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stream.go
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stream.go
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package cmp
import (
"bufio"
"context"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"math"
"os"
"path/filepath"
"strings"
pluginclient "github.com/argoproj/argo-cd/v2/cmpserver/apiclient"
"github.com/argoproj/argo-cd/v2/common"
"github.com/argoproj/argo-cd/v2/util/io/files"
"github.com/argoproj/argo-cd/v2/util/tgzstream"
log "github.com/sirupsen/logrus"
)
// StreamSender defines the contract to send App files over stream
type StreamSender interface {
Send(*pluginclient.AppStreamRequest) error
}
// StreamReceiver defines the contract for receiving Application's files
// over gRPC stream
type StreamReceiver interface {
Recv() (*pluginclient.AppStreamRequest, error)
}
// ReceiveRepoStream will receive the repository files and save them
// in destDir. Will return the stream metadata if no error. Metadata
// will be nil in case of errors.
func ReceiveRepoStream(ctx context.Context, receiver StreamReceiver, destDir string) (*pluginclient.ManifestRequestMetadata, error) {
header, err := receiver.Recv()
if err != nil {
return nil, fmt.Errorf("error receiving stream header: %w", err)
}
if header == nil || header.GetMetadata() == nil {
return nil, fmt.Errorf("error getting stream metadata: metadata is nil")
}
metadata := header.GetMetadata()
tgzFile, err := receiveFile(ctx, receiver, metadata.GetChecksum(), destDir)
if err != nil {
return nil, fmt.Errorf("error receiving tgz file: %w", err)
}
err = files.Untgz(destDir, tgzFile, math.MaxInt64)
if err != nil {
return nil, fmt.Errorf("error decompressing tgz file: %w", err)
}
err = os.Remove(tgzFile.Name())
if err != nil {
log.Warnf("error removing the tgz file %q: %s", tgzFile.Name(), err)
}
return metadata, nil
}
// SenderOption defines the function type to by used by specific options
type SenderOption func(*senderOption)
type senderOption struct {
chunkSize int
tarDoneChan chan<- bool
}
func newSenderOption(opts ...SenderOption) *senderOption {
so := &senderOption{
chunkSize: common.GetCMPChunkSize(),
}
for _, opt := range opts {
opt(so)
}
return so
}
func WithTarDoneChan(ch chan<- bool) SenderOption {
return func(opt *senderOption) {
opt.tarDoneChan = ch
}
}
// SendRepoStream will compress the files under the given repoPath and send
// them using the plugin stream sender.
func SendRepoStream(ctx context.Context, appPath, repoPath string, sender StreamSender, env []string, excludedGlobs []string, opts ...SenderOption) error {
opt := newSenderOption(opts...)
// compress all files in appPath in tgz
tgz, filesWritten, checksum, err := tgzstream.CompressFiles(repoPath, nil, excludedGlobs)
if filesWritten == 0 {
return fmt.Errorf("no files to send")
}
if err != nil {
return fmt.Errorf("error compressing repo files: %w", err)
}
defer tgzstream.CloseAndDelete(tgz)
if opt.tarDoneChan != nil {
opt.tarDoneChan <- true
close(opt.tarDoneChan)
}
fi, err := tgz.Stat()
if err != nil {
return fmt.Errorf("error getting tgz stat: %w", err)
}
appRelPath, err := files.RelativePath(appPath, repoPath)
if err != nil {
return fmt.Errorf("error building app relative path: %s", err)
}
// send metadata first
mr := appMetadataRequest(filepath.Base(appPath), appRelPath, env, checksum, fi.Size())
err = sender.Send(mr)
if err != nil {
return fmt.Errorf("error sending generate manifest metadata to cmp-server: %w", err)
}
// send the compressed file
err = sendFile(ctx, sender, tgz, opt)
if err != nil {
return fmt.Errorf("error sending tgz file to cmp-server: %w", err)
}
return nil
}
// sendFile will send the file over the gRPC stream using a
// buffer.
func sendFile(ctx context.Context, sender StreamSender, file *os.File, opt *senderOption) error {
reader := bufio.NewReader(file)
chunk := make([]byte, opt.chunkSize)
for {
if ctx != nil {
if err := ctx.Err(); err != nil {
return fmt.Errorf("client stream context error: %w", err)
}
}
n, err := reader.Read(chunk)
if n > 0 {
fr := appFileRequest(chunk[:n])
if e := sender.Send(fr); e != nil {
return fmt.Errorf("error sending stream: %w", e)
}
}
if err != nil {
if err == io.EOF {
break
}
return fmt.Errorf("buffer reader error: %w", err)
}
}
return nil
}
// receiveFile will receive the file from the gRPC stream and save it in the dst folder.
// Returns error if checksum doesn't match the one provided in the fileMetadata.
// It is responsibility of the caller to close the returned file.
func receiveFile(ctx context.Context, receiver StreamReceiver, checksum, dst string) (*os.File, error) {
hasher := sha256.New()
file, err := os.CreateTemp(dst, "")
if err != nil {
return nil, fmt.Errorf("error creating file: %w", err)
}
for {
if ctx != nil {
if err := ctx.Err(); err != nil {
return nil, fmt.Errorf("stream context error: %w", err)
}
}
req, err := receiver.Recv()
if err != nil {
if err == io.EOF {
break
}
return nil, fmt.Errorf("stream Recv error: %w", err)
}
f := req.GetFile()
if f == nil {
return nil, fmt.Errorf("stream request file is nil")
}
_, err = file.Write(f.Chunk)
if err != nil {
return nil, fmt.Errorf("error writing file: %w", err)
}
_, err = hasher.Write(f.Chunk)
if err != nil {
return nil, fmt.Errorf("error writing hasher: %w", err)
}
}
if hex.EncodeToString(hasher.Sum(nil)) != checksum {
return nil, fmt.Errorf("file checksum validation error")
}
_, err = file.Seek(0, io.SeekStart)
if err != nil {
tgzstream.CloseAndDelete(file)
return nil, fmt.Errorf("seek error: %w", err)
}
return file, nil
}
// appFileRequest build the file payload for the ManifestRequest
func appFileRequest(chunk []byte) *pluginclient.AppStreamRequest {
return &pluginclient.AppStreamRequest{
Request: &pluginclient.AppStreamRequest_File{
File: &pluginclient.File{
Chunk: chunk,
},
},
}
}
// appMetadataRequest build the metadata payload for the ManifestRequest
func appMetadataRequest(appName, appRelPath string, env []string, checksum string, size int64) *pluginclient.AppStreamRequest {
return &pluginclient.AppStreamRequest{
Request: &pluginclient.AppStreamRequest_Metadata{
Metadata: &pluginclient.ManifestRequestMetadata{
AppName: appName,
AppRelPath: appRelPath,
Checksum: checksum,
Size_: size,
Env: toEnvEntry(env),
},
},
}
}
func toEnvEntry(envVars []string) []*pluginclient.EnvEntry {
envEntry := make([]*pluginclient.EnvEntry, 0)
for _, env := range envVars {
pair := strings.SplitN(env, "=", 2)
if len(pair) < 2 {
continue
}
envEntry = append(envEntry, &pluginclient.EnvEntry{Name: pair[0], Value: pair[1]})
}
return envEntry
}