forked from 99designs/gqlgen
/
codegen.go
183 lines (156 loc) · 4.83 KB
/
codegen.go
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package codegen
import (
"bytes"
"fmt"
"go/build"
"io/ioutil"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/pkg/errors"
"github.com/vektah/gqlgen/codegen/templates"
"github.com/vektah/gqlgen/neelance/schema"
"golang.org/x/tools/imports"
)
type Config struct {
SchemaStr string
Typemap map[string]string
schema *schema.Schema
ExecFilename string
ExecPackageName string
execPackagePath string
execDir string
ModelFilename string
ModelPackageName string
modelPackagePath string
modelDir string
}
func Generate(cfg Config) error {
if err := cfg.normalize(); err != nil {
return err
}
_ = syscall.Unlink(cfg.ExecFilename)
_ = syscall.Unlink(cfg.ModelFilename)
modelsBuild, err := cfg.models()
if err != nil {
return errors.Wrap(err, "model plan failed")
}
if len(modelsBuild.Models) > 0 {
modelsBuild.PackageName = cfg.ModelPackageName
var buf *bytes.Buffer
buf, err = templates.Run("models.gotpl", modelsBuild)
if err != nil {
return errors.Wrap(err, "model generation failed")
}
if err = write(cfg.ModelFilename, buf.Bytes()); err != nil {
return err
}
for _, model := range modelsBuild.Models {
cfg.Typemap[model.GQLType] = cfg.modelPackagePath + "." + model.GoType
}
for _, enum := range modelsBuild.Enums {
cfg.Typemap[enum.GQLType] = cfg.modelPackagePath + "." + enum.GoType
}
}
build, err := cfg.bind()
if err != nil {
return errors.Wrap(err, "exec plan failed")
}
build.SchemaRaw = cfg.SchemaStr
build.PackageName = cfg.ExecPackageName
var buf *bytes.Buffer
buf, err = templates.Run("generated.gotpl", build)
if err != nil {
return errors.Wrap(err, "exec codegen failed")
}
if err = write(cfg.ExecFilename, buf.Bytes()); err != nil {
return err
}
return nil
}
func (cfg *Config) normalize() error {
if cfg.ModelFilename == "" {
return errors.New("ModelFilename is required")
}
cfg.ModelFilename = abs(cfg.ModelFilename)
cfg.modelDir = filepath.ToSlash(filepath.Dir(cfg.ModelFilename))
if cfg.ModelPackageName == "" {
cfg.ModelPackageName = filepath.Base(cfg.modelDir)
}
cfg.ModelPackageName = sanitizePackageName(cfg.ModelPackageName)
cfg.modelPackagePath = fullPackageName(cfg.modelDir, cfg.ModelPackageName)
if cfg.ExecFilename == "" {
return errors.New("ModelFilename is required")
}
cfg.ExecFilename = abs(cfg.ExecFilename)
cfg.execDir = filepath.ToSlash(filepath.Dir(cfg.ExecFilename))
if cfg.ExecPackageName == "" {
cfg.ExecPackageName = filepath.Base(cfg.execDir)
}
cfg.ExecPackageName = sanitizePackageName(cfg.ExecPackageName)
cfg.execPackagePath = fullPackageName(cfg.execDir, cfg.ExecPackageName)
builtins := map[string]string{
"__Directive": "github.com/vektah/gqlgen/neelance/introspection.Directive",
"__Type": "github.com/vektah/gqlgen/neelance/introspection.Type",
"__Field": "github.com/vektah/gqlgen/neelance/introspection.Field",
"__EnumValue": "github.com/vektah/gqlgen/neelance/introspection.EnumValue",
"__InputValue": "github.com/vektah/gqlgen/neelance/introspection.InputValue",
"__Schema": "github.com/vektah/gqlgen/neelance/introspection.Schema",
"Int": "github.com/vektah/gqlgen/graphql.Int",
"Float": "github.com/vektah/gqlgen/graphql.Float",
"String": "github.com/vektah/gqlgen/graphql.String",
"Boolean": "github.com/vektah/gqlgen/graphql.Boolean",
"ID": "github.com/vektah/gqlgen/graphql.ID",
"Time": "github.com/vektah/gqlgen/graphql.Time",
"Map": "github.com/vektah/gqlgen/graphql.Map",
}
if cfg.Typemap == nil {
cfg.Typemap = map[string]string{}
}
for k, v := range builtins {
if _, ok := cfg.Typemap[k]; !ok {
cfg.Typemap[k] = v
}
}
cfg.schema = schema.New()
return cfg.schema.Parse(cfg.SchemaStr)
}
func abs(path string) string {
absPath, err := filepath.Abs(path)
if err != nil {
panic(err)
}
return filepath.ToSlash(absPath)
}
func fullPackageName(dir string, pkgName string) string {
fullPkgName := filepath.Join(filepath.Dir(dir), pkgName)
for _, gopath := range filepath.SplitList(build.Default.GOPATH) {
gopath = filepath.Join(gopath, "src") + string(os.PathSeparator)
fullPkgName = strings.TrimPrefix(fullPkgName, gopath)
}
return filepath.ToSlash(fullPkgName)
}
func gofmt(filename string, b []byte) ([]byte, error) {
out, err := imports.Process(filename, b, nil)
if err != nil {
return b, errors.Wrap(err, "unable to gofmt")
}
return out, nil
}
func write(filename string, b []byte) error {
err := os.MkdirAll(filepath.Dir(filename), 0755)
if err != nil {
return errors.Wrap(err, "failed to create directory")
}
formatted, err := gofmt(filename, b)
if err != nil {
fmt.Fprintf(os.Stderr, "gofmt failed: %s\n", err.Error())
formatted = b
}
err = ioutil.WriteFile(filename, formatted, 0644)
if err != nil {
return errors.Wrapf(err, "failed to write %s", filename)
}
return nil
}