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package api
import (
"bytes"
"fmt"
"io"
"mime"
"os"
"os/exec"
"github.com/aptly-dev/aptly/deb"
"github.com/gin-gonic/gin"
)
// GET /api/graph.:ext?layout=[vertical|horizontal(default)]
func apiGraph(c *gin.Context) {
var (
err error
output []byte
)
ext := c.Params.ByName("ext")
layout := c.Request.URL.Query().Get("layout")
factory := context.NewCollectionFactory()
graph, err := deb.BuildGraph(factory, layout)
if err != nil {
c.JSON(500, err)
return
}
buf := bytes.NewBufferString(graph.String())
if ext == "dot" || ext == "gv" {
// If the raw dot data is requested, return it as string.
// This allows client-side rendering rather than server-side.
c.String(200, buf.String())
return
}
command := exec.Command("dot", "-T"+ext)
command.Stderr = os.Stderr
stdin, err := command.StdinPipe()
if err != nil {
c.AbortWithError(500, err)
return
}
_, err = io.Copy(stdin, buf)
if err != nil {
c.AbortWithError(500, err)
return
}
err = stdin.Close()
if err != nil {
c.AbortWithError(500, err)
return
}
output, err = command.Output()
if err != nil {
c.AbortWithError(500, fmt.Errorf("unable to execute dot: %s (is graphviz package installed?)", err))
return
}
mimeType := mime.TypeByExtension("." + ext)
if mimeType == "" {
mimeType = "application/octet-stream"
}
c.Data(200, mimeType, output)
}
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