mirror of
https://github.com/navidrome/navidrome.git
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108 lines
2.5 KiB
Go
108 lines
2.5 KiB
Go
package utils
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import (
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"bufio"
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"bytes"
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"encoding/base64"
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"encoding/json"
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"io"
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"net/http"
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"strings"
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"time"
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"github.com/jellydator/ttlcache/v2"
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"github.com/navidrome/navidrome/log"
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)
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const cacheSizeLimit = 100
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type CachedHTTPClient struct {
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cache *ttlcache.Cache
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hc httpDoer
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}
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type httpDoer interface {
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Do(req *http.Request) (*http.Response, error)
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}
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type requestData struct {
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Method string
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Header http.Header
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URL string
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Body *string
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}
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func NewCachedHTTPClient(wrapped httpDoer, ttl time.Duration) *CachedHTTPClient {
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c := &CachedHTTPClient{hc: wrapped}
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c.cache = ttlcache.NewCache()
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c.cache.SetCacheSizeLimit(cacheSizeLimit)
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c.cache.SkipTTLExtensionOnHit(true)
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c.cache.SetLoaderFunction(func(key string) (interface{}, time.Duration, error) {
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req, err := c.deserializeReq(key)
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if err != nil {
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return nil, 0, err
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}
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resp, err := c.hc.Do(req)
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if err != nil {
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return nil, 0, err
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}
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defer resp.Body.Close()
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return c.serializeResponse(resp), ttl, nil
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})
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c.cache.SetNewItemCallback(func(key string, value interface{}) {
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log.Trace("New request cached", "req", key, "resp", value)
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})
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return c
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}
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func (c *CachedHTTPClient) Do(req *http.Request) (*http.Response, error) {
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key := c.serializeReq(req)
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respStr, err := c.cache.Get(key)
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if err != nil {
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return nil, err
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}
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return c.deserializeResponse(req, respStr.(string))
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}
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func (c *CachedHTTPClient) serializeReq(req *http.Request) string {
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data := requestData{
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Method: req.Method,
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Header: req.Header,
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URL: req.URL.String(),
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}
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if req.Body != nil {
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bodyData, _ := io.ReadAll(req.Body)
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bodyStr := base64.StdEncoding.EncodeToString(bodyData)
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data.Body = &bodyStr
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}
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j, _ := json.Marshal(&data)
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return string(j)
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}
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func (c *CachedHTTPClient) deserializeReq(reqStr string) (*http.Request, error) {
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var data requestData
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_ = json.Unmarshal([]byte(reqStr), &data)
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var body io.Reader
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if data.Body != nil {
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bodyStr, _ := base64.StdEncoding.DecodeString(*data.Body)
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body = strings.NewReader(string(bodyStr))
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}
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req, err := http.NewRequest(data.Method, data.URL, body)
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if err != nil {
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return nil, err
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}
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req.Header = data.Header
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return req, nil
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}
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func (c *CachedHTTPClient) serializeResponse(resp *http.Response) string {
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var b = &bytes.Buffer{}
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_ = resp.Write(b)
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return b.String()
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}
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func (c *CachedHTTPClient) deserializeResponse(req *http.Request, respStr string) (*http.Response, error) {
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r := bufio.NewReader(strings.NewReader(respStr))
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return http.ReadResponse(r, req)
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}
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