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client.go
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client.go
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package plugins
import (
"os"
"os/exec"
"github.com/hashicorp/go-plugin"
"github.com/rancher/opni/pkg/logger"
"github.com/rancher/opni/pkg/plugins/meta"
"go.uber.org/zap"
"google.golang.org/grpc"
)
func ClientConfig(md meta.PluginMeta, scheme meta.Scheme, reattach ...*plugin.ReattachConfig) *plugin.ClientConfig {
//#nosec G204
cmd := exec.Command(md.BinaryPath)
ConfigureSysProcAttr(cmd)
var rc *plugin.ReattachConfig
if len(reattach) > 0 {
rc = reattach[0]
cmd = nil
}
return &plugin.ClientConfig{
Plugins: scheme.PluginMap(),
HandshakeConfig: Handshake,
AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC, plugin.ProtocolNetRPC},
Managed: true,
Cmd: cmd,
Logger: logger.NewHCLogger(logger.New(logger.WithLogLevel(zap.DebugLevel))).Named("plugin"),
SyncStdout: os.Stdout,
SyncStderr: os.Stderr,
Reattach: rc,
}
}
func ServeConfig(scheme meta.Scheme) *plugin.ServeConfig {
return &plugin.ServeConfig{
HandshakeConfig: Handshake,
Plugins: scheme.PluginMap(),
GRPCServer: plugin.DefaultGRPCServer,
Logger: logger.NewForPlugin(),
}
}
func Serve(scheme meta.Scheme) {
plugin.Serve(ServeConfig(scheme))
}
type ActivePlugin struct {
Metadata meta.PluginMeta
GRPCClient *grpc.ClientConn
RPCClient *plugin.RPCClient
Raw interface{}
}
type PluginLoader struct {
ActivePlugins map[string][]ActivePlugin
Logger *zap.SugaredLogger
}
func NewPluginLoader() *PluginLoader {
return &PluginLoader{
ActivePlugins: map[string][]ActivePlugin{},
Logger: logger.New().Named("pluginloader"),
}
}
func (pl *PluginLoader) Load(md meta.PluginMeta, cc *plugin.ClientConfig) {
lg := pl.Logger
client := plugin.NewClient(cc)
rpcClient, err := client.Client()
if err != nil {
lg.With(
zap.Error(err),
"plugin", md.Module,
).Error("failed to load plugin")
return
}
lg.With(
"plugin", md.Module,
).Debug("checking if plugin implements any interfaces in the scheme")
for id := range cc.Plugins {
raw, err := rpcClient.Dispense(id)
if err != nil {
lg.With(
zap.Error(err),
"plugin", md.Module,
"id", id,
).Debug("no implementation found")
continue
}
lg.With(
"plugin", md.Module,
"id", id,
).Debug("implementation found")
switch c := rpcClient.(type) {
case *plugin.GRPCClient:
pl.ActivePlugins[id] = append(pl.ActivePlugins[id], ActivePlugin{
Metadata: md,
GRPCClient: c.Conn,
Raw: raw,
})
case *plugin.RPCClient:
pl.ActivePlugins[id] = append(pl.ActivePlugins[id], ActivePlugin{
Metadata: md,
RPCClient: c,
Raw: raw,
})
}
}
}
func (pl *PluginLoader) DispenseAll(id string) []ActivePlugin {
return pl.ActivePlugins[id]
}
type TypedActivePlugin[T any] struct {
Metadata meta.PluginMeta
Client *grpc.ClientConn
Typed T
}
func DispenseAllAs[T any](pl *PluginLoader, id string) []TypedActivePlugin[T] {
var typed []TypedActivePlugin[T]
for _, ap := range pl.DispenseAll(id) {
typed = append(typed, TypedActivePlugin[T]{
Metadata: ap.Metadata,
Client: ap.GRPCClient,
Typed: ap.Raw.(T),
})
}
return typed
}