server) Start() error {
log.Println("grpc server listening...")
errs := make(chan error)
go func() { errs <- s.store.Start() }()
go func() { errs <- s.srv.Serve(s.lis) }()
return <-errs
}
// Stop gracefully stops the gRPC server
func (s *Server) Stop() error {
s.srv.GracefulStop()
log.Println("grpc server stopped")
return s.store.Stop()
}
func isFilePath(path string) bool {
var err error
path, err = filepath.Abs(path)
if err != nil {
return false
}
_, err = os.Stat(path)
if err != nil {
return false
}
return true
}
// AddFiles adds a single file to IPFS if the provided
// path is to an individual file, or it will recursively
// add all files within a directory if the provided path
// is a directory
func (s *Server) AddFiles(req *zync.RegexRequest, afs zync.Zync_AddFilesServer) error {
if req.Pattern == "" {
return fmt.Errorf("must provide pattern")
}
// received an absolute path
if isFilePath(req.Pattern) {
file, err := s.store.AddFile(watcher.FilePath(req.Pattern))
if err != nil {
return err
}
if err := afs.Send(file.Status()); err != nil {
return err
}
} else {
regex, err := regexp.Compile(req.Pattern)
if err != nil {
return err
}
err = filepath.Walk(req.CurrentDirectory, func(path string, info fs.FileInfo, err error) error {
if regex.MatchString(path) {
file, err := s.store.AddFile(watcher.FilePath(path))
if err != nil {
return err
}
if err := afs.Send(file.Status()); err != nil {
return err
}
}
return nil
})
if err != nil {
return err
}
}
return nil
}
// ListFiles lists all files matching the pattern from
// zync
func (s *Server) ListFiles(req *zync.RegexRequest, lfs zync.Zync_ListFilesServer) error {
var regex *regexp.Regexp
if req.Pattern != "" {
var err error
regex, err = regexp.Compile(req.Pattern)
if err != nil {
return err
}
}
var returnErr error
s.store.RangeStore(func(file *watcher.File) (done bool) {
shouldSend := false
if regex != nil {
if regex.MatchString(file.AbsolutePath.String()) {
shouldSend = true
}
} else {
shouldSend = true
}
if shouldSend {
if err := lfs.Send(file.Status()); err != nil {
returnErr = err
return true
}
}
return false
})
if returnErr != nil {
return returnErr
}
return nil
}
// DeleteFiles removes all files matching the pattern
// from zync
func (s *Server) DeleteFiles(req *zync.RegexRequest, dfs zync.Zync_DeleteFilesServer) error {
var regex *regexp.Regexp
if req.Pattern != "" {
var err error
regex, err = regexp.Compile(req.Pattern)
if err != nil {
return err
}
}
filesToRemove := make(map[watcher.FilePath]*watcher.File)
var returnErr error
s.store.RangeStore(func(file *watcher.File) (done bool) {
shouldSend := false
if regex != nil {
if regex.MatchString(file.AbsolutePath.String()) {
shouldSend = true
}
} else {
shouldSend = true
}
if shouldSend {
filesToRemove[file.AbsolutePath] = file
}
return false
})
if returnErr != nil {
return returnErr
}
for path, file := range filesToRemove {
log.Printf("removing file %s\n", path)
if err := s.store.RemoveFile(path); err != nil {
return err
}
if err := dfs.Send(file.Status()); err != nil {
return err
}
}
return nil
}
// Backup communicates to the server that any cached
// data should be backed up to IPFS, returning the
// resulting CID
func (s *Server) Backup(ctx context.Context, req *zync.BackupRequest) (*zync.BackupStatus, error) {
return nil, fmt.Errorf("TODO")
}
// Restore initiates the process of restoring files
// from IPFS to the host machine
func (s *Server) Restore(req *zync.RestoreRequest, rs zync.Zync_RestoreServer) error {
return fmt.Errorf("TODO")
}