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loader.go
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loader.go
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package pluggable
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"strings"
"get.porter.sh/porter/pkg/config"
"get.porter.sh/porter/pkg/plugins"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-plugin"
"github.com/pkg/errors"
)
// PluginLoader handles finding, configuring and loading porter plugins.
type PluginLoader struct {
*config.Config
SelectedPluginKey *plugins.PluginKey
SelectedPluginConfig interface{}
}
func NewPluginLoader(c *config.Config) *PluginLoader {
return &PluginLoader{
Config: c,
}
}
// Load a plugin, returning the plugin's interface which the caller must then cast to
// the typed interface, a cleanup function to stop the plugin when finished communicating with it,
// and an error if the plugin could not be loaded.
func (l *PluginLoader) Load(pluginType PluginTypeConfig) (interface{}, func(), error) {
err := l.selectPlugin(pluginType)
if err != err {
return nil, nil, err
}
l.SelectedPluginKey.Interface = pluginType.Interface
var pluginCommand *exec.Cmd
if l.SelectedPluginKey.IsInternal {
porterPath, err := l.GetPorterPath()
if err != nil {
return nil, nil, errors.Wrap(err, "could not determine the path to the porter client")
}
pluginCommand = l.NewCommand(porterPath, "plugin", "run", l.SelectedPluginKey.String())
} else {
pluginPath, err := l.GetPluginPath(l.SelectedPluginKey.Binary)
if err != nil {
return nil, nil, err
}
pluginCommand = l.NewCommand(pluginPath, "run", l.SelectedPluginKey.String())
}
configReader, err := l.readPluginConfig()
if err != err {
return nil, nil, err
}
pluginCommand.Stdin = configReader
// Explicitly set PORTER_HOME for the plugin
pluginCommand.Env = os.Environ()
if _, homeSet := os.LookupEnv(config.EnvHOME); !homeSet {
home, err := l.GetHomeDir()
if err != nil {
return nil, nil, err
}
pluginCommand.Env = append(pluginCommand.Env, fmt.Sprintf("PORTER_HOME=%s", home))
}
if l.DebugPlugins {
fmt.Fprintf(l.Err, "Resolved %s plugin to %s\n", pluginType.Interface, l.SelectedPluginKey)
if l.SelectedPluginConfig != nil {
fmt.Fprintf(l.Err, "Resolved plugin config: \n %#v\n", l.SelectedPluginConfig)
}
fmt.Fprintln(l.Err, strings.Join(pluginCommand.Args, " "))
}
pluginOutput := bytes.NewBufferString("")
logger := hclog.New(&hclog.LoggerOptions{
Name: "porter",
Output: pluginOutput,
Level: hclog.Debug,
JSONFormat: true,
})
if l.DebugPlugins {
logger.SetLevel(hclog.Info)
go l.logPluginMessages(pluginOutput)
}
pluginTypes := map[string]plugin.Plugin{
pluginType.Interface: pluginType.Plugin,
}
var errbuf bytes.Buffer
client := plugin.NewClient(&plugin.ClientConfig{
HandshakeConfig: plugins.HandshakeConfig,
Plugins: pluginTypes,
Cmd: pluginCommand,
Logger: logger,
Stderr: &errbuf,
})
cleanup := func() {
client.Kill()
}
// Connect via RPC
rpcClient, err := client.Client()
if err != nil {
cleanup()
if stderr := errbuf.String(); stderr != "" {
err = errors.Wrap(errors.New(stderr), err.Error())
}
return nil, nil, errors.Wrapf(err, "could not connect to the %s plugin", l.SelectedPluginKey)
}
// Request the plugin
raw, err := rpcClient.Dispense(pluginType.Interface)
if err != nil {
cleanup()
return nil, nil, errors.Wrapf(err, "could not connect to the %s plugin", l.SelectedPluginKey)
}
return raw, cleanup, nil
}
func (l *PluginLoader) logPluginMessages(pluginOutput io.Reader) {
r := bufio.NewReader(pluginOutput)
for {
line, err := r.ReadString('\n')
if err != nil {
continue
}
if len(line) == 0 {
return
}
var pluginLog map[string]string
err = json.Unmarshal([]byte(line), &pluginLog)
if err != nil {
continue
}
fmt.Fprintln(l.Err, pluginLog["@message"])
}
}
// selectPlugin picks the plugin to use and loads its configuration.
func (l *PluginLoader) selectPlugin(cfg PluginTypeConfig) error {
l.SelectedPluginKey = nil
l.SelectedPluginConfig = nil
var pluginKey string
defaultStore := cfg.GetDefaultPluggable(l.Config.Data)
if defaultStore != "" {
is, err := cfg.GetPluggable(l.Config.Data, defaultStore)
if err != nil {
return err
}
pluginKey = is.GetPluginSubKey()
l.SelectedPluginConfig = is.GetConfig()
}
// If there isn't a specific plugin configured for this plugin type, fall back to the default plugin for this type
if pluginKey == "" {
pluginKey = cfg.GetDefaultPlugin(l.Config.Data)
}
key, err := plugins.ParsePluginKey(pluginKey)
if err != nil {
return err
}
l.SelectedPluginKey = &key
return nil
}
func (l *PluginLoader) readPluginConfig() (io.Reader, error) {
if l.SelectedPluginConfig == nil {
return &bytes.Buffer{}, nil
}
b, err := json.Marshal(l.SelectedPluginConfig)
if err != nil {
return nil, errors.Wrapf(err, "could not marshal plugin config %#v", l.SelectedPluginConfig)
}
return bytes.NewBuffer(b), nil
}