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