shell: add fs.cat

weed/shell/command_fs_cat.go

@@ -0,0 +1,69 @@
+package shell
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"math"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/server"
+)
+
+func init() {
+	commands = append(commands, &commandFsCat{})
+}
+
+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/
+	fs.cat /dir/file_name
+	fs.cat /dir/file_prefix
+	fs.cat http://<filer_server>:<port>/dir/
+	fs.cat http://<filer_server>:<port>/dir/file_name
+	fs.cat http://<filer_server>:<port>/dir/file_prefix
+`
+}
+
+func (c *commandFsCat) Do(args []string, commandEnv *commandEnv, writer io.Writer) (err error) {
+
+	input := findInputDirectory(args)
+
+	filerServer, filerPort, path, err := commandEnv.parseUrl(input)
+	if err != nil {
+		return err
+	}
+
+	ctx := context.Background()
+
+	if commandEnv.isDirectory(ctx, filerServer, filerPort, path) {
+		return fmt.Errorf("%s is a directory", path)
+	}
+
+	dir, name := filer2.FullPath(path).DirAndName()
+
+	return commandEnv.withFilerClient(ctx, filerServer, filerPort, func(client filer_pb.SeaweedFilerClient) error {
+
+		request := &filer_pb.LookupDirectoryEntryRequest{
+			Name:      name,
+			Directory: dir,
+		}
+		respLookupEntry, err := client.LookupDirectoryEntry(ctx, request)
+		if err != nil {
+			return err
+		}
+
+		return weed_server.StreamContent(commandEnv.masterClient, writer, respLookupEntry.Entry.Chunks, 0, math.MaxInt32)
+
+	})
+
+}