micro/util/file/handler.go

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package file
import (
"io"
"os"
"path/filepath"
"sync"
"github.com/unistack-org/micro/v3/errors"
"github.com/unistack-org/micro/v3/logger"
"github.com/unistack-org/micro/v3/server"
proto "github.com/unistack-org/micro/v3/util/file/proto"
"golang.org/x/net/context"
)
// NewHandler is a handler that can be registered with a micro Server
func NewHandler(readDir string) proto.FileHandler {
return &handler{
readDir: readDir,
session: &session{
files: make(map[int64]*os.File),
},
}
}
// RegisterHandler is a convenience method for registering a handler
func RegisterHandler(s server.Server, readDir string) {
proto.RegisterFileHandler(s, NewHandler(readDir))
}
type handler struct {
readDir string
session *session
}
func (h *handler) Open(ctx context.Context, req *proto.OpenRequest, rsp *proto.OpenResponse) error {
path := filepath.Join(h.readDir, req.Filename)
flags := os.O_CREATE | os.O_RDWR
if req.GetTruncate() {
flags = flags | os.O_TRUNC
}
file, err := os.OpenFile(path, flags, 0666)
if err != nil {
return errors.InternalServerError("go.micro.server", err.Error())
}
rsp.Id = h.session.Add(file)
rsp.Result = true
logger.Debugf("Open %s, sessionId=%d", req.Filename, rsp.Id)
return nil
}
func (h *handler) Close(ctx context.Context, req *proto.CloseRequest, rsp *proto.CloseResponse) error {
h.session.Delete(req.Id)
logger.Debugf("Close sessionId=%d", req.Id)
return nil
}
func (h *handler) Stat(ctx context.Context, req *proto.StatRequest, rsp *proto.StatResponse) error {
path := filepath.Join(h.readDir, req.Filename)
fi, err := os.Stat(path)
if os.IsNotExist(err) {
return errors.InternalServerError("go.micro.srv.file", err.Error())
}
if fi.IsDir() {
rsp.Type = "Directory"
} else {
rsp.Type = "File"
rsp.Size = fi.Size()
}
rsp.LastModified = fi.ModTime().Unix()
logger.Debugf("Stat %s, %#v", req.Filename, rsp)
return nil
}
func (h *handler) Read(ctx context.Context, req *proto.ReadRequest, rsp *proto.ReadResponse) error {
file := h.session.Get(req.Id)
if file == nil {
return errors.InternalServerError("go.micro.srv.file", "You must call open first.")
}
rsp.Data = make([]byte, req.Size)
n, err := file.ReadAt(rsp.Data, req.Offset)
if err != nil && err != io.EOF {
return errors.InternalServerError("go.micro.srv.file", err.Error())
}
if err == io.EOF {
rsp.Eof = true
}
rsp.Size = int64(n)
rsp.Data = rsp.Data[:n]
logger.Debugf("Read sessionId=%d, Offset=%d, n=%d", req.Id, req.Offset, rsp.Size)
return nil
}
func (h *handler) Write(ctx context.Context, req *proto.WriteRequest, rsp *proto.WriteResponse) error {
file := h.session.Get(req.Id)
if file == nil {
return errors.InternalServerError("go.micro.srv.file", "You must call open first.")
}
if _, err := file.WriteAt(req.GetData(), req.GetOffset()); err != nil {
return err
}
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logger.Debugf("Write session id=%d, Offset=%d,", req.Id, req.Offset)
return nil
}
type session struct {
sync.Mutex
files map[int64]*os.File
counter int64
}
func (s *session) Add(file *os.File) int64 {
s.Lock()
defer s.Unlock()
s.counter += 1
s.files[s.counter] = file
return s.counter
}
func (s *session) Get(id int64) *os.File {
s.Lock()
defer s.Unlock()
return s.files[id]
}
func (s *session) Delete(id int64) {
s.Lock()
defer s.Unlock()
if file, exist := s.files[id]; exist {
file.Close()
delete(s.files, id)
}
}
func (s *session) Len() int {
return len(s.files)
}