routes.go 31.5 KB
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package server

import (
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	"context"
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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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	"io/fs"
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	"log/slog"
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	"net"
	"net/http"
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	"os"
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	"os/signal"
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	"path/filepath"
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	"reflect"
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	"runtime"
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	"strings"
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	"sync"
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	"syscall"
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	"time"
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	"github.com/gin-contrib/cors"
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	"github.com/gin-gonic/gin"
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	"golang.org/x/exp/slices"
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	"github.com/jmorganca/ollama/api"
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	"github.com/jmorganca/ollama/gpu"
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	"github.com/jmorganca/ollama/llm"
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	"github.com/jmorganca/ollama/openai"
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	"github.com/jmorganca/ollama/parser"
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	"github.com/jmorganca/ollama/version"
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)

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var mode string = gin.DebugMode

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type Server struct {
	WorkDir string
}

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func init() {
	switch mode {
	case gin.DebugMode:
	case gin.ReleaseMode:
	case gin.TestMode:
	default:
		mode = gin.DebugMode
	}

	gin.SetMode(mode)
}

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var loaded struct {
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	mu sync.Mutex

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	runner llm.LLM
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	expireAt    time.Time
	expireTimer *time.Timer
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	*Model
	*api.Options
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}

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var defaultSessionDuration = 5 * time.Minute

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// load a model into memory if it is not already loaded, it is up to the caller to lock loaded.mu before calling this function
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func load(c *gin.Context, model *Model, opts api.Options, sessionDuration time.Duration) error {
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	workDir := c.GetString("workDir")

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	needLoad := loaded.runner == nil || // is there a model loaded?
		loaded.ModelPath != model.ModelPath || // has the base model changed?
		!reflect.DeepEqual(loaded.AdapterPaths, model.AdapterPaths) || // have the adapters changed?
		!reflect.DeepEqual(loaded.Options.Runner, opts.Runner) // have the runner options changed?

	if needLoad {
		if loaded.runner != nil {
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			slog.Info("changing loaded model")
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			loaded.runner.Close()
			loaded.runner = nil
			loaded.Model = nil
			loaded.Options = nil
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		}
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		llmRunner, err := llm.New(workDir, model.ModelPath, model.AdapterPaths, model.ProjectorPaths, opts)
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		if err != nil {
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			// some older models are not compatible with newer versions of llama.cpp
			// show a generalized compatibility error until there is a better way to
			// check for model compatibility
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			if errors.Is(llm.ErrUnsupportedFormat, err) || strings.Contains(err.Error(), "failed to load model") {
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				err = fmt.Errorf("%v: this model may be incompatible with your version of Ollama. If you previously pulled this model, try updating it by running `ollama pull %s`", err, model.ShortName)
			}

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			return err
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		}

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		loaded.Model = model
		loaded.runner = llmRunner
		loaded.Options = &opts
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	}
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	loaded.expireAt = time.Now().Add(sessionDuration)
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	if loaded.expireTimer == nil {
		loaded.expireTimer = time.AfterFunc(sessionDuration, func() {
			loaded.mu.Lock()
			defer loaded.mu.Unlock()
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			if time.Now().Before(loaded.expireAt) {
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				return
			}

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			if loaded.runner != nil {
				loaded.runner.Close()
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			}

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			loaded.runner = nil
			loaded.Model = nil
			loaded.Options = nil
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		})
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	}
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	loaded.expireTimer.Reset(sessionDuration)
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	return nil
}

func modelOptions(model *Model, requestOpts map[string]interface{}) (api.Options, error) {
	opts := api.DefaultOptions()
	if err := opts.FromMap(model.Options); err != nil {
		return api.Options{}, err
	}

	if err := opts.FromMap(requestOpts); err != nil {
		return api.Options{}, err
	}

	return opts, nil
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}

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func isSupportedImageType(image []byte) bool {
	contentType := http.DetectContentType(image)
	allowedTypes := []string{"image/jpeg", "image/jpg", "image/png"}
	return slices.Contains(allowedTypes, contentType)
}

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func GenerateHandler(c *gin.Context) {
	loaded.mu.Lock()
	defer loaded.mu.Unlock()

	checkpointStart := time.Now()
	var req api.GenerateRequest
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	err := c.ShouldBindJSON(&req)
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	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
	}

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	// validate the request
	switch {
	case req.Model == "":
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		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
		return
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	case len(req.Format) > 0 && req.Format != "json":
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "format must be json"})
		return
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	case req.Raw && (req.Template != "" || req.System != "" || len(req.Context) > 0):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "raw mode does not support template, system, or context"})
		return
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	}

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	for _, img := range req.Images {
		if !isSupportedImageType(img) {
			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "unsupported image format"})
			return
		}
	}

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	model, err := GetModel(req.Model)
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	if err != nil {
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		var pErr *fs.PathError
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		if errors.As(err, &pErr) {
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			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found, try pulling it first", req.Model)})
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			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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	if model.IsEmbedding() {
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		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "embedding models do not support generate"})
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		return
	}

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	opts, err := modelOptions(model, req.Options)
	if err != nil {
		if errors.Is(err, api.ErrInvalidOpts) {
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			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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			return
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		}
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		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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	var sessionDuration time.Duration
	if req.KeepAlive == nil {
		sessionDuration = defaultSessionDuration
	} else {
		sessionDuration = req.KeepAlive.Duration
	}

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	if err := load(c, model, opts, sessionDuration); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
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		return
	}

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	// an empty request loads the model
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	// note: for a short while template was used in lieu
	// of `raw` mode so we need to check for it too
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	if req.Prompt == "" && req.Template == "" && req.System == "" {
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		c.JSON(http.StatusOK, api.GenerateResponse{
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			CreatedAt: time.Now().UTC(),
			Model:     req.Model,
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			Done:      true,
		})
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		return
	}

	checkpointLoaded := time.Now()

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	var prompt string
	switch {
	case req.Raw:
		prompt = req.Prompt
	case req.Prompt != "":
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		if req.Template == "" {
			req.Template = model.Template
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		}

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		if req.System == "" {
			req.System = model.System
		}

		slog.Debug("generate handler", "prompt", req.Prompt)
		slog.Debug("generate handler", "template", req.Template)
		slog.Debug("generate handler", "system", req.System)

		var sb strings.Builder
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		for i := range req.Images {
			fmt.Fprintf(&sb, "[img-%d] ", i)
		}

		sb.WriteString(req.Prompt)

		p, err := Prompt(req.Template, req.System, sb.String(), "", true)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		sb.Reset()
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		if req.Context != nil {
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			prev, err := loaded.runner.Decode(c.Request.Context(), req.Context)
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			if err != nil {
				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
				return
			}

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			sb.WriteString(prev)
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		}

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		sb.WriteString(p)

		prompt = sb.String()
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	}

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	slog.Debug("generate handler", "prompt", prompt)
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	ch := make(chan any)
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	var generated strings.Builder
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	go func() {
		defer close(ch)

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		fn := func(r llm.PredictResult) {
			// Update model expiration
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			loaded.expireAt = time.Now().Add(sessionDuration)
			loaded.expireTimer.Reset(sessionDuration)

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			// Build up the full response
			if _, err := generated.WriteString(r.Content); err != nil {
				ch <- gin.H{"error": err.Error()}
				return
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			}

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			resp := api.GenerateResponse{
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				Model:     req.Model,
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				CreatedAt: time.Now().UTC(),
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				Done:      r.Done,
				Response:  r.Content,
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				Metrics: api.Metrics{
					PromptEvalCount:    r.PromptEvalCount,
					PromptEvalDuration: r.PromptEvalDuration,
					EvalCount:          r.EvalCount,
					EvalDuration:       r.EvalDuration,
				},
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			}

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			if r.Done {
				resp.TotalDuration = time.Since(checkpointStart)
				resp.LoadDuration = checkpointLoaded.Sub(checkpointStart)

				if !req.Raw {
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					p, err := Prompt(req.Template, req.System, req.Prompt, generated.String(), false)
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					if err != nil {
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						c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
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						return
					}
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					// TODO (jmorganca): encode() should not strip special tokens
					tokens, err := loaded.runner.Encode(c.Request.Context(), p)
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					if err != nil {
						ch <- gin.H{"error": err.Error()}
						return
					}
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					resp.Context = append(req.Context, tokens...)
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				}
			}

			ch <- resp
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		}

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		var images []llm.ImageData
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		for i := range req.Images {
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			images = append(images, llm.ImageData{
				ID:   i,
				Data: req.Images[i],
			})
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		}

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		// Start prediction
		predictReq := llm.PredictOpts{
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			Prompt:  prompt,
			Format:  req.Format,
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			Images:  images,
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			Options: opts,
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		}
		if err := loaded.runner.Predict(c.Request.Context(), predictReq, fn); err != nil {
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			ch <- gin.H{"error": err.Error()}
		}
	}()

	if req.Stream != nil && !*req.Stream {
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		// Accumulate responses into the final response
		var final api.GenerateResponse
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		var sb strings.Builder
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		for resp := range ch {
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			switch r := resp.(type) {
			case api.GenerateResponse:
				sb.WriteString(r.Response)
				final = r
			case gin.H:
				if errorMsg, ok := r["error"].(string); ok {
					c.JSON(http.StatusInternalServerError, gin.H{"error": errorMsg})
					return
				} else {
					c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error format in response"})
					return
				}
			default:
				c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error"})
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				return
			}
		}
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		final.Response = sb.String()
		c.JSON(http.StatusOK, final)
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		return
	}

	streamResponse(c, ch)
}

func EmbeddingHandler(c *gin.Context) {
	loaded.mu.Lock()
	defer loaded.mu.Unlock()

	var req api.EmbeddingRequest
	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if req.Model == "" {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
		return
	}

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	model, err := GetModel(req.Model)
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	if err != nil {
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		var pErr *fs.PathError
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		if errors.As(err, &pErr) {
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			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found, try pulling it first", req.Model)})
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			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	opts, err := modelOptions(model, req.Options)
	if err != nil {
		if errors.Is(err, api.ErrInvalidOpts) {
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			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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			return
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		}
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		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
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	var sessionDuration time.Duration
	if req.KeepAlive == nil {
		sessionDuration = defaultSessionDuration
	} else {
		sessionDuration = req.KeepAlive.Duration
	}

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	if err := load(c, model, opts, sessionDuration); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
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		return
	}

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	if !loaded.Options.EmbeddingOnly {
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		c.JSON(http.StatusBadRequest, gin.H{"error": "embedding option must be set to true"})
		return
	}

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	embedding, err := loaded.runner.Embedding(c.Request.Context(), req.Prompt)
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	if err != nil {
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		slog.Info(fmt.Sprintf("embedding generation failed: %v", err))
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		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to generate embedding"})
		return
	}

	resp := api.EmbeddingResponse{
		Embedding: embedding,
	}
	c.JSON(http.StatusOK, resp)
}

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func PullModelHandler(c *gin.Context) {
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	var req api.PullRequest
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	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
	}

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	var model string
	if req.Model != "" {
		model = req.Model
	} else if req.Name != "" {
		model = req.Name
	} else {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
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		return
	}

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	ch := make(chan any)
	go func() {
		defer close(ch)
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		fn := func(r api.ProgressResponse) {
			ch <- r
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		}
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		regOpts := &registryOptions{
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			Insecure: req.Insecure,
		}

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		ctx, cancel := context.WithCancel(c.Request.Context())
		defer cancel()

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		if err := PullModel(ctx, model, regOpts, fn); err != nil {
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			ch <- gin.H{"error": err.Error()}
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		}
	}()

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	if req.Stream != nil && !*req.Stream {
		waitForStream(c, ch)
		return
	}

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	streamResponse(c, ch)
}

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func PushModelHandler(c *gin.Context) {
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	var req api.PushRequest
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	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
	}
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	var model string
	if req.Model != "" {
		model = req.Model
	} else if req.Name != "" {
		model = req.Name
	} else {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
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		return
	}

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	ch := make(chan any)
	go func() {
		defer close(ch)
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		fn := func(r api.ProgressResponse) {
			ch <- r
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		}
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		regOpts := &registryOptions{
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			Insecure: req.Insecure,
		}

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		ctx, cancel := context.WithCancel(c.Request.Context())
		defer cancel()

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		if err := PushModel(ctx, model, regOpts, fn); err != nil {
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			ch <- gin.H{"error": err.Error()}
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		}
	}()

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	if req.Stream != nil && !*req.Stream {
		waitForStream(c, ch)
		return
	}

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	streamResponse(c, ch)
}

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func CreateModelHandler(c *gin.Context) {
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	var req api.CreateRequest
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	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
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	}

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	var model string
	if req.Model != "" {
		model = req.Model
	} else if req.Name != "" {
		model = req.Name
	} else {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
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		return
	}

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	if err := ParseModelPath(model).Validate(); err != nil {
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		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
	}

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	if req.Path == "" && req.Modelfile == "" {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "path or modelfile are required"})
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		return
	}
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	var modelfile io.Reader = strings.NewReader(req.Modelfile)
	if req.Path != "" && req.Modelfile == "" {
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		mf, err := os.Open(req.Path)
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		if err != nil {
			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("error reading modelfile: %s", err)})
			return
		}
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		defer mf.Close()
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		modelfile = mf
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	}
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	commands, err := parser.Parse(modelfile)
	if err != nil {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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	ch := make(chan any)
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	go func() {
		defer close(ch)
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		fn := func(resp api.ProgressResponse) {
			ch <- resp
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		}

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		ctx, cancel := context.WithCancel(c.Request.Context())
		defer cancel()

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		if err := CreateModel(ctx, model, filepath.Dir(req.Path), commands, fn); err != nil {
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			ch <- gin.H{"error": err.Error()}
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		}
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	}()
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	if req.Stream != nil && !*req.Stream {
		waitForStream(c, ch)
		return
	}

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	streamResponse(c, ch)
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}

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func DeleteModelHandler(c *gin.Context) {
	var req api.DeleteRequest
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	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
	}

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	var model string
	if req.Model != "" {
		model = req.Model
	} else if req.Name != "" {
		model = req.Name
	} else {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
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		return
	}

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	if err := DeleteModel(model); err != nil {
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		if os.IsNotExist(err) {
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			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found", model)})
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		} else {
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			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		}
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		return
	}
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	manifestsPath, err := GetManifestPath()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	if err := PruneDirectory(manifestsPath); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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	c.JSON(http.StatusOK, nil)
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}

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func ShowModelHandler(c *gin.Context) {
	var req api.ShowRequest
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	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
	}

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	if req.Model != "" {
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		// noop
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	} else if req.Name != "" {
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		req.Model = req.Name
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	} else {
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		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
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		return
	}

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	resp, err := GetModelInfo(req)
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	if err != nil {
		if os.IsNotExist(err) {
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			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found", req.Model)})
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		} else {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		}
		return
	}

	c.JSON(http.StatusOK, resp)
}

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func GetModelInfo(req api.ShowRequest) (*api.ShowResponse, error) {
	model, err := GetModel(req.Model)
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	if err != nil {
		return nil, err
	}

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	modelDetails := api.ModelDetails{
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		ParentModel:       model.ParentModel,
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		Format:            model.Config.ModelFormat,
		Family:            model.Config.ModelFamily,
		Families:          model.Config.ModelFamilies,
		ParameterSize:     model.Config.ModelType,
		QuantizationLevel: model.Config.FileType,
	}

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	if req.System != "" {
		model.System = req.System
	}

	if req.Template != "" {
		model.Template = req.Template
	}

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	msgs := make([]api.Message, 0)
	for _, msg := range model.Messages {
		msgs = append(msgs, api.Message{Role: msg.Role, Content: msg.Content})
	}

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	resp := &api.ShowResponse{
		License:  strings.Join(model.License, "\n"),
		System:   model.System,
		Template: model.Template,
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		Details:  modelDetails,
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		Messages: msgs,
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	}

	var params []string
	cs := 30
	for k, v := range model.Options {
		switch val := v.(type) {
		case []interface{}:
			for _, nv := range val {
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				params = append(params, fmt.Sprintf("%-*s %#v", cs, k, nv))
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			}
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		default:
			params = append(params, fmt.Sprintf("%-*s %#v", cs, k, v))
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		}
	}
	resp.Parameters = strings.Join(params, "\n")

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	for k, v := range req.Options {
		if _, ok := req.Options[k]; ok {
			model.Options[k] = v
		}
	}

	mf, err := ShowModelfile(model)
	if err != nil {
		return nil, err
	}

	resp.Modelfile = mf

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	return resp, nil
}

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func ListModelsHandler(c *gin.Context) {
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	models := make([]api.ModelResponse, 0)
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	manifestsPath, err := GetManifestPath()
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	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
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	modelResponse := func(modelName string) (api.ModelResponse, error) {
		model, err := GetModel(modelName)
		if err != nil {
			return api.ModelResponse{}, err
		}

		modelDetails := api.ModelDetails{
			Format:            model.Config.ModelFormat,
			Family:            model.Config.ModelFamily,
			Families:          model.Config.ModelFamilies,
			ParameterSize:     model.Config.ModelType,
			QuantizationLevel: model.Config.FileType,
		}

		return api.ModelResponse{
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			Model:   model.ShortName,
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			Name:    model.ShortName,
			Size:    model.Size,
			Digest:  model.Digest,
			Details: modelDetails,
		}, nil
	}

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	walkFunc := func(path string, info os.FileInfo, _ error) error {
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		if !info.IsDir() {
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			path, tag := filepath.Split(path)
			model := strings.Trim(strings.TrimPrefix(path, manifestsPath), string(os.PathSeparator))
			modelPath := strings.Join([]string{model, tag}, ":")
			canonicalModelPath := strings.ReplaceAll(modelPath, string(os.PathSeparator), "/")
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			resp, err := modelResponse(canonicalModelPath)
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			if err != nil {
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				slog.Info(fmt.Sprintf("skipping file: %s", canonicalModelPath))
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				// nolint: nilerr
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				return nil
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			}
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			resp.ModifiedAt = info.ModTime()
			models = append(models, resp)
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		}
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		return nil
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	}

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	if err := filepath.Walk(manifestsPath, walkFunc); err != nil {
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		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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	c.JSON(http.StatusOK, api.ListResponse{Models: models})
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}

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func CopyModelHandler(c *gin.Context) {
	var req api.CopyRequest
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	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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		return
	}

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	if req.Source == "" || req.Destination == "" {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "source add destination are required"})
		return
	}

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	if err := ParseModelPath(req.Destination).Validate(); err != nil {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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	if err := CopyModel(req.Source, req.Destination); err != nil {
		if os.IsNotExist(err) {
			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found", req.Source)})
		} else {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		}
		return
	}
}

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func HeadBlobHandler(c *gin.Context) {
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	path, err := GetBlobsPath(c.Param("digest"))
	if err != nil {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if _, err := os.Stat(path); err != nil {
		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("blob %q not found", c.Param("digest"))})
		return
	}

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	c.Status(http.StatusOK)
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}

func CreateBlobHandler(c *gin.Context) {
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	layer, err := NewLayer(c.Request.Body, "")
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	if err != nil {
		c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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	if layer.Digest != c.Param("digest") {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("digest mismatch, expected %q, got %q", c.Param("digest"), layer.Digest)})
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		return
	}

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	if _, err := layer.Commit(); err != nil {
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		c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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	c.Status(http.StatusCreated)
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}

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var defaultAllowOrigins = []string{
	"localhost",
	"127.0.0.1",
	"0.0.0.0",
}

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func NewServer() (*Server, error) {
	workDir, err := os.MkdirTemp("", "ollama")
	if err != nil {
		return nil, err
	}
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	return &Server{
		WorkDir: workDir,
	}, nil
}
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func (s *Server) GenerateRoutes() http.Handler {
	var origins []string
	if o := os.Getenv("OLLAMA_ORIGINS"); o != "" {
		origins = strings.Split(o, ",")
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	}

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	config := cors.DefaultConfig()
	config.AllowWildcard = true
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	config.AllowBrowserExtensions = true
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	config.AllowOrigins = origins
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	for _, allowOrigin := range defaultAllowOrigins {
		config.AllowOrigins = append(config.AllowOrigins,
			fmt.Sprintf("http://%s", allowOrigin),
			fmt.Sprintf("https://%s", allowOrigin),
			fmt.Sprintf("http://%s:*", allowOrigin),
			fmt.Sprintf("https://%s:*", allowOrigin),
		)
	}
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	r := gin.Default()
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	r.Use(
		cors.New(config),
		func(c *gin.Context) {
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			c.Set("workDir", s.WorkDir)
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			c.Next()
		},
	)
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	r.POST("/api/pull", PullModelHandler)
	r.POST("/api/generate", GenerateHandler)
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	r.POST("/api/chat", ChatHandler)
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	r.POST("/api/embeddings", EmbeddingHandler)
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	r.POST("/api/create", CreateModelHandler)
	r.POST("/api/push", PushModelHandler)
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	r.POST("/api/copy", CopyModelHandler)
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	r.DELETE("/api/delete", DeleteModelHandler)
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	r.POST("/api/show", ShowModelHandler)
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	r.POST("/api/blobs/:digest", CreateBlobHandler)
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	r.HEAD("/api/blobs/:digest", HeadBlobHandler)
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	// Compatibility endpoints
	r.POST("/v1/chat/completions", openai.Middleware(), ChatHandler)

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	for _, method := range []string{http.MethodGet, http.MethodHead} {
		r.Handle(method, "/", func(c *gin.Context) {
			c.String(http.StatusOK, "Ollama is running")
		})

		r.Handle(method, "/api/tags", ListModelsHandler)
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		r.Handle(method, "/api/version", func(c *gin.Context) {
			c.JSON(http.StatusOK, gin.H{"version": version.Version})
		})
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	}

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	return r
}

func Serve(ln net.Listener) error {
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	level := slog.LevelInfo
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	if debug := os.Getenv("OLLAMA_DEBUG"); debug != "" {
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		level = slog.LevelDebug
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	}
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	handler := slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
		Level:     level,
		AddSource: true,
		ReplaceAttr: func(_ []string, attr slog.Attr) slog.Attr {
			if attr.Key == slog.SourceKey {
				source := attr.Value.Any().(*slog.Source)
				source.File = filepath.Base(source.File)
			}

			return attr
		},
	})

	slog.SetDefault(slog.New(handler))

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	if noprune := os.Getenv("OLLAMA_NOPRUNE"); noprune == "" {
		// clean up unused layers and manifests
		if err := PruneLayers(); err != nil {
			return err
		}

		manifestsPath, err := GetManifestPath()
		if err != nil {
			return err
		}

		if err := PruneDirectory(manifestsPath); err != nil {
			return err
		}
	}

	s, err := NewServer()
	if err != nil {
		return err
	}
	r := s.GenerateRoutes()

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	slog.Info(fmt.Sprintf("Listening on %s (version %s)", ln.Addr(), version.Version))
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	srvr := &http.Server{
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		Handler: r,
	}

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	// listen for a ctrl+c and stop any loaded llm
	signals := make(chan os.Signal, 1)
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	signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
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	go func() {
		<-signals
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		if loaded.runner != nil {
			loaded.runner.Close()
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		}
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		os.RemoveAll(s.WorkDir)
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		os.Exit(0)
	}()

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	if err := llm.Init(s.WorkDir); err != nil {
		return fmt.Errorf("unable to initialize llm library %w", err)
	}
	if runtime.GOOS == "linux" { // TODO - windows too
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		// check compatibility to log warnings
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		if _, err := gpu.CheckVRAM(); err != nil {
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			slog.Info(err.Error())
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		}
	}

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	return srvr.Serve(ln)
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}
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func waitForStream(c *gin.Context, ch chan interface{}) {
	c.Header("Content-Type", "application/json")
	for resp := range ch {
		switch r := resp.(type) {
		case api.ProgressResponse:
			if r.Status == "success" {
				c.JSON(http.StatusOK, r)
				return
			}
		case gin.H:
			if errorMsg, ok := r["error"].(string); ok {
				c.JSON(http.StatusInternalServerError, gin.H{"error": errorMsg})
				return
			} else {
				c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error format in progress response"})
				return
			}
		default:
			c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected progress response"})
			return
		}
	}
	c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected end of progress response"})
}

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func streamResponse(c *gin.Context, ch chan any) {
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	c.Header("Content-Type", "application/x-ndjson")
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	c.Stream(func(w io.Writer) bool {
		val, ok := <-ch
		if !ok {
			return false
		}

		bts, err := json.Marshal(val)
		if err != nil {
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			slog.Info(fmt.Sprintf("streamResponse: json.Marshal failed with %s", err))
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			return false
		}

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		// Delineate chunks with new-line delimiter
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		bts = append(bts, '\n')
		if _, err := w.Write(bts); err != nil {
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			slog.Info(fmt.Sprintf("streamResponse: w.Write failed with %s", err))
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			return false
		}

		return true
	})
}
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// ChatPrompt builds up a prompt from a series of messages for the currently `loaded` model
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func chatPrompt(ctx context.Context, template string, messages []api.Message, numCtx int) (string, error) {
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	encode := func(s string) ([]int, error) {
		return loaded.runner.Encode(ctx, s)
	}

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	prompt, err := ChatPrompt(template, messages, numCtx, encode)
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	if err != nil {
		return "", err
	}

	return prompt, nil
}

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func ChatHandler(c *gin.Context) {
	loaded.mu.Lock()
	defer loaded.mu.Unlock()

	checkpointStart := time.Now()

	var req api.ChatRequest
	err := c.ShouldBindJSON(&req)
	switch {
	case errors.Is(err, io.EOF):
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "missing request body"})
		return
	case err != nil:
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// validate the request
	switch {
	case req.Model == "":
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "model is required"})
		return
	case len(req.Format) > 0 && req.Format != "json":
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "format must be json"})
		return
	}

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	model, err := GetModel(req.Model)
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	if err != nil {
		var pErr *fs.PathError
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		if errors.As(err, &pErr) {
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			c.JSON(http.StatusNotFound, gin.H{"error": fmt.Sprintf("model '%s' not found, try pulling it first", req.Model)})
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			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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	if model.IsEmbedding() {
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		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "embedding models do not support chat"})
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		return
	}

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	opts, err := modelOptions(model, req.Options)
	if err != nil {
		if errors.Is(err, api.ErrInvalidOpts) {
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			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
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			return
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		}
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		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
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	var sessionDuration time.Duration
	if req.KeepAlive == nil {
		sessionDuration = defaultSessionDuration
	} else {
		sessionDuration = req.KeepAlive.Duration
	}

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	if err := load(c, model, opts, sessionDuration); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
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		return
	}

	checkpointLoaded := time.Now()

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	// if the first message is not a system message, then add the model's default system message
	if len(req.Messages) > 0 && req.Messages[0].Role != "system" {
		req.Messages = append([]api.Message{
			{
				Role:    "system",
				Content: model.System,
			},
		}, req.Messages...)
	}

	prompt, err := chatPrompt(c.Request.Context(), model.Template, req.Messages, opts.NumCtx)
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	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
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	// an empty request loads the model
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	if len(req.Messages) == 0 || prompt == "" {
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		resp := api.ChatResponse{
			CreatedAt: time.Now().UTC(),
			Model:     req.Model,
			Done:      true,
			Message:   api.Message{Role: "assistant"},
		}
		c.JSON(http.StatusOK, resp)
		return
	}

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	// only send images that are in the prompt
	var i int
	var images []llm.ImageData
	for _, m := range req.Messages {
		for _, img := range m.Images {
			if !isSupportedImageType(img) {
				c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "unsupported image format"})
				return
			}

			if strings.Contains(prompt, fmt.Sprintf("[img-%d]", i)) {
				images = append(images, llm.ImageData{Data: img, ID: i})
			}
			i += 1
		}
	}

	slog.Debug("chat handler", "prompt", prompt, "images", len(images))
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	ch := make(chan any)

	go func() {
		defer close(ch)

		fn := func(r llm.PredictResult) {
			// Update model expiration
			loaded.expireAt = time.Now().Add(sessionDuration)
			loaded.expireTimer.Reset(sessionDuration)

			resp := api.ChatResponse{
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				Model:     req.Model,
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				CreatedAt: time.Now().UTC(),
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				Message:   api.Message{Role: "assistant", Content: r.Content},
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				Done:      r.Done,
				Metrics: api.Metrics{
					PromptEvalCount:    r.PromptEvalCount,
					PromptEvalDuration: r.PromptEvalDuration,
					EvalCount:          r.EvalCount,
					EvalDuration:       r.EvalDuration,
				},
			}

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			if r.Done {
				resp.TotalDuration = time.Since(checkpointStart)
				resp.LoadDuration = checkpointLoaded.Sub(checkpointStart)
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			}

			ch <- resp
		}

		// Start prediction
		predictReq := llm.PredictOpts{
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			Prompt:  prompt,
			Format:  req.Format,
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			Images:  images,
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			Options: opts,
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		}
		if err := loaded.runner.Predict(c.Request.Context(), predictReq, fn); err != nil {
			ch <- gin.H{"error": err.Error()}
		}
	}()

	if req.Stream != nil && !*req.Stream {
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		// Accumulate responses into the final response
		var final api.ChatResponse
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		var sb strings.Builder
		for resp := range ch {
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			switch r := resp.(type) {
			case api.ChatResponse:
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				sb.WriteString(r.Message.Content)
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				final = r
			case gin.H:
				if errorMsg, ok := r["error"].(string); ok {
					c.JSON(http.StatusInternalServerError, gin.H{"error": errorMsg})
					return
				} else {
					c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error format in response"})
					return
				}
			default:
				c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected error"})
				return
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			}
		}
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		final.Message = api.Message{Role: "assistant", Content: sb.String()}
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		c.JSON(http.StatusOK, final)
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		return
	}

	streamResponse(c, ch)
}