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plugin.go
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plugin.go
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package http
import (
"context"
"crypto/tls"
"net"
"github.com/gin-gonic/gin"
"github.com/hashicorp/go-plugin"
"go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin"
"google.golang.org/grpc"
"github.com/rancher/opni/pkg/plugins"
"github.com/rancher/opni/pkg/plugins/apis/apiextensions"
)
const (
HTTPAPIExtensionPluginID = "opni.apiextensions.HTTPAPIExtension"
ServiceID = "apiextensions.HTTPAPIExtension"
)
type HTTPAPIExtension interface {
ConfigureRoutes(*gin.Engine)
}
type httpApiExtensionPlugin struct {
plugin.NetRPCUnsupportedPlugin
apiextensions.UnimplementedHTTPAPIExtensionServer
router *gin.Engine
impl HTTPAPIExtension
}
var _ plugin.Plugin = (*httpApiExtensionPlugin)(nil)
// Plugin side
func (p *httpApiExtensionPlugin) GRPCServer(
_ *plugin.GRPCBroker,
s *grpc.Server,
) error {
p.router = gin.New()
apiextensions.RegisterHTTPAPIExtensionServer(s, p)
return nil
}
func (p *httpApiExtensionPlugin) Configure(
_ context.Context,
certCfg *apiextensions.CertConfig,
) (*apiextensions.HTTPAPIExtensionConfig, error) {
var listener net.Listener
var err error
if certCfg.Insecure {
listener, err = net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return nil, err
}
} else {
tlsCfg, err := certCfg.TLSConfig()
if err != nil {
return nil, err
}
listener, err = tls.Listen("tcp4", "127.0.0.1:0", tlsCfg)
if err != nil {
return nil, err
}
}
p.router.Use(otelgin.Middleware("http-api"))
p.impl.ConfigureRoutes(p.router)
go func() {
if err := p.router.RunListener(listener); err != nil {
panic(err)
}
}()
routes := []*apiextensions.RouteInfo{}
for _, rt := range p.router.Routes() {
routes = append(routes, &apiextensions.RouteInfo{
Path: rt.Path,
Method: rt.Method,
})
}
return &apiextensions.HTTPAPIExtensionConfig{
HttpAddr: listener.Addr().String(),
Routes: routes,
}, nil
}
// Server side
func (p *httpApiExtensionPlugin) GRPCClient(
ctx context.Context,
_ *plugin.GRPCBroker,
c *grpc.ClientConn,
) (interface{}, error) {
if err := plugins.CheckAvailability(ctx, c, ServiceID); err != nil {
return nil, err
}
return apiextensions.NewHTTPAPIExtensionClient(c), nil
}
func NewPlugin(impl HTTPAPIExtension) plugin.Plugin {
return &httpApiExtensionPlugin{
impl: impl,
}
}
func init() {
plugins.GatewayScheme.Add(HTTPAPIExtensionPluginID, NewPlugin(nil))
plugins.AgentScheme.Add(HTTPAPIExtensionPluginID, NewPlugin(nil))
}