discourse-ai/lib/completions/endpoints/aws_bedrock.rb

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# frozen_string_literal: true
require "aws-sigv4"
module DiscourseAi
module Completions
module Endpoints
class AwsBedrock < Base
class << self
def can_contact?(endpoint_name, model_name)
endpoint_name == "aws_bedrock" &&
%w[claude-instant-1 claude-2 claude-3-haiku claude-3-sonnet].include?(model_name)
end
def dependant_setting_names
%w[ai_bedrock_access_key_id ai_bedrock_secret_access_key ai_bedrock_region]
end
def correctly_configured?(model)
SiteSetting.ai_bedrock_access_key_id.present? &&
SiteSetting.ai_bedrock_secret_access_key.present? &&
SiteSetting.ai_bedrock_region.present? && can_contact?("aws_bedrock", model)
end
def endpoint_name(model_name)
"AWS Bedrock - #{model_name}"
end
end
def normalize_model_params(model_params)
model_params = model_params.dup
# max_tokens, temperature, stop_sequences, top_p are already supported
model_params
end
def default_options(dialect)
options = { max_tokens: 3_000, anthropic_version: "bedrock-2023-05-31" }
options[:stop_sequences] = ["</function_calls>"] if dialect.prompt.has_tools?
options
end
def provider_id
AiApiAuditLog::Provider::Anthropic
end
private
def prompt_size(prompt)
# approximation
super(prompt.system_prompt.to_s + " " + prompt.messages.to_s)
end
def model_uri
# See: https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids-arns.html
#
# FYI there is a 2.0 version of Claude, very little need to support it given
# haiku/sonnet are better fits anyway, we map to claude-2.1
bedrock_model_id =
case model
when "claude-2"
"anthropic.claude-v2:1"
when "claude-3-haiku"
"anthropic.claude-3-haiku-20240307-v1:0"
when "claude-3-sonnet"
"anthropic.claude-3-sonnet-20240229-v1:0"
when "claude-instant-1"
"anthropic.claude-instant-v1"
end
api_url =
"https://bedrock-runtime.#{SiteSetting.ai_bedrock_region}.amazonaws.com/model/#{bedrock_model_id}/invoke"
api_url = @streaming_mode ? (api_url + "-with-response-stream") : api_url
URI(api_url)
end
def prepare_payload(prompt, model_params, dialect)
payload = default_options(dialect).merge(model_params).merge(messages: prompt.messages)
payload[:system] = prompt.system_prompt if prompt.system_prompt.present?
payload
end
def prepare_request(payload)
headers = { "content-type" => "application/json", "Accept" => "*/*" }
signer =
Aws::Sigv4::Signer.new(
access_key_id: SiteSetting.ai_bedrock_access_key_id,
region: SiteSetting.ai_bedrock_region,
secret_access_key: SiteSetting.ai_bedrock_secret_access_key,
service: "bedrock",
)
Net::HTTP::Post
.new(model_uri)
.tap do |r|
r.body = payload
signed_request =
signer.sign_request(req: r, http_method: r.method, url: model_uri, body: r.body)
r.initialize_http_header(headers.merge(signed_request.headers))
end
end
def decode(chunk)
parsed =
Aws::EventStream::Decoder
.new
.decode_chunk(chunk)
.first
.payload
.string
.then { JSON.parse(_1) }
bytes = parsed.dig("bytes")
if !bytes
Rails.logger.error("#{self.class.name}: #{parsed.to_s[0..500]}")
nil
else
Base64.decode64(parsed.dig("bytes"))
end
rescue JSON::ParserError,
Aws::EventStream::Errors::MessageChecksumError,
Aws::EventStream::Errors::PreludeChecksumError => e
Rails.logger.error("#{self.class.name}: #{e.message}")
nil
end
def final_log_update(log)
log.request_tokens = @input_tokens if @input_tokens
log.response_tokens = @output_tokens if @output_tokens
end
def extract_completion_from(response_raw)
result = ""
parsed = JSON.parse(response_raw, symbolize_names: true)
if @streaming_mode
if parsed[:type] == "content_block_start" || parsed[:type] == "content_block_delta"
result = parsed.dig(:delta, :text).to_s
elsif parsed[:type] == "message_start"
@input_tokens = parsed.dig(:message, :usage, :input_tokens)
elsif parsed[:type] == "message_delta"
@output_tokens = parsed.dig(:delta, :usage, :output_tokens)
end
else
result = parsed.dig(:content, 0, :text).to_s
@input_tokens = parsed.dig(:usage, :input_tokens)
@output_tokens = parsed.dig(:usage, :output_tokens)
end
result
end
def partials_from(decoded_chunk)
[decoded_chunk]
end
end
end
end
end