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package storage
import (
"context"
"fmt"
"io"
"strconv"
"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
draftModeCfg *config.DraftModeConfig
}
func NewB2StorageClient(cfg *config.StorageConfig, draftModeCfg *config.DraftModeConfig) (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
}
draftModeCfgCopy := *draftModeCfg
return &B2StorageClient{b2cl: b2cl, bucket: bucket, prefix: b2cfg.Prefix, draftModeCfg: &draftModeCfgCopy}, 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()
if !strings.HasSuffix(name, ".md") {
continue
}
if sc.draftModeCfg.Enabled && !strings.HasSuffix(name, sc.draftModeCfg.DraftSuffix) {
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 {
draft := sc.bucket.Object(sc.prefix + path)
if draft == nil {
return fmt.Errorf("failed to reference draft object in B2 bucket")
}
draftAttrs, err := draft.Attrs(context.Background())
if err != nil {
return fmt.Errorf("error getting attributes of a draft object: %w", err)
}
geolocationParts := strings.Split(metadata.Geolocation, " ")
if (len(geolocationParts) == 1 && geolocationParts[0] != "") || len(geolocationParts) >= 4 {
return fmt.Errorf("invalid geolocation format, expecting '{x} {y} [areaError]' or an empty string")
}
if len(geolocationParts) >= 2 {
if _, err := strconv.ParseFloat(geolocationParts[0], 64); err != nil {
return fmt.Errorf("invalid geolocation parameter, expected float for X: %w", err)
}
if _, err := strconv.ParseFloat(geolocationParts[1], 64); err != nil {
return fmt.Errorf("invalid geolocation parameter, expected float for Y: %w", err)
}
}
if len(geolocationParts) == 3 {
if _, err := strconv.ParseFloat(geolocationParts[2], 64); err != nil {
return fmt.Errorf("invalid geolocation parameter, expected float for area error: %w", err)
}
}
medley := ""
if metadata.Medley != "" {
medley = fmt.Sprintf("%s %d", metadata.Medley, metadata.MedleyPart)
}
attrs := &b2.Attrs{
ContentType: "text/markdown; charset=utf-8",
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, ","),
"geolocation": metadata.Geolocation,
"medley": medley,
"metadata-last-update-sha1": draftAttrs.SHA1,
}}
reader := draft.NewReader(context.Background())
content := make([]byte, draftAttrs.Size)
if _, err = reader.Read(content); err != nil {
return fmt.Errorf("failed to read a draft object back for writing (required for attribute setting): %w", err)
}
var prod *b2.Object
if sc.draftModeCfg.Enabled {
prodPath := strings.TrimSuffix(path, sc.draftModeCfg.DraftSuffix) + sc.draftModeCfg.ProdSuffix
prod = sc.bucket.Object(sc.prefix + prodPath)
if prod == nil {
return fmt.Errorf("failed to reference prod object in B2 bucket")
}
} else {
prod = draft
}
writer := prod.NewWriter(context.Background(), b2.WithAttrsOption(attrs))
defer writer.Close()
if _, err := writer.Write(content); err != nil {
return fmt.Errorf("failed to write an object back after attribute settings: %w", err)
}
return nil
}
func (sc *B2StorageClient) CompareDraftAndProd(path string) (changed bool) {
draft := sc.bucket.Object(sc.prefix + path)
if draft == nil {
return false
}
prodPath := strings.TrimSuffix(path, sc.draftModeCfg.DraftSuffix) + sc.draftModeCfg.ProdSuffix
prod := sc.bucket.Object(sc.prefix + prodPath)
if prod == nil {
return true
}
draftAttrs, err := draft.Attrs(context.Background())
if err != nil {
return false
}
prodAttrs, err := prod.Attrs(context.Background())
if err != nil {
return true
}
lastUpdateSha1, ok := prodAttrs.Info["metadata-last-update-sha1"]
if !ok {
return true
}
return draftAttrs.SHA1 != lastUpdateSha1
}
|
