Conver the error hook example to a release

examples/error_hook/Makefile

@@ -0,0 +1,14 @@
+PROJECT = error_hook
+
+DEPS = cowboy
+dep_cowboy = pkg://cowboy master
+
+.PHONY: release clean-release
+
+release: clean-release all
+	relx
+
+clean-release:
+	rm -rf _rel
+
+include ../../erlang.mk

examples/error_hook/README.md

@@ -1,22 +1,27 @@
-Cowboy Error Hook
-=================
+Error hook example
+==================
 
-To compile this example you need rebar in your PATH.
+To try this example, you need GNU `make`, `git` and
+[relx](https://github.com/erlware/relx) in your PATH.
 
-Type the following command:
-```
-$ rebar get-deps compile
-```
+To build the example, run the following command:
 
-You can then start the Erlang node with the following command:
+``` bash
+$ make
 ```
-./start.sh
+
+To start the release in the foreground:
+
+``` bash
+$ ./_rel/bin/error_hook_example console
 ```
 
-Then point your browser to the indicated URL.
+Then point your browser at [http://localhost:8080](http://localhost:8080).
+
+Example output
+--------------
 
-Example
--------
+Not found:
 
 ``` bash
 $ curl -i http://localhost:8080
@@ -28,3 +33,23 @@ content-length: 56
 
 404 Not Found: "/" is not the path you are looking for.
 ```
+
+Bad request:
+
+``` bash
+$ telnet localhost 8080
+Trying ::1...
+Connection failed: Connection refused
+Trying 127.0.0.1...
+Connected to localhost.
+Escape character is '^]'.
+bad
+HTTP/1.1 400 Bad Request
+connection: close
+server: Cowboy
+date: Sun, 08 Sep 2013 09:29:27 GMT
+content-length: 15
+
+HTTP Error 400
+Connection closed by foreign host.
+```

examples/error_hook/rebar.config

@@ -1,4 +0,0 @@
-{deps, [
-	{cowboy, ".*",
-		{git, "git://github.com/extend/cowboy.git", "master"}}
-]}.

examples/error_hook/relx.config

@@ -0,0 +1,2 @@
+{release, {error_hook_example, "1"}, [error_hook]}.
+{extended_start_script, true}.

examples/error_hook/src/error_hook.erl

@@ -1,15 +0,0 @@
-%% Feel free to use, reuse and abuse the code in this file.
-
--module(error_hook).
-
-%% API.
--export([start/0]).
-
-%% API.
-
-start() ->
-	ok = application:start(crypto),
-	ok = application:start(cowlib),
-	ok = application:start(ranch),
-	ok = application:start(cowboy),
-	ok = application:start(error_hook).

examples/error_hook/src/error_hook_app.erl

@@ -16,9 +16,26 @@ start(_Type, _Args) ->
 	]),
 	{ok, _} = cowboy:start_http(http, 100, [{port, 8080}], [
 		{env, [{dispatch, Dispatch}]},
-		{onresponse, fun error_hook_responder:respond/4}
+		{onresponse, fun error_hook/4}
 	]),
 	error_hook_sup:start_link().
 
 stop(_State) ->
 	ok.
+
+error_hook(404, Headers, <<>>, Req) ->
+	{Path, Req2} = cowboy_req:path(Req),
+	Body = ["404 Not Found: \"", Path,
+		"\" is not the path you are looking for.\n"],
+	Headers2 = lists:keyreplace(<<"content-length">>, 1, Headers,
+		{<<"content-length">>, integer_to_list(iolist_size(Body))}),
+	{ok, Req3} = cowboy_req:reply(404, Headers2, Body, Req2),
+	Req3;
+error_hook(Code, Headers, <<>>, Req) when is_integer(Code), Code >= 400 ->
+	Body = ["HTTP Error ", integer_to_list(Code), $\n],
+	Headers2 = lists:keyreplace(<<"content-length">>, 1, Headers,
+		{<<"content-length">>, integer_to_list(iolist_size(Body))}),
+	{ok, Req2} = cowboy_req:reply(Code, Headers2, Body, Req),
+	Req2;
+error_hook(_Code, _Headers, _Body, Req) ->
+	Req.

examples/error_hook/src/error_hook_responder.erl

@@ -1,21 +0,0 @@
-%% Feel free to use, reuse and abuse the code in this file.
-
--module(error_hook_responder).
-
--export([respond/4]).
-
-respond(404, Headers, <<>>, Req) ->
-	{Path, Req2} = cowboy_req:path(Req),
-	Body = <<"404 Not Found: \"", Path/binary, "\" is not the path you are looking for.\n">>,
-	Headers2 = lists:keyreplace(<<"content-length">>, 1, Headers,
-		{<<"content-length">>, integer_to_list(byte_size(Body))}),
-	{ok, Req3} = cowboy_req:reply(404, Headers2, Body, Req2),
-	Req3;
-respond(Code, Headers, <<>>, Req) when is_integer(Code), Code >= 400 ->
-	Body = ["HTTP Error ", integer_to_list(Code), $\n],
-	Headers2 = lists:keyreplace(<<"content-length">>, 1, Headers,
-		{<<"content-length">>, integer_to_list(iolist_size(Body))}),
-	{ok, Req2} = cowboy_req:reply(Code, Headers2, Body, Req),
-	Req2;
-respond(_Code, _Headers, _Body, Req) ->
-	Req.

examples/error_hook/start.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-erl -pa ebin deps/*/ebin -s error_hook \
-	-eval "io:format(\"Point your browser at http://localhost:8080~n\")."