forked from gnormal/gnorm
/
generate.go
319 lines (303 loc) · 8.8 KB
/
generate.go
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package run // import "gnorm.org/gnorm/run"
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"text/template"
"time"
"github.com/pkg/errors"
"gnorm.org/gnorm/environ"
"gnorm.org/gnorm/run/data"
)
// Generate reads your database, gets the schema for it, and then generates
// files based on your templates and your configuration.
func Generate(env environ.Values, cfg *Config) error {
info, err := cfg.Driver.Parse(env.Log, cfg.ConnStr, cfg.Schemas, makeFilter(cfg.IncludeTables, cfg.ExcludeTables))
if err != nil {
return err
}
db, err := makeData(env.Log, info, cfg)
if err != nil {
return err
}
if len(cfg.SchemaPaths) == 0 {
env.Log.Println("No SchemaPaths specified, skipping schemas.")
} else {
if err := generateSchemas(env, cfg, db); err != nil {
return err
}
}
if len(cfg.EnumPaths) == 0 {
env.Log.Println("No EnumPath specified, skipping enums.")
} else {
if err := generateEnums(env, cfg, db); err != nil {
return err
}
}
if len(cfg.TablePaths) == 0 {
env.Log.Println("No table path specified, skipping tables.")
} else {
if err := generateTables(env, cfg, db); err != nil {
return err
}
}
return copyStaticFiles(env, cfg.StaticDir, cfg.OutputDir)
}
func generateSchemas(env environ.Values, cfg *Config, db *data.DBData) error {
for _, schema := range db.Schemas {
fileData := struct{ Schema string }{Schema: schema.Name}
contents := data.SchemaData{
Schema: schema,
DB: db,
Config: cfg.ConfigData,
Params: cfg.Params,
}
for _, target := range cfg.SchemaPaths {
env.Log.Printf("Generating output for schema %v", schema.Name)
if err := genFile(env, fileData, contents, target, cfg.NoOverwriteGlobs, cfg.PostRun, cfg.OutputDir, cfg.TemplateEngine); err != nil {
return errors.WithMessage(err, "generating file for schema "+schema.Name)
}
}
}
return nil
}
type templateEngine struct {
CommandLine []*template.Template
UseStdin bool
UseStdout bool
}
func generateEnums(env environ.Values, cfg *Config, db *data.DBData) error {
for _, schema := range db.Schemas {
for _, enum := range schema.Enums {
fileData := struct{ Schema, Enum, Table string }{Schema: schema.Name, Enum: enum.Name, Table: enum.Table.DBName}
contents := data.EnumData{
Enum: enum,
DB: db,
Config: cfg.ConfigData,
Params: cfg.Params,
}
for _, target := range cfg.EnumPaths {
if err := genFile(env, fileData, contents, target, cfg.NoOverwriteGlobs, cfg.PostRun, cfg.OutputDir, cfg.TemplateEngine); err != nil {
env.Log.Printf("Generating output for enum %v", enum.Name)
return errors.WithMessage(err, "generating file for enum "+enum.Name)
}
}
}
}
return nil
}
func generateTables(env environ.Values, cfg *Config, db *data.DBData) error {
for _, schema := range db.Schemas {
for _, table := range schema.Tables {
contents := data.TableData{
Table: table,
DB: db,
Config: cfg.ConfigData,
Params: cfg.Params,
}
fileData := struct{ Schema, Table string }{Schema: schema.Name, Table: table.Name}
for _, target := range cfg.TablePaths {
if err := genFile(env, fileData, contents, target, cfg.NoOverwriteGlobs, cfg.PostRun, cfg.OutputDir, cfg.TemplateEngine); err != nil {
env.Log.Printf("Generating output for table %v", table.Name)
return errors.WithMessage(err, "generating file for table "+table.Name)
}
}
}
}
return nil
}
func genFile(env environ.Values, filedata, contents interface{}, target OutputTarget, noOverwriteGlobs, postrun []string, outputDir string, engine templateEngine) error {
buf := &bytes.Buffer{}
err := target.Filename.Execute(buf, filedata)
if err != nil {
return errors.WithMessage(err, "failed to run Filename template")
}
outputPath := filepath.Join(outputDir, buf.String())
// if file exists and filename matches glob, abort
if _, err := os.Stat(outputPath); err == nil {
for _, glob := range noOverwriteGlobs {
m, err := filepath.Match(glob, buf.String())
if err != nil {
return errors.WithMessage(err, "error checking glob")
}
if m {
env.Log.Printf("Skipping generation for file %s", buf.String())
return nil
}
}
}
if err := os.MkdirAll(filepath.Dir(outputPath), 0700); err != nil {
return errors.WithMessage(err, "error creating template output directory")
}
if len(engine.CommandLine) != 0 {
if err := runExternalEngine(env.Env, outputPath, target.ContentsPath, contents, engine); err != nil {
return err
}
} else {
outbuf := &bytes.Buffer{}
if err := target.Contents.Execute(outbuf, contents); err != nil {
return errors.WithMessage(err, "failed to run contents template")
}
if err := ioutil.WriteFile(outputPath, outbuf.Bytes(), 0600); err != nil {
return errors.Wrapf(err, "error writing generated file %q", outputPath)
}
}
if len(postrun) > 0 {
return doPostRun(env, outputPath, postrun)
}
return nil
}
func runExternalEngine(env map[string]string, outputPath, templatePath string, contents interface{}, engine templateEngine) error {
b, err := json.Marshal(contents)
if err != nil {
return errors.WithMessage(err, "can't render data for template to json")
}
var jsonDataFile string
if !engine.UseStdin {
f, err := ioutil.TempFile("", "*.json")
if err != nil {
return errors.WithMessage(err, "can't create temp file with json")
}
defer f.Close()
jsonDataFile = f.Name()
if _, err = f.Write(b); err != nil {
return errors.WithMessage(err, "failed to write json to file "+jsonDataFile)
}
f.Close()
defer os.Remove(jsonDataFile)
}
data := map[string]string{
"Data": jsonDataFile,
"Output": outputPath,
"Template": templatePath,
}
var args []string
for _, t := range engine.CommandLine {
var buf bytes.Buffer
if err := t.Execute(&buf, data); err != nil {
return errors.WithMessage(err, "failed to run fill template engine command line variables")
}
args = append(args, buf.String())
}
cmd := exec.Command(args[0], args[1:]...)
if engine.UseStdin {
cmd.Stdin = bytes.NewReader(b)
}
var stderr bytes.Buffer
var stdout bytes.Buffer
cmd.Stderr = &stderr
if engine.UseStdout {
cmd.Stdout = &stdout
}
envvars := make([]string, 0, len(env))
for k, v := range env {
envvars = append(envvars, k+"="+v)
}
cmd.Env = envvars
if err := cmd.Run(); err != nil {
cl := strings.Join(args, " ")
if stderr.Len() > 0 {
return errors.WithMessage(err, fmt.Sprintf("failed to run template engine command line %q\n%s", cl, stderr.String()))
}
return errors.WithMessage(err, "failed to run template engine command line: "+cl)
}
if engine.UseStdout {
if err := ioutil.WriteFile(outputPath, stdout.Bytes(), 0600); err != nil {
return errors.WithMessage(err, "failed to write output file "+outputPath)
}
}
return nil
}
func doPostRun(env environ.Values, file string, postrun []string) error {
newenv := make(map[string]string, len(env.Env)+1)
for k := range env.Env {
newenv[k] = env.Env[k]
}
run := make([]string, len(postrun))
newenv["GNORMFILE"] = file
conv := func(s string) string { return newenv[s] }
for x, s := range postrun {
run[x] = os.Expand(s, conv)
}
var cmd *exec.Cmd
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
if len(run) > 1 {
cmd = exec.CommandContext(ctx, run[0], run[1:]...)
} else {
cmd = exec.CommandContext(ctx, run[0])
}
cmd.Stderr = env.Stderr
cmd.Stdout = env.Stdout
if err := cmd.Run(); err != nil {
return errors.Wrapf(err, "error running postrun command %q", run)
}
return nil
}
// copyStaticFiles copies files recursively from src directory to dest directory
// while preserving the directory structure
func copyStaticFiles(env environ.Values, src string, dest string) error {
if src == "" || dest == "" {
return nil
}
stat, err := os.Stat(src)
if err != nil {
return err
}
if !stat.IsDir() {
return fmt.Errorf("Outputdir specifies a directory path that already exists as file %s", dest)
}
var dstat os.FileInfo
dstat, err = os.Stat(dest)
if err != nil {
if os.IsNotExist(err) {
err = os.MkdirAll(dest, stat.Mode())
if err != nil {
return err
}
dstat = stat
} else {
return err
}
}
if !dstat.IsDir() {
return fmt.Errorf("%s is not a directory", dest)
}
return filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
base := filepath.Dir(path)
rel, err := filepath.Rel(src, base)
if err != nil {
return err
}
o := filepath.Join(dest, rel)
err = os.MkdirAll(o, stat.Mode())
if err != nil {
return err
}
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
t, err := os.OpenFile(filepath.Join(o, filepath.Base(path)), os.O_RDWR|os.O_TRUNC|os.O_CREATE, info.Mode())
if err != nil {
return err
}
defer t.Close()
_, err = io.Copy(t, f)
return err
})
}