321 lines
9.0 KiB
Ruby
321 lines
9.0 KiB
Ruby
# frozen_string_literal: true
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module DiscourseAi
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module AiBot
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class Bot
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class Functions
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attr_reader :functions
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attr_reader :current_function
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def initialize
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@functions = []
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@current_function = nil
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end
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def add_function(name)
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@current_function = { name: name, arguments: +"" }
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functions << current_function
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end
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def add_argument_fragment(fragment)
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@current_function[:arguments] << fragment
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end
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end
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attr_reader :bot_user
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BOT_NOT_FOUND = Class.new(StandardError)
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MAX_COMPLETIONS = 6
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def self.as(bot_user)
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available_bots = [DiscourseAi::AiBot::OpenAiBot, DiscourseAi::AiBot::AnthropicBot]
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bot =
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available_bots.detect(-> { raise BOT_NOT_FOUND }) do |bot_klass|
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bot_klass.can_reply_as?(bot_user)
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end
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bot.new(bot_user)
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end
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def initialize(bot_user)
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@bot_user = bot_user
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end
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def update_pm_title(post)
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prompt = title_prompt(post)
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new_title = get_updated_title(prompt)
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PostRevisor.new(post.topic.first_post, post.topic).revise!(
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bot_user,
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title: new_title.sub(/\A"/, "").sub(/"\Z/, ""),
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)
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end
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def max_commands_per_reply=(val)
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@max_commands_per_reply = val
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end
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def max_commands_per_reply
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@max_commands_per_reply || 5
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end
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def reply_to(
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post,
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total_completions: 0,
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bot_reply_post: nil,
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prefer_low_cost: false,
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standalone: false
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)
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return if total_completions > MAX_COMPLETIONS
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prompt =
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if standalone && post.post_custom_prompt
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username, standalone_prompt = post.post_custom_prompt.custom_prompt.last
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[build_message(username, standalone_prompt)]
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else
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bot_prompt_with_topic_context(post)
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end
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redis_stream_key = nil
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partial_reply = +""
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reply = +(bot_reply_post ? bot_reply_post.raw.dup : "")
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start = Time.now
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setup_cancel = false
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context = {}
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functions = Functions.new
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submit_prompt(prompt, prefer_low_cost: prefer_low_cost) do |partial, cancel|
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current_delta = get_delta(partial, context)
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partial_reply << current_delta
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reply << current_delta
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populate_functions(partial, functions)
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if redis_stream_key && !Discourse.redis.get(redis_stream_key)
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cancel&.call
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bot_reply_post.update!(raw: reply, cooked: PrettyText.cook(reply)) if bot_reply_post
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end
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next if reply.length < SiteSetting.min_personal_message_post_length
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# Minor hack to skip the delay during tests.
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next if (Time.now - start < 0.5) && !Rails.env.test?
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if bot_reply_post
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Discourse.redis.expire(redis_stream_key, 60)
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start = Time.now
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publish_update(bot_reply_post, raw: reply.dup)
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else
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bot_reply_post =
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PostCreator.create!(
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bot_user,
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topic_id: post.topic_id,
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raw: reply,
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skip_validations: false,
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)
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end
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if !setup_cancel && bot_reply_post
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redis_stream_key = "gpt_cancel:#{bot_reply_post.id}"
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Discourse.redis.setex(redis_stream_key, 60, 1)
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setup_cancel = true
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end
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end
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if bot_reply_post
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publish_update(bot_reply_post, done: true)
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bot_reply_post.revise(
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bot_user,
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{ raw: reply },
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skip_validations: true,
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skip_revision: true,
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)
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bot_reply_post.post_custom_prompt ||= post.build_post_custom_prompt(custom_prompt: [])
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prompt = post.post_custom_prompt.custom_prompt || []
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prompt << [partial_reply, bot_user.username]
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post.post_custom_prompt.update!(custom_prompt: prompt)
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end
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if functions.functions.length > 0
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chain = false
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standalone = false
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functions.functions.each do |function|
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name, args = function[:name], function[:arguments]
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if command_klass = available_commands.detect { |cmd| cmd.invoked?(name) }
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command =
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command_klass.new(
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bot_user: bot_user,
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args: args,
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post: bot_reply_post,
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parent_post: post,
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)
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chain_intermediate, bot_reply_post = command.invoke!
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chain ||= chain_intermediate
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standalone ||= command.standalone?
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end
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end
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if chain
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reply_to(
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bot_reply_post,
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total_completions: total_completions + 1,
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bot_reply_post: bot_reply_post,
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standalone: standalone,
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)
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end
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end
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rescue => e
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if Rails.env.development?
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p e
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puts e.backtrace
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end
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raise e if Rails.env.test?
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Discourse.warn_exception(e, message: "ai-bot: Reply failed")
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end
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def bot_prompt_with_topic_context(post, prompt: "topic")
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messages = []
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conversation = conversation_context(post)
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rendered_system_prompt = system_prompt(post)
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total_prompt_tokens = tokenize(rendered_system_prompt).length
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messages =
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conversation.reduce([]) do |memo, (raw, username, function)|
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break(memo) if total_prompt_tokens >= prompt_limit
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tokens = tokenize(raw.to_s)
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while !raw.blank? && tokens.length + total_prompt_tokens > prompt_limit
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raw = raw[0..-100] || ""
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tokens = tokenize(raw.to_s)
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end
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next(memo) if raw.blank?
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total_prompt_tokens += tokens.length
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memo.unshift(build_message(username, raw, function: !!function))
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end
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messages.unshift(build_message(bot_user.username, rendered_system_prompt, system: true))
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messages
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end
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def prompt_limit
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raise NotImplemented
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end
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def title_prompt(post)
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[build_message(bot_user.username, <<~TEXT)]
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Suggest a 7 word title for the following topic without quoting any of it:
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#{post.topic.posts[1..-1].map(&:raw).join("\n\n")[0..prompt_limit]}
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TEXT
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end
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def available_commands
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# by default assume bots have no access to commands
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# for now we need GPT 4 to properly work with them
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[]
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end
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def system_prompt_style!(style)
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@style = style
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end
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def system_prompt(post)
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return "You are a helpful Bot" if @style == :simple
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<<~TEXT
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You are a helpful Discourse assistant.
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You understand and generate Discourse Markdown.
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You live in a Discourse Forum Message.
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You live in the forum with the URL: #{Discourse.base_url}
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The title of your site: #{SiteSetting.title}
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The description is: #{SiteSetting.site_description}
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The participants in this conversation are: #{post.topic.allowed_users.map(&:username).join(", ")}
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The date now is: #{Time.zone.now}, much has changed since you were trained.
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#{available_commands.map(&:custom_system_message).compact.join("\n")}
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TEXT
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end
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def tokenize(text)
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raise NotImplemented
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end
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def submit_prompt(prompt, prefer_low_cost: false, &blk)
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raise NotImplemented
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end
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def get_delta(partial, context)
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raise NotImplemented
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end
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def populate_functions(partial, functions)
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raise NotImplemented
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end
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protected
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def get_updated_title(prompt)
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raise NotImplemented
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end
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def model_for(bot)
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raise NotImplemented
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end
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def conversation_context(post)
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context =
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post
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.topic
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.posts
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.includes(:user)
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.joins("LEFT JOIN post_custom_prompts ON post_custom_prompts.post_id = posts.id")
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.where("post_number <= ?", post.post_number)
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.order("post_number desc")
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.where("post_type = ?", Post.types[:regular])
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.limit(50)
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.pluck(:raw, :username, "post_custom_prompts.custom_prompt")
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result = []
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first = true
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context.each do |raw, username, custom_prompt|
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if custom_prompt.present?
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if first
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custom_prompt.reverse_each { |message| result << message }
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first = false
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else
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result << custom_prompt.first
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end
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else
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result << [raw, username]
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end
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end
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result
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end
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def publish_update(bot_reply_post, payload)
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MessageBus.publish(
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"discourse-ai/ai-bot/topic/#{bot_reply_post.topic_id}",
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payload.merge(post_id: bot_reply_post.id, post_number: bot_reply_post.post_number),
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user_ids: bot_reply_post.topic.allowed_user_ids,
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)
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end
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end
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end
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end
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