/
plugin.go
80 lines (69 loc) · 1.71 KB
/
plugin.go
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package main
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
)
var plugins = map[string]Plugin{}
// Plugin is a caddy plugin.
type Plugin struct {
Name string
Package string
Type string
}
// Build builds the plugin.
func (p Plugin) Build() error {
if err := install(p.Package); err != nil {
return err
}
file, err := generate(pluginPath(p.Type), p)
if err != nil {
return err
}
defer os.Remove(file)
return build(file, filepath.Join(filepath.Dir(file), p.Name+".so"))
}
// Remove uninstalls the plugin.
func (p Plugin) Remove() error {
if !p.Installed() {
return nil
}
return os.Remove(p.PluginFile())
}
// Installed checks if the plugin is installed.
func (p Plugin) Installed() bool {
stat, err := os.Stat(p.PluginFile())
// TODO not all stat errors indicate file not present.
return err == nil && !stat.IsDir()
}
// PluginFile returns the file path to the plugin .so file.
func (p Plugin) PluginFile() string {
return filepath.Join(pluginPath(p.Type), p.Name+".so")
}
func initPlugins() error {
if err := fetchDependencies(); err != nil {
return err
}
for _, fetcher := range fetchers {
p, err := fetcher.FetchPlugins()
if err != nil {
return err
}
for _, plugin := range p {
plugins[plugin.Name] = plugin
}
}
return nil
}
func generate(dir string, p Plugin) (string, error) {
file := filepath.Join(dir, p.Name+".go")
content := strings.Replace(pluginSrc, "{package}", p.Package, -1)
return file, ioutil.WriteFile(file, []byte(content), 0666)
}
func build(src string, output string) error {
return shellCmd{}.run("go", "build", "-buildmode=plugin", "-o", output, src)
}
func install(packageName string) error {
return shellCmd{}.run("go", "get", "-v", packageName)
}