seaweedfs/weed/command/filer_cat.go
chrislu 9f9ef1340c use streaming mode for long poll grpc calls
streaming mode would create separate grpc connections for each call.
this is to ensure the long poll connections are properly closed.
2021-12-26 00:15:03 -08:00

124 lines
3 KiB
Go

package command
import (
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/wdclient"
"google.golang.org/grpc"
"math"
"net/url"
"os"
"strings"
"github.com/chrislusf/seaweedfs/weed/security"
"github.com/chrislusf/seaweedfs/weed/util"
)
var (
filerCat FilerCatOptions
)
type FilerCatOptions struct {
grpcDialOption grpc.DialOption
filerAddress pb.ServerAddress
filerClient filer_pb.SeaweedFilerClient
output *string
}
func (fco *FilerCatOptions) GetLookupFileIdFunction() wdclient.LookupFileIdFunctionType {
return func(fileId string) (targetUrls []string, err error) {
vid := filer.VolumeId(fileId)
resp, err := fco.filerClient.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
VolumeIds: []string{vid},
})
if err != nil {
return nil, err
}
locations := resp.LocationsMap[vid]
for _, loc := range locations.Locations {
targetUrls = append(targetUrls, fmt.Sprintf("http://%s/%s", loc.Url, fileId))
}
return
}
}
func init() {
cmdFilerCat.Run = runFilerCat // break init cycle
filerCat.output = cmdFilerCat.Flag.String("o", "", "write to file instead of stdout")
}
var cmdFilerCat = &Command{
UsageLine: "filer.cat [-o <file>] http://localhost:8888/path/to/file",
Short: "copy one file to local",
Long: `read one file to stdout or write to a file
`,
}
func runFilerCat(cmd *Command, args []string) bool {
util.LoadConfiguration("security", false)
if len(args) == 0 {
return false
}
filerSource := args[len(args)-1]
filerUrl, err := url.Parse(filerSource)
if err != nil {
fmt.Printf("The last argument should be a URL on filer: %v\n", err)
return false
}
urlPath := filerUrl.Path
if strings.HasSuffix(urlPath, "/") {
fmt.Printf("The last argument should be a file: %v\n", err)
return false
}
filerCat.filerAddress = pb.ServerAddress(filerUrl.Host)
filerCat.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
dir, name := util.FullPath(urlPath).DirAndName()
writer := os.Stdout
if *filerCat.output != "" {
fmt.Printf("saving %s to %s\n", filerSource, *filerCat.output)
f, err := os.OpenFile(*filerCat.output, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
if err != nil {
fmt.Printf("open file %s: %v\n", *filerCat.output, err)
return false
}
defer f.Close()
writer = f
}
pb.WithFilerClient(false, filerCat.filerAddress, filerCat.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
request := &filer_pb.LookupDirectoryEntryRequest{
Name: name,
Directory: dir,
}
respLookupEntry, err := filer_pb.LookupEntry(client, request)
if err != nil {
return err
}
if len(respLookupEntry.Entry.Content) > 0 {
_, err = writer.Write(respLookupEntry.Entry.Content)
return err
}
filerCat.filerClient = client
return filer.StreamContent(&filerCat, writer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64)
})
return true
}