terraform: GraphDot

command/graph.go

@@ -1,13 +1,12 @@
 package command
 
 import (
-	"bytes"
 	"flag"
 	"fmt"
 	"os"
 	"strings"
 
-	"github.com/hashicorp/terraform/digraph"
+	"github.com/hashicorp/terraform/terraform"
 )
 
 // GraphCommand is a Command implementation that takes a Terraform
@@ -53,14 +52,7 @@ func (c *GraphCommand) Run(args []string) int {
 		return 1
 	}
 
-	buf := new(bytes.Buffer)
-	nodes := make([]digraph.Node, len(g.Nouns))
-	for i, n := range g.Nouns {
-		nodes[i] = n
-	}
-	digraph.GenerateDot(nodes, buf)
-
-	c.Ui.Output(buf.String())
+	c.Ui.Output(terraform.GraphDot(g))
 
 	return 0
 }

terraform/graph_dot.go

@@ -0,0 +1,200 @@
+package terraform
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/hashicorp/terraform/depgraph"
+)
+
+// GraphDot returns the dot formatting of a visual representation of
+// the given Terraform graph.
+func GraphDot(g *depgraph.Graph) string {
+	buf := new(bytes.Buffer)
+	buf.WriteString("digraph {\n")
+
+	// Determine and add the title
+	// graphDotTitle(buf, g)
+
+	// Add all the resource.
+	graphDotAddResources(buf, g)
+
+	// Add all the resource providers
+	graphDotAddResourceProviders(buf, g)
+
+	buf.WriteString("}\n")
+	return buf.String()
+}
+
+func graphDotAddRoot(buf *bytes.Buffer, n *depgraph.Noun) {
+	buf.WriteString(fmt.Sprintf("\t\"%s\" [shape=circle];\n", "root"))
+
+	for _, e := range n.Edges() {
+		target := e.Tail()
+		buf.WriteString(fmt.Sprintf(
+			"\t\"%s\" -> \"%s\";\n",
+			"root",
+			target))
+	}
+}
+
+func graphDotAddResources(buf *bytes.Buffer, g *depgraph.Graph) {
+	// Determine if we have diffs. If we do, then we're graphing a
+	// plan, which alters our graph a bit.
+	hasDiff := false
+	for _, n := range g.Nouns {
+		rn, ok := n.Meta.(*GraphNodeResource)
+		if !ok {
+			continue
+		}
+		if rn.Resource.Diff != nil && !rn.Resource.Diff.Empty() {
+			hasDiff = true
+			break
+		}
+	}
+
+	var edgeBuf bytes.Buffer
+	// Do all the non-destroy resources
+	buf.WriteString("\tsubgraph {\n")
+	for _, n := range g.Nouns {
+		rn, ok := n.Meta.(*GraphNodeResource)
+		if !ok {
+			continue
+		}
+		if rn.Resource.Diff != nil && rn.Resource.Diff.Destroy {
+			continue
+		}
+
+		// If we have diffs then we're graphing a plan. If we don't have
+		// have a diff on this resource, don't graph anything, since the
+		// plan wouldn't do anything to this resource.
+		if hasDiff {
+			if rn.Resource.Diff == nil || rn.Resource.Diff.Empty() {
+				continue
+			}
+		}
+
+		// Determine the colors. White = no change, yellow = change,
+		// green = create. Destroy is in the next section.
+		var color, fillColor string
+		if rn.Resource.Diff != nil && !rn.Resource.Diff.Empty() {
+			if rn.Resource.State != nil && rn.Resource.State.ID != "" {
+				color = "#FFFF00"
+				fillColor = "#FFFF94"
+			} else {
+				color = "#00FF00"
+				fillColor = "#9EFF9E"
+			}
+		}
+
+		// Create this node.
+		buf.WriteString(fmt.Sprintf("\t\t\"%s\" [\n", n))
+		buf.WriteString("\t\t\tshape=box\n")
+		if color != "" {
+			buf.WriteString("\t\t\tstyle=filled\n")
+			buf.WriteString(fmt.Sprintf("\t\t\tcolor=\"%s\"\n", color))
+			buf.WriteString(fmt.Sprintf("\t\t\tfillcolor=\"%s\"\n", fillColor))
+		}
+		buf.WriteString("\t\t];\n")
+
+		// Build up all the edges in a separate buffer so they're not in the
+		// subgraph.
+		for _, e := range n.Edges() {
+			target := e.Tail()
+			edgeBuf.WriteString(fmt.Sprintf(
+				"\t\"%s\" -> \"%s\";\n",
+				n,
+				target))
+		}
+	}
+	buf.WriteString("\t}\n\n")
+	if edgeBuf.Len() > 0 {
+		buf.WriteString(edgeBuf.String())
+		buf.WriteString("\n")
+	}
+
+	// Do all the destroy resources
+	edgeBuf.Reset()
+	buf.WriteString("\tsubgraph {\n")
+	for _, n := range g.Nouns {
+		rn, ok := n.Meta.(*GraphNodeResource)
+		if !ok {
+			continue
+		}
+		if rn.Resource.Diff == nil || !rn.Resource.Diff.Destroy {
+			continue
+		}
+
+		buf.WriteString(fmt.Sprintf(
+			"\t\t\"%s\" [shape=box,style=filled,color=\"#FF0000\",fillcolor=\"#FF9494\"];\n", n))
+
+		for _, e := range n.Edges() {
+			target := e.Tail()
+			edgeBuf.WriteString(fmt.Sprintf(
+				"\t\"%s\" -> \"%s\";\n",
+				n,
+				target))
+		}
+	}
+	buf.WriteString("\t}\n\n")
+	if edgeBuf.Len() > 0 {
+		buf.WriteString(edgeBuf.String())
+		buf.WriteString("\n")
+	}
+}
+
+func graphDotAddResourceProviders(buf *bytes.Buffer, g *depgraph.Graph) {
+	var edgeBuf bytes.Buffer
+	buf.WriteString("\tsubgraph {\n")
+	for _, n := range g.Nouns {
+		_, ok := n.Meta.(*GraphNodeResourceProvider)
+		if !ok {
+			continue
+		}
+
+		// Create this node.
+		buf.WriteString(fmt.Sprintf("\t\t\"%s\" [\n", n))
+		buf.WriteString("\t\t\tshape=diamond\n")
+		buf.WriteString("\t\t];\n")
+
+		// Build up all the edges in a separate buffer so they're not in the
+		// subgraph.
+		for _, e := range n.Edges() {
+			target := e.Tail()
+			edgeBuf.WriteString(fmt.Sprintf(
+				"\t\"%s\" -> \"%s\";\n",
+				n,
+				target))
+		}
+	}
+	buf.WriteString("\t}\n\n")
+	if edgeBuf.Len() > 0 {
+		buf.WriteString(edgeBuf.String())
+		buf.WriteString("\n")
+	}
+}
+
+func graphDotTitle(buf *bytes.Buffer, g *depgraph.Graph) {
+	// Determine if we have diffs. If we do, then we're graphing a
+	// plan, which alters our graph a bit.
+	hasDiff := false
+	for _, n := range g.Nouns {
+		rn, ok := n.Meta.(*GraphNodeResource)
+		if !ok {
+			continue
+		}
+		if rn.Resource.Diff != nil && !rn.Resource.Diff.Empty() {
+			hasDiff = true
+			break
+		}
+	}
+
+	graphType := "Configuration"
+	if hasDiff {
+		graphType = "Plan"
+	}
+	title := fmt.Sprintf("Terraform %s Resource Graph", graphType)
+
+	buf.WriteString(fmt.Sprintf("\tlabel=\"%s\\n\\n\\n\";\n", title))
+	buf.WriteString("\tlabelloc=\"t\";\n\n")
+}