Class: ActiveHarness::Http::StreamingClient

Inherits:
Object
  • Object
show all
Defined in:
lib/active_harness/http/streaming_client.rb

Overview

Streaming variant of Client. Calls on_token for each content token as it arrives via SSE. Accumulates and returns the full content string when the stream ends.

Instance Method Summary collapse

Instance Method Details

#post(url, headers:, body:, timeout: 60, on_token:) ⇒ String

Returns full accumulated content.

Parameters:

  • url (URI)
  • headers (Hash{String => String})
  • body (String) —

    JSON-serialized body

  • timeout (Integer) (defaults to: 60) —

    seconds (open + read)

  • on_token (Proc) —

    called with each partial token string

Returns:

  • (String) —

    full accumulated content



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# File 'lib/active_harness/http/streaming_client.rb', line 16

def post(url, headers:, body:, timeout: 60, on_token:)
  http              = Net::HTTP.new(url.host, url.port)
  http.use_ssl      = true
  http.open_timeout = timeout
  http.read_timeout = timeout

  req = Net::HTTP::Post.new(url)
  headers.each { |k, v| req[k] = v }
  req.body = body

  buffer  = ""
  content = ""

  http.request(req) do |response|
    response.read_body do |chunk|
      buffer += chunk
      while (line_end = buffer.index("\n"))
        line = buffer.slice!(0, line_end + 1).strip
        next unless line.start_with?("data: ")

        data = line.delete_prefix("data: ")
        next if data == "[DONE]"

        parsed = JSON.parse(data)
        token  = parsed.dig("choices", 0, "delta", "content")
        if token && !token.empty?
          on_token.call(token)
          content += token
        end
      end
    end
  end

  content
rescue Net::OpenTimeout, Net::ReadTimeout
  raise Errors::TimeoutError, "Request to #{url.host} timed out"
rescue JSON::ParserError
  # ignore malformed SSE chunks
  content
rescue => e
  raise Errors::ProviderUnavailableError, "#{url.host} unreachable: #{e.message}"
end