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package output
import (
"context"
"fmt"
"io"
"strconv"
"github.com/Backblaze/blazer/b2"
"github.com/SayaAndy/saya-today-thumbnail-generator/config"
"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/input"
)
var _ OutputClient = (*B2OutputClient)(nil)
type B2OutputClient struct {
prefix string
bucket *b2.Bucket
b2cl *b2.Client
}
func NewB2OutputClient(cfg *config.OutputConfig) (OutputClient, error) {
if cfg.Storage.Type != "b2" {
return nil, fmt.Errorf("invalid storage type for B2OutputClient")
}
b2cfg := cfg.Storage.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 &B2OutputClient{b2cl: b2cl, bucket: bucket, prefix: b2cfg.Prefix}, nil
}
func (c *B2OutputClient) GetWriter(path string, inputMetadata *input.MetadataStruct) (io.WriteCloser, error) {
obj := c.bucket.Object(c.prefix + path)
if obj == nil {
return nil, fmt.Errorf("failed to reference object in B2 bucket")
}
attrs := &b2.Attrs{Info: make(map[string]string)}
attrs.Info["sha1-original"] = inputMetadata.Hash
return obj.NewWriter(context.Background(), b2.WithAttrsOption(attrs)), nil
}
func (c *B2OutputClient) ReadMetadata(path string) (*MetadataStruct, error) {
obj := c.bucket.Object(c.prefix + path)
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)
}
metadata := MetadataStruct{
Name: attrs.Name,
StorageType: "b2",
Hash: attrs.SHA1,
HashOriginal: attrs.Info["sha1-original"],
ContentType: attrs.ContentType,
FirstCreated: attrs.UploadTimestamp,
LastModified: attrs.LastModified,
Misc: attrs.Info,
}
metadata.Misc["Size"] = strconv.FormatInt(attrs.Size, 10)
switch attrs.Status {
case b2.Uploaded:
metadata.Misc["b2-status"] = "Uploaded"
case b2.Folder:
metadata.Misc["b2-status"] = "Folder"
case b2.Hider:
metadata.Misc["b2-status"] = "Hider"
case b2.Started:
metadata.Misc["b2-status"] = "Started"
default:
metadata.Misc["b2-status"] = "Unknown"
}
return &metadata, nil
}
func (c *B2OutputClient) IsMissing(path string) bool {
obj := c.bucket.Object(c.prefix + path)
if obj == nil {
return true
}
attrs, err := obj.Attrs(context.Background())
if err != nil {
return true
}
return attrs.Status == b2.Hider
}
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