站長最近需要用到 Discord dispatch 因此使用 Docker 跑 Ubuntu 18.04 寫了以下的腳本
Ubuntu 18.04 與 Discord dispatch Dockerfile
FROM ubuntu:18.04 RUN apt-get install -y wget \ && rm -rf /var/lib/apt/lists/* \ && wget -O /bin/dispatch https://dl-dispatch.discordapp.net/download/linux \ && chmod +x /bin/dispatch
主要是下載 Discord dispatch 並且把它設定成可以直接呼叫的指令，不過使用後遇到以下錯誤
dispatch 指令錯誤
dispatch v1.0.0-rc3-d42fde1 thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:347:21 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
這時候在參數加上 RUST_BACKTRACE=1 看了一下噴出來的訊息
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:347:21
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at ./cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at ./cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:47
3: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:36
4: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:198
5: std::panicking::default_hook
at src/libstd/panicking.rs:212
6: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:475
7: std::panicking::continue_panic_fmt
at src/libstd/panicking.rs:382
8: rust_begin_unwind
at src/libstd/panicking.rs:309
9: core::panicking::panic_fmt
at src/libcore/panicking.rs:85
10: core::panicking::panic
at src/libcore/panicking.rs:49
11: openssl::ssl::connector::ctx
12: openssl::ssl::connector::SslConnectorBuilder::new
13: native_tls::TlsConnector::builder
14: reqwest::async_impl::client::ClientBuilder::new
15: reqwest::client::ClientBuilder::new
16: dispatch::credentials::make_client
17: dispatch::credentials::create
18: dispatch_cli::cmd::login::exec
19: dispatch_cli::cmd::exec
20: dispatch::main
21: std::rt::lang_start::{{closure}}
22: std::rt::lang_start_internal::{{closure}}
at src/libstd/rt.rs:49
23: std::panicking::try::do_call
at src/libstd/panicking.rs:294
24: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:85
25: std::panicking::try
at src/libstd/panicking.rs:273
26: std::panic::catch_unwind
at src/libstd/panic.rs:388
27: std::rt::lang_start_internal
at src/libstd/rt.rs:48
28: main
29: __libc_start_main
30: _start
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
爬了一下文翻到了 issue 與 issue，簡單來說問題出在目前系統的 OpenSSL 版本是 1.1.1，沒辦法使用需要降版到 1.1.0，這時候我就去看了一下系統的 OpenSSL 版本
openssl version -a OpenSSL 1.1.1 11 Sep 2018 built on: Tue Nov 12 16:58:35 2019 UTC
看起來真的只能降版了，所以我就把原本的 Dockerfile 做一點更新讓它可以使用 1.1.0
編譯 OpenSSL 1.1.0
apt install -y build-essential checkinstall zlib1g-dev curl #安裝必要套件
curl https://www.openssl.org/source/openssl-1.1.0l.tar.gz -o openssl-1.1.0l.tar.gz #下載 openssl
sha256sum openssl-1.1.0l.tar.gz | grep 74a2f756c64fd7386a29184dc0344f4831192d61dc2481a93a4c5dd727f41148 #檢查 checksum
tar -xf openssl-1.1.0l.tar.gz #解壓縮 openssl
./config --prefix=/usr/local/ssl --openssldir=/usr/local/ssl shared zlib && \
make && \
make test && \
make install #編譯與跑測試
echo "/usr/local/ssl/lib" > openssl-${VERSION}.conf && \
ldconfig -v #設定索引路徑
以上對於 Dockerfile 的步驟做一點解釋
結論
此篇主要簡單介紹 OpenSSL 編譯與找出 Discord dispatch 的問題，如果只是需要使用 Discord dispatch 的朋友可以直接使用我的 docker hub 下載回去使用就可以了喔！
docker run -ti clarencetw/discord-dispatch:latest
將 dispatch 設定檔放入對應位置，記得修改 application_id 與 token
root:~# mkdir /root/.dispatch
root:~# echo "{\"BotCredentials\":{\"application_id\":\"111111111111111111\",\"token\":\"111111111111111111\"}}" > /root/.dispatch/credentials.json
測試 dispatch login
root:~# dispatch login dispatch v1.0.0-rc3-d42fde1 [2020-00-00][00:00:00][INFO] Already logged in
如果有問題歡迎在下面留言！