/
server.go
228 lines (190 loc) · 4.99 KB
/
server.go
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package main
import (
"bytes"
"flag"
"fmt"
"hash"
"io"
"log"
"net"
"os"
"runtime/pprof"
"time"
"google.golang.org/grpc"
"github.com/glycerine/blake2b" // vendor https://github.com/dchest/blake2b"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
pb "github.com/glycerine/grpc-demo/streambigfile"
)
type PeerServer struct{}
func NewPeerServer() *PeerServer {
return &PeerServer{}
}
// implement pb.PeerServer interface
func (s *PeerServer) SendFile(stream pb.Peer_SendFileServer) error {
p("peer.Server SendFile starting!")
var chunkCount int64
path := ""
var bc int64
var hasher hash.Hash
var err error
hasher, err = blake2b.New(nil)
if err != nil {
return err
}
var finalChecksum []byte
var fd *os.File
defer func() {
if fd != nil {
fd.Close()
}
p("this server.SendFile() call got %v chunks, with "+
"final checksum '%x'", chunkCount, finalChecksum)
}()
firstChunkSeen := false
for {
nk, err := stream.Recv()
if err == io.EOF {
if nk != nil && len(nk.Data) > 0 {
// we are assuming that this never happens!
panic("we need to save this last chunk too!")
}
finalChecksum = []byte(hasher.Sum(nil))
endTime := time.Now()
return stream.SendAndClose(&pb.BigFileAck{
Filepath: path,
SizeInBytes: bc,
RecvTime: uint64(endTime.UnixNano()),
WholeFileBlake2B: finalChecksum,
})
}
if err != nil {
return err
}
// INVAR: we have a chunk
if !firstChunkSeen {
if nk.Filepath != "" {
fd, err = os.Create(nk.Filepath + fmt.Sprintf("__%v", time.Now()))
if err != nil {
return err
}
}
firstChunkSeen = true
}
hasher.Write(nk.Data)
cumul := []byte(hasher.Sum(nil))
if 0 != bytes.Compare(cumul, nk.Blake2BCumulative) {
return fmt.Errorf("cumulative checksums failed at chunk %v of '%s'. Observed: '%x', expected: '%x'.", nk.ChunkNumber, nk.Filepath, cumul, nk.Blake2BCumulative)
}
if path == "" {
path = nk.Filepath
p("peer.Server SendFile sees new file '%s'", path)
}
if path != "" && path != nk.Filepath {
panic(fmt.Errorf("confusing between two different streams! '%s' vs '%s'", path, nk.Filepath))
}
if nk.SizeInBytes != int64(len(nk.Data)) {
return fmt.Errorf("%v == nk.SizeInBytes != int64(len(nk.Data)) == %v", nk.SizeInBytes, int64(len(nk.Data)))
}
checksum := blake2bOfBytes(nk.Data)
cmp := bytes.Compare(checksum, nk.Blake2B)
if cmp != 0 {
return fmt.Errorf("chunk %v bad .Data, checksum mismatch!",
nk.ChunkNumber)
}
// INVAR: chunk passes tests, keep it.
bc += nk.SizeInBytes
chunkCount++
// TODO: user should store chunk somewhere here... or accumulate
// all the chunks in memory
// until ready to store it elsewhere; e.g. in boltdb.
// For example, we will write to the nk.Filepath, if specified.
if fd != nil {
rs := 0
for {
nw, err := fd.Write(nk.Data[rs:])
rs += nw
if rs == len(nk.Data) {
// wrote it all
break
}
if err == io.ErrShortWrite {
continue
}
if err != nil {
return err
}
}
}
}
return nil
}
const ProgramName = "server"
func main() {
myflags := flag.NewFlagSet(ProgramName, flag.ExitOnError)
cfg := &ServerConfig{}
cfg.DefineFlags(myflags)
sshegoCfg := setupSshFlags(myflags)
args := os.Args[1:]
err := myflags.Parse(args)
if cfg.CpuProfilePath != "" {
f, err := os.Create(cfg.CpuProfilePath)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
err = cfg.ValidateConfig()
if err != nil {
log.Fatalf("%s command line flag error: '%s'", ProgramName, err)
}
var gRpcBindPort int
var gRpcHost string
if cfg.UseTLS {
// use TLS
gRpcBindPort = cfg.ExternalLsnPort
gRpcHost = cfg.Host
p("gRPC with TLS listening on %v:%v", gRpcHost, gRpcBindPort)
} else {
// SSH will take the external, gRPC will take the internal.
gRpcBindPort = cfg.InternalLsnPort
gRpcHost = "127.0.0.1" // local only, behind the SSHD
p("external SSHd listening on %v:%v, internal gRPC service listening on 127.0.0.1:%v", cfg.Host, cfg.ExternalLsnPort, cfg.InternalLsnPort)
}
lis, err := net.Listen("tcp", fmt.Sprintf("%v:%d", gRpcHost, gRpcBindPort))
if err != nil {
grpclog.Fatalf("failed to listen: %v", err)
}
var opts []grpc.ServerOption
if cfg.UseTLS {
// use TLS
creds, err := credentials.NewServerTLSFromFile(cfg.CertPath, cfg.KeyPath)
if err != nil {
grpclog.Fatalf("Failed to generate credentials %v", err)
}
opts = []grpc.ServerOption{grpc.Creds(creds)}
} else {
// use SSH
err = serverSshMain(sshegoCfg, cfg.Host,
cfg.ExternalLsnPort, cfg.InternalLsnPort)
panicOn(err)
}
grpcServer := grpc.NewServer(opts...)
pb.RegisterPeerServer(grpcServer, NewPeerServer())
grpcServer.Serve(lis)
}
func blake2bOfBytes(by []byte) []byte {
h, err := blake2b.New(nil)
panicOn(err)
h.Write(by)
return []byte(h.Sum(nil))
}
func subtractArg(args []string, excludeMe string) (res []string) {
for _, v := range args {
if v != excludeMe {
res = append(res, v)
}
}
return
}