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|
package storage
import (
"context"
"fmt"
"io"
"strings"
"time"
"github.com/Backblaze/blazer/b2"
"github.com/SayaAndy/saya-today-article-metadata-add/config"
"github.com/SayaAndy/saya-today-article-metadata-add/internal/frontmatter"
)
var _ StorageClient = &B2StorageClient{}
type B2StorageClient struct {
prefix string
bucket *b2.Bucket
b2cl *b2.Client
}
func NewB2StorageClient(cfg *config.StorageConfig) (StorageClient, error) {
if cfg.Type != "b2" {
return nil, fmt.Errorf("invalid storage type for B2InputClient")
}
b2cfg := cfg.Config.(*config.B2Config)
b2cl, err := b2.NewClient(context.Background(), b2cfg.KeyID, b2cfg.ApplicationKey)
if err != nil {
return nil, err
}
bucket, err := b2cl.Bucket(context.Background(), b2cfg.BucketName)
if err != nil {
return nil, err
}
return &B2StorageClient{b2cl: b2cl, bucket: bucket, prefix: b2cfg.Prefix}, nil
}
func (sc *B2StorageClient) Scan() ([]string, error) {
filePaths := []string{}
iter := sc.bucket.List(context.Background(), b2.ListPrefix(sc.prefix))
for iter.Next() {
obj := iter.Object()
if obj == nil {
return nil, fmt.Errorf("failed to reference object in B2 bucket")
}
attrs, err := obj.Attrs(context.Background())
if err != nil {
return nil, fmt.Errorf("get attributes for object: %w", err)
}
if attrs.Status != b2.Uploaded {
continue
}
name := obj.Name()
nameParts := strings.Split(name, ".")
if len(nameParts) < 2 {
continue
}
ext := strings.ToLower(nameParts[len(nameParts)-1])
if ext != "md" {
continue
}
filePaths = append(filePaths, strings.TrimPrefix(name, sc.prefix))
}
if err := iter.Err(); err != nil {
return nil, fmt.Errorf("iterate over B2 objects: %w", err)
}
return filePaths, nil
}
func (sc *B2StorageClient) GetReader(path string) (io.ReadCloser, int64, error) {
obj := sc.bucket.Object(sc.prefix + path)
if obj == nil {
return nil, 0, fmt.Errorf("failed to reference object in B2 bucket")
}
attrs, err := obj.Attrs(context.Background())
if err != nil {
return nil, 0, fmt.Errorf("error getting attributes of an object: %w", err)
}
return obj.NewReader(context.Background()), attrs.Size, nil
}
func (sc *B2StorageClient) WriteMetadata(path string, metadata *frontmatter.Metadata) error {
obj := sc.bucket.Object(sc.prefix + path)
if obj == nil {
return fmt.Errorf("failed to reference object in B2 bucket")
}
oldAttrs, err := obj.Attrs(context.Background())
if err != nil {
return fmt.Errorf("error getting attributes of an object: %w", err)
}
attrs := &b2.Attrs{Info: map[string]string{
"title": metadata.Title,
"short-description": metadata.ShortDescription,
"action-date": metadata.ActionDate,
"published-time": metadata.PublishedTime.Format(time.RFC3339),
"thumbnail": metadata.Thumbnail,
"tags": strings.Join(metadata.Tags, ","),
"metadata-last-update-sha1": oldAttrs.SHA1,
}}
writer := obj.NewWriter(context.Background(), b2.WithAttrsOption(attrs))
writer.Close()
return nil
}
func (sc *B2StorageClient) FileHasChanged(path string) bool {
obj := sc.bucket.Object(sc.prefix + path)
if obj == nil {
return true
}
attrs, err := obj.Attrs(context.Background())
if err != nil {
return true
}
lastUpdateSha1, ok := attrs.Info["metadata-last-update-sha1"]
if !ok {
return true
}
return attrs.SHA1 == lastUpdateSha1
}
|
