revert tokenize ffi (#4761)

* Revert "use `int32_t` for call to tokenize (#4738)"

This reverts commit 763bb65dbb88004cd046c8acc0c8e889816e1828.

* Revert "vocab only"

This reverts commit bf54c845e9ea63ec58762a991dcea78d2c934b47.

* Revert "use ffi for tokenizing/detokenizing"

This reverts commit 26a00a04108f6cae625802e69faa4b48480bc208.

llm/ext_server/server.cpp

@@ -2625,6 +2625,21 @@ static json format_partial_response(
     return res;
 }
 
+static json format_tokenizer_response(const std::vector<llama_token> &tokens)
+{
+    return json {
+        {"tokens", tokens}
+    };
+}
+
+static json format_detokenized_response(std::string content)
+{
+    return json {
+        {"content", content}
+    };
+}
+
+
 static void log_server_request(const httplib::Request &req, const httplib::Response &res)
 {
     // skip GH copilot requests when using default port
@@ -3114,6 +3129,34 @@ int main(int argc, char **argv) {
                 }
             });
 
+    svr.Post("/tokenize", [&llama](const httplib::Request &req, httplib::Response &res)
+            {
+                res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
+                const json body = json::parse(req.body);
+                std::vector<llama_token> tokens;
+                if (body.count("content") != 0)
+                {
+                    tokens = llama.tokenize(body["content"], false);
+                }
+                const json data = format_tokenizer_response(tokens);
+                return res.set_content(data.dump(), "application/json; charset=utf-8");
+            });
+
+    svr.Post("/detokenize", [&llama](const httplib::Request &req, httplib::Response &res)
+            {
+                res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
+                const json body = json::parse(req.body);
+                std::string content;
+                if (body.count("tokens") != 0)
+                {
+                    const std::vector<llama_token> tokens = body["tokens"];
+                    content = tokens_to_str(llama.ctx, tokens.cbegin(), tokens.cend());
+                }
+
+                const json data = format_detokenized_response(content);
+                return res.set_content(data.dump(), "application/json; charset=utf-8");
+            });
+
     svr.Post("/embedding", [&llama](const httplib::Request &req, httplib::Response &res)
             {
                 res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));

llm/llm.go

@@ -12,7 +12,6 @@ package llm
 import "C"
 import (
 	"fmt"
-	"strings"
 	"unsafe"
 )
 
@@ -38,62 +37,3 @@ func Quantize(infile, outfile string, ftype fileType) error {
 
 	return nil
 }
-
-type llamaModel struct {
-	m *C.struct_llama_model
-}
-
-func newLlamaModel(p string) *llamaModel {
-	cs := C.CString(p)
-	defer C.free(unsafe.Pointer(cs))
-
-	params := C.llama_model_default_params()
-	params.vocab_only = true
-
-	return &llamaModel{
-		C.llama_load_model_from_file(cs, params),
-	}
-}
-
-func (llm *llamaModel) Close() {
-	C.llama_free_model(llm.m)
-}
-
-func (llm *llamaModel) Tokenize(s string) []int {
-	cs := C.CString(s)
-	defer C.free(unsafe.Pointer(cs))
-
-	ltokens := make([]C.llama_token, len(s)+2)
-	n := C.llama_tokenize(
-		llm.m,
-		cs,
-		C.int32_t(len(s)),
-		&ltokens[0],
-		C.int32_t(len(ltokens)),
-		false,
-		true,
-	)
-
-	if n < 0 {
-		return nil
-	}
-
-	tokens := make([]int, n)
-	for i := 0; i < int(n); i++ {
-		tokens[i] = int(ltokens[i])
-	}
-
-	return tokens
-}
-
-func (llm *llamaModel) Detokenize(i32s []int) string {
-	var sb strings.Builder
-	for _, i32 := range i32s {
-		c := make([]byte, 512)
-		if n := C.llama_token_to_piece(llm.m, C.llama_token(i32), (*C.char)(unsafe.Pointer(&c[0])), C.int(len(c)), false); n > 0 {
-			sb.WriteString(unsafe.String(&c[0], n))
-		}
-	}
-
-	return sb.String()
-}

llm/server.go

@@ -57,8 +57,6 @@ type llmServer struct {
 	loadDuration   time.Duration // Record how long it took the model to load
 	loadProgress   float32
 
-	*llamaModel
-
 	sem *semaphore.Weighted
 }
 
@@ -311,7 +309,6 @@ func NewLlamaServer(gpus gpu.GpuInfoList, model string, ggml *GGML, adapters, pr
 			totalLayers:    ggml.KV().BlockCount() + 1,
 			gpuCount:       gpuCount,
 			done:           make(chan error, 1),
-			llamaModel:     newLlamaModel(model),
 		}
 
 		s.cmd.Env = os.Environ()
@@ -849,12 +846,12 @@ func (s *llmServer) Embedding(ctx context.Context, prompt string) ([]float64, er
 		return nil, fmt.Errorf("unexpected server status: %s", status.ToString())
 	}
 
-	var b bytes.Buffer
-	if err := json.NewEncoder(&b).Encode(EmbeddingRequest{Content: prompt}); err != nil {
+	data, err := json.Marshal(TokenizeRequest{Content: prompt})
+	if err != nil {
 		return nil, fmt.Errorf("error marshaling embed data: %w", err)
 	}
 
-	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("http://127.0.0.1:%d/embedding", s.port), &b)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("http://127.0.0.1:%d/embedding", s.port), bytes.NewBuffer(data))
 	if err != nil {
 		return nil, fmt.Errorf("error creating embed request: %w", err)
 	}
@@ -884,12 +881,108 @@ func (s *llmServer) Embedding(ctx context.Context, prompt string) ([]float64, er
 	return embedding.Embedding, nil
 }
 
+type TokenizeRequest struct {
+	Content string `json:"content"`
+}
+
+type TokenizeResponse struct {
+	Tokens []int `json:"tokens"`
+}
+
 func (s *llmServer) Tokenize(ctx context.Context, content string) ([]int, error) {
-	return s.llamaModel.Tokenize(content), nil
+	// Make sure the server is ready
+	status, err := s.getServerStatus(ctx)
+	if err != nil {
+		return nil, err
+	} else if status != ServerStatusReady && status != ServerStatusNoSlotsAvailable {
+		return nil, fmt.Errorf("unexpected server status: %s", status.ToString())
+	}
+
+	data, err := json.Marshal(TokenizeRequest{Content: content})
+	if err != nil {
+		return nil, fmt.Errorf("marshaling encode data: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("http://127.0.0.1:%d/tokenize", s.port), bytes.NewBuffer(data))
+	if err != nil {
+		return nil, fmt.Errorf("encode request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("do encode request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("read encode request: %w", err)
+	}
+
+	if resp.StatusCode >= 400 {
+		log.Printf("llm encode error: %s", body)
+		return nil, fmt.Errorf("%s", body)
+	}
+
+	var encoded TokenizeResponse
+	if err := json.Unmarshal(body, &encoded); err != nil {
+		return nil, fmt.Errorf("unmarshal encode response: %w", err)
+	}
+
+	return encoded.Tokens, nil
+}
+
+type DetokenizeRequest struct {
+	Tokens []int `json:"tokens"`
+}
+
+type DetokenizeResponse struct {
+	Content string `json:"content"`
 }
 
 func (s *llmServer) Detokenize(ctx context.Context, tokens []int) (string, error) {
-	return s.llamaModel.Detokenize(tokens), nil
+	// Make sure the server is ready
+	status, err := s.getServerStatus(ctx)
+	if err != nil {
+		return "", err
+	} else if status != ServerStatusReady && status != ServerStatusNoSlotsAvailable {
+		return "", fmt.Errorf("unexpected server status: %s", status.ToString())
+	}
+
+	data, err := json.Marshal(DetokenizeRequest{Tokens: tokens})
+	if err != nil {
+		return "", fmt.Errorf("marshaling decode data: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("http://127.0.0.1:%d/detokenize", s.port), bytes.NewBuffer(data))
+	if err != nil {
+		return "", fmt.Errorf("decode request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("do decode request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("read decode request: %w", err)
+	}
+
+	if resp.StatusCode >= 400 {
+		log.Printf("llm decode error: %s", body)
+		return "", fmt.Errorf("%s", body)
+	}
+
+	var decoded DetokenizeResponse
+	if err := json.Unmarshal(body, &decoded); err != nil {
+		return "", fmt.Errorf("unmarshal encode response: %w", err)
+	}
+
+	return decoded.Content, nil
 }
 
 func (s *llmServer) Close() error {
@@ -907,10 +1000,6 @@ func (s *llmServer) Close() error {
 		slog.Debug("llama server stopped")
 	}
 
-	if s.llamaModel != nil {
-		s.llamaModel.Close()
-	}
-
 	return nil
 }