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https://github.com/discourse/discourse-ai.git
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This PR adds tool support to available LLMs. We'll buffer tool invocations and return them instead of making users of this service parse the response. It also adds support for conversation context in the generic prompt. It includes bot messages, user messages, and tool invocations, which we'll trim to make sure it doesn't exceed the prompt limit, then translate them to the correct dialect. Finally, It adds some buffering when reading chunks to handle cases when streaming is extremely slow.:M
95 lines
2.7 KiB
Ruby
95 lines
2.7 KiB
Ruby
# frozen_string_literal: true
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require "aws-sigv4"
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module DiscourseAi
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module Completions
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module Endpoints
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class AwsBedrock < Base
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def self.can_contact?(model_name)
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%w[claude-instant-1 claude-2].include?(model_name) &&
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SiteSetting.ai_bedrock_access_key_id.present? &&
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SiteSetting.ai_bedrock_secret_access_key.present? &&
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SiteSetting.ai_bedrock_region.present?
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end
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def default_options
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{ max_tokens_to_sample: 2_000 }
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end
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def provider_id
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AiApiAuditLog::Provider::Anthropic
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end
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private
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def model_uri
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# Bedrock uses slightly different names
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bedrock_model_id = model.split("-")
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bedrock_model_id[-1] = "v#{bedrock_model_id.last}"
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bedrock_model_id = bedrock_model_id.join("-")
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api_url =
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"https://bedrock-runtime.#{SiteSetting.ai_bedrock_region}.amazonaws.com/model/anthropic.#{bedrock_model_id}/invoke"
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api_url = @streaming_mode ? (api_url + "-with-response-stream") : api_url
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URI(api_url)
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end
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def prepare_payload(prompt, model_params, _dialect)
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default_options.merge(prompt: prompt).merge(model_params)
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end
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def prepare_request(payload)
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headers = { "content-type" => "application/json", "Accept" => "*/*" }
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signer =
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Aws::Sigv4::Signer.new(
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access_key_id: SiteSetting.ai_bedrock_access_key_id,
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region: SiteSetting.ai_bedrock_region,
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secret_access_key: SiteSetting.ai_bedrock_secret_access_key,
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service: "bedrock",
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)
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Net::HTTP::Post
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.new(model_uri)
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.tap do |r|
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r.body = payload
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signed_request =
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signer.sign_request(req: r, http_method: r.method, url: model_uri, body: r.body)
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r.initialize_http_header(headers.merge(signed_request.headers))
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end
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end
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def decode(chunk)
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Aws::EventStream::Decoder
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.new
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.decode_chunk(chunk)
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.first
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.payload
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.string
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.then { JSON.parse(_1) }
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.dig("bytes")
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.then { Base64.decode64(_1) }
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rescue JSON::ParserError,
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Aws::EventStream::Errors::MessageChecksumError,
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Aws::EventStream::Errors::PreludeChecksumError => e
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Rails.logger.error("#{self.class.name}: #{e.message}")
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nil
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end
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def extract_completion_from(response_raw)
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JSON.parse(response_raw, symbolize_names: true)[:completion].to_s
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end
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def partials_from(decoded_chunk)
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[decoded_chunk]
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end
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end
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end
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end
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end
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