forked from goadesign/goa
/
generator.go
512 lines (482 loc) · 13.6 KB
/
generator.go
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package genapp
import (
"flag"
"fmt"
"os"
"path/filepath"
"sort"
"github.com/goadesign/goa/design"
"github.com/goadesign/goa/goagen/codegen"
"github.com/goadesign/goa/goagen/utils"
)
//NewGenerator returns an initialized instance of an Application Generator
func NewGenerator(options ...Option) *Generator {
g := &Generator{}
g.validator = codegen.NewValidator()
for _, option := range options {
option(g)
}
return g
}
// Generator is the application code generator.
type Generator struct {
API *design.APIDefinition // The API definition
OutDir string // Path to output directory
Target string // Name of generated package
NoTest bool // Whether to skip test generation
genfiles []string // Generated files
validator *codegen.Validator // Validation code generator
}
// Generate is the generator entry point called by the meta generator.
func Generate() (files []string, err error) {
var (
outDir, toolDir, target, ver string
notest, notool, regen bool
)
set := flag.NewFlagSet("app", flag.PanicOnError)
set.String("design", "", "")
set.StringVar(&outDir, "out", "", "")
set.StringVar(&target, "pkg", "app", "")
set.StringVar(&ver, "version", "", "")
set.StringVar(&toolDir, "tooldir", "tool", "")
set.BoolVar(¬est, "notest", false, "")
set.BoolVar(¬ool, "notool", false, "")
set.BoolVar(®en, "regen", false, "")
set.Bool("force", false, "")
set.Parse(os.Args[1:])
outDir = filepath.Join(outDir, target)
if err := codegen.CheckVersion(ver); err != nil {
return nil, err
}
target = codegen.Goify(target, false)
g := &Generator{OutDir: outDir, Target: target, NoTest: notest, API: design.Design, validator: codegen.NewValidator()}
return g.Generate()
}
// Generate the application code, implement codegen.Generator.
func (g *Generator) Generate() (_ []string, err error) {
if g.API == nil {
return nil, fmt.Errorf("missing API definition, make sure design is properly initialized")
}
go utils.Catch(nil, func() { g.Cleanup() })
defer func() {
if err != nil {
g.Cleanup()
}
}()
codegen.Reserved[g.Target] = true
os.RemoveAll(g.OutDir)
if err := os.MkdirAll(g.OutDir, 0755); err != nil {
return nil, err
}
g.genfiles = []string{g.OutDir}
if err := g.generateContexts(); err != nil {
return nil, err
}
if err := g.generateControllers(); err != nil {
return nil, err
}
if err := g.generateSecurity(); err != nil {
return nil, err
}
if err := g.generateHrefs(); err != nil {
return nil, err
}
if err := g.generateMediaTypes(); err != nil {
return nil, err
}
if err := g.generateUserTypes(); err != nil {
return nil, err
}
if !g.NoTest {
if err := g.generateResourceTest(); err != nil {
return nil, err
}
}
return g.genfiles, nil
}
// Cleanup removes the entire "app" directory if it was created by this generator.
func (g *Generator) Cleanup() {
if len(g.genfiles) == 0 {
return
}
os.RemoveAll(g.OutDir)
g.genfiles = nil
}
// generateContexts iterates through the API resources and actions and generates the action
// contexts.
func (g *Generator) generateContexts() (err error) {
var (
ctxFile string
ctxWr *ContextsWriter
)
{
ctxFile = filepath.Join(g.OutDir, "contexts.go")
ctxWr, err = NewContextsWriter(ctxFile)
if err != nil {
return
}
}
defer func() {
ctxWr.Close()
if err == nil {
err = ctxWr.FormatCode()
}
}()
title := fmt.Sprintf("%s: Application Contexts", g.API.Context())
imports := []*codegen.ImportSpec{
codegen.SimpleImport("fmt"),
codegen.SimpleImport("net/http"),
codegen.SimpleImport("strconv"),
codegen.SimpleImport("strings"),
codegen.SimpleImport("time"),
codegen.SimpleImport("unicode/utf8"),
codegen.SimpleImport("github.com/goadesign/goa"),
codegen.NewImport("uuid", "github.com/satori/go.uuid"),
codegen.SimpleImport("context"),
}
g.API.IterateResources(func(r *design.ResourceDefinition) error {
return r.IterateActions(func(a *design.ActionDefinition) error {
if a.Payload != nil {
imports = codegen.AttributeImports(a.Payload.AttributeDefinition, imports, nil)
}
return nil
})
})
g.genfiles = append(g.genfiles, ctxFile)
if err = ctxWr.WriteHeader(title, g.Target, imports); err != nil {
return
}
err = g.API.IterateResources(func(r *design.ResourceDefinition) error {
return r.IterateActions(func(a *design.ActionDefinition) error {
ctxName := codegen.Goify(a.Name, true) + codegen.Goify(a.Parent.Name, true) + "Context"
headers := &design.AttributeDefinition{
Type: design.Object{},
}
if r.Headers != nil {
headers.Merge(r.Headers)
headers.Validation = r.Headers.Validation
}
if a.Headers != nil {
headers.Merge(a.Headers)
headers.Validation = a.Headers.Validation
}
if headers != nil && len(headers.Type.ToObject()) == 0 {
headers = nil // So that {{if .Headers}} returns false in templates
}
params := a.AllParams()
if params != nil && len(params.Type.ToObject()) == 0 {
params = nil // So that {{if .Params}} returns false in templates
}
non101 := make(map[string]*design.ResponseDefinition)
for k, v := range a.Responses {
if v.Status != 101 {
non101[k] = v
}
}
ctxData := ContextTemplateData{
Name: ctxName,
ResourceName: r.Name,
ActionName: a.Name,
Payload: a.Payload,
Params: params,
Headers: headers,
Routes: a.Routes,
Responses: non101,
API: g.API,
DefaultPkg: g.Target,
Security: a.Security,
}
return ctxWr.Execute(&ctxData)
})
})
return
}
// generateControllers iterates through the API resources and generates the low level
// controllers.
func (g *Generator) generateControllers() (err error) {
var (
ctlFile string
ctlWr *ControllersWriter
)
{
ctlFile = filepath.Join(g.OutDir, "controllers.go")
ctlWr, err = NewControllersWriter(ctlFile)
if err != nil {
return
}
}
defer func() {
ctlWr.Close()
if err == nil {
err = ctlWr.FormatCode()
}
}()
title := fmt.Sprintf("%s: Application Controllers", g.API.Context())
imports := []*codegen.ImportSpec{
codegen.SimpleImport("net/http"),
codegen.SimpleImport("fmt"),
codegen.SimpleImport("context"),
codegen.SimpleImport("github.com/goadesign/goa"),
codegen.SimpleImport("github.com/goadesign/goa/cors"),
codegen.SimpleImport("regexp"),
codegen.SimpleImport("strconv"),
codegen.SimpleImport("time"),
codegen.NewImport("uuid", "github.com/satori/go.uuid"),
}
encoders, err := BuildEncoders(g.API.Produces, true)
if err != nil {
return err
}
decoders, err := BuildEncoders(g.API.Consumes, false)
if err != nil {
return err
}
encoderImports := make(map[string]bool)
for _, data := range encoders {
encoderImports[data.PackagePath] = true
}
for _, data := range decoders {
encoderImports[data.PackagePath] = true
}
var packagePaths []string
for packagePath := range encoderImports {
if packagePath != "github.com/goadesign/goa" {
packagePaths = append(packagePaths, packagePath)
}
}
sort.Strings(packagePaths)
for _, packagePath := range packagePaths {
imports = append(imports, codegen.SimpleImport(packagePath))
}
if err = ctlWr.WriteHeader(title, g.Target, imports); err != nil {
return err
}
if err = ctlWr.WriteInitService(encoders, decoders); err != nil {
return err
}
g.genfiles = append(g.genfiles, ctlFile)
var controllersData []*ControllerTemplateData
g.API.IterateResources(func(r *design.ResourceDefinition) error {
// Create file servers for all directory file servers that serve index.html.
fileServers := r.FileServers
for _, fs := range r.FileServers {
if fs.IsDir() {
rpath := design.WildcardRegex.ReplaceAllLiteralString(fs.RequestPath, "")
rpath += "/"
fileServers = append(fileServers, &design.FileServerDefinition{
Parent: fs.Parent,
Description: fs.Description,
Docs: fs.Docs,
FilePath: filepath.Join(fs.FilePath, "index.html"),
RequestPath: rpath,
Metadata: fs.Metadata,
Security: fs.Security,
})
}
}
data := &ControllerTemplateData{
API: g.API,
Resource: codegen.Goify(r.Name, true),
PreflightPaths: r.PreflightPaths(),
FileServers: fileServers,
}
r.IterateActions(func(a *design.ActionDefinition) error {
context := fmt.Sprintf("%s%sContext", codegen.Goify(a.Name, true), codegen.Goify(r.Name, true))
unmarshal := fmt.Sprintf("unmarshal%s%sPayload", codegen.Goify(a.Name, true), codegen.Goify(r.Name, true))
action := map[string]interface{}{
"Name": codegen.Goify(a.Name, true),
"DesignName": a.Name,
"Routes": a.Routes,
"Context": context,
"Unmarshal": unmarshal,
"Payload": a.Payload,
"PayloadOptional": a.PayloadOptional,
"PayloadMultipart": a.PayloadMultipart,
"Security": a.Security,
}
data.Actions = append(data.Actions, action)
return nil
})
if len(data.Actions) > 0 || len(data.FileServers) > 0 {
data.Encoders = encoders
data.Decoders = decoders
data.Origins = r.AllOrigins()
controllersData = append(controllersData, data)
}
return nil
})
err = ctlWr.Execute(controllersData)
return
}
// generateControllers iterates through the API resources and generates the low level
// controllers.
func (g *Generator) generateSecurity() (err error) {
if len(g.API.SecuritySchemes) == 0 {
return nil
}
var (
secFile string
secWr *SecurityWriter
)
{
secFile = filepath.Join(g.OutDir, "security.go")
secWr, err = NewSecurityWriter(secFile)
if err != nil {
return
}
}
defer func() {
secWr.Close()
if err == nil {
err = secWr.FormatCode()
}
}()
title := fmt.Sprintf("%s: Application Security", g.API.Context())
imports := []*codegen.ImportSpec{
codegen.SimpleImport("net/http"),
codegen.SimpleImport("errors"),
codegen.SimpleImport("context"),
codegen.SimpleImport("github.com/goadesign/goa"),
}
if err = secWr.WriteHeader(title, g.Target, imports); err != nil {
return err
}
g.genfiles = append(g.genfiles, secFile)
err = secWr.Execute(design.Design.SecuritySchemes)
return
}
// generateHrefs iterates through the API resources and generates the href factory methods.
func (g *Generator) generateHrefs() (err error) {
var (
hrefFile string
resWr *ResourcesWriter
)
{
hrefFile = filepath.Join(g.OutDir, "hrefs.go")
resWr, err = NewResourcesWriter(hrefFile)
if err != nil {
return
}
}
defer func() {
resWr.Close()
if err == nil {
err = resWr.FormatCode()
}
}()
title := fmt.Sprintf("%s: Application Resource Href Factories", g.API.Context())
imports := []*codegen.ImportSpec{
codegen.SimpleImport("fmt"),
codegen.SimpleImport("strings"),
}
if err = resWr.WriteHeader(title, g.Target, imports); err != nil {
return err
}
g.genfiles = append(g.genfiles, hrefFile)
err = g.API.IterateResources(func(r *design.ResourceDefinition) error {
m := g.API.MediaTypeWithIdentifier(r.MediaType)
var identifier string
if m != nil {
identifier = m.Identifier
} else {
identifier = "text/plain"
}
data := ResourceData{
Name: codegen.Goify(r.Name, true),
Identifier: identifier,
Description: r.Description,
Type: m,
CanonicalTemplate: codegen.CanonicalTemplate(r),
CanonicalParams: codegen.CanonicalParams(r),
}
return resWr.Execute(&data)
})
return
}
// generateMediaTypes iterates through the media types and generate the data structures and
// marshaling code.
func (g *Generator) generateMediaTypes() (err error) {
var (
mtFile string
mtWr *MediaTypesWriter
)
{
mtFile = filepath.Join(g.OutDir, "media_types.go")
mtWr, err = NewMediaTypesWriter(mtFile)
if err != nil {
return
}
}
defer func() {
mtWr.Close()
if err == nil {
err = mtWr.FormatCode()
}
}()
title := fmt.Sprintf("%s: Application Media Types", g.API.Context())
imports := []*codegen.ImportSpec{
codegen.SimpleImport("github.com/goadesign/goa"),
codegen.SimpleImport("fmt"),
codegen.SimpleImport("time"),
codegen.SimpleImport("unicode/utf8"),
codegen.NewImport("uuid", "github.com/satori/go.uuid"),
}
for _, v := range g.API.MediaTypes {
imports = codegen.AttributeImports(v.AttributeDefinition, imports, nil)
}
if err = mtWr.WriteHeader(title, g.Target, imports); err != nil {
return err
}
g.genfiles = append(g.genfiles, mtFile)
err = g.API.IterateMediaTypes(func(mt *design.MediaTypeDefinition) error {
if mt.IsError() {
return nil
}
if mt.Type.IsObject() || mt.Type.IsArray() {
return mtWr.Execute(mt)
}
return nil
})
return
}
// generateUserTypes iterates through the user types and generates the data structures and
// marshaling code.
func (g *Generator) generateUserTypes() (err error) {
var (
utFile string
utWr *UserTypesWriter
)
{
utFile = filepath.Join(g.OutDir, "user_types.go")
utWr, err = NewUserTypesWriter(utFile)
if err != nil {
return
}
}
defer func() {
utWr.Close()
if err == nil {
err = utWr.FormatCode()
}
}()
title := fmt.Sprintf("%s: Application User Types", g.API.Context())
imports := []*codegen.ImportSpec{
codegen.SimpleImport("fmt"),
codegen.SimpleImport("mime/multipart"),
codegen.SimpleImport("time"),
codegen.SimpleImport("unicode/utf8"),
codegen.SimpleImport("github.com/goadesign/goa"),
codegen.NewImport("uuid", "github.com/satori/go.uuid"),
}
for _, v := range g.API.Types {
imports = codegen.AttributeImports(v.AttributeDefinition, imports, nil)
}
if err = utWr.WriteHeader(title, g.Target, imports); err != nil {
return err
}
g.genfiles = append(g.genfiles, utFile)
err = g.API.IterateUserTypes(func(t *design.UserTypeDefinition) error {
return utWr.Execute(t)
})
return
}