implement fmt.Formatter in ErrorResponse (#11)

types.go

@@ -571,6 +571,32 @@ func (er ErrorResponse) Error() string {
 	return er.Detail
 }
 
+func (er ErrorResponse) Format(f fmt.State, c rune) {
+	switch c {
+	case 'v':
+		if f.Flag('+') {
+			meta := make([]string, 0, len(er.Meta.Errors))
+			for _, e := range er.Meta.Errors {
+				meta = append(meta,
+					fmt.Sprintf(
+						"(type [%s]; loc [%s]; input [%s]; msg [%s])",
+						e.Type, strings.Join(e.Loc, "."), e.Input, e.Message))
+			}
+
+			fmt.Fprintf(f, "error: %s (ID: %s; Status: %d; Code: %s); details: %s",
+				er.Detail, er.ID, er.Status, er.Code, strings.Join(meta, ", "))
+		} else {
+			fmt.Fprint(f, er.Detail)
+		}
+	case 's':
+		fmt.Fprint(f, er.Detail)
+	case 'q':
+		fmt.Fprintf(f, "%q", er.Detail)
+	default:
+		fmt.Fprint(f, er.Detail)
+	}
+}
+
 type ErrorMeta struct {
 	Component string           `json:"component"`
 	Errors    []ErrorMetaError `json:"errors"`
@@ -581,6 +607,7 @@ type ErrorMetaError struct {
 	Message string       `json:"msg"`
 	Type    string       `json:"type"`
 	Context ErrorContext `json:"ctx"`
+	Input   string       `json:"input"`
 }
 
 type ErrorContext struct {

types_test.go

@@ -2,9 +2,11 @@ package brave_test
 
 import (
 	"encoding/json"
+	"fmt"
 	"testing"
 
 	"dev.freespoke.com/brave-search"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -21,3 +23,18 @@ func TestTimestampUnmarshal(t *testing.T) {
 		require.False(t, ts.Time().IsZero(), c)
 	}
 }
+
+func TestErrorResponse(t *testing.T) {
+	var resp brave.ErrorResponse
+	if err := json.Unmarshal(errJSON, &resp); err != nil {
+		t.Fatal(err)
+	}
+
+	p := fmt.Sprintf("%+v", resp)
+	assert.Equal(t,
+		"error: Unable to validate request parameter(s) (ID: f49c8ffa-5ddc-4fbf-9841-6b3093c21eb2; Status: 422; Code: VALIDATION); details: (type [int_parsing]; loc [query.offset]; input [foo]; msg [Input should be a valid integer, unable to parse string as an integer])",
+		p,
+	)
+}
+
+var errJSON = []byte(`{"id": "f49c8ffa-5ddc-4fbf-9841-6b3093c21eb2","status": 422,"code": "VALIDATION","detail": "Unable to validate request parameter(s)","meta": {"errors": [{"type": "int_parsing","loc": ["query","offset"],"msg": "Input should be a valid integer, unable to parse string as an integer","input": "foo"}]}}`)