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runtime.go
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runtime.go
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package gosd
import (
"bytes"
"context"
"errors"
"image"
"image/png"
"io"
"io/fs"
"log/slog"
"os"
"path/filepath"
"strings"
"github.com/dennwc/gosd/runtime"
"github.com/dennwc/gosd/runtime/types"
)
type RuntimeParams struct {
ModelDir string
EmbeddingDir string
RNG RNGType
Threads int
Type Type
Log *slog.Logger
}
func NewRuntime(p RuntimeParams) (runtime.Runtime, error) {
if p.Log == nil {
p.Log = slog.Default()
}
if _, err := os.Stat(p.ModelDir); err != nil {
return nil, err
}
return &runtimeSD{p: p, log: p.Log}, nil
}
type runtimeSD struct {
p RuntimeParams
log *slog.Logger
}
func (r *runtimeSD) ListSamplers(ctx context.Context) ([]types.SamplerInfo, error) {
var out []types.SamplerInfo
for _, s := range []SamplingMethod{
EULER_A, EULER,
HEUN, DPM2,
DPMPP2S_A, DPMPP2M,
DPMPP2Mv2, LCM,
} {
out = append(out, types.SamplerInfo{
ID: types.SamplerID(s.ID()),
Name: s.String(),
})
}
return out, nil
}
func (r *runtimeSD) ListModels(ctx context.Context) ([]types.ModelInfo, error) {
var out []types.ModelInfo
err := filepath.Walk(r.p.ModelDir, func(path string, info fs.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil // continue
}
// TODO: filter known file extensions
rel, err := filepath.Rel(r.p.ModelDir, path)
if err != nil {
return err
}
abs, err := filepath.Abs(path)
if err != nil {
return err
}
out = append(out, types.ModelInfo{
ID: types.ModelID(rel),
Name: strings.ReplaceAll(rel, string(filepath.Separator), "_"),
Title: rel,
File: abs,
})
return nil
})
return out, err
}
func (r *runtimeSD) TextToImage(ctx context.Context, p types.TextToImageParams) (image.Image, error) {
model := string(p.Model)
model = filepath.Clean(model)
c, err := New(Params{
ModelPath: filepath.Join(r.p.ModelDir, model),
EmbeddingDir: r.p.EmbeddingDir,
FreeImmediately: true,
Threads: r.p.Threads,
Type: r.p.Type,
RNG: r.p.RNG,
Schedule: ScheduleDefault,
Log: r.log,
})
if err != nil {
return nil, err
}
defer c.Close()
var sampler SamplingMethod
switch p.Sampler {
case "", types.SamplerEuler:
sampler = EULER
default:
sampler, err = ParseSamplingMethod(string(p.Sampler))
if err != nil {
return nil, err
}
}
imgs, err := c.TextToImages(TextToImageParams{
Prompt: p.Prompt,
Negative: p.Negative,
ClipSkip: p.ClipSkip,
CfgScale: p.CfgScale,
Width: p.Width,
Height: p.Height,
Sampling: sampler,
Steps: p.Steps,
BatchCount: 1,
Seed: p.Seed,
})
if err != nil {
return nil, err
}
if len(imgs) == 0 || imgs[0] == nil {
return nil, errors.New("no image returned")
}
return imgs[0], nil
}
func (r *runtimeSD) TextToImagePNG(ctx context.Context, p types.TextToImageParams) (io.ReadCloser, error) {
img, err := r.TextToImage(ctx, p)
if err != nil {
return nil, err
}
var buf bytes.Buffer
if err := png.Encode(&buf, img); err != nil {
return nil, err
}
return io.NopCloser(&buf), nil
}
func (r *runtimeSD) Close() {}