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// Copyright 2018 Google Inc. All Rights Reserved.
// This file is available under the Apache license.
/*
Command mdot turns an mtail program AST into a graphviz graph on standard output.
To use, run it like (assuming your shell is in the same directory as this file)
go run github.com/jaqx0r/mtail/cmd/mdot --prog ../../examples/dhcpd.mtail | xdot -
or
go run github.com/jaqx0r/mtail/cmd/mdot --prog ../../examples/dhcpd.mtail --http_port 8080
to view the dot output visit http://localhost:8080
You'll need the graphviz `dot' command installed.
*/
package main
import (
"flag"
"fmt"
"io"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/golang/glog"
"github.com/jaqx0r/mtail/internal/mtail"
"github.com/jaqx0r/mtail/internal/runtime/compiler/ast"
"github.com/jaqx0r/mtail/internal/runtime/compiler/checker"
"github.com/jaqx0r/mtail/internal/runtime/compiler/parser"
)
var (
prog = flag.String("prog", "", "Name of the program source to parse.")
httpPort = flag.String("http_port", "", "Port number to run HTTP server on.")
)
type dotter struct {
w io.Writer
id int
parentID []int // id of the parent node
}
func (d *dotter) nextID() int {
d.id++
return d.id
}
func (d *dotter) emitNode(id int, node ast.Node) {
attrs := map[string]string{
"label": strings.Split(fmt.Sprintf("%T", node), ".")[1] + "\n",
"shape": "box",
"style": "filled",
"tooltip": node.Type().String(),
}
switch n := node.(type) {
case *ast.VarDecl, *ast.DecoDecl:
attrs["fillcolor"] = "lightgreen"
switch n := n.(type) {
case *ast.VarDecl:
attrs["label"] += fmt.Sprintf("%s %s", n.Kind, n.Name)
case *ast.DecoDecl:
attrs["label"] += n.Name
}
case *ast.IDTerm, *ast.CaprefTerm:
attrs["fillcolor"] = "pink"
attrs["shape"] = "ellipse"
switch n := n.(type) {
case *ast.IDTerm:
attrs["label"] += n.Name
case *ast.CaprefTerm:
attrs["label"] += fmt.Sprintf("$%s", n.Name)
}
case *ast.IntLit, *ast.FloatLit, *ast.PatternLit, *ast.StringLit:
attrs["fillcolor"] = "pink"
attrs["shape"] = "ellipse"
switch n := n.(type) {
case *ast.IntLit:
attrs["label"] += fmt.Sprintf("%d", n.I)
case *ast.FloatLit:
attrs["label"] += fmt.Sprintf("%g", n.F)
case *ast.PatternLit:
attrs["label"] += fmt.Sprintf("/%s/", n.Pattern)
case *ast.StringLit:
attrs["label"] += n.Text
}
case *ast.IndexedExpr, *ast.BinaryExpr, *ast.UnaryExpr, *ast.PatternExpr, *ast.BuiltinExpr:
attrs["fillcolor"] = "lightblue"
switch n := n.(type) {
case *ast.BinaryExpr:
attrs["label"] += parser.Kind(n.Op).String()
case *ast.UnaryExpr:
attrs["label"] += parser.Kind(n.Op).String()
case *ast.BuiltinExpr:
attrs["label"] += n.Name
}
}
pos := node.Pos()
if pos != nil {
attrs["xlabel"] = pos.String()
}
fmt.Fprintf(d.w, "n%d [", id)
for k, v := range attrs {
fmt.Fprintf(d.w, "%s=\"%s\" ", k, v)
}
fmt.Fprintf(d.w, "]\n")
}
func (d *dotter) emitLine(src, dst int) {
fmt.Fprintf(d.w, "n%d -> n%d\n", src, dst)
}
func (d *dotter) VisitBefore(node ast.Node) (ast.Visitor, ast.Node) {
id := d.nextID()
d.emitNode(id, node)
if len(d.parentID) > 0 {
parentID := d.parentID[len(d.parentID)-1]
d.emitLine(parentID, id)
}
d.parentID = append(d.parentID, id)
return d, node
}
func (d *dotter) VisitAfter(node ast.Node) ast.Node {
d.parentID = d.parentID[:len(d.parentID)-1]
return node
}
func makeDot(name string, w io.Writer) error {
f, err := os.Open(filepath.Clean(name))
if err != nil {
return err
}
n, err := parser.Parse(name, f)
if err != nil {
return err
}
n, err = checker.Check(n, 0, 0)
if err != nil {
return err
}
fmt.Fprintf(w, "digraph \"%s\" {\n", *prog)
dot := &dotter{w: w}
ast.Walk(dot, n)
fmt.Fprintf(w, "}\n")
return nil
}
func main() {
flag.Parse()
if *prog == "" {
glog.Exitf("No -prog given")
}
if *httpPort == "" {
glog.Exit(makeDot(*prog, os.Stdout))
}
http.HandleFunc("/",
func(w http.ResponseWriter, _ *http.Request) {
dot := exec.Command("dot", "-Tsvg")
in, err := dot.StdinPipe()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
out, err := dot.StdoutPipe()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
err = dot.Start()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
err = makeDot(*prog, in)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
err = in.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Add("Content-type", "image/svg+xml")
w.WriteHeader(http.StatusOK)
_, err = io.Copy(w, out)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
err = dot.Wait()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
})
http.HandleFunc("/favicon.ico", mtail.FaviconHandler)
glog.Info(http.ListenAndServe(fmt.Sprintf(":%s", *httpPort), nil))
}
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