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renderer.go
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renderer.go
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package render
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"os"
"path"
"strings"
"text/template"
"github.com/beevik/etree"
"github.com/huangjunwen/sqlw-mysql/datasrc"
"github.com/huangjunwen/sqlw-mysql/infos"
)
// Renderer is used to render templates to final source code.
type Renderer struct {
// Options.
dsn string
stmtDir string
tmplDir http.FileSystem
outputDir string
outputPkg string
whitelist map[string]struct{}
blacklist map[string]struct{}
// Runtime vars.
loader *datasrc.Loader
db *infos.DBInfo
manifest *Manifest
}
// Option is used to create Renderer.
type Option func(*Renderer) error
// DSN sets the data source name. (required)
func DSN(dsn string) Option {
return func(r *Renderer) error {
r.dsn = dsn
return nil
}
}
// StmtDir sets the statement xml directory.
func StmtDir(stmtDir string) Option {
return func(r *Renderer) error {
stmtDir = path.Clean(stmtDir)
fi, err := os.Stat(stmtDir)
if err != nil {
return err
}
if !fi.IsDir() {
return fmt.Errorf("%+q is not a directory.", stmtDir)
}
r.stmtDir = stmtDir
return nil
}
}
// TmplDir sets the template directory. (required)
func TmplDir(tmplDir http.FileSystem) Option {
return func(r *Renderer) error {
r.tmplDir = tmplDir
return nil
}
}
// OutputDir sets the output directory. It will mkdir if not exists. (required)
func OutputDir(outputDir string) Option {
return func(r *Renderer) error {
if outputDir == "" {
return fmt.Errorf("Output directory is empty.")
}
outputDir = path.Clean(outputDir)
if outputDir == "/" {
return fmt.Errorf("Output directory can't be root '/'")
}
if err := os.MkdirAll(outputDir, 0755); err != nil {
return err
}
r.outputDir = outputDir
return nil
}
}
// OutputPkg sets an alternative package name for the generated code. By default the output directory is used.
func OutputPkg(outputPkg string) Option {
return func(r *Renderer) error {
r.outputPkg = outputPkg
return nil
}
}
// Whitelist sets the whitelist of table names to render.
func Whitelist(whitelist []string) Option {
return func(r *Renderer) error {
if len(r.blacklist) != 0 {
return fmt.Errorf("Can't set whitelist since blacklist is set")
}
r.whitelist = make(map[string]struct{})
for _, item := range whitelist {
r.whitelist[item] = struct{}{}
}
return nil
}
}
// Blacklist sets the blacklist of table names to render.
func Blacklist(blacklist []string) Option {
return func(r *Renderer) error {
if len(r.whitelist) != 0 {
return fmt.Errorf("Can't set blacklist since whitelist is set")
}
r.blacklist = make(map[string]struct{})
for _, item := range blacklist {
r.blacklist[item] = struct{}{}
}
return nil
}
}
// NewRenderer creates a new Renderer.
func NewRenderer(opts ...Option) (*Renderer, error) {
r := &Renderer{}
for _, opt := range opts {
if err := opt(r); err != nil {
return nil, err
}
}
if r.dsn == "" {
return nil, fmt.Errorf("Missing DSN")
}
if r.tmplDir == nil {
return nil, fmt.Errorf("Missing TmplDir")
}
if r.outputDir == "" {
return nil, fmt.Errorf("Missing OutputDir")
}
if r.outputPkg == "" {
r.outputPkg = path.Base(r.outputDir)
}
return r, nil
}
// Run the render process.
func (r *Renderer) Run() error {
r.loader = nil
r.db = nil
r.manifest = nil
// Create loader.
var err error
r.loader, err = datasrc.NewLoader(r.dsn)
if err != nil {
return err
}
defer r.loader.Close()
// Load db.
r.db, err = infos.NewDBInfo(r.loader)
if err != nil {
return err
}
// Load manifest.
r.manifest, err = LoadManifest(r.tmplDir, r.funcMap())
if err != nil {
return err
}
// Render per run templates.
for _, tmpls := range r.manifest.PerRun {
if err := r.render(tmpls, map[string]interface{}{
"PackageName": r.outputPkg,
"DB": r.db,
}); err != nil {
return err
}
}
// Render per table templates.
for _, table := range r.db.Tables() {
// Filter table.
if len(r.whitelist) != 0 {
if _, found := r.whitelist[table.TableName()]; !found {
continue
}
} else if len(r.blacklist) != 0 {
if _, found := r.blacklist[table.TableName()]; found {
continue
}
}
// Render.
for _, tmpls := range r.manifest.PerTable {
if err := r.render(tmpls, map[string]interface{}{
"PackageName": r.outputPkg,
"DB": r.db,
"Table": table,
}); err != nil {
return err
}
}
}
if r.stmtDir == "" {
return nil
}
// Render per stmt xml templates.
stmtFileInfos, err := ioutil.ReadDir(r.stmtDir)
if err != nil {
return err
}
for _, stmtFileInfo := range stmtFileInfos {
// Skip directory and non xml files.
if stmtFileInfo.IsDir() {
continue
}
stmtFileName := stmtFileInfo.Name()
if !strings.HasSuffix(stmtFileName, ".xml") {
continue
}
// Load xml.
doc := etree.NewDocument()
if err := doc.ReadFromFile(path.Join(r.stmtDir, stmtFileName)); err != nil {
return err
}
// Xml -> StmtInfo.
stmtInfos := []*infos.StmtInfo{}
for _, elem := range doc.ChildElements() {
stmtInfo, err := infos.NewStmtInfo(r.loader, r.db, elem)
if err != nil {
return err
}
stmtInfos = append(stmtInfos, stmtInfo)
}
// Render.
for _, tmpls := range r.manifest.PerStmtXML {
if err := r.render(tmpls, map[string]interface{}{
"PackageName": r.outputPkg,
"DB": r.db,
"Stmts": stmtInfos,
"StmtXMLName": strings.TrimSuffix(stmtFileName, ".xml"),
}); err != nil {
return err
}
}
}
return nil
}
func (r *Renderer) render(tmpls [2]*template.Template, data interface{}) error {
nameTmpl, contentTmpl := tmpls[0], tmpls[1]
nameBuf := bytes.Buffer{}
contentBuf := bytes.Buffer{}
// Render file name.
if err := nameTmpl.Execute(&nameBuf, data); err != nil {
return err
}
// Render file content.
if err := contentTmpl.Execute(&contentBuf, data); err != nil {
return err
}
// Open file to write.
f, err := os.OpenFile(path.Join(r.outputDir, string(nameBuf.Bytes())), os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644)
if err != nil {
return err
}
defer f.Close()
// Write.
_, err = f.Write(contentBuf.Bytes())
if err != nil {
return err
}
return nil
}