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package validation
import (
"fmt"
"strings"
"google.golang.org/genproto/googleapis/rpc/errdetails"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// Error represents a message validation error.
type Error struct {
fieldViolations []*errdetails.BadRequest_FieldViolation
grpcStatus *status.Status
str string
}
// NewError creates a new validation error from the provided field violations.
func NewError(fieldViolations []*errdetails.BadRequest_FieldViolation) error {
if len(fieldViolations) == 0 {
panic("validation.NewError: must provide at least one field violation")
}
return &Error{
fieldViolations: fieldViolations,
}
}
// GRPCStatus converts the validation error to a gRPC status with code INVALID_ARGUMENT.
func (e *Error) GRPCStatus() *status.Status {
if e.grpcStatus == nil {
var fields strings.Builder
for i, fieldViolation := range e.fieldViolations {
_, _ = fields.WriteString(fieldViolation.GetField())
if i < len(e.fieldViolations)-1 {
_, _ = fields.WriteString(", ")
}
}
withoutDetails := status.Newf(codes.InvalidArgument, "invalid fields: %s", fields.String())
if withDetails, err := withoutDetails.WithDetails(&errdetails.BadRequest{
FieldViolations: e.fieldViolations,
}); err != nil {
e.grpcStatus = withoutDetails
} else {
e.grpcStatus = withDetails
}
}
return e.grpcStatus
}
// Error implements the error interface.
func (e *Error) Error() string {
if e.str == "" {
if len(e.fieldViolations) == 1 {
e.str = fmt.Sprintf(
"field violation on %s: %s",
e.fieldViolations[0].GetField(),
e.fieldViolations[0].GetDescription(),
)
} else {
var result strings.Builder
_, _ = result.WriteString("field violation on multiple fields:\n")
for i, fieldViolation := range e.fieldViolations {
_, _ = result.WriteString(fmt.Sprintf(" | %s: %s", fieldViolation.GetField(), fieldViolation.GetDescription()))
if i < len(e.fieldViolations)-1 {
_ = result.WriteByte('\n')
}
}
e.str = result.String()
}
}
return e.str
}
|
