{
title: "Test `nginx.conf` Directives (subtitle: With MoonScript, OpenResty,
and Busted)"
}
$index
## Introduction
We'll need nginx and luarocks. Buildpack has luarocks installed.
```console
$ docker pull openresty/openresty:bookworm-buildpack
```
Start a server on `localhost`:
```console
$ docker run --rm -it -p 80:80 openresty/openresty:bookworm-buildpack
```
Visit `localhost` in browser. Should see OpenResty splash page.
[Prepare directory layout](ehttps://openresty.org/en/getting-started.html#prepare-directory-layout)
```console
$ mkdir -p logs/ conf/conf.d/ html/
```
[Copy config file](https://github.com/openresty/docker-openresty?tab=readme-ov-file#nginx-config-files)
```console
$ docker run --rm -it -w /opt -v $PWD:/opt openresty/openresty:bookworm-buildpack \
cp /etc/nginx/conf.d/default.conf /opt/conf.d/
```
edit default.conf
change `root /usr/local/openresty/nginx/html;` to:
root /var/www;
`html/index.html`
```html
hello world!
```
Start nginx:
```console
$ docker run --rm -it -p 80:80 \
-v $PWD/conf/conf.d:/etc/nginx/conf.d -v $PWD/html:/var/www \
openresty/openresty:bookworm-buildpack
```
Then, in another console:
```console
$ curl -v localhost
* Trying 127.0.0.1:80...
* Connected to localhost (127.0.0.1) port 80 (#0)
> GET / HTTP/1.1
> Host: localhost
> User-Agent: curl/7.88.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: openresty/1.27.1.2
< ...
<
...
hello world!
```
If we wanted to write a test for that, we need some packages from `luarocks`.
`Dockerfile`
```Dockerfile
FROM openresty/openresty:bookworm-buildpack
WORKDIR /opt/app
# needed for testing
RUN luarocks install busted
RUN luarocks install luajit-curl
RUN luarocks install luasocket # needed for testing nginx reverse proxy
```
```console
$ docker build -t test-nginx .
$ mkdir spec
```
`spec/nginx_spec.moon`
```moonscript
http = require "luajit-curl-helper.http"
req = (url) ->
request = http.init url
st = request\perform!
error request\lastError! if not st
request
describe "http://localhost", ->
it "sends /index.html", ->
request = req "http://localhost"
assert.same request\statusCode!, 200
assert.same request\statusMessage!, "OK"
assert.same request\body!\match("%s+(.-)%s+"), "hello world!"
```
Start the test server:
```console
$ ct=$(docker run --rm -d \
-v $PWD/conf/conf.d:/etc/nginx/conf.d \
-v $PWD/html:/var/www \
-v $PWD:/opt/app \
test-nginx)
```
Run the tests.
```console
$ docker exec -t $ct busted
●
1 success / 0 failures / 0 errors / 0 pending : 0.008246 seconds
```
Stop the test server.
```console
$ docker exec -t $ct openresty -s stop
```
## Edit hosts
Instead of `localhost` we'd like to use an actual domain name. We can do this
with the `--add-host` option. But before we do that, we want to make sure our
container does not have access to the internet, otherwise we might
unintentionally get a response from a domain's server on the internet rather
than from our test server.
```console
$ docker network create --internal no-internet
```
Now we can start the test server with our host:
```console
$ ct=$(docker run --rm -d \
-v $PWD/conf/conf.d:/etc/nginx/conf.d \
-v $PWD/html:/var/www \
-v $PWD:/opt/app \
--network no-internet \
--add-host=domain.abc=127.0.0.1 \
test-nginx)
```
Update our test
request = req "http://localhost"
to
request = req "http://domain.abc"
Run the tests.
```console
$ docker exec -t $ct busted
●
1 success / 0 failures / 0 errors / 0 pending : 0.008246 seconds
```
Stop the test server.
```console
$ docker exec -t $ct openresty -s stop
```
## Add a test to make sure the test server is offline
```moonscript
describe "test environment", ->
it "can't connect to the internet", ->
assert.has_error (-> req "http://example.org"),
"Couldn't resolve host name"
```
## Create a Makefile
Let's create a `Makefile` to make running all these commands easier.
`Makefile`
```Makefile
image = test-nginx
loopback = 127.0.0.1
image-build:
docker build -t $(image) .
image-rm:
docker image rm $(image)
test:
@ct=$(shell docker run --rm -d \
-v $(PWD)/conf/conf.d:/etc/nginx/conf.d \
-v $(PWD)/html:/var/www \
-v $(PWD):/opt/app \
--network no-internet \
--add-host=domain.abc=$(loopback) \
$(image)); \
docker exec -t $$ct busted; \
docker exec $$ct openresty -s stop
```
Now we can run tests by running `make test`.
```console
$ make test
●●
2 successes / 0 failures / 0 errors / 0 pending : 0.008812 seconds
```
## SSL
We want our server to redirect all `http` requests to `https`.
Our test:
```moonscript
describe "http://domain.abc", ->
it "redirects to https", ->
request = req "http://domain.abc"
assert.same request\statusCode!, 301
assert.same request\statusMessage!, "Moved Permanently"
assert.same request\header!.Location, "https://domain.abc/"
```
```console
$ make test
●●◼
2 successes / 1 failure / 0 errors / 0 pending : 0.010449 seconds
Failure → .../luajit/lib/luarocks/rocks-5.1/busted/2.2.0-1/bin/busted @ 3
http://domain.abc redirects to https
spec/nginx_spec.moon:24: Expected objects to be the same.
Passed in:
(number) 301
Expected:
(number) 200
```
Make self-signed certs in Dockerfile:
```Dockerfile
RUN openssl req -x509 -newkey rsa:4096 -nodes \
-keyout /etc/ssl/private/domain.abc.pem \
-out /etc/ssl/certs/domain.abc.pem \
-sha256 -days 365 -subj '/CN=domain.abc' \
-addext "subjectAltName=DNS:domain.abc"
```
Edit `default.conf`:
```
server {
listen 80;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl;
server_name domain.abc;
ssl_certificate /etc/ssl/certs/domain.abc.pem;
ssl_certificate_key /etc/ssl/private/domain.abc.pem;
```
Rebuild the image:
```console
$ make image-rm image-build
```
Run tests:
```console
$ make test
●◼●
2 successes / 1 failure / 0 errors / 0 pending : 0.009618 seconds
Failure → .../luajit/lib/luarocks/rocks-5.1/busted/2.2.0-1/bin/busted @ 3
http://domain.abc sends /index.html
spec/nginx_spec.moon:17: Expected objects to be the same.
Passed in:
(number) 200
Expected:
(number) 301
```
Fix test:
```moonscript
describe "https://domain.abc", ->
it "sends /index.html", ->
request = req "https://domain.abc"
```
Run tests:
```console
$ make test
●●●
3 successes / 0 failures / 0 errors / 0 pending : 0.017065 seconds
```
## Reverse proxy a subdomain to a unix socket
Add to `default.conf`:
```
server {
listen 443 ssl;
server_name git.domain.abc;
location / {
client_max_body_size 1024M;
proxy_pass http://unix:/run/gitea/gitea.socket;
proxy_set_header Connection $http_connection;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
```
Add subdomain to certs in Dockerfile:
```
-addext "subjectAltName=DNS:domain.abc,DNS:git.domain.abc"
```
Add a test socket server (copied and modified from [here](https://github.com/lunarmodules/luasocket/blob/4844a48fbf76b0400fd7b7e4d15d244484019df1/test/unixstreamsrvr.lua)):
::: filename-for-code-block
`spec/unixstreamsrvr.moon`
:::
```moonscript
socket = require "socket"
socket.unix = require "socket.unix"
u = assert socket.unix.stream!
assert u\bind "/run/gitea/gitea.socket"
assert u\listen!
assert u\settimeout 1
c = assert u\accept!
while true
m = assert c\receive!
break if m == ""
print m
```
Add a spec:
```moonscript
describe "https://git.domain.abc", ->
it "reverse-proxy's request to a gitea unix socket", ->
socket = fname: "unixstreamsrvr.moon", dir: "/run/gitea", owner: "nobody"
basepath = debug.getinfo(1).short_src\match"^(.*)/[^/]*$" or "."
seconds = 0.1
os.execute "install -o #{socket.owner} -d #{socket.dir}"
cmd = "su -s /bin/bash -c 'moon %s' %s"
server = io.popen cmd\format "#{basepath}/#{socket.fname}", socket.owner
os.execute "sleep #{seconds}" -- wait for server to start
f = io.popen "find #{socket.dir} -type s -ls", "r"
result = with f\read "*a"
f\close!
assert.truthy result\match "nobody%s+nogroup.+#{socket.dir}/gitea.socket"
req "https://git.domain.abc"
reqheader = with server\read "*a"
server\close!
assert.truthy reqheader\match "Host: git.domain.abc"
```
Edit Makefile:
--add-host=git.domain.abc=$(loopback) \
Rebuild image:
```console
$ make image-rm image-build
```
Run tests:
```console
$ make test
●●●●
4 successes / 0 failures / 0 errors / 0 pending : 0.131619 seconds
```
## Conclusion
## Bonus!: Issues We Ran Into Just Trying To Make This Post
1. `$host$request_uri`
`renderers/markdown.moon`
```moonscript
dollar_temp = "0000sitegen_markdown00dollar0000"
```
So, when two cosmo selectors had no space between them, it was ambiguous
to which selector the numbers belonged.
```
0000sitegen_markdown00dollar0000.10000sitegen_markdown00dollar0000.2
```
Solution was to change the first `0` to a letter `z`:
```
z000sitegen_markdown00dollar0000.1z000sitegen_markdown00dollar0000.2
```
Because `dollar_temp` is a private attribute, I had to copy every function
from the sitegen markdown renderer. Which makes my renderer a copy with
some additions.
2. `$$ct`