go.ligato.io/vpp-agent/v3@v3.5.0/pkg/graphviz/graphviz_cgo.go (about)

     1  //  Copyright (c) 2020 Cisco and/or its affiliates.
     2  //
     3  //  Licensed under the Apache License, Version 2.0 (the "License");
     4  //  you may not use this file except in compliance with the License.
     5  //  You may obtain a copy of the License at:
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  //  Unless required by applicable law or agreed to in writing, software
    10  //  distributed under the License is distributed on an "AS IS" BASIS,
    11  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //  See the License for the specific language governing permissions and
    13  //  limitations under the License.
    14  
    15  //go:build cgo
    16  
    17  package graphviz
    18  
    19  import (
    20  	"bytes"
    21  	"log"
    22  
    23  	"github.com/goccy/go-graphviz"
    24  )
    25  
    26  func RenderFilename(outfname, format string, dot []byte) error {
    27  	g, err := graphviz.ParseBytes(dot)
    28  	if err != nil {
    29  		return err
    30  	}
    31  
    32  	gv := graphviz.New()
    33  	defer func() {
    34  		if err := g.Close(); err != nil {
    35  			log.Println("dotgraph: closing graph: %w", err)
    36  		}
    37  		_ = gv.Close()
    38  	}()
    39  
    40  	err = gv.RenderFilename(g, graphviz.Format(format), outfname)
    41  	if err != nil {
    42  		return err
    43  	}
    44  
    45  	return nil
    46  }
    47  
    48  func RenderDot(dot []byte) ([]byte, error) {
    49  	g, err := graphviz.ParseBytes(dot)
    50  	if err != nil {
    51  		return nil, err
    52  	}
    53  
    54  	gv := graphviz.New()
    55  	defer func() {
    56  		if err := g.Close(); err != nil {
    57  			log.Println("dotgraph: closing graph: %w", err)
    58  		}
    59  		_ = gv.Close()
    60  	}()
    61  
    62  	var buf bytes.Buffer
    63  	err = gv.Render(g, "dot", &buf)
    64  	if err != nil {
    65  		return nil, err
    66  	}
    67  
    68  	return buf.Bytes(), nil
    69  }