http.go

Documentation: github.com/goph/emperror/httperr

     1  package httperr
     2  
     3  import (
     4  	"fmt"
     5  	"io"
     6  	"net/http"
     7  
     8  	"github.com/goph/emperror"
     9  )
    10  
    11  // WithHTTPRequest attaches an HTTP request to the error.
    12  func WithHTTPRequest(err error, r *http.Request) error {
    13  	return &withHTTPRequest{
    14  		req: r,
    15  		err: err,
    16  	}
    17  }
    18  
    19  // HTTPRequest extracts an HTTP request from an error (if any).
    20  //
    21  // It loops through the whole error chain (if any).
    22  func HTTPRequest(err error) (*http.Request, bool) {
    23  	type httpError interface {
    24  		HTTPRequest() *http.Request
    25  	}
    26  
    27  	var req *http.Request
    28  
    29  	emperror.ForEachCause(err, func(err error) bool {
    30  		if httpErr, ok := err.(httpError); ok {
    31  			req = httpErr.HTTPRequest()
    32  
    33  			return false
    34  		}
    35  
    36  		return true
    37  	})
    38  
    39  	return req, req != nil
    40  }
    41  
    42  type withHTTPRequest struct {
    43  	req *http.Request
    44  	err error
    45  }
    46  
    47  func (w *withHTTPRequest) Error() string {
    48  	return w.err.Error()
    49  }
    50  
    51  func (w *withHTTPRequest) Cause() error {
    52  	return w.err
    53  }
    54  
    55  func (w *withHTTPRequest) HTTPRequest() *http.Request {
    56  	return w.req
    57  }
    58  
    59  func (w *withHTTPRequest) Format(s fmt.State, verb rune) {
    60  	switch verb {
    61  	case 'v':
    62  		if s.Flag('+') {
    63  			_, _ = fmt.Fprintf(s, "%+v", w.Cause())
    64  
    65  			return
    66  		}
    67  
    68  		fallthrough
    69  
    70  	case 's':
    71  		_, _ = io.WriteString(s, w.Error())
    72  
    73  	case 'q':
    74  		_, _ = fmt.Fprintf(s, "%q", w.Error())
    75  	}
    76  }
    77
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