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// Summary: GitHub Copilot client implementation for chat completions using the Copilot API.
package llm
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"time"
appver "hexai/internal"
"hexai/internal/logging"
)
// copilotClient implements Client against GitHub Copilot's Chat Completions API.
type copilotClient struct {
httpClient *http.Client
apiKey string
baseURL string
defaultModel string
chatLogger logging.ChatLogger
defaultTemperature *float64
}
type copilotChatRequest struct {
Model string `json:"model"`
Messages []copilotMessage `json:"messages"`
Temperature *float64 `json:"temperature,omitempty"`
MaxTokens *int `json:"max_tokens,omitempty"`
Stop []string `json:"stop,omitempty"`
}
type copilotMessage struct {
Role string `json:"role"`
Content string `json:"content"`
}
type copilotChatResponse struct {
Choices []struct {
Index int `json:"index"`
Message struct {
Role string `json:"role"`
Content string `json:"content"`
} `json:"message"`
FinishReason string `json:"finish_reason"`
} `json:"choices"`
Error *struct {
Message string `json:"message"`
Type string `json:"type"`
Param any `json:"param"`
Code any `json:"code"`
} `json:"error,omitempty"`
}
// Constructor (kept among the first functions by convention)
func newCopilot(baseURL, model, apiKey string, defaultTemp *float64) Client {
if strings.TrimSpace(baseURL) == "" {
baseURL = "https://api.githubcopilot.com"
}
if strings.TrimSpace(model) == "" {
// GitHub Models (Copilot API) commonly supports gpt-4o/gpt-4o-mini.
// Default to a broadly available, cost-effective option.
model = "gpt-4o-mini"
}
return copilotClient{
httpClient: &http.Client{Timeout: 30 * time.Second},
apiKey: apiKey,
baseURL: strings.TrimRight(baseURL, "/"),
defaultModel: model,
chatLogger: logging.NewChatLogger("copilot"),
defaultTemperature: defaultTemp,
}
}
func (c copilotClient) Chat(ctx context.Context, messages []Message, opts ...RequestOption) (string, error) {
if strings.TrimSpace(c.apiKey) == "" {
return nilStringErr("missing Copilot API key")
}
o := Options{Model: c.defaultModel}
for _, opt := range opts {
opt(&o)
}
if o.Model == "" {
o.Model = c.defaultModel
}
start := time.Now()
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(false, o.Model, o.Temperature, o.MaxTokens, o.Stop, logMessages)
req := buildCopilotChatRequest(o, messages, c.defaultTemperature)
body, err := json.Marshal(req)
if err != nil {
logging.Logf("llm/copilot ", "marshal error: %v", err)
return "", err
}
endpoint := c.baseURL + "/chat/completions"
logging.Logf("llm/copilot ", "POST %s", endpoint)
resp, err := c.doJSON(ctx, endpoint, body, map[string]string{
"Authorization": "Bearer " + c.apiKey,
})
if err != nil {
logging.Logf("llm/copilot ", "%shttp error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return "", err
}
defer resp.Body.Close()
if err := handleCopilotNon2xx(resp, start); err != nil {
return "", err
}
out, err := decodeCopilotChat(resp, start)
if err != nil {
return "", err
}
if len(out.Choices) == 0 {
logging.Logf("llm/copilot ", "%sno choices returned duration=%s%s", logging.AnsiRed, time.Since(start), logging.AnsiBase)
return "", errors.New("copilot: no choices returned")
}
content := out.Choices[0].Message.Content
logging.Logf("llm/copilot ", "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
}
// Provider metadata
func (c copilotClient) Name() string { return "copilot" }
func (c copilotClient) DefaultModel() string { return c.defaultModel }
// helpers
func buildCopilotChatRequest(o Options, messages []Message, defaultTemp *float64) copilotChatRequest {
req := copilotChatRequest{Model: o.Model}
req.Messages = make([]copilotMessage, len(messages))
for i, m := range messages {
req.Messages[i] = copilotMessage{Role: m.Role, Content: m.Content}
}
if o.Temperature != 0 {
req.Temperature = &o.Temperature
} else if defaultTemp != nil {
t := *defaultTemp
req.Temperature = &t
}
if o.MaxTokens > 0 {
req.MaxTokens = &o.MaxTokens
}
if len(o.Stop) > 0 {
req.Stop = o.Stop
}
return req
}
func (c copilotClient) doJSON(ctx context.Context, url string, body []byte, headers map[string]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")
// GitHub Copilot (GitHub Models) requires an API version header and a UA.
req.Header.Set("Accept", "application/json")
req.Header.Set("X-GitHub-Api-Version", "2023-07-07")
req.Header.Set("User-Agent", "hexai/"+appver.Version)
for k, v := range headers {
req.Header.Set(k, v)
}
return c.httpClient.Do(req)
}
func handleCopilotNon2xx(resp *http.Response, start time.Time) error {
if resp.StatusCode >= 200 && resp.StatusCode < 300 {
return nil
}
var apiErr copilotChatResponse
_ = json.NewDecoder(resp.Body).Decode(&apiErr)
if apiErr.Error != nil && strings.TrimSpace(apiErr.Error.Message) != "" {
logging.Logf("llm/copilot ", "%sapi error status=%d type=%s msg=%s duration=%s%s", logging.AnsiRed, resp.StatusCode, apiErr.Error.Type, apiErr.Error.Message, time.Since(start), logging.AnsiBase)
return fmt.Errorf("copilot error: %s (status %d)", apiErr.Error.Message, resp.StatusCode)
}
logging.Logf("llm/copilot ", "%shttp non-2xx status=%d duration=%s%s", logging.AnsiRed, resp.StatusCode, time.Since(start), logging.AnsiBase)
return fmt.Errorf("copilot http error: status %d", resp.StatusCode)
}
func decodeCopilotChat(resp *http.Response, start time.Time) (copilotChatResponse, error) {
var out copilotChatResponse
if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
logging.Logf("llm/copilot ", "%sdecode error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return copilotChatResponse{}, err
}
return out, nil
}
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