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|
package ollama
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"log/slog"
"net/http"
"time"
"within.website/x/valid"
"within.website/x/web"
)
type Client struct {
baseURL string
}
func NewClient(baseURL string) *Client {
return &Client{
baseURL: baseURL,
}
}
func NewLocalClient() *Client {
return NewClient("http://localhost:11434")
}
type Message struct {
Content string `json:"content"`
Role string `json:"role"`
Images [][]byte `json:"images"`
}
type CompleteRequest struct {
Model string `json:"model"`
Messages []Message `json:"messages"`
Format *string `json:"format,omitempty"`
Template *string `json:"template,omitempty"`
Stream bool `json:"stream"`
Options map[string]any `json:"options"`
KeepAlive time.Duration `json:"keep_alive"`
}
type CompleteResponse struct {
Model string `json:"model"`
CreatedAt time.Time `json:"created_at"`
Message Message `json:"message"`
Done bool `json:"done"`
TotalDuration float64 `json:"total_duration"`
LoadDuration float64 `json:"load_duration"`
PromptEvalCount int64 `json:"prompt_eval_count"`
PromptEvalDuration int64 `json:"prompt_eval_duration"`
EvalCount int64 `json:"eval_count"`
EvalDuration int64 `json:"eval_duration"`
}
func (c *Client) Chat(ctx context.Context, inp *CompleteRequest) (*CompleteResponse, error) {
inp.KeepAlive = 24 * time.Hour
buf := &bytes.Buffer{}
if err := json.NewEncoder(buf).Encode(inp); err != nil {
return nil, fmt.Errorf("ollama: error encoding request: %w", err)
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL+"/api/chat", buf)
if err != nil {
return nil, fmt.Errorf("ollama: error creating request: %w", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Accept", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("ollama: error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, web.NewError(http.StatusOK, resp)
}
var result CompleteResponse
if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
return nil, fmt.Errorf("ollama: error decoding response: %w", err)
}
return &result, nil
}
// HallucinateOpts contains the options for the Hallucinate function.
type HallucinateOpts struct {
Model string `json:"model"`
Messages []Message `json:"messages"`
}
func p[T any](v T) *T {
return &v
}
// Hallucinate prompts the model to hallucinate a "valid" JSON response to the given input.
func Hallucinate[T valid.Interface](ctx context.Context, c *Client, opts HallucinateOpts) (*T, error) {
inp := &CompleteRequest{
Model: opts.Model,
Messages: opts.Messages,
KeepAlive: 24 * time.Hour,
Format: p("json"),
Stream: true,
}
tries := 0
for tries <= 5 {
tries++
ctx, cancel := context.WithCancel(ctx)
defer cancel()
buf := &bytes.Buffer{}
if err := json.NewEncoder(buf).Encode(inp); err != nil {
return nil, fmt.Errorf("ollama: error encoding request: %w", err)
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL+"/api/chat", buf)
if err != nil {
return nil, fmt.Errorf("ollama: error creating request: %w", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Accept", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("ollama: error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, web.NewError(http.StatusOK, resp)
}
whitespaceCount := 0
dec := json.NewDecoder(resp.Body)
buf = bytes.NewBuffer(nil)
for {
var cr CompleteResponse
err := dec.Decode(&cr)
if err != nil {
if !errors.Is(err, io.EOF) {
return nil, fmt.Errorf("ollama: error decoding response: %w", err)
} else {
break
}
}
//slog.Debug("got response", "response", cr.Message.Content)
if _, err := fmt.Fprint(buf, cr.Message.Content); err != nil {
return nil, fmt.Errorf("ollama: error writing response to buffer: %w", err)
}
for _, r := range cr.Message.Content {
if r == '\n' {
whitespaceCount++
}
}
if whitespaceCount > 10 {
cancel()
}
//slog.Debug("buffer is now", "buffer", buf.String())
var result T
if err := json.NewDecoder(bytes.NewBuffer(buf.Bytes())).Decode(&result); err != nil {
//slog.Debug("error decoding response", "err", err)
continue
}
if err := result.Valid(); err != nil {
slog.Debug("error validating response", "err", err)
continue
}
//slog.Debug("got valid response", "response", result)
cancel()
return &result, nil
}
}
return nil, fmt.Errorf("ollama: failed to hallucinate a valid response after 5 tries")
}
|
