128 lines
2.9 KiB
Go
128 lines
2.9 KiB
Go
package server
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"os"
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"path"
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"strconv"
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)
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const directoryURL = "https://ollama.ai/api/models"
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type Model struct {
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Name string `json:"name"`
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DisplayName string `json:"display_name"`
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Parameters string `json:"parameters"`
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URL string `json:"url"`
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ShortDescription string `json:"short_description"`
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Description string `json:"description"`
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PublishedBy string `json:"published_by"`
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OriginalAuthor string `json:"original_author"`
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OriginalURL string `json:"original_url"`
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License string `json:"license"`
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}
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func (m *Model) FullName() string {
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home, err := os.UserHomeDir()
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if err != nil {
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panic(err)
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}
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return path.Join(home, ".ollama", "models", m.Name+".bin")
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}
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func (m *Model) TempFile() string {
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fullName := m.FullName()
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return path.Join(
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path.Dir(fullName),
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fmt.Sprintf(".%s.part", path.Base(fullName)),
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)
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}
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func getRemote(model string) (*Model, error) {
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// resolve the model download from our directory
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resp, err := http.Get(directoryURL)
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if err != nil {
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return nil, fmt.Errorf("failed to get directory: %w", err)
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read directory: %w", err)
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}
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var models []Model
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err = json.Unmarshal(body, &models)
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if err != nil {
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return nil, fmt.Errorf("failed to parse directory: %w", err)
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}
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for _, m := range models {
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if m.Name == model {
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return &m, nil
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}
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}
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return nil, fmt.Errorf("model not found in directory: %s", model)
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}
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func saveModel(model *Model, fn func(total, completed int64)) error {
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// this models cache directory is created by the server on startup
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client := &http.Client{}
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req, err := http.NewRequest("GET", model.URL, nil)
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if err != nil {
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return fmt.Errorf("failed to download model: %w", err)
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}
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var size int64
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// completed file doesn't exist, check partial file
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fi, err := os.Stat(model.TempFile())
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switch {
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case errors.Is(err, os.ErrNotExist):
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// noop, file doesn't exist so create it
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case err != nil:
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return fmt.Errorf("stat: %w", err)
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default:
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size = fi.Size()
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}
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req.Header.Add("Range", fmt.Sprintf("bytes=%d-", size))
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resp, err := client.Do(req)
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if err != nil {
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return fmt.Errorf("failed to download model: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode >= 400 {
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return fmt.Errorf("failed to download model: %s", resp.Status)
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}
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out, err := os.OpenFile(model.TempFile(), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
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if err != nil {
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panic(err)
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}
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defer out.Close()
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remaining, _ := strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64)
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completed := size
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total := remaining + completed
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for {
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fn(total, completed)
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if completed >= total {
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return os.Rename(model.TempFile(), model.FullName())
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}
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n , err := io.CopyN(out, resp.Body, 8192)
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if err != nil && !errors.Is(err, io.EOF) {
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return err
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}
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completed += n
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}
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}
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