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systemerror.go
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systemerror.go
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package types
import (
"fmt"
"reflect"
)
// SystemError captures all errors returned from the Rust code as SystemError.
// Exactly one of the fields should be set.
type SystemError struct {
InvalidRequest *InvalidRequest `json:"invalid_request,omitempty"`
InvalidResponse *InvalidResponse `json:"invalid_response,omitempty"`
NoSuchContract *NoSuchContract `json:"no_such_contract,omitempty"`
Unknown *Unknown `json:"unknown,omitempty"`
UnsupportedRequest *UnsupportedRequest `json:"unsupported_request,omitempty"`
}
var (
_ error = SystemError{}
_ error = InvalidRequest{}
_ error = InvalidResponse{}
_ error = NoSuchContract{}
_ error = Unknown{}
_ error = UnsupportedRequest{}
)
func (a SystemError) Error() string {
switch {
case a.InvalidRequest != nil:
return a.InvalidRequest.Error()
case a.InvalidResponse != nil:
return a.InvalidResponse.Error()
case a.NoSuchContract != nil:
return a.NoSuchContract.Error()
case a.Unknown != nil:
return a.Unknown.Error()
case a.UnsupportedRequest != nil:
return a.UnsupportedRequest.Error()
default:
panic("unknown error variant")
}
}
type InvalidRequest struct {
Err string `json:"error"`
Request []byte `json:"request"`
}
func (e InvalidRequest) Error() string {
return fmt.Sprintf("invalid request: %s - original request: %s", e.Err, string(e.Request))
}
type InvalidResponse struct {
Err string `json:"error"`
Response []byte `json:"response"`
}
func (e InvalidResponse) Error() string {
return fmt.Sprintf("invalid response: %s - original response: %s", e.Err, string(e.Response))
}
type NoSuchContract struct {
Addr string `json:"addr,omitempty"`
}
func (e NoSuchContract) Error() string {
return fmt.Sprintf("no such contract: %s", e.Addr)
}
type Unknown struct{}
func (e Unknown) Error() string {
return "unknown system error"
}
type UnsupportedRequest struct {
Kind string `json:"kind,omitempty"`
}
func (e UnsupportedRequest) Error() string {
return fmt.Sprintf("unsupported request: %s", e.Kind)
}
// ToSystemError will try to convert the given error to an SystemError.
// This is important to returning any Go error back to Rust.
//
// If it is already StdError, return self.
// If it is an error, which could be a sub-field of StdError, embed it.
// If it is anything else, **return nil**
//
// This may return nil on an unknown error, whereas ToStdError will always create
// a valid error type.
func ToSystemError(err error) *SystemError {
if isNil(err) {
return nil
}
switch t := err.(type) {
case SystemError:
return &t
case *SystemError:
return t
case InvalidRequest:
return &SystemError{InvalidRequest: &t}
case *InvalidRequest:
return &SystemError{InvalidRequest: t}
case InvalidResponse:
return &SystemError{InvalidResponse: &t}
case *InvalidResponse:
return &SystemError{InvalidResponse: t}
case NoSuchContract:
return &SystemError{NoSuchContract: &t}
case *NoSuchContract:
return &SystemError{NoSuchContract: t}
case Unknown:
return &SystemError{Unknown: &t}
case *Unknown:
return &SystemError{Unknown: t}
case UnsupportedRequest:
return &SystemError{UnsupportedRequest: &t}
case *UnsupportedRequest:
return &SystemError{UnsupportedRequest: t}
default:
return nil
}
}
// check if an interface is nil (even if it has type info)
func isNil(i interface{}) bool {
if i == nil {
return true
}
if reflect.TypeOf(i).Kind() == reflect.Ptr {
// IsNil panics if you try it on a struct (not a pointer)
return reflect.ValueOf(i).IsNil()
}
// if we aren't a pointer, can't be nil, can we?
return false
}