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main.go
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main.go
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// Copyright (c) 2023 Alan Parra
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package main
import (
"flag"
"fmt"
"io"
"os"
"text/template"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"golang.org/x/exp/slices"
"google.golang.org/grpc/codes"
)
var outFile = flag.String("o", "-", "Output file. Use '-' for os.Stdout.")
type codeInfo struct {
Num int
HTTP int
HTTPSkip bool
Name string
Desc string
Semerr string
}
var generateT = template.Must(template.
New("generate").
Parse(`// Copyright (c) 2023 Alan Parra
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// Code generated by ./internal/cmd/generate. DO NOT EDIT.
package semerr
var errFromCode = map[Code]func(error) error{
{{- range $i, $info := .infos}}
{{$info.Num | printf "%d:" | printf "%-3s"}} func(err error) error { return {{$info.Semerr}}{err} },
{{- end}}
}
var errFromStatus = map[int]func(error) error{
{{- range $i, $info := .infos}}
{{if $info.HTTPSkip}}// {{end}}
{{- $info.HTTP}}: func(err error) error { return {{$info.Semerr}}{err} },
{{- end}}
}
{{- range $i, $info := .infos}}
// {{$info.Semerr}} is the semantic error for {{$info.Name}}.
type {{$info.Semerr}} struct{ Err error }
// Error returns Err.Error() or {{$info.Desc | printf "%q" }}.
func (e {{$info.Semerr}}) Error() string {
if e.Err == nil {
return {{$info.Desc | printf "%q" }}
}
return e.Err.Error()
}
// Unwrap returns Err.
func (e {{$info.Semerr}}) Unwrap() error { return e.Err }
// GRPCCode returns {{$info.Name}}.
func ({{$info.Semerr}}) GRPCCode() Code { return {{$info.Num}} }
// HTTPStatus returns {{$info.HTTP}}.
func ({{$info.Semerr}}) HTTPStatus() int { return {{$info.HTTP}} }
{{- end}}
`))
func main() {
flag.Parse()
if err := run(); err != nil {
panic(err)
}
}
func run() error {
var out io.Writer
if *outFile == "-" {
out = os.Stdout
} else {
var err error
out, err = os.OpenFile(*outFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
}
infos := make([]codeInfo, len(allCodes))
for i, c := range allCodes {
infos[i] = codeInfo{
Num: int(c),
HTTP: runtime.HTTPStatusFromCode(c),
HTTPSkip: slices.Contains(httpSkipCodes, c),
Name: c.String(),
Desc: codeDesc(c),
Semerr: fmt.Sprintf("%sError", c),
}
}
if err := generateT.Execute(out, map[string]any{
"infos": infos,
}); err != nil {
return fmt.Errorf("running template %q: %w", generateT.Name(), err)
}
return nil
}
// codeDesc returns the semerr description for c.
// It is a hard API contract.
func codeDesc(c codes.Code) string {
switch c {
case codes.Canceled:
return "canceled"
case codes.Unknown:
return "unknown"
case codes.InvalidArgument:
return "invalid argument"
case codes.DeadlineExceeded:
return "deadline exceeded"
case codes.NotFound:
return "not found"
case codes.AlreadyExists:
return "already exists"
case codes.PermissionDenied:
return "permission denied"
case codes.ResourceExhausted:
return "resource exhausted"
case codes.FailedPrecondition:
return "failed precondition"
case codes.Aborted:
return "aborted"
case codes.OutOfRange:
return "out of range"
case codes.Unimplemented:
return "unimplemented"
case codes.Internal:
return "internal"
case codes.Unavailable:
return "unavailable"
case codes.DataLoss:
return "data loss"
case codes.Unauthenticated:
return "unauthenticated"
default:
panic(fmt.Sprintf("code %s not mapped", c))
}
}
var allCodes = []codes.Code{
// codes.OK is not an error.
codes.Canceled,
codes.Unknown,
codes.InvalidArgument,
codes.DeadlineExceeded,
codes.NotFound,
codes.AlreadyExists,
codes.PermissionDenied,
codes.ResourceExhausted,
codes.FailedPrecondition,
codes.Aborted,
codes.OutOfRange,
codes.Unimplemented,
codes.Internal,
codes.Unavailable,
codes.DataLoss,
codes.Unauthenticated,
}
var httpSkipCodes = []codes.Code{
// Clashes with 400/InvalidArgument:
codes.FailedPrecondition,
codes.OutOfRange,
// Clashes with 409/AlreadyExists:
codes.Aborted,
// Clashes with 500/Internal:
codes.DataLoss,
codes.Unknown,
}