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// Summary: OpenRouter client implementation leveraging OpenAI-compatible helpers with provider-specific headers.
package llm
import (
"bytes"
"context"
"encoding/json"
"errors"
"net/http"
"strings"
"time"
"codeberg.org/snonux/hexai/internal/logging"
)
type openRouterClient struct {
httpClient *http.Client
apiKey string
baseURL string
defaultModel string
chatLogger logging.ChatLogger
defaultTemperature *float64
}
func newOpenRouter(baseURL, model, apiKey string, defaultTemp *float64) Client {
if strings.TrimSpace(baseURL) == "" {
baseURL = "https://openrouter.ai/api/v1"
}
if strings.TrimSpace(model) == "" {
model = "openrouter/auto"
}
return openRouterClient{
httpClient: &http.Client{Timeout: 30 * time.Second},
apiKey: apiKey,
baseURL: baseURL,
defaultModel: model,
chatLogger: logging.NewChatLogger("openrouter"),
defaultTemperature: defaultTemp,
}
}
func (c openRouterClient) Chat(ctx context.Context, messages []Message, opts ...RequestOption) (string, error) {
if strings.TrimSpace(c.apiKey) == "" {
return nilStringErr("missing OpenRouter API key")
}
o := Options{Model: c.defaultModel}
for _, opt := range opts {
opt(&o)
}
if strings.TrimSpace(o.Model) == "" {
o.Model = c.defaultModel
}
start := time.Now()
c.logStart(false, o, messages)
req := buildOAChatRequest(o, messages, c.defaultTemperature, false, "llm/openrouter ")
body, err := json.Marshal(req)
if err != nil {
c.logf("marshal error: %v", err)
return "", err
}
endpoint := strings.TrimRight(c.baseURL, "/") + "/chat/completions"
logging.Logf("llm/openrouter ", "POST %s", endpoint)
resp, err := c.doJSON(ctx, endpoint, body)
if err != nil {
logging.Logf("llm/openrouter ", "%shttp error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return "", err
}
defer resp.Body.Close()
if err := handleOpenAINon2xx(resp, start, "llm/openrouter ", "openrouter"); err != nil {
return "", err
}
out, err := decodeOpenAIChat(resp, start, "llm/openrouter ")
if err != nil {
return "", err
}
if len(out.Choices) == 0 {
logging.Logf("llm/openrouter ", "%sno choices returned duration=%s%s", logging.AnsiRed, time.Since(start), logging.AnsiBase)
return "", errors.New("openrouter: no choices returned")
}
content := out.Choices[0].Message.Content
logging.Logf("llm/openrouter ", "success choice=0 finish=%s size=%d preview=%s%s%s duration=%s", out.Choices[0].FinishReason, len(content), logging.AnsiGreen, logging.PreviewForLog(content), logging.AnsiBase, time.Since(start))
return content, nil
}
func (c openRouterClient) Name() string { return "openrouter" }
func (c openRouterClient) DefaultModel() string { return c.defaultModel }
func (c openRouterClient) ChatStream(ctx context.Context, messages []Message, onDelta func(string), opts ...RequestOption) error {
if strings.TrimSpace(c.apiKey) == "" {
return errors.New("missing OpenRouter API key")
}
o := Options{Model: c.defaultModel}
for _, opt := range opts {
opt(&o)
}
if strings.TrimSpace(o.Model) == "" {
o.Model = c.defaultModel
}
start := time.Now()
c.logStart(true, o, messages)
req := buildOAChatRequest(o, messages, c.defaultTemperature, true, "llm/openrouter ")
body, err := json.Marshal(req)
if err != nil {
c.logf("marshal error: %v", err)
return err
}
endpoint := strings.TrimRight(c.baseURL, "/") + "/chat/completions"
logging.Logf("llm/openrouter ", "POST %s (stream)", endpoint)
resp, err := c.doJSONWithAccept(ctx, endpoint, body, "text/event-stream")
if err != nil {
logging.Logf("llm/openrouter ", "%shttp error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return err
}
defer resp.Body.Close()
if err := handleOpenAINon2xx(resp, start, "llm/openrouter ", "openrouter"); err != nil {
return err
}
if err := parseOpenAIStream(resp, start, onDelta, "llm/openrouter ", "openrouter"); err != nil {
return err
}
logging.Logf("llm/openrouter ", "stream end duration=%s", time.Since(start))
return nil
}
func (c openRouterClient) logf(format string, args ...any) {
logging.Logf("llm/openrouter ", format, args...)
}
func (c openRouterClient) logStart(stream bool, o Options, messages []Message) {
logMessages := make([]struct{ Role, Content string }, len(messages))
for i, m := range messages {
logMessages[i] = struct{ Role, Content string }{m.Role, m.Content}
}
c.chatLogger.LogStart(stream, o.Model, o.Temperature, o.MaxTokens, o.Stop, logMessages)
}
func (c openRouterClient) doJSON(ctx context.Context, url string, body []byte) (*http.Response, error) {
headers := map[string]string{
"Authorization": "Bearer " + c.apiKey,
"HTTP-Referer": "https://github.com/snonux/hexai",
"X-Title": "Hexai",
}
return c.doJSONWithHeaders(ctx, url, body, headers, "")
}
func (c openRouterClient) doJSONWithAccept(ctx context.Context, url string, body []byte, accept string) (*http.Response, error) {
headers := map[string]string{
"Authorization": "Bearer " + c.apiKey,
"HTTP-Referer": "https://github.com/snonux/hexai",
"X-Title": "Hexai",
}
return c.doJSONWithHeaders(ctx, url, body, headers, accept)
}
func (c openRouterClient) doJSONWithHeaders(ctx context.Context, url string, body []byte, headers map[string]string, accept string) (*http.Response, error) {
req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
if strings.TrimSpace(accept) != "" {
req.Header.Set("Accept", accept)
}
for k, v := range headers {
req.Header.Set(k, v)
}
return c.httpClient.Do(req)
}
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