feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/infra/impl/document/nl2sql/builtin/nl2sql.go

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package builtin
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/cloudwego/eino/components/prompt"
+	"github.com/cloudwego/eino/compose"
+	"github.com/cloudwego/eino/schema"
+
+	"github.com/coze-dev/coze-studio/backend/infra/contract/chatmodel"
+	"github.com/coze-dev/coze-studio/backend/infra/contract/document"
+	"github.com/coze-dev/coze-studio/backend/infra/contract/document/nl2sql"
+	"github.com/coze-dev/coze-studio/backend/pkg/logs"
+)
+
+const (
+	defaultTableFmt  = "table name: %s.\ntable describe: %s.\n\n| field name | description | field type | is required |\n"
+	defaultColumnFmt = "| %s | %s | %s | %t |\n\n"
+)
+
+func NewNL2SQL(_ context.Context, cm chatmodel.BaseChatModel, tpl prompt.ChatTemplate) (nl2sql.NL2SQL, error) {
+	return &n2s{cm: cm, tpl: tpl}, nil
+}
+
+type n2s struct {
+	ch       *compose.Chain[*nl2sqlInput, string]
+	runnable compose.Runnable[*nl2sqlInput, string]
+
+	cm  chatmodel.BaseChatModel
+	tpl prompt.ChatTemplate
+}
+
+func (n *n2s) NL2SQL(ctx context.Context, messages []*schema.Message, tables []*document.TableSchema, opts ...nl2sql.Option) (sql string, err error) {
+	o := &nl2sql.Options{ChatModel: n.cm}
+	for _, opt := range opts {
+		opt(o)
+	}
+
+	if o.ChatModel == nil {
+		return "", fmt.Errorf("[NL2SQL] chat model not configured")
+	}
+
+	c := compose.NewChain[*nl2sqlInput, string]().
+		AppendLambda(compose.InvokableLambda(func(ctx context.Context, input *nl2sqlInput) (output map[string]any, err error) {
+			if len(input.tables) == 0 {
+				return nil, errors.New("table meta is empty")
+			}
+			tableDesc := strings.Builder{}
+			for _, table := range input.tables {
+				tableDesc.WriteString(fmt.Sprintf(defaultTableFmt, table.Name, table.Comment))
+				for _, column := range table.Columns {
+					tableDesc.WriteString(fmt.Sprintf(defaultColumnFmt, column.Name, column.Description, column.Type.String(), !column.Nullable))
+				}
+			}
+			//logs.CtxInfof(ctx, "table schema: %s", tableDesc.String())
+			return map[string]interface{}{
+				"messages":     input.messages,
+				"table_schema": tableDesc.String(),
+			}, nil
+		})).
+		AppendChatTemplate(n.tpl).
+		AppendChatModel(o.ChatModel).
+		AppendLambda(compose.InvokableLambda(func(ctx context.Context, msg *schema.Message) (sql string, err error) {
+			var promptResp *promptResponse
+			if err := json.Unmarshal([]byte(msg.Content), &promptResp); err != nil {
+				logs.CtxWarnf(ctx, "unmarshal failed: %v", err)
+				return "", err
+			}
+			if promptResp.SQL == "" {
+				logs.CtxInfof(ctx, "no sql generated, err_code: %v, err_msg: %v", promptResp.ErrCode, promptResp.ErrMsg)
+				return "", errors.New(promptResp.ErrMsg)
+			}
+			return promptResp.SQL, nil
+		}))
+
+	r, err := c.Compile(ctx)
+	if err != nil {
+		return "", err
+	}
+
+	input := &nl2sqlInput{
+		messages: messages,
+		tables:   tables,
+	}
+
+	return r.Invoke(ctx, input)
+}
+
+type nl2sqlInput struct {
+	messages []*schema.Message
+	tables   []*document.TableSchema
+}
+
+type promptResponse struct {
+	SQL     string `json:"sql"`
+	ErrCode int    `json:"err_code"`
+	ErrMsg  string `json:"err_msg"`
+}