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errors.go
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errors.go
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package call
import (
"fmt"
"github.com/TiagoMalhadas/xcweaver/runtime/codegen"
)
type transportError int
const (
// CommunicationError is the type of the error returned by a call when some
// communication error is encountered, typically a process or network
// error. Check for it via errors.Is(call.CommunicationError).
CommunicationError transportError = iota
// Unreachable is the type of the error returned by a call when every
// server is unreachable. Check for it via errors.Is(call.Unreachable).
Unreachable
// TODO: Decide what error most applications will want to check for. We may
// need to combine CommunicationError and Unreachable. We may also want to
// make errors.Is(CommunicationError) return true for both types of errors.
// This is doable by defining transportError.Is (https://pkg.go.dev/errors#Is)
)
// Error implements the error interface.
func (e transportError) Error() string {
switch e {
case CommunicationError:
return "communication error"
case Unreachable:
return "unreachable"
default:
return fmt.Sprintf("unknown error %d", e)
}
}
func encodeError(err error) []byte {
// TODO(sanjay): There is a tiny risk that encoding the error will fail if
// we end up generating a string whose length does not fit in four bytes.
// We chose to ignore that possibility since it is rare and it is hard
// to figure out what to do in that case (we could attempt to encode another
// error, but that itself could perhaps fail). A future change should fix
// this problem.
e := codegen.NewEncoder()
e.Error(err)
return e.Data()
}
func decodeError(msg []byte) (err error, ok bool) {
defer func() {
if x := codegen.CatchPanics(recover()); x != nil {
err = x
}
}()
dec := codegen.NewDecoder(msg)
err = dec.Error()
ok = true
return
}