/
eval_cache_fetcher.go
151 lines (129 loc) · 3.2 KB
/
eval_cache_fetcher.go
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package handler
import (
"fmt"
jsoniter "github.com/json-iterator/go"
"io"
"net/http"
"os"
"github.com/openflagr/flagr/pkg/config"
"github.com/openflagr/flagr/pkg/entity"
"github.com/openflagr/flagr/pkg/util"
"gorm.io/gorm"
)
// EvalCacheJSON is the JSON serialization format of EvalCache's flags
type EvalCacheJSON struct {
Flags []entity.Flag
}
func (ec *EvalCache) export() EvalCacheJSON {
idCache := ec.cache.Load().(*cacheContainer).idCache
fs := make([]entity.Flag, 0, len(idCache))
for _, f := range idCache {
ff := *f
fs = append(fs, ff)
}
return EvalCacheJSON{Flags: fs}
}
func (ec *EvalCache) fetchAllFlags() (idCache map[string]*entity.Flag, keyCache map[string]*entity.Flag, tagCache map[string]map[uint]*entity.Flag, err error) {
fs, err := fetchAllFlags()
if err != nil {
return nil, nil, nil, err
}
idCache = make(map[string]*entity.Flag)
keyCache = make(map[string]*entity.Flag)
tagCache = make(map[string]map[uint]*entity.Flag)
for i := range fs {
f := &fs[i]
if err := f.PrepareEvaluation(); err != nil {
return nil, nil, nil, err
}
if f.ID != 0 {
idCache[util.SafeString(f.ID)] = f
}
if f.Key != "" {
keyCache[f.Key] = f
}
if f.Tags != nil {
for _, s := range f.Tags {
if tagCache[s.Value] == nil {
tagCache[s.Value] = make(map[uint]*entity.Flag)
}
tagCache[s.Value][f.ID] = f
}
}
}
return idCache, keyCache, tagCache, nil
}
type evalCacheFetcher interface {
fetch() ([]entity.Flag, error)
}
func newFetcher() (evalCacheFetcher, error) {
if !config.Config.EvalOnlyMode {
return &dbFetcher{db: getDB()}, nil
}
switch config.Config.DBDriver {
case "json_file":
return &jsonFileFetcher{filePath: config.Config.DBConnectionStr}, nil
case "json_http":
return &jsonHTTPFetcher{url: config.Config.DBConnectionStr}, nil
default:
return nil, fmt.Errorf(
"failed to create evaluation cache fetcher. DBDriver:%s is not supported",
config.Config.DBDriver,
)
}
}
var fetchAllFlags = func() ([]entity.Flag, error) {
fetcher, err := newFetcher()
if err != nil {
return nil, err
}
return fetcher.fetch()
}
type jsonFileFetcher struct {
filePath string
}
func (ff *jsonFileFetcher) fetch() ([]entity.Flag, error) {
var json = jsoniter.ConfigFastest
b, err := os.ReadFile(ff.filePath)
if err != nil {
return nil, err
}
ecj := &EvalCacheJSON{}
err = json.Unmarshal(b, ecj)
if err != nil {
return nil, err
}
return ecj.Flags, nil
}
type jsonHTTPFetcher struct {
url string
}
func (hf *jsonHTTPFetcher) fetch() ([]entity.Flag, error) {
var json = jsoniter.ConfigFastest
client := http.Client{Timeout: config.Config.EvalCacheRefreshTimeout}
res, err := client.Get(hf.url)
if err != nil {
return nil, err
}
defer res.Body.Close()
b, err := io.ReadAll(res.Body)
if err != nil {
return nil, err
}
ecj := &EvalCacheJSON{}
err = json.Unmarshal(b, ecj)
if err != nil {
return nil, err
}
return ecj.Flags, nil
}
type dbFetcher struct {
db *gorm.DB
}
func (df *dbFetcher) fetch() ([]entity.Flag, error) {
// Use eager loading to avoid N+1 problem
// doc: http://jinzhu.me/gorm/crud.html#preloading-eager-loading
fs := []entity.Flag{}
err := entity.PreloadSegmentsVariantsTags(df.db).Find(&fs).Error
return fs, err
}