Gmarker689
6bda5a1f35
- 去掉 response_format 参数（API 默认返回 URL，自动下载） - Resolution 参数覆盖 API 调用尺寸（不再仅 mock 路径生效） - parseImageResponse 改为动态 width/height 入参 - 新增 tools/gentest.go 生成测试脚本 - .gitignore 忽略 test_output/
306 lines
9.1 KiB
Go
306 lines
9.1 KiB
Go
package service
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import (
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"bytes"
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"context"
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"crypto/rand"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"image"
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"image/color"
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"image/png"
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"io"
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"log"
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"mime/multipart"
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"net/http"
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"strconv"
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"strings"
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"gen2d/internal/config"
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)
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// imgCfg 保存文生图配置，由 main 通过 InitImageGenConfig 注入。
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var imgCfg config.ImageGenConfig
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// InitImageGenConfig 注入文生图配置。
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func InitImageGenConfig(cfg config.ImageGenConfig) {
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imgCfg = cfg
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}
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// ======================== 文生图 API 调用层 ========================
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// imageGenRequest OpenAI 兼容的文生图请求体。
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type imageGenRequest struct {
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Model string `json:"model"`
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Prompt string `json:"prompt"`
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N int `json:"n,omitempty"`
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Size string `json:"size,omitempty"`
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Steps int `json:"steps,omitempty"`
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CFGScale float64 `json:"cfg_scale,omitempty"`
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}
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// imageGenResponse OpenAI 兼容的文生图响应体。
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type imageGenResponse struct {
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Data []struct {
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URL string `json:"url"`
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B64JSON string `json:"b64_json"`
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} `json:"data"`
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}
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// GenerateImages 调用 AI 推理 API 生成图片，未配置 API key 时回退到 mock。
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func GenerateImages(ctx context.Context, prompt string, params AssetParams) ([]GeneratedImage, error) {
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count := 1
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if params.Frames.Directions > 0 && params.Frames.FramesPerDirection > 0 {
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count = params.Frames.Directions * params.Frames.FramesPerDirection
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}
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if imgCfg.APIKey != "" {
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width, height := imgCfg.Width, imgCfg.Height
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if params.Resolution > 0 {
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width = params.Resolution
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height = params.Resolution
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}
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return callImageGenAPI(ctx, prompt, count, width, height)
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}
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size := params.Resolution
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if size <= 0 {
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size = 64
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}
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log.Println("[inference] ImageGen API key not configured, using mock")
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return generateMockImages(size, count)
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}
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// callImageGenAPI 调用 OpenAI 兼容的 Images API，返回生成的图片。
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func callImageGenAPI(ctx context.Context, prompt string, count, width, height int) ([]GeneratedImage, error) {
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reqBody := imageGenRequest{
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Model: imgCfg.Model,
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Prompt: prompt,
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N: count,
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Size: fmt.Sprintf("%dx%d", width, height),
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}
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if imgCfg.Steps > 0 {
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reqBody.Steps = imgCfg.Steps
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}
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if imgCfg.CFGScale > 0 {
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reqBody.CFGScale = imgCfg.CFGScale
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}
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body, err := json.Marshal(reqBody)
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if err != nil {
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return nil, fmt.Errorf("marshal request: %w", err)
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}
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url := strings.TrimRight(imgCfg.BaseURL, "/")
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
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if err != nil {
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return nil, fmt.Errorf("create request: %w", err)
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Authorization", "Bearer "+imgCfg.APIKey)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("send request: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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b, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
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return nil, fmt.Errorf("image gen api error %d: %s", resp.StatusCode, string(b))
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}
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return parseImageResponse(ctx, resp.Body, width, height)
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}
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// ======================== 图片编辑 API ========================
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// EditImages 调用图片编辑 API，基于已有图片和文本提示词生成修改后的图片。
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func EditImages(ctx context.Context, imageData []byte, prompt string, count int) ([]GeneratedImage, error) {
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if imgCfg.APIKey == "" {
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return nil, fmt.Errorf("image edit API key not configured")
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}
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return callImageEditAPI(ctx, imageData, prompt, count)
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}
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// callImageEditAPI 调用 OpenAI 兼容的 Images Edits API（multipart/form-data）。
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func callImageEditAPI(ctx context.Context, imageData []byte, prompt string, count int) ([]GeneratedImage, error) {
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var buf bytes.Buffer
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writer := multipart.NewWriter(&buf)
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part, err := writer.CreateFormFile("image", "image.png")
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if err != nil {
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return nil, fmt.Errorf("create form file: %w", err)
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}
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if _, err := part.Write(imageData); err != nil {
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return nil, fmt.Errorf("write image data: %w", err)
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}
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writer.WriteField("prompt", prompt)
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writer.WriteField("model", imgCfg.Model)
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writer.WriteField("n", strconv.Itoa(count))
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writer.WriteField("size", fmt.Sprintf("%dx%d", imgCfg.Width, imgCfg.Height))
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if err := writer.Close(); err != nil {
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return nil, fmt.Errorf("close multipart writer: %w", err)
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}
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url := strings.Replace(strings.TrimRight(imgCfg.BaseURL, "/"), "generations", "edits", 1)
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, &buf)
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if err != nil {
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return nil, fmt.Errorf("create request: %w", err)
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}
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req.Header.Set("Content-Type", writer.FormDataContentType())
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req.Header.Set("Authorization", "Bearer "+imgCfg.APIKey)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("send request: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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b, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
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return nil, fmt.Errorf("image edit api error %d: %s", resp.StatusCode, string(b))
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}
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return parseImageResponse(ctx, resp.Body, imgCfg.Width, imgCfg.Height)
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}
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// parseImageResponse 解析 OpenAI 兼容的图片生成/编辑响应体。
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func parseImageResponse(ctx context.Context, r io.Reader, width, height int) ([]GeneratedImage, error) {
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var genResp imageGenResponse
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if err := json.NewDecoder(r).Decode(&genResp); err != nil {
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return nil, fmt.Errorf("decode response: %w", err)
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}
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images := make([]GeneratedImage, 0, len(genResp.Data))
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for i, d := range genResp.Data {
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var data []byte
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switch {
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case d.B64JSON != "":
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var err error
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data, err = base64.StdEncoding.DecodeString(d.B64JSON)
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if err != nil {
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return nil, fmt.Errorf("decode base64 image %d: %w", i, err)
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}
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case d.URL != "":
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var err error
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data, err = downloadImage(ctx, d.URL)
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if err != nil {
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return nil, fmt.Errorf("download image %d: %w", i, err)
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}
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default:
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return nil, fmt.Errorf("image %d: no data or url in response", i)
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}
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images = append(images, GeneratedImage{
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Data: data,
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Width: width,
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Height: height,
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Format: "png",
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})
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}
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return images, nil
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}
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// downloadImage 从 URL 下载图片数据。
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func downloadImage(ctx context.Context, url string) ([]byte, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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return nil, fmt.Errorf("create download request: %w", err)
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("download: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("download status %d", resp.StatusCode)
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}
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return io.ReadAll(resp.Body)
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}
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// ======================== 质检 ========================
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// QualityChecker 质检函数，可替换用于测试。
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var QualityChecker = defaultCheckQuality
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// CheckQuality 调用当前 QualityChecker。
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func CheckQuality(ctx context.Context, images []GeneratedImage, style map[string]string) (bool, string, error) {
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return QualityChecker(ctx, images, style)
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}
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// defaultCheckQuality 默认 mock 质检，始终返回 pass。
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func defaultCheckQuality(ctx context.Context, images []GeneratedImage, style map[string]string) (bool, string, error) {
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return true, "", nil
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}
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// NewCountedQualityChecker 创建一个在第 passOnRetry 次调用时返回 pass 的质检函数。
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func NewCountedQualityChecker(passOnRetry int) func(context.Context, []GeneratedImage, map[string]string) (bool, string, error) {
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var callCount int
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return func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
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callCount++
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if callCount >= passOnRetry {
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return true, "", nil
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}
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return false, fmt.Sprintf("风格不一致（第 %d 次质检）", callCount), nil
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}
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}
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// AlwaysFailQualityChecker 始终返回 fail 的质检函数。
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func AlwaysFailQualityChecker() func(context.Context, []GeneratedImage, map[string]string) (bool, string, error) {
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return func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
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return false, "风格不一致", nil
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}
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}
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// ======================== Mock 回退 ========================
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// generateMockImages 批量生成 mock PNG 占位图。
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func generateMockImages(size, count int) ([]GeneratedImage, error) {
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images := make([]GeneratedImage, count)
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for i := 0; i < count; i++ {
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data, err := generateMockImage(size, i)
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if err != nil {
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return nil, fmt.Errorf("generate mock image %d: %w", i, err)
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}
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images[i] = GeneratedImage{
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Data: data,
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Width: size,
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Height: size,
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Format: "png",
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}
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}
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return images, nil
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}
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// generateMockImage 生成一张带随机色块的 PNG 占位图。
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func generateMockImage(size int, seed int) ([]byte, error) {
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img := image.NewRGBA(image.Rect(0, 0, size, size))
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r := uint8((seed*47 + 13) % 256)
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g := uint8((seed*83 + 37) % 256)
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b := uint8((seed*61 + 71) % 256)
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for y := 0; y < size; y++ {
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for x := 0; x < size; x++ {
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img.Set(x, y, color.RGBA{R: r, G: g, B: b, A: 255})
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}
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}
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var buf bytes.Buffer
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if err := png.Encode(&buf, img); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// generateRandomBytes 用于生成随机数据（备用）。
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func generateRandomBytes(n int) ([]byte, error) {
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b := make([]byte, n)
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_, err := rand.Read(b)
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return b, err
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}
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