| /* |
| * 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 LDFLAGS: -lsysrepo -lyang -Wl,--allow-multiple-definition |
| //#include "plugin.c" |
| import "C" |
| import ( |
| "context" |
| "fmt" |
| "unsafe" |
| |
| "github.com/opencord/voltha-lib-go/v7/pkg/log" |
| "github.com/opencord/voltha-northbound-bbf-adapter/internal/core" |
| ) |
| |
| //srErrorMsg provides a description of a sysrepo error code |
| func srErrorMsg(code C.int) string { |
| return C.GoString(C.sr_strerror(code)) |
| } |
| |
| //lyErrorMsg provides the last libyang error message |
| func lyErrorMsg(ly_ctx *C.ly_ctx) string { |
| lyErrString := C.ly_errmsg(ly_ctx) |
| defer freeCString(lyErrString) |
| |
| return C.GoString(lyErrString) |
| } |
| |
| func freeCString(str *C.char) { |
| if str != nil { |
| C.free(unsafe.Pointer(str)) |
| str = nil |
| } |
| } |
| |
| //Creates a new libyang nodes tree from a set of new paths. |
| //The tree must bee manually freed after its use with C.lyd_free_all or |
| //an equivalent function |
| func createYangTree(ctx context.Context, session *C.sr_session_ctx_t, items []core.YangItem) (*C.lyd_node, error) { |
| if len(items) == 0 { |
| return nil, fmt.Errorf("no-items") |
| } |
| |
| conn := C.sr_session_get_connection(session) |
| if conn == nil { |
| return nil, fmt.Errorf("null-connection") |
| } |
| |
| //libyang context |
| ly_ctx := C.sr_acquire_context(conn) |
| if ly_ctx == nil { |
| return nil, fmt.Errorf("null-libyang-context") |
| } |
| defer C.sr_release_context(conn) |
| |
| //Create parent node |
| parentPath := C.CString(items[0].Path) |
| parentValue := C.CString(items[0].Value) |
| |
| var parent *C.lyd_node |
| lyErr := C.lyd_new_path(nil, ly_ctx, parentPath, parentValue, 0, &parent) |
| if lyErr != C.LY_SUCCESS { |
| err := fmt.Errorf("libyang-new-path-failed: %d %s", lyErr, lyErrorMsg(ly_ctx)) |
| return nil, err |
| } |
| logger.Debugw(ctx, "creating-yang-item", log.Fields{"item": items[0]}) |
| |
| freeCString(parentPath) |
| freeCString(parentValue) |
| |
| //Add remaining nodes |
| for _, item := range items[1:] { |
| logger.Debugw(ctx, "creating-yang-item", log.Fields{"item": item}) |
| |
| path := C.CString(item.Path) |
| value := C.CString(item.Value) |
| |
| lyErr := C.lyd_new_path(parent, ly_ctx, path, value, 0, nil) |
| if lyErr != C.LY_SUCCESS { |
| freeCString(path) |
| freeCString(value) |
| |
| //Free the partially created tree |
| C.lyd_free_all(parent) |
| |
| err := fmt.Errorf("libyang-new-path-failed: %d %s", lyErr, lyErrorMsg(ly_ctx)) |
| |
| return nil, err |
| } |
| |
| freeCString(path) |
| freeCString(value) |
| } |
| |
| return parent, nil |
| } |
| |
| //Creates a set of new paths under an existing libyang tree parent node |
| func updateYangTree(ctx context.Context, session *C.sr_session_ctx_t, parent **C.lyd_node, items []core.YangItem) error { |
| if len(items) == 0 { |
| //Nothing to do |
| return nil |
| } |
| |
| conn := C.sr_session_get_connection(session) |
| if conn == nil { |
| return fmt.Errorf("null-connection") |
| } |
| |
| //libyang context |
| ly_ctx := C.sr_acquire_context(conn) |
| if ly_ctx == nil { |
| return fmt.Errorf("null-libyang-context") |
| } |
| defer C.sr_release_context(conn) |
| |
| for _, item := range items { |
| logger.Debugw(ctx, "updating-yang-item", log.Fields{"item": item}) |
| |
| path := C.CString(item.Path) |
| value := C.CString(item.Value) |
| |
| lyErr := C.lyd_new_path(*parent, ly_ctx, path, value, 0, nil) |
| if lyErr != C.LY_SUCCESS { |
| freeCString(path) |
| freeCString(value) |
| |
| err := fmt.Errorf("libyang-new-path-failed: %d %s", lyErr, lyErrorMsg(ly_ctx)) |
| |
| return err |
| } |
| |
| freeCString(path) |
| freeCString(value) |
| } |
| |
| return nil |
| } |
| |
| //Merges the content of a yang tree with the content of the datastore. |
| //The target datastore is the one on which the session has been created |
| func editDatastore(ctx context.Context, session *C.sr_session_ctx_t, editsTree *C.lyd_node) error { |
| errCode := C.sr_edit_batch(session, editsTree, C.mergeOperation) |
| if errCode != C.SR_ERR_OK { |
| err := fmt.Errorf("failed-to-edit-datastore") |
| logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": srErrorMsg(errCode)}) |
| return err |
| } |
| |
| errCode = C.sr_apply_changes(session, 0) |
| if errCode != C.SR_ERR_OK { |
| err := fmt.Errorf("failed-to-apply-datastore-changes") |
| logger.Errorw(ctx, err.Error(), log.Fields{"errCode": errCode, "errMsg": srErrorMsg(errCode)}) |
| return err |
| } |
| |
| return nil |
| } |