73 lines
1.4 KiB
Go
73 lines
1.4 KiB
Go
package cache
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import (
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"fmt"
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"io"
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"net"
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"net/http"
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"sync"
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"sync/atomic"
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"time"
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"golang.org/x/sync/singleflight"
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)
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const userAgent = "pacman/7.1.0 (Linux x86_64) libalpm/16.0.1"
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type Cache struct {
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cfg CacheConfig
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mirrorIdx atomic.Uint64
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sf singleflight.Group //prevents duplicate downloads
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mu sync.Mutex
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client http.Client
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}
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type CacheConfig struct {
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cacheRoot string
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mirrorURLs []string
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mirroredRepos []string
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DialTimeout time.Duration
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ResponseHeaderTimeout time.Duration
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ClientTimeout time.Duration
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}
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type CacheFile struct {
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Reader io.ReadCloser
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Size int64
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Filename string
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}
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func NewCache(cacheRoot string, mirrorURLs []string, mirroredRepos []string) *Cache {
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cfg := CacheConfig{
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cacheRoot: cacheRoot,
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mirrorURLs: mirrorURLs,
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mirroredRepos: mirroredRepos,
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DialTimeout: 5 * time.Second,
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ResponseHeaderTimeout: 10 * time.Second,
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ClientTimeout: 0 * time.Second,
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}
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transport := &http.Transport{
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DialContext: (&net.Dialer{
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Timeout: cfg.DialTimeout,
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}).DialContext,
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ResponseHeaderTimeout: cfg.ResponseHeaderTimeout,
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}
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return &Cache{
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cfg: cfg,
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client: http.Client{
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Timeout: cfg.ClientTimeout,
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Transport: transport,
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},
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}
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}
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type UpstreamError struct {
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StatusCode int
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}
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func (e *UpstreamError) Error() string {
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return fmt.Sprintf("upstream returned %d", e.StatusCode)
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}
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