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144 lines
3.0 KiB
Go
144 lines
3.0 KiB
Go
// Errors and error handling
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package fs
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import (
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strings"
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"github.com/pkg/errors"
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)
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// Retry is an optional interface for error as to whether the
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// operation should be retried at a high level.
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//
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// This should be returned from Update or Put methods as required
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type Retry interface {
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error
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Retry() bool
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}
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// retryError is a type of error
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type retryError string
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// Error interface
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func (r retryError) Error() string {
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return string(r)
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}
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// Retry interface
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func (r retryError) Retry() bool {
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return true
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}
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// Check interface
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var _ Retry = retryError("")
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// RetryErrorf makes an error which indicates it would like to be retried
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func RetryErrorf(format string, a ...interface{}) error {
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return retryError(fmt.Sprintf(format, a...))
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}
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// PlainRetryError is an error wrapped so it will retry
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type plainRetryError struct {
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error
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}
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// Retry interface
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func (err plainRetryError) Retry() bool {
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return true
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}
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// Check interface
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var _ Retry = plainRetryError{(error)(nil)}
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// RetryError makes an error which indicates it would like to be retried
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func RetryError(err error) error {
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return plainRetryError{err}
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}
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// IsRetryError returns true if err conforms to the Retry interface
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// and calling the Retry method returns true.
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func IsRetryError(err error) bool {
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if r, ok := err.(Retry); ok {
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return r.Retry()
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}
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return false
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}
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// isClosedConnError reports whether err is an error from use of a closed
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// network connection.
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//
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// Code adapted from net/http
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func isClosedConnError(err error) bool {
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if err == nil {
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return false
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}
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// Note that this error isn't exported so we have to do a
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// string comparison :-(
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str := err.Error()
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if strings.Contains(str, "use of closed network connection") {
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return true
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}
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return isClosedConnErrorPlatform(err)
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}
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// ShouldRetry looks at an error and tries to work out if retrying the
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// operation that caused it would be a good idea. It returns true if
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// the error implements Timeout() or Temporary() or if the error
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// indicates a premature closing of the connection.
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func ShouldRetry(err error) bool {
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if err == nil {
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return false
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}
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// Find root cause if available
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err = errors.Cause(err)
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// Unwrap url.Error
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if urlErr, ok := err.(*url.Error); ok {
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err = urlErr.Err
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}
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// Look for premature closing of connection
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if err == io.EOF || err == io.ErrUnexpectedEOF || isClosedConnError(err) {
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return true
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}
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// Check for net error Timeout()
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if x, ok := err.(interface {
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Timeout() bool
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}); ok && x.Timeout() {
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return true
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}
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// Check for net error Temporary()
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if x, ok := err.(interface {
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Temporary() bool
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}); ok && x.Temporary() {
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return true
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}
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return false
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}
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// ShouldRetryHTTP returns a boolean as to whether this resp deserves.
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// It checks to see if the HTTP response code is in the slice
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// retryErrorCodes.
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func ShouldRetryHTTP(resp *http.Response, retryErrorCodes []int) bool {
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if resp == nil {
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return false
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}
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for _, e := range retryErrorCodes {
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if resp.StatusCode == e {
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return true
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}
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}
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return false
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}
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