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Merge pull request #6117 from filecoin-project/opt/elvindu/snapimport…
…-resume Auto-resume interrupted snapshot imports / 自动重链快照导入失败时
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,121 @@ | ||
package httpreader | ||
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import ( | ||
"context" | ||
"fmt" | ||
"io" | ||
"net/http" | ||
"strconv" | ||
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logging "github.com/ipfs/go-log/v2" | ||
"go.uber.org/multierr" | ||
) | ||
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var log = logging.Logger("httpreader") | ||
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type ResumableReader struct { | ||
ctx context.Context | ||
initialURL string | ||
finalURL *string | ||
position int64 | ||
contentLength int64 | ||
client *http.Client | ||
reader io.ReadCloser | ||
} | ||
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func NewResumableReader(ctx context.Context, url string) (*ResumableReader, error) { | ||
finalURL := "" | ||
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client := &http.Client{ | ||
CheckRedirect: func(req *http.Request, via []*http.Request) error { | ||
finalURL = req.URL.String() | ||
if len(via) >= 10 { | ||
return fmt.Errorf("stopped after 10 redirects") | ||
} | ||
return nil | ||
}, | ||
} | ||
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r := &ResumableReader{ | ||
ctx: ctx, | ||
initialURL: url, | ||
finalURL: &finalURL, | ||
position: 0, | ||
client: client, | ||
} | ||
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req, err := http.NewRequestWithContext(ctx, "GET", url, nil) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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resp, err := r.client.Do(req) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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if resp.StatusCode != http.StatusOK { | ||
return nil, fmt.Errorf("failed to fetch resource, status code: %d", resp.StatusCode) | ||
} | ||
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contentLength, err := strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64) | ||
if err != nil { | ||
if err = resp.Body.Close(); err != nil { | ||
err = multierr.Append(err, err) | ||
} | ||
return nil, err | ||
} | ||
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r.contentLength = contentLength | ||
r.reader = resp.Body | ||
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return r, nil | ||
} | ||
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func (r *ResumableReader) ContentLength() int64 { | ||
return r.contentLength | ||
} | ||
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func (r *ResumableReader) Read(p []byte) (n int, err error) { | ||
for { | ||
if r.reader == nil { | ||
reqURL := r.initialURL | ||
if *r.finalURL != "" { | ||
reqURL = *r.finalURL | ||
} | ||
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req, err := http.NewRequestWithContext(r.ctx, "GET", reqURL, nil) | ||
if err != nil { | ||
return 0, err | ||
} | ||
req.Header.Set("Range", fmt.Sprintf("bytes=%d-", r.position)) | ||
resp, err := r.client.Do(req) | ||
if err != nil { | ||
return 0, err | ||
} | ||
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if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusPartialContent { | ||
return 0, fmt.Errorf("non-resumable status code: %d", resp.StatusCode) | ||
} | ||
r.reader = resp.Body | ||
} | ||
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n, err = r.reader.Read(p) | ||
r.position += int64(n) | ||
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if err == io.EOF || err == io.ErrUnexpectedEOF { | ||
if r.position == r.contentLength { | ||
if err := r.reader.Close(); err != nil { | ||
log.Warnf("error closing reader: %+v", err) | ||
} | ||
return n, io.EOF | ||
} | ||
if err := r.reader.Close(); err != nil { | ||
log.Warnf("error closing reader: %+v", err) | ||
} | ||
r.reader = nil | ||
} else { | ||
return n, err | ||
} | ||
} | ||
} |