Module: Cloudflare::AI

Defined in:
lib/homura/runtime/ai.rb

Defined Under Namespace

Classes: Binding, Stream

Constant Summary collapse

DEFAULT_OPTIONS =

Default REST options forwarded to env.AI.run as the third argument.

{}.freeze
DEFAULT_CHAT_MODEL = 
"@cf/moonshotai/kimi-k2.6"
DEFAULT_TRANSCRIBE_MODEL = 
"@cf/openai/whisper"
DEFAULT_SPEAK_MODEL = 
"@cf/deepgram/aura-1"

Class Method Summary collapse

Class Method Details

.audio_input(audio) ⇒ Object 



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# File 'lib/homura/runtime/ai.rb', line 319

def self.audio_input(audio)
  if audio.respond_to?(:to_uint8_array)
    uint8 = audio.to_uint8_array
    return `Array.from(#{uint8})`
  end

  return audio if audio.is_a?(Array)
  if `typeof #{audio} !== 'undefined' && #{audio} instanceof Uint8Array`
    return `Array.from(#{audio})`
  end

  audio
end

.build_messages(prompt = nil, messages: nil, system: nil) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/homura/runtime/ai.rb', line 303

def self.build_messages(prompt = nil, messages: nil, system: nil)
  out = []
  out << {role: "system", content: system.to_s} if system
  if messages
    unless messages.is_a?(Array)
      raise ArgumentError, "messages must be an Array of chat messages"
    end

    out.concat(messages)
  end

  out << {role: "user", content: prompt.to_s} unless prompt.nil?
  raise ArgumentError, "chat requires a prompt or messages" if out.empty?
  out
end

.chat_input_options(model, input_options) ⇒ Object 



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# File 'lib/homura/runtime/ai.rb', line 333

def self.chat_input_options(model, input_options)
  return input_options unless model.to_s == DEFAULT_CHAT_MODEL

  options = input_options.dup
  key = if options.key?(:chat_template_kwargs)
    :chat_template_kwargs
  elsif options.key?("chat_template_kwargs")
    "chat_template_kwargs"
  end

  template_kwargs = key ? options[key] : nil
  if template_kwargs && !template_kwargs.is_a?(Hash)
    raise ArgumentError, "chat_template_kwargs must be a Hash"
  end

  merged = (template_kwargs || {}).dup
  unless merged.key?(:thinking) || merged.key?("thinking")
    merged[:thinking] = false
  end

  options[key || :chat_template_kwargs] = merged
  options
end

.extract_text(out) ⇒ Object 



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# File 'lib/homura/runtime/ai.rb', line 357

def self.extract_text(out)
  return out.to_s unless out.is_a?(Hash)
  if out["choices"].is_a?(Array) && !out["choices"].empty?
    msg = out["choices"][0].is_a?(Hash) ? out["choices"][0]["message"] : nil
    text = message_hash_text(msg)
    return text unless text.empty?
  end

  if out["messages"].is_a?(Array) && !out["messages"].empty?
    msg = out["messages"].find do |entry|
      entry.is_a?(Hash) && entry["role"].to_s == "assistant"
    end ||
      out["messages"][0]
    text = message_hash_text(msg)
    return text unless text.empty?
  end

  %w[text transcription response result output].each do |key|
    value = message_content_text(out[key])
    return value unless value.empty?
  end

  nested = out["result"]
  return extract_text(nested) if nested.is_a?(Hash)
  ""
end

.message_content_text(value) ⇒ Object 



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# File 'lib/homura/runtime/ai.rb', line 384

def self.message_content_text(value)
  case value
  when String
    value
  when Array
    value
      .map { |part| part.is_a?(Hash) ? part["text"].to_s : part.to_s }
      .join
  else
    ""
  end
end

.message_hash_text(value) ⇒ Object 



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# File 'lib/homura/runtime/ai.rb', line 397

def self.message_hash_text(value)
  return "" unless value.is_a?(Hash)
  %w[
    content
    reasoning
    reasoning_content
    reasoningContent
    text
  ].each do |key|
    text = message_content_text(value[key])
    return text unless text.empty?
  end

  ""
end

.ruby_to_js(val) ⇒ Object

Convert a Ruby value (Hash / Array / String / Numeric / true / false / nil) into a plain JS object suitable for env.AI.run inputs.



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# File 'lib/homura/runtime/ai.rb', line 415

def self.ruby_to_js(val)
  if `#{val} != null && typeof #{val} === 'object' && #{val}.$$class == null`
    return val
  end

  if val.is_a?(Hash)
    obj = `({})`
    val.each do |k, v|
      ks = k.to_s
      jv = ruby_to_js(v)
      `#{obj}[#{ks}] = #{jv}`
    end

    obj
  elsif val.is_a?(Array)
    arr = `([])`
    val.each do |v|
      jv = ruby_to_js(v)
      `#{arr}.push(#{jv})`
    end

    arr
  elsif val.is_a?(Symbol)
    val.to_s
  else
    val
  end
end

.run(model, inputs, binding: nil, options: nil, raw_response: false) ⇒ Object

Run a Workers AI model. Returns a JS Promise that resolves to a Ruby Hash for non-streaming calls, or to a Cloudflare::AI::Stream wrapping the JS ReadableStream for streaming calls.

Parameters:

  • model (String) —

    catalog model id, e.g. ‘@cf/google/gemma-4-26b-a4b-it’

  • inputs (Hash) —

    model inputs (messages / prompt / max_tokens / etc.)

  • binding (JS object) (defaults to: nil) —

    env.AI binding (required)

  • options (Hash) (defaults to: nil) —

    gateway / extra options forwarded as the 3rd arg



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# File 'lib/homura/runtime/ai.rb', line 172

def self.run(model, inputs, binding: nil, options: nil, raw_response: false)
  if defined?(Binding) &&
      `(#{binding} != null && #{binding}.$$class === #{Binding})`
    binding = binding.js
  end
  # Use a JS-side null check because `binding` may be a raw JS object
  # (env.AI), which has no Ruby `#nil?` method on the prototype.
  bound = !`(#{binding} == null)`
  unless bound
    raise AIError.new("AI binding not bound (env.AI is null)", model: model)
  end

  js_inputs = ruby_to_js(inputs)
  js_options = options ? ruby_to_js(options) : `({})`
  ai_binding = binding
  err_klass = Cloudflare::AIError
  stream_klass = Cloudflare::AI::Stream
  # Streaming may be requested either via `inputs[:stream]` (the
  # newer Workers AI shape) or `options: { stream: true }` (the
  # 3rd-arg "options" contract). Accept both so callers can use
  # whichever idiom matches the model docs they're following.
  streaming = (inputs.is_a?(Hash) &&
    (inputs[:stream] == true || inputs["stream"] == true)) ||
    (options.is_a?(Hash) &&
      (options[:stream] == true || options["stream"] == true))
  cf = Cloudflare

  # NOTE: multi-line backtick → Promise works HERE because the
  # value is assigned to `js_promise` (Opal emits the statement AND
  # keeps the returned value alive through the local). Do NOT
  # refactor this so the backtick is the method's last expression
  # or the Promise will be silently dropped (same pitfall
  # documented in lib/homura/runtime/{cache,queue}.rb —
  # Phase 11B audit).
  js_promise = `
    (async function() {
      var out;
      try {
        out = await #{ai_binding}.run(#{model}, #{js_inputs}, #{js_options});
      } catch (e) {
        #{Kernel}.$raise(#{err_klass}.$new(e && e.message ? e.message : String(e), Opal.hash({ model: #{model}, operation: 'run' })));
      }
      return out;
    })()
  `

  js_result = js_promise.__await__

  if raw_response
    RawResponse.new(js_result)
  elsif streaming
    # Workers AI returns a ReadableStream<Uint8Array> when stream:true.
    # Wrap it so the Sinatra route can return it as an SSE body.
    stream_klass.new(js_result)
  else
    cf.js_to_ruby(js_result)
  end
end

.speak(model, inputs, binding: nil, options: nil) ⇒ Object 



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# File 'lib/homura/runtime/ai.rb', line 231

def self.speak(model, inputs, binding: nil, options: nil)
  if defined?(Binding) &&
      `(#{binding} != null && #{binding}.$$class === #{Binding})`
    binding = binding.js
  end

  bound = !`(#{binding} == null)`
  unless bound
    raise AIError.new("AI binding not bound (env.AI is null)", model: model)
  end

  js_inputs = ruby_to_js(inputs)
  js_options = ruby_to_js((options || {}).merge(returnRawResponse: true))
  ai_binding = binding
  err_klass = Cloudflare::AIError

  js_response = `
    (async function() {
      try {
        return await #{ai_binding}.run(#{model}, #{js_inputs}, #{js_options});
      } catch (e) {
        #{Kernel}.$raise(#{err_klass}.$new(e && e.message ? e.message : String(e), Opal.hash({ model: #{model}, operation: 'speak' })));
      }
    })()
  `
    .__await__

  content_type = `#{js_response}.headers.get("content-type") || "application/octet-stream"`
  cache_control = `#{js_response}.headers.get("cache-control")`
  BinaryBody.new(`#{js_response}.body`, content_type, cache_control)
end

.speak_data_url(model, inputs, binding: nil, options: nil) ⇒ Object 



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# File 'lib/homura/runtime/ai.rb', line 263

def self.speak_data_url(model, inputs, binding: nil, options: nil)
  if defined?(Binding) &&
      `(#{binding} != null && #{binding}.$$class === #{Binding})`
    binding = binding.js
  end

  bound = !`(#{binding} == null)`
  unless bound
    raise AIError.new("AI binding not bound (env.AI is null)", model: model)
  end

  js_inputs = ruby_to_js(inputs)
  js_options = ruby_to_js((options || {}).merge(returnRawResponse: true))
  ai_binding = binding
  err_klass = Cloudflare::AIError

  js_response = `
    (async function() {
      try {
        return await #{ai_binding}.run(#{model}, #{js_inputs}, #{js_options});
      } catch (e) {
        #{Kernel}.$raise(#{err_klass}.$new(e && e.message ? e.message : String(e), Opal.hash({ model: #{model}, operation: 'speak_data_url' })));
      }
    })()
  `
    .__await__

  content_type = `#{js_response}.headers.get("content-type") || "application/octet-stream"`
  `
    (async function(resp, ct) {
      var buf = await resp.arrayBuffer();
      var bytes = new Uint8Array(buf);
      var bin = '';
      for (var i = 0; i < bytes.length; i++) bin += String.fromCharCode(bytes[i]);
      return 'data:' + ct + ';base64,' + globalThis.btoa(bin);
    })(#{js_response}, #{content_type})
  `
    .__await__
end