seaweedfs/weed/shell/command_fs_cat.go

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package shell
import (
"fmt"
"io"
"math"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
func init() {
Commands = append(Commands, &commandFsCat{})
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}
type commandFsCat struct {
}
func (c *commandFsCat) Name() string {
return "fs.cat"
}
func (c *commandFsCat) Help() string {
return `stream the file content on to the screen
fs.cat /dir/file_name
`
}
func (c *commandFsCat) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
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path, err := commandEnv.parseUrl(findInputDirectory(args))
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if err != nil {
return err
}
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if commandEnv.isDirectory(path) {
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return fmt.Errorf("%s is a directory", path)
}
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dir, name := util.FullPath(path).DirAndName()
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return commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
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request := &filer_pb.LookupDirectoryEntryRequest{
Name: name,
Directory: dir,
}
respLookupEntry, err := filer_pb.LookupEntry(client, request)
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if err != nil {
return err
}
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if len(respLookupEntry.Entry.Content) > 0 {
_, err = writer.Write(respLookupEntry.Entry.Content)
return err
}
return filer.StreamContent(commandEnv.MasterClient, writer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64)
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})
}