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parser.go
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/
parser.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"github.com/mitchellh/colorstring"
"golang.org/x/mod/modfile"
"golang.org/x/mod/module"
)
type Parser struct {
OutputWriter io.Writer
}
func (p *Parser) ParseModfile(path string) error {
// Parse go modules file
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
f, err := modfile.Parse(path, data, nil)
if err != nil {
return err
}
for _, r := range f.Require {
err := p.parseModuleVersionRequirement(r.Mod)
if err != nil {
return err
}
}
return nil
}
func (p *Parser) parseModuleVersionRequirement(mv module.Version) error {
mod, err := goListModules(mv.Path)
if err != nil {
return err
}
if mod.Indirect {
// Skip indirect dependency
return nil
}
if mod.Dir == "" {
err := goModDownload(mv.Path)
if err != nil {
return err
}
// Retry after downloading missing module
return p.parseModuleVersionRequirement(mv)
}
if _, err = os.Stat(filepath.Join(mod.Dir, "go.mod")); os.IsNotExist(err) {
colorstring.Fprintf(p.OutputWriter, "%s @ %s is [bold][red]module-unaware[reset]", mod.Path, mod.Version)
if mod.Update != nil {
// Check go.mod in latest version if update is available
mu := mod.Update
err := goModDownload(mu.Path + "@" + mu.Version)
if err != nil {
return err
}
uMod, err := goListModules(mu.Path + "@" + mu.Version)
if err != nil {
return err
}
if _, err = os.Stat(filepath.Join(uMod.Dir, "go.mod")); err == nil {
colorstring.Fprintf(p.OutputWriter, " [bold][yellow](updatable to %s)[reset]", uMod.Version)
}
}
fmt.Println("")
}
return nil
}
func goModDownload(pkgId string) error {
_, stdErr, err := goCmd("mod", "download", "-json", pkgId)
if err != nil {
return fmt.Errorf("%s\n%s", err, stdErr)
}
return nil
}
func goListModules(pkgId string) (*Module, error) {
outBuffer, _, err := goCmd("list", "-json", "-u", "-m", pkgId)
if err != nil {
return nil, err
}
module := Module{}
err = json.Unmarshal(outBuffer.Bytes(), &module)
if err != nil {
return nil, err
}
return &module, nil
}
func goCmd(args ...string) (*bytes.Buffer, string, error) {
cmd := exec.Command("go", args...)
var stdout, stderr bytes.Buffer
cmd.Env = append(os.Environ(), "GO111MODULE=on")
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
return nil, stderr.String(), fmt.Errorf("%q: %s", args, err)
}
return &stdout, stderr.String(), nil
}