distribution/storagedriver/ipc/server.go
Brian Bland 7c892deb1c Uses streams internally for ipc Get/Put Content
This is done because libchan/spdystream does not currently support sending
serialzied objects of size larger than 16MB
See https://github.com/docker/libchan/issues/65
2014-10-24 18:44:36 -07:00

167 lines
4.1 KiB
Go

package ipc
import (
"bytes"
"io"
"io/ioutil"
"net"
"os"
"github.com/docker/docker-registry/storagedriver"
"github.com/docker/libchan"
"github.com/docker/libchan/spdy"
)
func Server(driver storagedriver.StorageDriver) error {
childSocket := os.NewFile(3, "childSocket")
defer childSocket.Close()
conn, err := net.FileConn(childSocket)
if err != nil {
panic(err)
}
defer conn.Close()
if transport, err := spdy.NewServerTransport(conn); err != nil {
panic(err)
} else {
for {
receiver, err := transport.WaitReceiveChannel()
if err != nil {
panic(err)
}
go receive(driver, receiver)
}
return nil
}
}
func receive(driver storagedriver.StorageDriver, receiver libchan.Receiver) {
for {
var request Request
err := receiver.Receive(&request)
if err != nil {
panic(err)
}
go handleRequest(driver, request)
}
}
func handleRequest(driver storagedriver.StorageDriver, request Request) {
switch request.Type {
case "GetContent":
path, _ := request.Parameters["Path"].(string)
content, err := driver.GetContent(path)
var response ReadStreamResponse
if err != nil {
response = ReadStreamResponse{Error: ResponseError(err)}
} else {
response = ReadStreamResponse{Reader: WrapReader(bytes.NewReader(content))}
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
case "PutContent":
path, _ := request.Parameters["Path"].(string)
reader, _ := request.Parameters["Reader"].(io.ReadCloser)
contents, err := ioutil.ReadAll(reader)
defer reader.Close()
if err == nil {
err = driver.PutContent(path, contents)
}
response := WriteStreamResponse{
Error: ResponseError(err),
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
case "ReadStream":
var offset uint64
path, _ := request.Parameters["Path"].(string)
offset, ok := request.Parameters["Offset"].(uint64)
if !ok {
offsetSigned, _ := request.Parameters["Offset"].(int64)
offset = uint64(offsetSigned)
}
reader, err := driver.ReadStream(path, offset)
var response ReadStreamResponse
if err != nil {
response = ReadStreamResponse{Error: ResponseError(err)}
} else {
response = ReadStreamResponse{Reader: WrapReader(reader)}
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
case "WriteStream":
var offset uint64
path, _ := request.Parameters["Path"].(string)
offset, ok := request.Parameters["Offset"].(uint64)
if !ok {
offsetSigned, _ := request.Parameters["Offset"].(int64)
offset = uint64(offsetSigned)
}
size, ok := request.Parameters["Size"].(uint64)
if !ok {
sizeSigned, _ := request.Parameters["Size"].(int64)
size = uint64(sizeSigned)
}
reader, _ := request.Parameters["Reader"].(io.ReadCloser)
err := driver.WriteStream(path, offset, size, reader)
response := WriteStreamResponse{
Error: ResponseError(err),
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
case "ResumeWritePosition":
path, _ := request.Parameters["Path"].(string)
position, err := driver.ResumeWritePosition(path)
response := ResumeWritePositionResponse{
Position: position,
Error: ResponseError(err),
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
case "List":
prefix, _ := request.Parameters["Prefix"].(string)
keys, err := driver.List(prefix)
response := ListResponse{
Keys: keys,
Error: ResponseError(err),
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
case "Move":
sourcePath, _ := request.Parameters["SourcePath"].(string)
destPath, _ := request.Parameters["DestPath"].(string)
err := driver.Move(sourcePath, destPath)
response := MoveResponse{
Error: ResponseError(err),
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
case "Delete":
path, _ := request.Parameters["Path"].(string)
err := driver.Delete(path)
response := DeleteResponse{
Error: ResponseError(err),
}
err = request.ResponseChannel.Send(&response)
if err != nil {
panic(err)
}
default:
panic(request)
}
}