3b391d3290
Go 1.18 and up now provides a strings.Cut() which is better suited for
splitting key/value pairs (and similar constructs), and performs better:
```go
func BenchmarkSplit(b *testing.B) {
b.ReportAllocs()
data := []string{"12hello=world", "12hello=", "12=hello", "12hello"}
for i := 0; i < b.N; i++ {
for _, s := range data {
_ = strings.SplitN(s, "=", 2)[0]
}
}
}
func BenchmarkCut(b *testing.B) {
b.ReportAllocs()
data := []string{"12hello=world", "12hello=", "12=hello", "12hello"}
for i := 0; i < b.N; i++ {
for _, s := range data {
_, _, _ = strings.Cut(s, "=")
}
}
}
```
BenchmarkSplit
BenchmarkSplit-10 8244206 128.0 ns/op 128 B/op 4 allocs/op
BenchmarkCut
BenchmarkCut-10 54411998 21.80 ns/op 0 B/op 0 allocs/op
While looking at occurrences of `strings.Split()`, I also updated some for alternatives,
or added some constraints;
- for cases where an specific number of items is expected, I used `strings.SplitN()`
with a suitable limit. This prevents (theoretical) unlimited splits.
- in some cases it we were using `strings.Split()`, but _actually_ were trying to match
a prefix; for those I replaced the code to just match (and/or strip) the prefix.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
85 lines
2.5 KiB
Go
85 lines
2.5 KiB
Go
package handlers
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strconv"
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"strings"
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dcontext "github.com/distribution/distribution/v3/context"
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)
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// closeResources closes all the provided resources after running the target
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// handler.
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func closeResources(handler http.Handler, closers ...io.Closer) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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for _, closer := range closers {
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defer closer.Close()
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}
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handler.ServeHTTP(w, r)
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})
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}
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// copyFullPayload copies the payload of an HTTP request to destWriter. If it
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// receives less content than expected, and the client disconnected during the
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// upload, it avoids sending a 400 error to keep the logs cleaner.
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//
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// The copy will be limited to `limit` bytes, if limit is greater than zero.
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func copyFullPayload(ctx context.Context, responseWriter http.ResponseWriter, r *http.Request, destWriter io.Writer, limit int64, action string) error {
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// Get a channel that tells us if the client disconnects
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clientClosed := r.Context().Done()
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body := r.Body
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if limit > 0 {
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body = http.MaxBytesReader(responseWriter, body, limit)
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}
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// Read in the data, if any.
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copied, err := io.Copy(destWriter, body)
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if clientClosed != nil && (err != nil || (r.ContentLength > 0 && copied < r.ContentLength)) {
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// Didn't receive as much content as expected. Did the client
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// disconnect during the request? If so, avoid returning a 400
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// error to keep the logs cleaner.
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select {
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case <-clientClosed:
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// Set the response code to "499 Client Closed Request"
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// Even though the connection has already been closed,
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// this causes the logger to pick up a 499 error
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// instead of showing 0 for the HTTP status.
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responseWriter.WriteHeader(499)
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dcontext.GetLoggerWithFields(ctx, map[interface{}]interface{}{
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"error": err,
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"copied": copied,
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"contentLength": r.ContentLength,
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}, "error", "copied", "contentLength").Error("client disconnected during " + action)
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return errors.New("client disconnected")
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default:
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}
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}
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if err != nil {
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dcontext.GetLogger(ctx).Errorf("unknown error reading request payload: %v", err)
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return err
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}
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return nil
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}
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func parseContentRange(cr string) (start int64, end int64, err error) {
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rStart, rEnd, ok := strings.Cut(cr, "-")
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if !ok {
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return -1, -1, fmt.Errorf("invalid content range format, %s", cr)
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}
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start, err = strconv.ParseInt(rStart, 10, 64)
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if err != nil {
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return -1, -1, err
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}
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end, err = strconv.ParseInt(rEnd, 10, 64)
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if err != nil {
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return -1, -1, err
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}
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return start, end, nil
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}
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