From 370b3d96485daa2bac0ed4aebecb867dca5f8d3e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Sat, 21 Jul 2012 21:46:21 +0200
Subject: Add a GET echo example

---
 examples/echo_get/README.md               | 17 +++++++++++++++++
 examples/echo_get/rebar.config            |  4 ++++
 examples/echo_get/src/echo_get.app.src    | 15 +++++++++++++++
 examples/echo_get/src/echo_get.erl        | 12 ++++++++++++
 examples/echo_get/src/echo_get_app.erl    | 26 ++++++++++++++++++++++++++
 examples/echo_get/src/echo_get_sup.erl    | 23 +++++++++++++++++++++++
 examples/echo_get/src/toppage_handler.erl | 29 +++++++++++++++++++++++++++++
 examples/echo_get/start.sh                |  3 +++
 8 files changed, 129 insertions(+)
 create mode 100644 examples/echo_get/README.md
 create mode 100644 examples/echo_get/rebar.config
 create mode 100644 examples/echo_get/src/echo_get.app.src
 create mode 100644 examples/echo_get/src/echo_get.erl
 create mode 100644 examples/echo_get/src/echo_get_app.erl
 create mode 100644 examples/echo_get/src/echo_get_sup.erl
 create mode 100644 examples/echo_get/src/toppage_handler.erl
 create mode 100755 examples/echo_get/start.sh

diff --git a/examples/echo_get/README.md b/examples/echo_get/README.md
new file mode 100644
index 0000000..9a09ca1
--- /dev/null
+++ b/examples/echo_get/README.md
@@ -0,0 +1,17 @@
+Cowboy GET Echo
+===============
+
+To compile this example you need rebar in your PATH.
+
+Type the following command:
+```
+$ rebar get-deps compile
+```
+
+You can then start the Erlang node with the following command:
+```
+./start.sh
+```
+
+Then point your browser to the indicated URL. You can change
+the GET parameter to check that the handler is echoing properly.
diff --git a/examples/echo_get/rebar.config b/examples/echo_get/rebar.config
new file mode 100644
index 0000000..6ad3062
--- /dev/null
+++ b/examples/echo_get/rebar.config
@@ -0,0 +1,4 @@
+{deps, [
+	{cowboy, ".*",
+		{git, "git://github.com/extend/cowboy.git", "master"}}
+]}.
diff --git a/examples/echo_get/src/echo_get.app.src b/examples/echo_get/src/echo_get.app.src
new file mode 100644
index 0000000..ecbf01a
--- /dev/null
+++ b/examples/echo_get/src/echo_get.app.src
@@ -0,0 +1,15 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+{application, echo_get, [
+	{description, "Cowboy GET echo example."},
+	{vsn, "1"},
+	{modules, []},
+	{registered, []},
+	{applications, [
+		kernel,
+		stdlib,
+		cowboy
+	]},
+	{mod, {echo_get_app, []}},
+	{env, []}
+]}.
diff --git a/examples/echo_get/src/echo_get.erl b/examples/echo_get/src/echo_get.erl
new file mode 100644
index 0000000..81d0f43
--- /dev/null
+++ b/examples/echo_get/src/echo_get.erl
@@ -0,0 +1,12 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+-module(echo_get).
+
+%% API.
+-export([start/0]).
+
+%% API.
+
+start() ->
+	ok = application:start(cowboy),
+	ok = application:start(echo_get).
diff --git a/examples/echo_get/src/echo_get_app.erl b/examples/echo_get/src/echo_get_app.erl
new file mode 100644
index 0000000..8220bd3
--- /dev/null
+++ b/examples/echo_get/src/echo_get_app.erl
@@ -0,0 +1,26 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+%% @private
+-module(echo_get_app).
+-behaviour(application).
+
+%% API.
+-export([start/2]).
+-export([stop/1]).
+
+%% API.
+
+start(_Type, _Args) ->
+	Dispatch = [
+		{'_', [
+			{[], toppage_handler, []}
+		]}
+	],
+	{ok, _} = cowboy:start_listener(http, 100,
+		cowboy_tcp_transport, [{port, 8080}],
+		cowboy_http_protocol, [{dispatch, Dispatch}]
+	),
+	echo_get_sup:start_link().
+
+stop(_State) ->
+	ok.
diff --git a/examples/echo_get/src/echo_get_sup.erl b/examples/echo_get/src/echo_get_sup.erl
new file mode 100644
index 0000000..455af04
--- /dev/null
+++ b/examples/echo_get/src/echo_get_sup.erl
@@ -0,0 +1,23 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+%% @private
+-module(echo_get_sup).
+-behaviour(supervisor).
+
+%% API.
+-export([start_link/0]).
+
+%% supervisor.
+-export([init/1]).
+
+%% API.
+
+-spec start_link() -> {ok, pid()}.
+start_link() ->
+	supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+
+%% supervisor.
+
+init([]) ->
+	Procs = [],
+	{ok, {{one_for_one, 10, 10}, Procs}}.
diff --git a/examples/echo_get/src/toppage_handler.erl b/examples/echo_get/src/toppage_handler.erl
new file mode 100644
index 0000000..1322449
--- /dev/null
+++ b/examples/echo_get/src/toppage_handler.erl
@@ -0,0 +1,29 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+%% @doc GET echo handler.
+-module(toppage_handler).
+
+-export([init/3]).
+-export([handle/2]).
+-export([terminate/2]).
+
+init(_Transport, Req, []) ->
+	{ok, Req, undefined}.
+
+handle(Req, State) ->
+	{Method, Req2} = cowboy_http_req:method(Req),
+	{Echo, Req3} = cowboy_http_req:qs_val(<<"echo">>, Req2),
+	{ok, Req4} = echo(Method, Echo, Req3),
+	{ok, Req4, State}.
+
+echo('GET', undefined, Req) ->
+	cowboy_http_req:reply(400, [], <<"Missing echo parameter.">>, Req);
+echo('GET', Echo, Req) ->
+	cowboy_http_req:reply(200,
+		[{<<"Content-Encoding">>, <<"utf-8">>}], Echo, Req);
+echo(_, _, Req) ->
+	%% Method not allowed.
+	cowboy_http_req:reply(405, Req).
+
+terminate(_Req, _State) ->
+	ok.
diff --git a/examples/echo_get/start.sh b/examples/echo_get/start.sh
new file mode 100755
index 0000000..4704feb
--- /dev/null
+++ b/examples/echo_get/start.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+erl -pa ebin deps/*/ebin -s echo_get \
+	-eval "io:format(\"Point your browser at http://localhost:8080/?echo=test~n\")."
-- 
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