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// Package llm defines LLM provider interfaces, request options, configuration, and factory to build a client from config.
package llm
import (
"context"
"errors"
"strings"
"sync"
)
// Message represents a chat-style prompt message.
type Message struct {
Role string
Content string
}
// Client is a minimal LLM provider interface.
// Future providers (Ollama, etc.) should implement this.
type Client interface {
// Chat sends chat messages and returns the assistant text.
Chat(ctx context.Context, messages []Message, opts ...RequestOption) (string, error)
// Name returns the provider's short name (e.g., "openai", "ollama").
Name() string
// DefaultModel returns the configured default model name.
DefaultModel() string
}
// Streamer is an optional interface that providers may implement to support
// token-by-token streaming responses. Callers can type-assert to Streamer and
// fall back to Client.Chat when not implemented.
type Streamer interface {
// ChatStream sends chat messages and invokes onDelta with incremental text
// chunks as they are produced by the model. Implementations should call
// onDelta with empty strings sparingly (prefer only non-empty chunks).
ChatStream(ctx context.Context, messages []Message, onDelta func(string), opts ...RequestOption) error
}
// CodeCompleter is an optional interface for providers that support a
// prompt/suffix code-completion API (e.g., Copilot Codex endpoint). Clients
// can type-assert to this and prefer it over chat when available.
type CodeCompleter interface {
// CodeCompletion requests up to n suggestions given a left-hand prompt and
// right-hand suffix around the cursor. Language is advisory and may be
// ignored. Temperature applies when provider supports it.
CodeCompletion(ctx context.Context, prompt string, suffix string, n int, language string, temperature float64) ([]string, error)
}
// Options for a request. Providers may ignore unsupported fields.
type Options struct {
Model string
Temperature float64
MaxTokens int
Stop []string
}
// RequestOption mutates Options.
type RequestOption func(*Options)
// WithModel sets the model name for a request.
func WithModel(model string) RequestOption { return func(o *Options) { o.Model = model } }
// WithTemperature sets the sampling temperature for a request.
func WithTemperature(t float64) RequestOption { return func(o *Options) { o.Temperature = t } }
// WithMaxTokens sets the maximum number of tokens to generate.
func WithMaxTokens(n int) RequestOption { return func(o *Options) { o.MaxTokens = n } }
// WithStop sets custom stop sequences for a request.
func WithStop(stop ...string) RequestOption {
return func(o *Options) { o.Stop = append([]string{}, stop...) }
}
// Config defines provider configuration read from the Hexai config file.
type Config struct {
Provider string
RequestTimeout int // seconds; 0 means use default (30s)
// OpenAI options
OpenAIBaseURL string
OpenAIModel string
OpenAITemperature *float64
// OpenRouter options
OpenRouterBaseURL string
OpenRouterModel string
OpenRouterTemperature *float64
// Ollama options
OllamaBaseURL string
OllamaModel string
OllamaTemperature *float64
// Anthropic options
AnthropicBaseURL string
AnthropicModel string
AnthropicTemperature *float64
}
// ProviderKeys contains API credentials used by provider factories.
type ProviderKeys struct {
OpenAIAPIKey string
OpenRouterAPIKey string
AnthropicAPIKey string
}
// ProviderFactory builds an LLM client for a named provider.
type ProviderFactory func(cfg Config, keys ProviderKeys) (Client, error)
var (
providerRegistryMu sync.RWMutex
providerRegistry = map[string]ProviderFactory{}
)
// RegisterProvider registers a provider factory by normalized name.
func RegisterProvider(name string, factory ProviderFactory) {
normalized := normalizeProvider(name)
if normalized == "" {
panic("llm: provider name cannot be empty")
}
if factory == nil {
panic("llm: provider factory cannot be nil")
}
providerRegistryMu.Lock()
defer providerRegistryMu.Unlock()
if _, exists := providerRegistry[normalized]; exists {
panic("llm: provider already registered: " + normalized)
}
providerRegistry[normalized] = factory
}
// NewFromConfig creates an LLM client using only the supplied configuration.
// The OpenAI API key is supplied separately and may be read from the environment
// by the caller; other environment-based configuration is not used.
func NewFromConfig(cfg Config, openAIAPIKey, openRouterAPIKey, anthropicAPIKey string) (Client, error) {
provider := normalizeProvider(cfg.Provider)
if provider == "" {
provider = "openai"
}
factory, ok := lookupProviderFactory(provider)
if !ok {
return nil, errors.New("unknown LLM provider: " + provider)
}
return factory(cfg, ProviderKeys{
OpenAIAPIKey: openAIAPIKey,
OpenRouterAPIKey: openRouterAPIKey,
AnthropicAPIKey: anthropicAPIKey,
})
}
func normalizeProvider(provider string) string {
return strings.ToLower(strings.TrimSpace(provider))
}
func lookupProviderFactory(provider string) (ProviderFactory, bool) {
providerRegistryMu.RLock()
defer providerRegistryMu.RUnlock()
factory, ok := providerRegistry[provider]
return factory, ok
}
func withDefaultTemperature(configured *float64, fallback float64) *float64 {
if configured != nil {
return configured
}
v := fallback
return &v
}
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