184 lines
5.5 KiB
Ruby
184 lines
5.5 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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class << self
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def can_contact?(endpoint_name)
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endpoint_name == "aws_bedrock"
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end
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def dependant_setting_names
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%w[ai_bedrock_access_key_id ai_bedrock_secret_access_key ai_bedrock_region]
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end
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def correctly_configured?(_model)
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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 endpoint_name(model_name)
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"AWS Bedrock - #{model_name}"
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end
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end
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def normalize_model_params(model_params)
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model_params = model_params.dup
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# max_tokens, temperature, stop_sequences, top_p are already supported
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model_params
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end
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def default_options(dialect)
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options = { max_tokens: 3_000, anthropic_version: "bedrock-2023-05-31" }
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options
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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 prompt_size(prompt)
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# approximation
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tokenizer.size(prompt.system_prompt.to_s + " " + prompt.messages.to_s)
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end
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def model_uri
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# See: https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids-arns.html
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#
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# FYI there is a 2.0 version of Claude, very little need to support it given
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# haiku/sonnet are better fits anyway, we map to claude-2.1
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bedrock_model_id =
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case model
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when "claude-2"
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"anthropic.claude-v2:1"
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when "claude-3-haiku"
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"anthropic.claude-3-haiku-20240307-v1:0"
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when "claude-3-sonnet"
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"anthropic.claude-3-sonnet-20240229-v1:0"
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when "claude-instant-1"
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"anthropic.claude-instant-v1"
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when "claude-3-opus"
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"anthropic.claude-3-opus-20240229-v1:0"
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end
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api_url =
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llm_model&.url ||
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"https://bedrock-runtime.#{SiteSetting.ai_bedrock_region}.amazonaws.com/model/#{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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payload = default_options(dialect).merge(model_params).merge(messages: prompt.messages)
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payload[:system] = prompt.system_prompt if prompt.system_prompt.present?
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payload[:tools] = prompt.tools if prompt.tools.present?
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payload
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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: llm_model&.api_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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@decoder ||= Aws::EventStream::Decoder.new
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decoded, _done = @decoder.decode_chunk(chunk)
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messages = []
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return messages if !decoded
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i = 0
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while decoded
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parsed = JSON.parse(decoded.payload.string)
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# perhaps some control message we can just ignore
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messages << Base64.decode64(parsed["bytes"]) if parsed && parsed["bytes"]
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decoded, _done = @decoder.decode_chunk
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i += 1
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if i > 10_000
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Rails.logger.error(
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"DiscourseAI: Stream decoder looped too many times, logic error needs fixing",
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)
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break
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end
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end
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messages
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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 final_log_update(log)
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log.request_tokens = processor.input_tokens if processor.input_tokens
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log.response_tokens = processor.output_tokens if processor.output_tokens
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end
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def processor
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@processor ||=
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DiscourseAi::Completions::AnthropicMessageProcessor.new(streaming_mode: @streaming_mode)
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end
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def add_to_function_buffer(function_buffer, partial: nil, payload: nil)
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processor.to_xml_tool_calls(function_buffer) if !partial
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end
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def extract_completion_from(response_raw)
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processor.process_message(response_raw)
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end
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def has_tool?(_response_data)
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processor.tool_calls.present?
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end
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def partials_from(decoded_chunks)
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decoded_chunks
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end
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def native_tool_support?
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true
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end
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def chunk_to_string(chunk)
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joined = +chunk.join("\n")
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joined << "\n" if joined.length > 0
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joined
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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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