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sync.go
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sync.go
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// Copyright (c) Facebook, Inc. and its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package nvd
import (
"context"
"fmt"
"os"
"strings"
)
// Syncer is an abstract interface for data feed synchronizers.
type Syncer interface {
Sync(ctx context.Context, src SourceConfig, localdir string) error
}
// SyncError accumulates errors occured during Sync.Do() call.
type SyncError []string
// Error implements error interface.
func (se SyncError) Error() string {
if len(se) == 0 {
return ""
}
sfx := ""
if len(se) > 1 {
sfx = "s"
}
return fmt.Sprintf("%d synchronisation error%s:\n\t%s", len(se), sfx, strings.Join(se, "\n\t"))
}
// Sync provides full synchronization between remote and local data feeds.
type Sync struct {
Feeds []Syncer
Source *SourceConfig
LocalDir string
}
// Do executes the synchronization.
func (s Sync) Do(ctx context.Context) error {
err := os.MkdirAll(s.LocalDir, 0755)
if err != nil {
return err
}
src := s.Source
if src == nil {
src = NewSourceConfig()
}
vsrc := *src
var errors SyncError
for _, feed := range s.Feeds {
if err = feed.Sync(ctx, vsrc, s.LocalDir); err != nil {
errors = append(errors, err.Error())
}
}
if len(errors) == 0 {
return nil
}
return errors
}