Class: Legion::Extensions::Llm::Provider

Inherits:
Object
  • Object
show all
Includes:
Cache::Helper, Streaming, Logging::Helper
Defined in:
lib/legion/extensions/llm/provider.rb,
lib/legion/extensions/llm/provider/open_ai_compatible.rb

Overview

Base class for LLM providers.

Defined Under Namespace

Modules: OpenAICompatible

Constant Summary collapse

MODEL_DETAIL_CACHE_SCHEMA_VERSION = 
2

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Streaming

build_on_data_handler, build_stream_callback, build_stream_error_response, error_chunk?, faraday_1?, handle_data, handle_error_chunk, handle_error_event, handle_failed_response, handle_json_error_chunk, handle_parsed_error, handle_sse, handle_stream, json_error_payload?, parse_error_from_json, parse_streaming_error, persist_failed_response_body, persist_failed_response_custom_body?, persist_failed_response_env_body?, process_stream_chunk, raise_partial_streaming_error, raise_streaming_status_error, stream_response

Constructor Details

#initialize(config) ⇒ Provider

Returns a new instance of Provider.



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# File 'lib/legion/extensions/llm/provider.rb', line 37

def initialize(config)
  @config = config.is_a?(Hash) ? HashConfig.new(config) : config
  ensure_configured!
  @connection = Connection.new(self, @config)
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/legion/extensions/llm/provider.rb', line 35

def config
  @config
end

#connection ⇒ Object (readonly)

Returns the value of attribute connection.



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# File 'lib/legion/extensions/llm/provider.rb', line 35

def connection
  @connection
end

Class Method Details

.assume_models_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 527

def assume_models_exist?
  false
end

.capabilities ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 499

def capabilities
  nil
end

.configuration_options ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 507

def configuration_options
  []
end

.configuration_requirements ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 503

def configuration_requirements
  []
end

.configured?(config) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 535

def configured?(config)
  configuration_requirements.all? { |req| config.send(req) }
end

.default_tier ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 515

def default_tier
  :frontier
end

.default_transport ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 511

def default_transport
  :http
end

.local? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 519

def local?
  false
end

.name ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 491

def name
  to_s.split('::').last
end

.remote? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 523

def remote?
  !local?
end

.resolve_model_id(model_id, config: nil) ⇒ Object

rubocop:disable Lint/UnusedMethodArgument



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# File 'lib/legion/extensions/llm/provider.rb', line 531

def resolve_model_id(model_id, config: nil) # rubocop:disable Lint/UnusedMethodArgument
  model_id
end

.slug ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 495

def slug
  name.downcase
end

Instance Method Details

#api_base ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/legion/extensions/llm/provider.rb', line 43

def api_base
  raise NotImplementedError
end

#assume_models_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 259

def assume_models_exist?
  self.class.assume_models_exist?
end

#cache_control_prefix_tokens ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 243

def cache_control_prefix_tokens
  if config.respond_to?(:cache_control_prefix_tokens) && config.cache_control_prefix_tokens
    config.cache_control_prefix_tokens
  else
    4
  end
end

#cache_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 230

def cache_enabled?
  explicit = config.llm_cache_enabled if config.respond_to?(:llm_cache_enabled)

  unless explicit.nil?
    log.debug { "[#{slug}] cache_enabled? source=per_provider value=#{explicit}" }
    return explicit == true
  end

  global = global_prompt_caching_enabled?
  log.debug { "[#{slug}] cache_enabled? source=global value=#{global}" }
  global
end

#cache_instance_key ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 474

def cache_instance_key
  if cache_local_instance?
    (respond_to?(:instance_id) ? instance_id : :default).to_s
  else
    require 'digest'
    urls = Array(config_base_url).map { |u| strip_scheme(u).downcase.chomp('/') }.sort
    Digest::SHA256.hexdigest(urls.join('|'))[0, 12]
  end
end

#cache_local_instance? ⇒ Boolean

── Cache helpers with local/shared tier selection ────────────────

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 438

def cache_local_instance?
  Array(config_base_url).any? do |url|
    host = url.to_s.downcase
    host.include?('localhost') || host.include?('127.0.0.1') || host.include?('::1')
  end
end

#capabilities ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 78

def capabilities
  self.class.capabilities
end

#chat(messages:, model:, tools: [], temperature: nil, params: {}, headers: {}, schema: nil, thinking: nil, tool_prefs: nil) ⇒ Object

rubocop:disable Metrics/ParameterLists



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# File 'lib/legion/extensions/llm/provider.rb', line 87

def chat(messages:, model:, tools: [], temperature: nil, params: {}, headers: {}, schema: nil, thinking: nil,
         tool_prefs: nil)
  complete(messages, tools:, temperature:, model:, params:, headers:, schema:, thinking:, tool_prefs:)
end

#complete(messages, tools:, temperature:, model:, params: {}, headers: {}, schema: nil, thinking: nil, tool_prefs: nil) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 97

def complete(messages, tools:, temperature:, model:, params: {}, headers: {}, schema: nil, thinking: nil,
             tool_prefs: nil, &)
  normalized_temperature = maybe_normalize_temperature(temperature, model)
  log_provider_request(
    messages: messages,
    tools: tools,
    temperature: temperature,
    normalized_temperature: normalized_temperature,
    model: model,
    params: params,
    headers: headers,
    schema: schema,
    thinking: thinking,
    tool_prefs: tool_prefs,
    streaming: block_given?
  )

  payload = Utils.deep_merge(
    render_payload(
      messages,
      tools: tools,
      tool_prefs: tool_prefs,
      temperature: normalized_temperature,
      model: model,
      stream: block_given?,
      schema: schema,
      thinking: thinking
    ),
    params
  )

  if block_given?
    stream_response @connection, payload, headers, &
  else
    sync_response @connection, payload, headers
  end
end

#config_base_url ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 396

def config_base_url
  respond_to?(:settings) ? settings[:base_url] : nil
end

#configuration_requirements ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 82

def configuration_requirements
  self.class.configuration_requirements
end

#configured? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 226

def configured?
  configuration_requirements.all? { |req| @config.send(req) }
end

#count_tokens(messages:, model:, params: {}) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 211

def count_tokens(messages:, model:, params: {})
  _ = [model, params]
  Array(messages).sum do |message|
    content = message.respond_to?(:content) ? message.content : message[:content] || message['content']
    estimate_text_tokens(content)
  end
end

#discover_offerings(live: false, raise_on_unreachable: false, **filters) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 142

def discover_offerings(live: false, raise_on_unreachable: false, **filters)
  return filter_cached_offerings(Array(@cached_offerings), filters) unless live

  provider_health = health(live:)
  @cached_offerings = Array(list_models(live:, **filters)).filter_map do |model|
    next unless model_matches_filters?(model, filters)
    next unless model_allowed?(model.id)

    offering_from_model(model, health: provider_health)
  end
  @cached_offerings
rescue Faraday::ConnectionFailed, Faraday::TimeoutError => e
  log.warn("[#{slug}] instance=#{provider_instance_id} unreachable: #{e.message}")
  raise if raise_on_unreachable

  []
end

#embed(text:, model:, dimensions: nil, params: {}, headers: {}) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 186

def embed(text:, model:, dimensions: nil, params: {}, headers: {})
  payload = Utils.deep_merge(render_embedding_payload(text, model:, dimensions:), params)
  response = @connection.post(embedding_url(model:), payload) do |req|
    req.headers = headers.merge(req.headers) unless headers.empty?
  end
  parse_embedding_response(response, model:, text:)
end

#endpoint_manifest ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 285

def endpoint_manifest
  endpoint_methods.each_with_object({}) do |(key, method_name), result|
    next unless respond_to?(method_name)

    value = public_send(method_name)
    result[key] = value unless value.nil?
  rescue ArgumentError, NotImplementedError
    next
  end
end

#fetch_model_detail(_model_name) ⇒ Object

Override in subclasses to make a live API call for model detail. Must return a Hash with symbol keys (e.g. { context_window: 128000 }).



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# File 'lib/legion/extensions/llm/provider.rb', line 470

def fetch_model_detail(_model_name)
  nil
end

#find_reachable_url(urls) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 408

def find_reachable_url(urls)
  urls.each do |url|
    full = normalize_url(url)
    return full if url_reachable?(full)
  end
  nil
end

#format_messages(messages) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 318

def format_messages(messages)
  messages.map do |msg|
    {
      role: msg.role.to_s,
      content: msg.content
    }
  end
end

#format_tool_calls(_tool_calls) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 327

def format_tool_calls(_tool_calls)
  nil
end

#headers ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 47

def headers
  identity_headers
end

#health(live: false) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 160

def health(live: false)
  readiness_data = readiness(live:)
  raw_health = readiness_data[:health] || readiness_data['health'] || {}
  status = health_status(readiness_data, raw_health)
  {
    provider: slug.to_sym,
    instance_id: provider_instance_id,
    status:,
    ready: readiness_data[:ready] == true || readiness_data['ready'] == true,
    circuit_state: status == 'healthy' ? 'closed' : 'open',
    latency_ms: raw_health[:latency_ms] || raw_health['latency_ms'],
    raw: raw_health
  }.compact
rescue StandardError => e
  handle_exception(e, level: :warn, handled: true, operation: 'llm.provider.health')
  {
    provider: slug.to_sym,
    instance_id: provider_instance_id,
    status: 'unhealthy',
    ready: false,
    circuit_state: 'open',
    error: e.class.name,
    message: e.message
  }
end

#identity_headers ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 51

def identity_headers
  return {} unless defined?(Legion::Identity::Process) && Legion::Identity::Process.respond_to?(:identity_hash)

  id = Legion::Identity::Process.identity_hash
  hdrs = {
    'x-legion-identity-canonical-name' => id[:canonical_name].to_s,
    'x-legion-identity-trust' => id[:trust].to_s,
    'x-legion-identity-id' => id[:id].to_s,
    'x-legion-identity-kind' => id[:kind].to_s,
    'x-legion-identity-mode' => id[:mode].to_s,
    'x-legion-identity-source' => id[:source].to_s
  }
  hdrs['x-legion-identity-db-principal-id'] = id[:db_principal_id].to_s if id[:db_principal_id]
  hdrs['x-legion-identity-db-identity-id']  = id[:db_identity_id].to_s if id[:db_identity_id]
  hdrs
rescue StandardError
  {}
end

#image(prompt:, model:, size:, with: nil, mask: nil, params: {}) ⇒ Object

rubocop:disable Metrics/ParameterLists



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# File 'lib/legion/extensions/llm/provider.rb', line 207

def image(prompt:, model:, size:, with: nil, mask: nil, params: {}) # rubocop:disable Metrics/ParameterLists
  paint(prompt, model:, size:, with:, mask:, params:)
end

#list_models(live: false, **filters) ⇒ Object

rubocop:enable Metrics/ParameterLists



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# File 'lib/legion/extensions/llm/provider.rb', line 136

def list_models(live: false, **filters)
  _ = [live, filters]
  response = @connection.get models_url
  parse_list_models_response response, slug, capabilities
end

#local? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 251

def local?
  self.class.local?
end

#model_allowed?(model_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 366

def model_allowed?(model_name)
  name = model_name.to_s.downcase
  wl = model_whitelist
  bl = model_blacklist

  return false if wl.any? && wl.none? { |p| name.include?(p) }
  return false if bl.any? && bl.any? { |p| name.include?(p) }

  true
end

#model_blacklist ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 344

def model_blacklist
  bl = config.model_blacklist if config.respond_to?(:model_blacklist)
  bl ||= settings[:model_blacklist] if respond_to?(:settings) && settings.is_a?(Hash)
  bl ||= runtime_provider_setting(:model_blacklist)
  Array(bl).map { |p| p.to_s.downcase }
end

#model_cache_get(key) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 445

def model_cache_get(key)
  return nil unless defined?(Legion::Cache)

  cache_local_instance? ? local_cache_get(key) : cache_get(key)
rescue StandardError => e
  handle_exception(e, level: :debug, handled: true, operation: 'llm.provider.model_cache_get', key:)
  nil
end

#model_detail(model_name) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 454

def model_detail(model_name)
  key = model_detail_cache_key(model_name)
  cached = cache_get(key)
  return cached if cached

  result = fetch_model_detail(model_name)
  cache_set(key, result, ttl: 86_400) if result
  result
rescue StandardError => e
  handle_exception(e, level: :warn, handled: true, operation: 'llm.provider.model_detail',
                      model: model_name)
  nil
end

#model_whitelist ⇒ Object

── Model allow-list / deny-list filtering ────────────────────────



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# File 'lib/legion/extensions/llm/provider.rb', line 337

def model_whitelist
  wl = config.model_whitelist if config.respond_to?(:model_whitelist)
  wl ||= settings[:model_whitelist] if respond_to?(:settings) && settings.is_a?(Hash)
  wl ||= runtime_provider_setting(:model_whitelist)
  Array(wl).map { |p| p.to_s.downcase }
end

#moderate(input, model:) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 194

def moderate(input, model:)
  payload = render_moderation_payload(input, model:)
  response = @connection.post moderation_url, payload
  parse_moderation_response(response, model:)
end

#name ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 74

def name
  self.class.name
end

#normalize_url(url) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 400

def normalize_url(url)
  raw = url.to_s.strip
  return raw if raw.match?(%r{^https?://})

  scheme = tls_enabled? ? 'https' : 'http'
  "#{scheme}://#{raw}"
end

#offering_tier ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 383

def offering_tier
  config.respond_to?(:tier) ? config.tier : self.class.default_tier
end

#offering_transport ⇒ Object

── Offering defaults ─────────────────────────────────────────────



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# File 'lib/legion/extensions/llm/provider.rb', line 379

def offering_transport
  config.respond_to?(:transport) ? config.transport : self.class.default_transport
end

#paint(prompt, model:, size:, with: nil, mask: nil, params: {}) ⇒ Object

rubocop:disable Metrics/ParameterLists



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# File 'lib/legion/extensions/llm/provider.rb', line 200

def paint(prompt, model:, size:, with: nil, mask: nil, params: {}) # rubocop:disable Metrics/ParameterLists
  validate_paint_inputs!(with:, mask:)
  payload = render_image_payload(prompt, model:, size:, with:, mask:, params:)
  response = @connection.post images_url(with:, mask:), payload
  parse_image_response(response, model:)
end

#parse_error(response) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 296

def parse_error(response)
  return if response.body.empty?

  body = try_parse_json(response.body)
  case body
  when Hash
    error = body['error']
    return error if error.is_a?(String)

    body.dig('error', 'message')
  when Array
    body.map do |part|
      error = part['error']
      error.is_a?(String) ? error : part.dig('error', 'message')
    end.join('. ')
  when String
    body[/"message"\s*:\s*"([^"]{1,500})/, 1] || body
  else
    body
  end
end

#parse_tool_calls(_tool_calls) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 331

def parse_tool_calls(_tool_calls)
  nil
end

#provider_instance_id ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 484

def provider_instance_id
  return config.instance_id.to_sym if config.respond_to?(:instance_id) && config.instance_id

  :default
end

#readiness(live: false) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 263

def readiness(live: false)
  metadata = {
    provider: slug.to_sym,
    name: name,
    configured: configured?,
    ready: configured?,
    local: local?,
    remote: remote?,
    api_base: api_base,
    endpoints: endpoint_manifest,
    live: live
  }

  return metadata.merge(health: { checked: false }) unless live && metadata[:endpoints][:health]

  response = @connection.get(metadata[:endpoints][:health])
  metadata.merge(ready: configured? && health_ready?(response.body), health: response.body)
rescue StandardError => e
  handle_exception(e, level: :warn, handled: true, operation: 'llm.provider.readiness')
  metadata.merge(ready: false, health: { error: e.class.name, message: e.message })
end

#remote? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 255

def remote?
  self.class.remote?
end

#resolve_base_url ⇒ Object

── Multi-host base_url resolution ────────────────────────────────



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# File 'lib/legion/extensions/llm/provider.rb', line 389

def resolve_base_url
  urls = Array(config_base_url)
  return nil if urls.empty?

  @resolve_base_url ||= find_reachable_url(urls) || normalize_url(urls.first)
end

#runtime_provider_setting(key) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 351

def runtime_provider_setting(key)
  return nil unless defined?(Legion::Settings)

  ext = Legion::Settings[:extensions]
  return nil unless ext.is_a?(Hash) && ext[:llm].is_a?(Hash)

  provider_key = self.class.respond_to?(:slug) ? self.class.slug.to_sym : nil
  return nil unless provider_key

  provider_conf = ext[:llm][provider_key]
  provider_conf.is_a?(Hash) ? provider_conf[key] : nil
rescue StandardError
  nil
end

#slug ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 70

def slug
  self.class.slug
end

#stream_chat(messages:, model:, tools: [], temperature: nil, params: {}, headers: {}, schema: nil, thinking: nil, tool_prefs: nil) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 92

def stream_chat(messages:, model:, tools: [], temperature: nil, params: {}, headers: {}, schema: nil,
                thinking: nil, tool_prefs: nil, &)
  complete(messages, tools:, temperature:, model:, params:, headers:, schema:, thinking:, tool_prefs:, &)
end

#strip_scheme(url) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 416

def strip_scheme(url)
  url.to_s.sub(%r{^https?://}, '')
end

#tls_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 431

def tls_enabled?
  tls = respond_to?(:settings) ? settings[:tls] : nil
  tls.is_a?(Hash) && tls[:enabled] == true
end

#transcribe(audio_file, model:, language:) ⇒ Object 



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# File 'lib/legion/extensions/llm/provider.rb', line 219

def transcribe(audio_file, model:, language:, **)
  file_part = build_audio_file_part(audio_file)
  payload = render_transcription_payload(file_part, model:, language:, **)
  response = @connection.post transcription_url, payload
  parse_transcription_response(response, model:)
end

#url_reachable?(url) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/llm/provider.rb', line 420

def url_reachable?(url)
  require 'uri'
  require 'socket'
  uri = URI.parse(url)
  Socket.tcp(uri.host, uri.port, connect_timeout: 1).close
  true
rescue StandardError => e
  handle_exception(e, level: :debug, handled: true, operation: 'llm.provider.url_reachable', url:)
  false
end