V言語でWeb Serverを立てる（失敗）

[前回](https://qiita.com/nekijak/items/ded6977d6a42f0cc7384)の続き

## 導入

前回とほぼ一緒ですが、コンパイル方法が少し変わっています。
compilerフォルダが無くなっています。


```shell-session
kajiken@kajiken:~$ docker run --rm -it ubuntu
root@5ec2d954e645:/# apt-get update
root@5ec2d954e645:/# apt-get install vim git make curl gcc -y
root@5ec2d954e645:/#
root@5ec2d954e645:/# git clone https://github.com/vlang/v
root@5ec2d954e645:/# cd v
root@5ec2d954e645:/v# make
rm -rf vc/
git clone --depth 1 --quiet https://github.com/vlang/vc
#cp fns.h vc/fns.h
rm -rf /var/tmp/tcc/
git clone --depth 1 --quiet https://github.com/vlang/tccbin /var/tmp/tcc
cc -std=gnu11 -w -o v vc/v.c  -lm
rm -rf vc/
V has been successfully built
root@5ec2d954e645:/v# ln -s /v/v /usr/local/bin/v
root@5ec2d954e645:/v# cd
root@5ec2d954e645:~#
root@5ec2d954e645:~# echo println\(\'Hello World\'\) > hello.v
root@5ec2d954e645:~# v hello.v 
root@5ec2d954e645:~# ll hello
-rwxr-xr-x 1 root root 67920 Nov 11 0:15 hello*
root@5ec2d954e645:~# ./hello 
Hello World
root@5ec2d954e645:~# v run hello.v 
Hello World
root@5ec2d954e645:~# v --version
V 0.1.22 730ef96
root@5ec2d954e645:~#
```

## Web Serverを立てる？

さて前回はまだ未実装だった`Powerful built-in web framework`を使ってみましょう。
ただ、まだプレアルファ版らしいです。

まずは公式サイトにある以下から。

> Powerful built-in web framework
>
```golang
['/post/:id']
fn (b Blog) show_post(id int) vweb.Result {
  post := b.posts_repo.retrieve(id) or {
     return vweb.not_found()
  }
  return vweb.view(post)
}
```

openssl/ssl.hが無いと言われたので`apt-get install libssl-dev -y`で入れてやる。

```
root@ed72e8337897:/# v run web.v 
warning: web.v:1:6: the following imports were never used: 
 * vweb
/web.tmp.c:175:10: fatal error: openssl/ssl.h: No such file or directory
 #include <openssl/ssl.h>
          ^~~~~~~~~~~~~~~
compilation terminated.
V error: C error. This should never happen. 
Please create a GitHub issue: https://github.com/vlang/v/issues/new/choose
root@ed72e8337897:/#
root@ed72e8337897:/# apt-get install libssl-dev -y
```

再チャレ。

```shell-session
root@ed72e8337897:/# v web.v 
check()
next token = `]`
web.v:3:13: expected `name` but got `'/post/:id'`
    1| import vweb
    2| 
    3| ['/post/:id']
                   ^
    4| fn (b Blog) show_post(id int) vweb.Result {
    5|   post := b.posts_repo.retrieve(id) or {
root@ed72e8337897:/#
```

ふぁっ！？
ちょっとまって、え、まって。

…アノテーションもどきな`['/post/:id']`はまだ使えなさそう。
[vorum](https://github.com/vlang/vorum/blob/master/main.v)のソースを見るとTODOコメントになっている。


気を取り直してvorumを真似てみる。

```golang:web.v
import vweb

struct App {
}

fn main() {
  mut app := App{}
  vweb.run(app, 8092)
}
```

```shell-session
root@ed72e8337897:~# v web.v 
check()
next token = `eof`
V panic: array.get: index out of range (i == 429, a.len == 27)
addr2line: 'v': No such file
v(+0x35f5) [0x55fd6829b5f5]
addr2line: 'v': No such file
v(+0x2300) [0x55fd6829a300]
addr2line: 'v': No such file
v(+0x168e2) [0x55fd682ae8e2]
addr2line: 'v': No such file
v(+0x16804) [0x55fd682ae804]
addr2line: 'v': No such file
v(+0x43ae9) [0x55fd682dbae9]
addr2line: 'v': No such file
v(+0x44ff9) [0x55fd682dcff9]
addr2line: 'v': No such file
v(+0x44e7a) [0x55fd682dce7a]
addr2line: 'v': No such file
v(+0x2bd9a) [0x55fd682c3d9a]
addr2line: 'v': No such file
v(+0x282ca) [0x55fd682c02ca]
addr2line: 'v': No such file
v(+0x255a9) [0x55fd682bd5a9]
addr2line: 'v': No such file
v(+0x1e1ba) [0x55fd682b61ba]
addr2line: 'v': No such file
v(+0x20053) [0x55fd682b8053]
addr2line: 'v': No such file
v(+0x1fa9b) [0x55fd682b7a9b]
addr2line: 'v': No such file
v(+0x1f362) [0x55fd682b7362]
addr2line: 'v': No such file
v(+0x4bb24) [0x55fd682e3b24]
addr2line: 'v': No such file
v(+0x1e504) [0x55fd682b6504]
addr2line: 'v': No such file
v(+0x1c73d) [0x55fd682b473d]
addr2line: 'v': No such file
v(+0x1c455) [0x55fd682b4455]
addr2line: 'v': No such file
v(+0x45887) [0x55fd682dd887]
addr2line: 'v': No such file
v(+0x44f39) [0x55fd682dcf39]
addr2line: 'v': No such file
v(+0x23a7d) [0x55fd682bba7d]
addr2line: 'v': No such file
v(+0x4197d) [0x55fd682d997d]
addr2line: 'v': No such file
v(+0x343db) [0x55fd682cc3db]
addr2line: 'v': No such file
v(+0x34a30) [0x55fd682cca30]
addr2line: 'v': No such file
v(+0x677f7) [0x55fd682ff7f7]
addr2line: 'v': No such file
v(+0x68ff9) [0x55fd68300ff9]
??:0:                                         | /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f53b60a0b97]
addr2line: 'v': No such file
v(+0x193a) [0x55fd6829993a]
root@ed72e8337897:~#
```

…なんじゃこりゃあ。


落ち着け、まだ慌てるような時間ではない。
動いているやつがあるならそれを動かせば良いではないか。

```shell-session
root@ed72e8337897:/# git clone https://github.com/vlang/vorum
root@ed72e8337897:/# cd vorum/
root@ed72e8337897:/vorum# v .
check()
next token = `$`
./_user.v:12:12: expected `name` but got `'
                select name from users 
                where id='`
   10|  users := app.db.exec_param('
   11|          select name from users 
   12|          where id=$user_id and random_id=$1', random_id)
                           ^
   13|  if users.len == 0 {
   14|          return error('no such user "$user_id" r="$random_id"')
root@ed72e8337897:/vorum#
```

なんですと！？

## オチ

https://github.com/vlang/vorum/issues/9
v 0.1.19から動かない…っておーい！

もう少し暖かく見守ろう。