blob: b0ebc1f2e2781b4b8c28e2ebb271500af955f46e [file] [log] [blame]
/*
* Copyright 2022-present Open Networking Foundation
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package sysrepo
//#cgo CFLAGS: -I/usr/include
//#cgo LDFLAGS: -lsysrepo -Wl,--allow-multiple-definition
//#include "plugin.c"
import "C"
import (
"context"
"fmt"
"github.com/opencord/voltha-lib-go/v7/pkg/log"
)
const (
BASE_YANG_MODEL = "bbf-device-aggregation"
DEVICES_YANG_MODEL = "/" + BASE_YANG_MODEL + ":devices"
)
type SysrepoPlugin struct {
connection *C.sr_conn_ctx_t
session *C.sr_session_ctx_t
subscription *C.sr_subscription_ctx_t
}
func errorMsg(code C.int) string {
return C.GoString(C.sr_strerror(code))
}
//createPluginState populates a SysrepoPlugin struct by establishing
//a connection and a session
func (p *SysrepoPlugin) createSession(ctx context.Context) error {
var errCode C.int
//Populates connection
errCode = C.sr_connect(C.SR_CONN_DEFAULT, &p.connection)
if errCode != C.SR_ERR_OK {
err := fmt.Errorf("sysrepo-connect-error")
logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": errorMsg(errCode)})
return err
}
//Populates session
errCode = C.sr_session_start(p.connection, C.SR_DS_RUNNING, &p.session)
if errCode != C.SR_ERR_OK {
err := fmt.Errorf("sysrepo-session-error")
logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": errorMsg(errCode)})
_ = p.Stop(ctx)
return err
}
return nil
}
//export get_data_cb
func get_data_cb() {
//This function is a callback for the retrieval of data from sysrepo
//The "export" comment instructs CGO to create a C function for it
//As a placeholder, it just reports that a request to get data
//has been received from the netconf server
//TODO: get actual information
ctx := context.Background()
logger.Info(ctx, ">>>>>>>RECEIVED REQUEST FROM SYSREPO<<<<<<<")
}
func StartNewPlugin(ctx context.Context) (*SysrepoPlugin, error) {
plugin := &SysrepoPlugin{}
//Open a session to sysrepo
err := plugin.createSession(ctx)
if err != nil {
return nil, err
}
//TODO: could be useful to set it according to the adapter log level
C.sr_log_stderr(C.SR_LL_WRN)
//Set callbacks for events
//Subscribe with a callback to the request of data on a certain path
errCode := C.sr_oper_get_items_subscribe(
plugin.session,
C.CString(BASE_YANG_MODEL),
C.CString(DEVICES_YANG_MODEL+"/*"),
C.function(C.get_data_cb_wrapper),
C.NULL,
C.SR_SUBSCR_CTX_REUSE,
&plugin.subscription,
)
if errCode != C.SR_ERR_OK {
err := fmt.Errorf("sysrepo-failed-subscription-to-get-events")
logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": errorMsg(errCode)})
return nil, err
}
logger.Debug(ctx, "sysrepo-plugin-started")
return plugin, nil
}
func (p *SysrepoPlugin) Stop(ctx context.Context) error {
var errCode C.int
//Frees subscription
if p.subscription != nil {
errCode = C.sr_unsubscribe(p.subscription)
if errCode != C.SR_ERR_OK {
err := fmt.Errorf("failed-to-close-sysrepo-subscription")
logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": errorMsg(errCode)})
return err
}
p.subscription = nil
}
//Frees session
if p.session != nil {
errCode = C.sr_session_stop(p.session)
if errCode != C.SR_ERR_OK {
err := fmt.Errorf("failed-to-close-sysrepo-session")
logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": errorMsg(errCode)})
return err
}
p.session = nil
}
//Frees connection
if p.connection != nil {
errCode = C.sr_disconnect(p.connection)
if errCode != C.SR_ERR_OK {
err := fmt.Errorf("failed-to-close-sysrepo-connection")
logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": errorMsg(errCode)})
return err
}
p.connection = nil
}
logger.Debug(ctx, "sysrepo-plugin-stopped")
return nil
}