sum message reactions on Slack

sum_message_reactions_on_slack.rb

require 'slack'

Slack.configure do |config|
    config.token = ENV['SLACK_TOKEN']
end

def getChannelHistory(client, latest, oldest)
    client.channels_history(channel: ENV['CHANNEL_ID'], latest: latest, oldest: oldest, inclusive: true, count: 1000)
end

client = Slack::Client.new

latest = ENV['LATEST_TS']
oldest = ENV['OLDEST_TS']

history = getChannelHistory(client, latest, oldest)
if history.has_key?("has_more") && history["has_more"] then
    puts "Don't support more messages"
    return
end
messages = history["messages"]

sum_reactions = {}
messages.each do |message|
    next unless message.has_key?("reactions")
    message["reactions"].each do |reaction|
        reaction_name = reaction["name"]
        if sum_reactions.has_key?(reaction_name) then
            sum_reactions[reaction_name] += 1
        else
            sum_reactions[reaction_name] = 1
        end
    end
end 

message = ""
i = 0
sum_reactions.sort { |(k1, v1), (k2, v2)| v2 <=> v1 }.each { |(key, value)| 
    i += 1
    message += "#{i}. :#{key}: #{value}\n" 
}
message += "#{messages.count} messages was analyzed.\n"
client.chat_postMessage(channel: ENV["POST_CHANNEL_NAME_TO_MESSAGE"], text: message, as_user: true)