/
generator.go
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/
generator.go
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// Package clientgo generates client-side Go library
package clientgo
import (
"bytes"
"embed"
"fmt"
"go/format"
"sort"
"strings"
"text/template"
"github.com/go-generalize/api_gen/v2/pkg/parser"
"github.com/go-generalize/api_gen/v2/pkg/util"
"github.com/iancoleman/strcase"
"golang.org/x/xerrors"
)
//go:embed templates/client.go.tmpl
var clientGoTemplate embed.FS
// Generator generates a Go client for api_gen
type Generator interface {
GenerateClient() (string, error)
GenerateTypes(fn func(relPath, code string) error) error
}
var _ Generator = &generator{}
// NewGenerator generates a Go client for api_gen
func NewGenerator(gr *parser.Group, typesDirImportPath, packageName, version string) Generator {
gen := &generator{
PackageName: packageName,
Version: version,
typesDirImportPath: typesDirImportPath,
baseGroup: gr,
}
return gen
}
type endpoint struct {
Name string
Method string
Path string
Request string
Response string
MultipartUpload bool
FileFields []parser.FileField
}
type group struct {
ShortName, Name string
Children []*group
Endpoints []*endpoint
}
type generator struct {
PackageName string
Groups []*group
imports map[string]string
Imports []importPair
Version string
Root *group
MultipartUpload bool
baseGroup *parser.Group
typesDirImportPath string
}
type importPair struct {
Alias, Path string
}
// GenerateClient generates a Go client for api_gen
func (g *generator) GenerateClient() (string, error) {
var err error
g.imports = make(map[string]string)
g.Root, err = g.generateGroup(g.baseGroup)
if err != nil {
return "", xerrors.Errorf("failed to convert groups/endpoints: %w", err)
}
for k, v := range g.imports {
// Overwrite import path to ./classes
path := g.typesDirImportPath + strings.TrimPrefix(k, g.baseGroup.ImportPath)
g.Imports = append(g.Imports, importPair{
Alias: v,
Path: path,
})
}
sort.Slice(g.Imports, func(i, j int) bool {
return g.Imports[i].Path+g.Imports[i].Path < g.Imports[j].Path+g.Imports[j].Path
})
tmpl, err := template.New("client.go.tmpl").Funcs(
template.FuncMap{
"IsArrayMultipleUpload": func(f parser.FileField) bool {
return f.Type == parser.UploadMultipleFiles
},
},
).ParseFS(clientGoTemplate, "templates/client.go.tmpl")
if err != nil {
return "", err
}
buf := bytes.NewBuffer(nil)
if err := tmpl.ExecuteTemplate(buf, "client.go.tmpl", g); err != nil {
return "", err
}
formatted, err := format.Source(buf.Bytes())
if err != nil {
return "", err
}
return string(formatted), nil
}
func (g *generator) generateEndpoint(ep *parser.Endpoint) (*endpoint, error) {
gen := &endpoint{}
gen.Method = string(ep.Method)
fullPath := ep.GetFullPath("/", func(rawPath, path, placeholder string) string {
if placeholder != "" {
return fmt.Sprintf(
`" + fmt.Sprint(reqPayload.%s) + "`,
util.FindStructField(ep.RequestGo2tsPayload, parser.QueryParamTag, placeholder),
)
}
return path
})
if ep.UseMultipartUpload {
g.MultipartUpload = true
gen.MultipartUpload = true
fields, err := parser.GetFileFields(ep.RequestGo2tsPayload)
if err != nil {
return nil, xerrors.Errorf("failed to get file fields: %w", err)
}
gen.FileFields = fields
}
fullPath = `"` + fullPath + `"`
gen.Path = fullPath
gen.Name = strcase.ToCamel(strings.ToLower(string(ep.Method))) + ep.RawPath
importAlias := g.imports[ep.GetParent().ImportPath]
gen.Request = fmt.Sprintf("%s.%s", importAlias, ep.RequestPayloadName)
gen.Response = fmt.Sprintf("%s.%s", importAlias, ep.ResponsePayloadName)
return gen, nil
}
func (g *generator) generateGroup(gr *parser.Group) (*group, error) {
gen := &group{}
p := gr.GetFullPath("_", func(rawPath, path, placeholder string) string {
return rawPath
})
gen.ShortName = strcase.ToCamel(gr.RawPath)
gen.Name = "Group" + p
if len(gr.Endpoints) != 0 {
importAlias := gr.GetFullPath("_", func(rawPath, path, placeholder string) string {
return rawPath
})
if importAlias == "" {
importAlias = "root"
}
g.imports[gr.ImportPath] = importAlias
}
gen.Children = make([]*group, 0, len(gr.Children))
for i := range gr.Children {
gr, err := g.generateGroup(gr.Children[i])
if err != nil {
return nil, xerrors.Errorf("failed to generate group(%s): %w", gr.Children[i].Name, err)
}
gen.Children = append(gen.Children, gr)
}
gen.Endpoints = make([]*endpoint, 0, len(gr.Endpoints))
for i := range gr.Endpoints {
ep, err := g.generateEndpoint(gr.Endpoints[i])
if err != nil {
return nil, xerrors.Errorf("failed to generate endpoint(%s): %w", gr.Endpoints[i].RawPath, err)
}
gen.Endpoints = append(gen.Endpoints, ep)
}
g.Groups = append(g.Groups, gen)
return gen, nil
}