Adding docker support (#4)

* Added docker support
* Documenting docker usage
* Add docker hub option to README

Co-authored-by: Richard Szolár <r@richardszolar.me>

.gitignore

@@ -11,4 +11,5 @@
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
-bot-config.json
+bot-config.json
+.idea

Dockerfile

@@ -0,0 +1,12 @@
+FROM golang:1.14-buster
+
+CMD /bin/init.sh /bin/rss-bot
+
+COPY . /code
+
+WORKDIR /code
+
+RUN go get ./...
+
+RUN make gh_linux_amd64
+RUN chmod -R g+rwx /code && cp build/telegram-rss-bot-linux-amd64 /bin/rss-bot && cp init.sh /bin

README.md

@@ -43,6 +43,24 @@ You can put the config file in the current folder on where the binary resides or
 - feed_updates_interval: this represents the interval at which rate the feeds saved in the database should be updated in seconds (60 = 60 seconds and so on)
 - feed_posts_interval: this represents the interval at which rate the feeds should be posted to their respective channels in seconds (60 = 60 seconds and so on)
 
+## Docker support
+You can also run this application as a docker container.
+
+### Docker hub
+
+You can pull the official docker image
+```bash
+docker pull ruthless/telegram-rss-bot
+```
+
+### Build from source
+Execute the following steps:
+```
+git clone https://github.com/0x111/telegram-rss-bot
+docker build -t telegram-rss-bot:latest .
+docker run --name telegram-rss-bot -e TELEGRAM_AUTH_KEY="MY-TOKEN" -d telegram-rss-bot:latest
+```
+
 ## Important
 Advisory: You should respect the rate limiting of the Telegram API (More info about this: https://core.telegram.org/bots/faq#my-bot-is-hitting-limits-how-do-i-avoid-this)
 

bot-config.template.json

@@ -0,0 +1,11 @@
+{
+  "telegram_auth_key": "TELEGRAM_AUTH_KEY",
+  "migrations": "MIGRATIONS",
+  "telegram_api_debug": TELEGRAM_API_DEBUG,
+  "db_path": "DB_PATH",
+  "log_level": "LOG_LEVEL",
+  "feed_parse_amount": FEED_PARSE_AMOUNT,
+  "feed_post_amount": FEED_POST_AMOUNT,
+  "feed_updates_interval": FEED_UPDATES_INTERVAL,
+  "feed_posts_interval": FEED_POST_INTERVAL
+}

conf/conf.go

@@ -17,6 +17,7 @@ func LoadConfig() {
 	viper.SetConfigName("bot-config")
 	viper.AddConfigPath("$HOME/.telegram-rss-bot")
 	viper.AddConfigPath(".")
+	viper.AddConfigPath("./.telegram-rss-bot")
 	err := viper.ReadInConfig()
 
 	if err != nil {

init.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -ue
+
+keys="TELEGRAM_AUTH_KEY MIGRATIONS TELEGRAM_API_DEBUG DB_PATH LOG_LEVEL FEED_PARSE_AMOUNT FEED_POST_AMOUNT FEED_UPDATES_INTERVAL FEED_POST_INTERVAL"
+
+TELEGRAM_AUTH_KEY=${TELEGRAM_AUTH_KEY:=token}
+MIGRATIONS=${MIGRATIONS:=v1}
+TELEGRAM_API_DEBUG=${TELEGRAM_API_DEBUG:=false}
+DB_PATH=${DB_PATH:=./bot.db}
+LOG_LEVEL=${LOG_LEVEL:=info}
+FEED_PARSE_AMOUNT=${FEED_PARSE_AMOUNT:=5}
+FEED_POST_AMOUNT=${FEED_POST_AMOUNT:=2}
+FEED_UPDATES_INTERVAL=${FEED_UPDATES_INTERVAL:=600}
+FEED_POST_INTERVAL=${FEED_POST_INTERVAL:=400}
+
+mkdir -p /code/.telegram-rss-bot
+cp ./bot-config.template.json /code/.telegram-rss-bot/bot-config.json
+
+for key in $keys; do
+  sed -i "s|$key|$(eval echo "\$${key}")|g" /code/.telegram-rss-bot/bot-config.json
+done
+
+echo Executing $*
+$*