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resend on error, retries, preserve file permissions

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This commit is contained in:
postmannen 2022-06-15 14:47:20 +02:00
parent 2745374da3
commit 97ef587a0e
1 changed files with 132 additions and 10 deletions
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142
requests_copy.go
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@ -5,6 +5,7 @@ import (
"crypto/sha256"
"fmt"
"io"
"io/fs"
"log"
"os"
"path/filepath"
@ -24,6 +25,7 @@ type copyInitialData struct {
DstDir string
DstFile string
SplitChunkSize int
FileMode fs.FileMode
}
type methodREQCopySrc struct {
@ -137,6 +139,16 @@ func (m methodREQCopySrc) handler(proc process, message Message, node string) ([
dstSubProcessName := fmt.Sprintf("REQSUBCopyDst.%v", uid.String())
dstM := Method(dstSubProcessName)
// Get the file permissions
fileInfo, err := os.Stat(SrcFilePath)
if err != nil {
// errCh <- fmt.Errorf("error: methodREQCopyFile: failed to open file: %v, %v", SrcFilePath, err)
log.Printf("error: copySrcSubProcFunc: failed to stat file: %v\n", err)
return
}
fileMode := fileInfo.Mode()
cia := copyInitialData{
UUID: uid.String(),
SrcNode: proc.node,
@ -147,6 +159,7 @@ func (m methodREQCopySrc) handler(proc process, message Message, node string) ([
DstDir: dstDir,
DstFile: dstFile,
SplitChunkSize: splitChunkSize,
FileMode: fileMode,
}
sub := newSubjectNoVerifyHandler(m, node)
@ -302,9 +315,10 @@ func copyDstSubHandler(cia copyInitialData) func(process, Message, string) ([]by
type copyStatus int
const (
copyReady copyStatus = 1
copyData copyStatus = 2
copyDone copyStatus = 3
copyReady copyStatus = 1
copyData copyStatus = 2
copyDone copyStatus = 3
copyResendLast copyStatus = 4
)
// copySubData is the structure being used between the src and dst while copying data.
@ -319,8 +333,11 @@ func copySrcSubProcFunc(proc process, cia copyInitialData) func(context.Context,
pf := func(ctx context.Context, procFuncCh chan Message) error {
var chunkNumber = 0
var lastReadChunk []byte
var resendRetries int
// Initiate the file copier.
fh, err := os.Open(cia.SrcFilePath)
if err != nil {
// errCh <- fmt.Errorf("error: methodREQCopyFile: failed to open file: %v, %v", SrcFilePath, err)
@ -360,6 +377,8 @@ func copySrcSubProcFunc(proc process, cia copyInitialData) func(context.Context,
status = copyDone
}
lastReadChunk = b
// Create a hash of the bytes
hash := sha256.Sum256(b)
@ -399,6 +418,64 @@ func copySrcSubProcFunc(proc process, cia copyInitialData) func(context.Context,
proc.toRingbufferCh <- []subjectAndMessage{sam}
resendRetries = 0
// Testing with contect canceling here.
// proc.ctxCancel()
case copyResendLast:
if resendRetries > message.Retries {
er := fmt.Errorf("error: %v: failed to resend the chunk for the %v time, giving up", cia.DstMethod, resendRetries)
proc.errorKernel.errSend(proc, message, er)
// NB: Should we call cancel here, or wait for the timeout ?
proc.ctxCancel()
}
// HERE!
b := lastReadChunk
status := copyData
// Create a hash of the bytes
hash := sha256.Sum256(b)
chunkNumber++
// Create message and send data to dst
fmt.Printf("**** DATA READ: %v\n", b)
csa := copySubData{
CopyStatus: status,
CopyData: b,
ChunkNumber: chunkNumber,
Hash: hash,
}
csaSerialized, err := cbor.Marshal(csa)
if err != nil {
log.Fatalf("error: copyDstSubProcFunc: cbor marshal of csa failed: %v\n", err)
}
// We want to send a message back to src that we are ready to start.
fmt.Printf("\n\n\n ************** DEBUG: copyDstHandler sub process sending copyReady to:%v\n ", message.FromNode)
msg := Message{
ToNode: cia.DstNode,
FromNode: cia.SrcNode,
Method: cia.DstMethod,
ReplyMethod: REQNone,
Data: csaSerialized,
}
fmt.Printf("\n ***** DEBUG: copyDstSubProcFunc: cia.SrcMethod: %v\n\n ", cia.SrcMethod)
sam, err := newSubjectAndMessage(msg)
if err != nil {
log.Fatalf("copyDstProcSubFunc: newSubjectAndMessage failed: %v\n", err)
}
proc.toRingbufferCh <- []subjectAndMessage{sam}
resendRetries++
default:
// TODO: Any error logic here ?
log.Fatalf("error: copySrcSubProcFunc: not valid copyStatus, exiting: %v\n", csa.CopyStatus)
@ -464,10 +541,13 @@ func copyDstSubProcFunc(proc process, cia copyInitialData, message Message) func
log.Fatalf("error: copySrcSubHandler: cbor unmarshal of csa failed: %v\n", err)
}
// Check if the hash matches.
// Check if the hash matches. If it fails we set the status so we can
// trigger the resend of the last message in the switch below.
hash := sha256.Sum256(csa.CopyData)
if hash != csa.Hash {
log.Fatalf("error: hash of received message is not correct\n")
log.Printf("error: copyDstSubProcFunc: hash of received message is not correct for: %v\n", cia.DstMethod)
csa.CopyStatus = copyResendLast
}
fmt.Printf(" * DEBUG: Hash was verified OK\n")
@ -496,7 +576,7 @@ func copyDstSubProcFunc(proc process, cia copyInitialData, message Message) func
CopyStatus: copyReady,
}
csaSerialized, err := cbor.Marshal(csa)
csaSer, err := cbor.Marshal(csa)
if err != nil {
log.Fatalf("error: copyDstSubProcFunc: cbor marshal of csa failed: %v\n", err)
}
@ -507,7 +587,33 @@ func copyDstSubProcFunc(proc process, cia copyInitialData, message Message) func
FromNode: cia.DstNode,
Method: cia.SrcMethod,
ReplyMethod: REQNone,
Data: csaSerialized,
Data: csaSer,
}
fmt.Printf("\n ***** DEBUG: copyDstSubProcFunc: cia.SrcMethod: %v\n\n ", cia.SrcMethod)
sam, err := newSubjectAndMessage(msg)
if err != nil {
log.Fatalf("copyDstProcSubFunc: newSubjectAndMessage failed: %v\n", err)
}
proc.toRingbufferCh <- []subjectAndMessage{sam}
case copyResendLast:
// The csa already contains copyStatus copyResendLast when reached here,
// so we can just serialize csa, and send a message back to sourcde for
// resend of the last message.
csaSer, err := cbor.Marshal(csa)
if err != nil {
log.Fatalf("error: copyDstSubProcFunc: cbor marshal of csa failed: %v\n", err)
}
msg := Message{
ToNode: cia.SrcNode,
FromNode: cia.DstNode,
Method: cia.SrcMethod,
ReplyMethod: REQNone,
Data: csaSer,
}
fmt.Printf("\n ***** DEBUG: copyDstSubProcFunc: cia.SrcMethod: %v\n\n ", cia.SrcMethod)
@ -525,9 +631,15 @@ func copyDstSubProcFunc(proc process, cia copyInitialData, message Message) func
// var mainFileData []byte
func() {
// Open the main file that chunks files will be written into.
filePath := filepath.Join(cia.DstDir, cia.DstFile)
mainfh, err := os.OpenFile(filePath, os.O_TRUNC|os.O_RDWR|os.O_CREATE|os.O_SYNC, 0600)
// Rename the file so we got a backup.
backupOriginalFileName := filePath + ".bck"
os.Rename(filePath, backupOriginalFileName)
mainfh, err := os.OpenFile(filePath, os.O_TRUNC|os.O_RDWR|os.O_CREATE|os.O_SYNC, cia.FileMode)
if err != nil {
log.Fatalf("error: copyDstSubProcFunc: open file failed: %v\n", err)
}
@ -562,15 +674,25 @@ func copyDstSubProcFunc(proc process, cia copyInitialData, message Message) func
return err
}
// mainFileData = append(mainFileData, b...)
// TODO: delete tmp files
}
return nil
})
if err != nil {
log.Fatalf("error: copyDstSubProcFunc: filewalk failed: %v\n", err)
log.Printf("error: copyDstSubProcFunc: combining the file chunks back to original file failed: %v\n", err)
// Delete the file we've been trying to write to.
os.Remove(filePath)
// Rename the old file back to it's original name.
os.Rename(backupOriginalFileName, filePath)
return
}
// All ok, remove the backup file
os.Remove(backupOriginalFileName)
// fmt.Printf("main file contains: %v\n", mainFileData)
}()
}