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snapshot.go
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snapshot.go
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// MIT License
//
// Copyright (c) 2020 Lack
//
// 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 cli
import (
"errors"
"fmt"
"net/url"
"github.com/lack-io/cli"
log "github.com/lack-io/vine/lib/logger"
"github.com/lack-io/vine/lib/store/cli/snapshot"
)
// Snapshot in the entrypoint for vine store snapshot
func Snapshot(ctx *cli.Context) error {
s, err := makeStore(ctx)
if err != nil {
return fmt.Errorf("%w couldn't construct a store", err)
}
dest := ctx.String("destination")
var sn snapshot.Snapshot
if len(dest) == 0 {
return errors.New("destination flag must be set")
}
u, err := url.Parse(dest)
if err != nil {
return fmt.Errorf("%w destination is invalid", err)
}
switch u.Scheme {
case "file":
sn = snapshot.NewFileSnapshot(snapshot.Destination(dest))
default:
return fmt.Errorf("unsupported destination scheme: %s", u.Scheme)
}
err = sn.Init()
if err != nil {
return fmt.Errorf("%w failed to initialise the snapshotter", err)
}
log.Debugf("Snapshotting store %s", s.String())
recordChan, err := sn.Start()
if err != nil {
return fmt.Errorf("%w couldn't start the snapshotter", err)
}
keys, err := s.List()
if err != nil {
return fmt.Errorf("%w couldn't List() from store "+s.String(), err)
}
log.Debugf("Snapshotting %d keys", len(keys))
for _, key := range keys {
r, err := s.Read(key)
if err != nil {
return fmt.Errorf("%w couldn't read key %s", err, key)
}
if len(r) != 1 {
return fmt.Errorf("reading %s from %s returned 0 records", key, s.String())
}
recordChan <- r[0]
}
close(recordChan)
sn.Wait()
return nil
}