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resolver.go
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resolver.go
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package gbgen
import (
"os"
"path"
"path/filepath"
"strings"
"github.com/rs/zerolog/log"
"github.com/iancoleman/strcase"
"github.com/99designs/gqlgen/codegen"
"github.com/99designs/gqlgen/codegen/config"
"github.com/99designs/gqlgen/codegen/templates"
"github.com/99designs/gqlgen/plugin"
"github.com/pkg/errors"
)
func NewResolverPlugin(output, backend, frontend Config, authImport string) plugin.Plugin {
return &ResolverPlugin{
output: output,
backend: backend,
frontend: frontend,
authImport: authImport,
rootImportPath: getRootImportPath(),
}
}
type ResolverPlugin struct {
output Config
backend Config
frontend Config
authImport string
rootImportPath string
}
var _ plugin.CodeGenerator = &ResolverPlugin{}
func (m *ResolverPlugin) Name() string {
return "resolvergen"
}
func (m *ResolverPlugin) GenerateCode(data *codegen.Data) error {
if !data.Config.Resolver.IsDefined() {
return nil
}
// Get all models information
log.Debug().Msg("[resolver] get boiler models")
boilerModels := GetBoilerModels(m.backend.Directory)
log.Debug().Msg("[resolver] get models with information")
models := GetModelsWithInformation(m.backend, nil, data.Config, boilerModels)
log.Debug().Msg("[resolver] generate file")
switch data.Config.Resolver.Layout {
case config.LayoutSingleFile:
return m.generateSingleFile(data, models, boilerModels)
case config.LayoutFollowSchema:
return m.generatePerSchema(data, models, boilerModels)
}
log.Debug().Msg("[resolver] generated files")
return nil
}
func (m *ResolverPlugin) generateSingleFile(data *codegen.Data, models []*Model, _ []*BoilerModel) error {
file := File{}
file.imports = append(file.imports, Import{
Alias: ".",
ImportPath: path.Join(m.rootImportPath, m.output.Directory),
})
file.imports = append(file.imports, Import{
Alias: "dm",
ImportPath: path.Join(m.rootImportPath, m.backend.Directory),
})
file.imports = append(file.imports, Import{
Alias: "fm",
ImportPath: path.Join(m.rootImportPath, m.frontend.Directory),
})
hasAuth := m.authImport != ""
if hasAuth {
file.imports = append(file.imports, Import{
Alias: "auth",
ImportPath: m.authImport,
})
}
for _, o := range data.Objects {
if o.HasResolvers() {
file.Objects = append(file.Objects, o)
}
for _, f := range o.Fields {
if !f.IsResolver {
continue
}
resolver := &Resolver{
Object: o,
Field: f,
Implementation: `panic("not implemented yet")`,
}
enhanceResolver(resolver, models)
if resolver.Model.BoilerModel != nil && resolver.Model.BoilerModel.Name != "" {
file.Resolvers = append(file.Resolvers, resolver)
} else if resolver.Field.GoFieldName != "Node" {
log.Debug().Str("resolver", resolver.Object.Name).Str("field", resolver.Field.GoFieldName).Msg(
"skipping resolver since no model found")
}
}
}
resolverBuild := &ResolverBuild{
File: &file,
PackageName: data.Config.Resolver.Package,
ResolverType: data.Config.Resolver.Type,
HasRoot: true,
HasAuth: hasAuth,
Models: models,
}
templates.CurrentImports = nil
return templates.Render(templates.Options{
Template: getTemplate("resolver.gotpl"),
PackageName: data.Config.Resolver.Package,
PackageDoc: `// Generated with https://github.com/web-ridge/gqlgen-sqlboiler.`,
Filename: data.Config.Resolver.Filename,
Data: resolverBuild,
Packages: data.Config.Packages,
})
}
//nolint:gocyclo
func (m *ResolverPlugin) generatePerSchema(data *codegen.Data, _ []*Model, _ []*BoilerModel) error {
rewriter, err := NewRewriter(data.Config.Resolver.ImportPath())
if err != nil {
return err
}
files := map[string]*File{}
for _, o := range data.Objects {
if o.HasResolvers() {
fn := gqlToResolverName(data.Config.Resolver.Dir(), o.Position.Src.Name)
if files[fn] == nil {
files[fn] = &File{}
}
rewriter.MarkStructCopied(templates.LcFirst(o.Name) + templates.UcFirst(data.Config.Resolver.Type))
rewriter.GetMethodBody(data.Config.Resolver.Type, o.Name)
files[fn].Objects = append(files[fn].Objects, o)
}
for _, f := range o.Fields {
if !f.IsResolver {
continue
}
structName := templates.LcFirst(o.Name) + templates.UcFirst(data.Config.Resolver.Type)
implementation := strings.TrimSpace(rewriter.GetMethodBody(structName, f.GoFieldName))
// enhanceResolverWithBools(f)
if implementation == "" {
implementation = `panic(fmt.Errorf("not implemented"))`
}
resolver := &Resolver{
Object: o,
Field: f,
Implementation: implementation,
}
fn := gqlToResolverName(data.Config.Resolver.Dir(), f.Position.Src.Name)
if files[fn] == nil {
files[fn] = &File{}
}
files[fn].Resolvers = append(files[fn].Resolvers, resolver)
}
}
for filename, file := range files {
file.imports = rewriter.ExistingImports(filename)
file.RemainingSource = rewriter.RemainingSource(filename)
}
for filename, file := range files {
resolverBuild := &ResolverBuild{
File: file,
PackageName: data.Config.Resolver.Package,
ResolverType: data.Config.Resolver.Type,
}
err := templates.Render(templates.Options{
PackageName: data.Config.Resolver.Package,
PackageDoc: `
// This file will be automatically regenerated based on the schema, any resolver implementations
// will be copied through when generating and any unknown code will be moved to the end.`,
Filename: filename,
Data: resolverBuild,
Packages: data.Config.Packages,
})
if err != nil {
return err
}
}
if _, err := os.Stat(data.Config.Resolver.Filename); os.IsNotExist(errors.Cause(err)) {
err := templates.Render(templates.Options{
PackageName: data.Config.Resolver.Package,
PackageDoc: `
// This file will not be regenerated automatically.
//
// It serves as dependency injection for your app, add any dependencies you require here.`,
Template: `type {{.}} struct {}`,
Filename: data.Config.Resolver.Filename,
Data: data.Config.Resolver.Type,
Packages: data.Config.Packages,
})
if err != nil {
return err
}
}
return nil
}
type ResolverBuild struct {
*File
HasAuth bool
HasRoot bool
PackageName string
ResolverType string
Models []*Model
}
type File struct {
// These are separated because the type definition of the resolver object may live in a different file from the
// resolver method implementations, for example when extending a type in a different graphql schema file
Objects []*codegen.Object
Resolvers []*Resolver
imports []Import
RemainingSource string
}
func (f *File) Imports() string {
for _, imp := range f.imports {
if imp.Alias == "" {
//nolint:errcheck //TODO: handle errors
_, _ = templates.CurrentImports.Reserve(imp.ImportPath)
} else {
//nolint:errcheck //TODO: handle errors
_, _ = templates.CurrentImports.Reserve(imp.ImportPath, imp.Alias)
}
}
return ""
}
type Resolver struct {
Object *codegen.Object
Field *codegen.Field
Implementation string
IsSingle bool
IsList bool
IsCreate bool
IsUpdate bool
IsDelete bool
IsBatchCreate bool
IsBatchUpdate bool
IsBatchDelete bool
BoilerWhiteList string
ResolveOrganizationID bool // TODO: something more pluggable
ResolveUserOrganizationID bool // TODO: something more pluggable
ResolveUserID bool // TODO: something more pluggable
Model Model
InputModel Model
PublicErrorKey string
PublicErrorMessage string
}
func gqlToResolverName(base string, gqlname string) string {
gqlname = filepath.Base(gqlname)
ext := filepath.Ext(gqlname)
return filepath.Join(base, strings.TrimSuffix(gqlname, ext)+".resolvers.go")
}
func enhanceResolver(r *Resolver, models []*Model) { //nolint:gocyclo
nameOfResolver := r.Field.GoFieldName
// get model names + model convert information
modelName, inputModelName := getModelNames(nameOfResolver, false)
// modelPluralName, _ := getModelNames(nameOfResolver, true)
model := findModelOrEmpty(models, modelName)
inputModel := findModelOrEmpty(models, inputModelName)
// save for later inside file
r.Model = model
r.InputModel = inputModel
switch r.Object.Name {
case "Mutation":
r.IsCreate = containsPrefixAndPartAfterThatIsSingle(nameOfResolver, "Create")
r.IsUpdate = containsPrefixAndPartAfterThatIsSingle(nameOfResolver, "Update")
r.IsDelete = containsPrefixAndPartAfterThatIsSingle(nameOfResolver, "Delete")
r.IsBatchCreate = containsPrefixAndPartAfterThatIsPlural(nameOfResolver, "Create")
r.IsBatchUpdate = containsPrefixAndPartAfterThatIsPlural(nameOfResolver, "Update")
r.IsBatchDelete = containsPrefixAndPartAfterThatIsPlural(nameOfResolver, "Delete")
case "Query":
r.IsList = pluralizer.IsPlural(nameOfResolver)
r.IsSingle = !r.IsList
default:
log.Warn().Str("unknown", r.Object.Name).Msg(
"only Query and Mutation are handled we don't recognize the following")
}
lmName := strcase.ToLowerCamel(model.Name)
lmpName := strcase.ToLowerCamel(model.PluralName)
r.PublicErrorKey = "public"
if (r.IsCreate || r.IsDelete || r.IsUpdate) && strings.HasSuffix(lmName, "Batch") {
r.PublicErrorKey += "One"
}
r.PublicErrorKey += model.Name
switch {
case r.IsSingle:
r.PublicErrorKey += "Single"
r.PublicErrorMessage = "could not get " + lmName
case r.IsList:
r.PublicErrorKey += "List"
r.PublicErrorMessage = "could not list " + lmpName
case r.IsCreate:
r.PublicErrorKey += "Create"
r.PublicErrorMessage = "could not create " + lmName
case r.IsUpdate:
r.PublicErrorKey += "Update"
r.PublicErrorMessage = "could not update " + lmName
case r.IsDelete:
r.PublicErrorKey += "Delete"
r.PublicErrorMessage = "could not delete " + lmName
case r.IsBatchCreate:
r.PublicErrorKey += "BatchCreate"
r.PublicErrorMessage = "could not create " + lmpName
case r.IsBatchUpdate:
r.PublicErrorKey += "BatchUpdate"
r.PublicErrorMessage = "could not update " + lmpName
case r.IsBatchDelete:
r.PublicErrorKey += "BatchDelete"
r.PublicErrorMessage = "could not delete " + lmpName
}
r.PublicErrorKey += "Error"
}
func findModelOrEmpty(models []*Model, modelName string) Model {
if modelName == "" {
return Model{}
}
for _, m := range models {
if m.Name == modelName {
return *m
}
}
return Model{}
}
var InputTypes = []string{"Create", "Update", "Delete"} //nolint:gochecknoglobals
func getModelNames(v string, plural bool) (modelName, inputModelName string) {
var prefix string
var isInputType bool
for _, inputType := range InputTypes {
if strings.HasPrefix(v, inputType) {
isInputType = true
v = strings.TrimPrefix(v, inputType)
prefix = inputType
}
}
var s string
if plural {
s = pluralizer.Plural(v)
} else {
s = pluralizer.Singular(v)
}
if isInputType {
return s, s + prefix + "Input"
}
return s, ""
}
func containsPrefixAndPartAfterThatIsSingle(v string, prefix string) bool {
partAfterThat := strings.TrimPrefix(v, prefix)
return strings.HasPrefix(v, prefix) && pluralizer.IsSingular(partAfterThat)
}
func containsPrefixAndPartAfterThatIsPlural(v string, prefix string) bool {
partAfterThat := strings.TrimPrefix(v, prefix)
return strings.HasPrefix(v, prefix) && pluralizer.IsPlural(partAfterThat)
}