110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
package store
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import (
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"io"
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"io/ioutil"
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"net/http"
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"time"
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"github.com/lbryio/reflector.go/internal/metrics"
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"github.com/lbryio/reflector.go/meta"
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"github.com/lbryio/lbry.go/v2/extras/errors"
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"github.com/lbryio/lbry.go/v2/stream"
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log "github.com/sirupsen/logrus"
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)
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// CloudFrontROStore reads from cloudfront. All writes panic.
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type CloudFrontROStore struct {
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endpoint string // cloudflare endpoint
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}
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// NewCloudFrontROStore returns an initialized CloudFrontROStore store pointer.
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func NewCloudFrontROStore(endpoint string) *CloudFrontROStore {
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return &CloudFrontROStore{endpoint: endpoint}
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}
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const nameCloudFrontRO = "cloudfront_ro"
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// Name is the cache type name
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func (c *CloudFrontROStore) Name() string { return nameCloudFrontRO }
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// Has checks if the hash is in the store.
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func (c *CloudFrontROStore) Has(hash string) (bool, error) {
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status, body, err := c.cfRequest(http.MethodHead, hash)
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if err != nil {
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return false, err
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}
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defer body.Close()
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switch status {
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case http.StatusNotFound, http.StatusForbidden:
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return false, nil
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case http.StatusOK:
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return true, nil
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default:
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return false, errors.Err("unexpected status %d", status)
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}
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}
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// Get gets the blob from Cloudfront.
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func (c *CloudFrontROStore) Get(hash string) (stream.Blob, error) {
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log.Debugf("Getting %s from S3", hash[:8])
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defer func(t time.Time) {
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log.Debugf("Getting %s from S3 took %s", hash[:8], time.Since(t).String())
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}(time.Now())
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status, body, err := c.cfRequest(http.MethodGet, hash)
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if err != nil {
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return nil, err
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}
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defer body.Close()
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switch status {
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case http.StatusNotFound, http.StatusForbidden:
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return nil, errors.Err(ErrBlobNotFound)
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case http.StatusOK:
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b, err := ioutil.ReadAll(body)
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if err != nil {
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return nil, errors.Err(err)
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}
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metrics.MtrInBytesS3.Add(float64(len(b)))
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return b, nil
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default:
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return nil, errors.Err("unexpected status %d", status)
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}
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}
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func (c *CloudFrontROStore) cfRequest(method, hash string) (int, io.ReadCloser, error) {
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url := c.endpoint + hash
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req, err := http.NewRequest(method, url, nil)
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if err != nil {
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return 0, nil, errors.Err(err)
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}
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req.Header.Add("User-Agent", "reflector.go/"+meta.Version)
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res, err := http.DefaultClient.Do(req)
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if err != nil {
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return 0, nil, errors.Err(err)
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}
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return res.StatusCode, res.Body, nil
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}
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func (c *CloudFrontROStore) Put(_ string, _ stream.Blob) error {
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panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
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}
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func (c *CloudFrontROStore) PutSD(_ string, _ stream.Blob) error {
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panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
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}
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func (c *CloudFrontROStore) Delete(_ string) error {
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panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
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}
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// Shutdown shuts down the store gracefully
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func (c *CloudFrontROStore) Shutdown() {
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return
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}
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