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Extract model generation into a plugin
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Adam Scarr
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Jan 21, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "go/types" | ||
| "regexp" | ||
| "strings" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "golang.org/x/tools/go/loader" | ||
| ) | ||
|
|
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| // Binder connects graphql types to golang types using static analysis | ||
| type Binder struct { | ||
| program *loader.Program | ||
| types TypeMap | ||
| } | ||
|
|
||
| func (c *Config) NewBinder() (*Binder, error) { | ||
| conf := loader.Config{ | ||
| AllowErrors: true, | ||
| TypeChecker: types.Config{ | ||
| Error: func(e error) {}, | ||
| }, | ||
| } | ||
|
|
||
| for _, pkg := range c.Models.ReferencedPackages() { | ||
| conf.Import(pkg) | ||
| } | ||
|
|
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| prog, err := conf.Load() | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "loading program") | ||
| } | ||
|
|
||
| return &Binder{ | ||
| program: prog, | ||
| types: c.Models, | ||
| }, nil | ||
| } | ||
|
|
||
| func (b *Binder) FindType(pkgName string, typeName string) (types.Type, error) { | ||
| obj, err := b.FindObject(pkgName, typeName) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if fun, isFunc := obj.(*types.Func); isFunc { | ||
| return fun.Type().(*types.Signature).Params().At(0).Type(), nil | ||
| } | ||
| return obj.Type(), nil | ||
| } | ||
|
|
||
| func (b *Binder) getPkg(find string) *loader.PackageInfo { | ||
| for n, p := range b.program.Imported { | ||
| if normalizeVendor(find) == normalizeVendor(n) { | ||
| return p | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (b *Binder) FindObject(pkgName string, typeName string) (types.Object, error) { | ||
| if pkgName == "" { | ||
| return nil, fmt.Errorf("package cannot be nil") | ||
| } | ||
| fullName := typeName | ||
| if pkgName != "" { | ||
| fullName = pkgName + "." + typeName | ||
| } | ||
|
|
||
| pkg := b.getPkg(pkgName) | ||
| if pkg == nil { | ||
| return nil, errors.Errorf("required package was not loaded: %s", fullName) | ||
| } | ||
|
|
||
| for astNode, def := range pkg.Defs { | ||
| // only look at defs in the top scope | ||
| if def == nil || def.Parent() == nil || def.Parent() != pkg.Pkg.Scope() { | ||
| continue | ||
| } | ||
|
|
||
| if astNode.Name == typeName || astNode.Name == "Marshal"+typeName { | ||
| return def, nil | ||
| } | ||
| } | ||
|
|
||
| return nil, errors.Errorf("unable to find type %s\n", fullName) | ||
| } | ||
|
|
||
| var modsRegex = regexp.MustCompile(`^(\*|\[\])*`) | ||
|
|
||
| func normalizeVendor(pkg string) string { | ||
| modifiers := modsRegex.FindAllString(pkg, 1)[0] | ||
| pkg = strings.TrimPrefix(pkg, modifiers) | ||
| parts := strings.Split(pkg, "/vendor/") | ||
| return modifiers + parts[len(parts)-1] | ||
| } |
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