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// Summary: Ollama client against a local server; supports chat responses and streaming via /api/chat.
// Not yet reviewed by a human
package llm
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"strings"
"time"
"hexai/internal/logging"
)
// ollamaClient implements Client against a local Ollama server.
type ollamaClient struct {
httpClient *http.Client
baseURL string
defaultModel string
chatLogger logging.ChatLogger
defaultTemperature *float64
}
type ollamaChatRequest struct {
Model string `json:"model"`
Messages []oaMessage `json:"messages"`
Stream bool `json:"stream"`
Options any `json:"options,omitempty"`
}
type ollamaChatResponse struct {
Message struct {
Role string `json:"role"`
Content string `json:"content"`
} `json:"message"`
Done bool `json:"done"`
Error string `json:"error,omitempty"`
}
// Constructor (kept among the first functions by convention)
func newOllama(baseURL, model string, defaultTemp *float64) Client {
if strings.TrimSpace(baseURL) == "" {
baseURL = "http://localhost:11434"
}
if strings.TrimSpace(model) == "" {
model = "qwen3-coder:30b-a3b-q4_K_M`"
}
return ollamaClient{
httpClient: &http.Client{Timeout: 30 * time.Second},
baseURL: strings.TrimRight(baseURL, "/"),
defaultModel: model,
chatLogger: logging.NewChatLogger("ollama"),
defaultTemperature: defaultTemp,
}
}
// TODO: This function is too long and should be refactored for readability and maintainability.
func (c ollamaClient) Chat(ctx context.Context, messages []Message, opts ...RequestOption) (string, error) {
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 string
Content string
}, len(messages))
for i, m := range messages {
logMessages[i] = struct {
Role string
Content string
}{Role: m.Role, Content: m.Content}
}
c.chatLogger.LogStart(false, o.Model, o.Temperature, o.MaxTokens, o.Stop, logMessages)
req := ollamaChatRequest{Model: o.Model, Stream: false}
req.Messages = make([]oaMessage, len(messages))
for i, m := range messages {
req.Messages[i] = oaMessage{Role: m.Role, Content: m.Content}
}
// Build options map only if any option is set
optsMap := map[string]any{}
if o.Temperature != 0 {
optsMap["temperature"] = o.Temperature
} else if c.defaultTemperature != nil {
optsMap["temperature"] = *c.defaultTemperature
}
if o.MaxTokens > 0 {
optsMap["num_predict"] = o.MaxTokens
}
if len(o.Stop) > 0 {
optsMap["stop"] = o.Stop
}
if len(optsMap) > 0 {
req.Options = optsMap
}
body, err := json.Marshal(req)
if err != nil {
return "", err
}
endpoint := c.baseURL + "/api/chat"
logging.Logf("llm/ollama ", "POST %s", endpoint)
httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, bytes.NewReader(body))
if err != nil {
return "", err
}
httpReq.Header.Set("Content-Type", "application/json")
resp, err := c.httpClient.Do(httpReq)
if err != nil {
logging.Logf("llm/ollama ", "%shttp error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return "", err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
var apiErr ollamaChatResponse
_ = json.NewDecoder(resp.Body).Decode(&apiErr)
if strings.TrimSpace(apiErr.Error) != "" {
logging.Logf("llm/ollama ", "%sapi error status=%d msg=%s duration=%s%s", logging.AnsiRed, resp.StatusCode, apiErr.Error, time.Since(start), logging.AnsiBase)
return "", fmt.Errorf("ollama error: %s (status %d)", apiErr.Error, resp.StatusCode)
}
logging.Logf("llm/ollama ", "%shttp non-2xx status=%d duration=%s%s", logging.AnsiRed, resp.StatusCode, time.Since(start), logging.AnsiBase)
return "", fmt.Errorf("ollama http error: status %d", resp.StatusCode)
}
var out ollamaChatResponse
if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
logging.Logf("llm/ollama ", "%sdecode error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return "", err
}
if strings.TrimSpace(out.Message.Content) == "" {
logging.Logf("llm/ollama ", "%sempty content returned duration=%s%s", logging.AnsiRed, time.Since(start), logging.AnsiBase)
return "", errors.New("ollama: empty content")
}
content := out.Message.Content
logging.Logf("llm/ollama ", "success size=%d preview=%s%s%s duration=%s", len(content), logging.AnsiGreen, logging.PreviewForLog(content), logging.AnsiBase, time.Since(start))
return content, nil
}
// Provider metadata
func (c ollamaClient) Name() string { return "ollama" }
func (c ollamaClient) DefaultModel() string { return c.defaultModel }
// Streaming support (optional)
func (c ollamaClient) ChatStream(ctx context.Context, messages []Message, onDelta func(string), opts ...RequestOption) error {
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 string
Content string
}, len(messages))
for i, m := range messages {
logMessages[i] = struct {
Role string
Content string
}{Role: m.Role, Content: m.Content}
}
c.chatLogger.LogStart(true, o.Model, o.Temperature, o.MaxTokens, o.Stop, logMessages)
req := ollamaChatRequest{Model: o.Model, Stream: true}
req.Messages = make([]oaMessage, len(messages))
for i, m := range messages {
req.Messages[i] = oaMessage{Role: m.Role, Content: m.Content}
}
// Build options map
optsMap := map[string]any{}
if o.Temperature != 0 {
optsMap["temperature"] = o.Temperature
} else if c.defaultTemperature != nil {
optsMap["temperature"] = *c.defaultTemperature
}
if o.MaxTokens > 0 {
optsMap["num_predict"] = o.MaxTokens
}
if len(o.Stop) > 0 {
optsMap["stop"] = o.Stop
}
if len(optsMap) > 0 {
req.Options = optsMap
}
body, err := json.Marshal(req)
if err != nil {
return err
}
endpoint := c.baseURL + "/api/chat"
logging.Logf("llm/ollama ", "POST %s (stream)", endpoint)
httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, bytes.NewReader(body))
if err != nil {
return err
}
httpReq.Header.Set("Content-Type", "application/json")
resp, err := c.httpClient.Do(httpReq)
if err != nil {
logging.Logf("llm/ollama ", "%shttp error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
var apiErr ollamaChatResponse
_ = json.NewDecoder(resp.Body).Decode(&apiErr)
if strings.TrimSpace(apiErr.Error) != "" {
logging.Logf("llm/ollama ", "%sapi error status=%d msg=%s duration=%s%s", logging.AnsiRed, resp.StatusCode, apiErr.Error, time.Since(start), logging.AnsiBase)
return fmt.Errorf("ollama error: %s (status %d)", apiErr.Error, resp.StatusCode)
}
logging.Logf("llm/ollama ", "%shttp non-2xx status=%d duration=%s%s", logging.AnsiRed, resp.StatusCode, time.Since(start), logging.AnsiBase)
return fmt.Errorf("ollama http error: status %d", resp.StatusCode)
}
dec := json.NewDecoder(resp.Body)
for {
var ev ollamaChatResponse
if err := dec.Decode(&ev); err != nil {
if errors.Is(err, io.EOF) {
break
}
logging.Logf("llm/ollama ", "%sdecode stream error after %s: %v%s", logging.AnsiRed, time.Since(start), err, logging.AnsiBase)
return err
}
if strings.TrimSpace(ev.Error) != "" {
logging.Logf("llm/ollama ", "%sstream event error: %s%s", logging.AnsiRed, ev.Error, logging.AnsiBase)
return fmt.Errorf("ollama stream error: %s", ev.Error)
}
if s := ev.Message.Content; strings.TrimSpace(s) != "" {
onDelta(s)
}
if ev.Done {
break
}
}
logging.Logf("llm/ollama ", "stream end duration=%s", time.Since(start))
return nil
}
|
