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main.go
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main.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package main
import (
"fmt"
"io"
"os"
"time"
"github.com/m3db/m3/src/cmd/tools"
"github.com/m3db/m3/src/dbnode/persist/fs"
"github.com/m3db/m3x/ident"
xlog "github.com/m3db/m3x/log"
"github.com/pborman/getopt"
)
func main() {
var (
optPathPrefix = getopt.StringLong("path-prefix", 'p', "", "Path prefix [e.g. /var/lib/m3db]")
optNamespace = getopt.StringLong("namespace", 'n', "", "Namespace [e.g. metrics]")
optShard = getopt.Uint32Long("shard", 's', 0, "Shard ID [expected format uint32]")
optBlockstart = getopt.Int64Long("block-start", 'b', 0, "Block Start Time [in nsec]")
log = xlog.NewLogger(os.Stderr)
)
getopt.Parse()
if *optPathPrefix == "" ||
*optNamespace == "" ||
*optShard < 0 ||
*optBlockstart <= 0 {
getopt.Usage()
os.Exit(1)
}
bytesPool := tools.NewCheckedBytesPool()
bytesPool.Init()
fsOpts := fs.NewOptions().SetFilePathPrefix(*optPathPrefix)
reader, err := fs.NewReader(bytesPool, fsOpts)
if err != nil {
log.Fatalf("could not create new reader: %v", err)
}
openOpts := fs.DataReaderOpenOptions{
Identifier: fs.FileSetFileIdentifier{
Namespace: ident.StringID(*optNamespace),
Shard: *optShard,
BlockStart: time.Unix(0, *optBlockstart),
},
}
err = reader.Open(openOpts)
if err != nil {
log.Fatalf("unable to open reader: %v", err)
}
for {
id, _, _, _, err := reader.ReadMetadata()
if err == io.EOF {
break
}
if err != nil {
log.Fatalf("err reading metadata: %v", err)
}
// Use fmt package so it goes to stdout instead of stderr
fmt.Println(id.String())
}
}