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adr.go
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adr.go
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package adr
import (
"fmt"
"os/exec"
"github.com/hashicorp/go-plugin"
"github.com/pkg/errors"
"github.com/brocaar/chirpstack-network-server/v3/adr"
"github.com/brocaar/chirpstack-network-server/v3/internal/config"
)
var (
handlers map[string]adr.Handler
handlerNames map[string]string
)
func init() {
defH := &DefaultHandler{}
defID, _ := defH.ID()
defName, _ := defH.Name()
lrFHSSH := &LRFHSSHandler{}
lrFHSSID, _ := lrFHSSH.ID()
lrFHSSName, _ := lrFHSSH.Name()
loRaLRFHSSH := &LoRaLRFHSSHandler{}
loraLRFHSSID, _ := loRaLRFHSSH.ID()
loraLRFHSSName, _ := loRaLRFHSSH.Name()
handlers = map[string]adr.Handler{
defID: defH,
loraLRFHSSID: loRaLRFHSSH,
lrFHSSID: lrFHSSH,
}
handlerNames = map[string]string{
defID: defName,
loraLRFHSSID: loraLRFHSSName,
lrFHSSID: lrFHSSName,
}
}
// Setup configures the ADR package.
func Setup(conf config.Config) error {
for _, adrPlugin := range conf.NetworkServer.NetworkSettings.ADRPlugins {
client := plugin.NewClient(&plugin.ClientConfig{
HandshakeConfig: adr.HandshakeConfig,
Plugins: map[string]plugin.Plugin{
"handler": &adr.HandlerPlugin{},
},
Cmd: exec.Command(adrPlugin),
})
// connect via RPC
rpcClient, err := client.Client()
if err != nil {
return errors.Wrap(err, "plugin rpc client error")
}
// request the plugin
raw, err := rpcClient.Dispense("handler")
if err != nil {
return errors.Wrap(err, "request handler plugin error")
}
// cast to Handler.
handler, ok := raw.(adr.Handler)
if !ok {
return fmt.Errorf("expected adr.Handler, got: %T", raw)
}
// get ID.
id, err := handler.ID()
if err != nil {
return errors.Wrap(err, "get plugin id error")
}
// get Name.
name, err := handler.Name()
if err != nil {
return errors.Wrap(err, "get plugin name error")
}
handlers[id] = handler
handlerNames[id] = name
}
return nil
}
// GetHandler returns the ADR handler by its ID, failing that it returns the
// default ADR handler.
func GetHandler(id string) adr.Handler {
h, ok := handlers[id]
if !ok {
return &DefaultHandler{}
}
return h
}
// GetADRAlgorithms returns the available ADR algorithms.
func GetADRAlgorithms() map[string]string {
return handlerNames
}