Fix dtrace implementation

Now it's at least in a running state.
But we should update it though. A bit rought.

doc/debugging/dtrace.md

@@ -1,3 +1,9 @@
 # DTrace
 
-*TODO: Describe the DTrace capabilities.*
+
+		$ sudo dtrace -l -P resource*
+		ID   PROVIDER                MODULE              FUNCTION NAME
+		4525 resource-machine89061   mod-0x103904cb0     req-start req-start
+		4526 resource-machine89061   mod-0x103904cb0     req-end req-end
+		4527 resource-machine89061   mod-0x103904cb0     decision-start decision-start
+		4528 resource-machine89061   mod-0x103904cb0     decision-end decision-end

examples/demo/tracer.d

@@ -0,0 +1,22 @@
+#!/usr/sbin/dtrace -s
+#pragma D option quiet
+
+resource-machine*:::req-start
+{
+	printf("%s#%i - %s %s \n", copyinstr(arg0), arg1, copyinstr(arg2), copyinstr(arg3));
+}
+
+resource-machine*:::decision-start
+{
+	printf("%s#%i - > %s(%s)\n", copyinstr(arg0), arg1, copyinstr(arg2), copyinstr(arg3));
+}
+
+resource-machine*:::decision-end
+{
+	printf("%s#%i - < %s\n", copyinstr(arg0), arg1, copyinstr(arg2));
+}
+
+resource-machine*:::req-end
+{
+	printf("%s#%i - Finished: %i\n", copyinstr(arg0), arg1, arg2);
+}

lib/debug.js

@@ -11,7 +11,7 @@ module.exports.reqStart = function (req, res) {
 		req.serverName,
 		req.requestId,
 		req.method,
-		req.path,
+		req.route,
 		req.headers
 	]);
 	req.decisionTrace = [];
@@ -42,11 +42,6 @@ module.exports.reqEnd = function (req, res) {
 	} else {
 		req.log.info(payload, 'Successful request to ' + req.url);
 	}
-
-	dtrace.easyFire('decision-end', [
-		req.serverName,
-		req.requestId
-	]);
 };
 
 module.exports.decisionStart = function (req, res, decision) {

lib/decision_core.js

@@ -20,7 +20,7 @@ module.exports.handleRequest = function handleRequest(req, res) {
 		}
 
 		// Ensure bodyStream has finished before closing up.
-		if (res._bodyStream) {
+		if (res._bodyStream && !res._bodyStream._writableState.ended) {
 			res._bodyStream.once('end', suspend(function* () {
 				yield tree.finish(req, res, suspend.resume());
 				res.end();

lib/decision_tree/v3/titles.js

@@ -55,9 +55,10 @@ var decisions = {
 	'v3o14'  : 'Conflict?',
 	'v3o16'  : 'PUT?',
 	'v3o18'  : 'Multiple representations?',
+	'v3o18b'  : 'Multiple representations?(B)',
 	'v3o20'  : 'Response includes an entity?',
 	'v3p3'   : 'Conflict?',
 	'v3p11'  : 'New resource?',
 	'finish' : 'Finish request'
 };
-module.exports.decisionTitles = decisions;
+module.exports = decisions;

lib/server.js

@@ -47,6 +47,8 @@ function Server(options) {
 			requestId: req.requestId
 		});
 
+		req.serverName = self.name;
+
 		decisionCore.handleRequest(req, res);
 	});
 }