RAGFlow go API server (#13240)

# RAGFlow Go Implementation Plan 🚀

This repository tracks the progress of porting RAGFlow to Go. We'll
implement core features and provide performance comparisons between
Python and Go versions.

## Implementation Checklist

- [x] User Management APIs
- [x] Dataset Management Operations
- [x] Retrieval Test
- [x] Chat Management Operations
- [x] Infinity Go SDK

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>
Co-authored-by: Yingfeng Zhang <yingfeng.zhang@gmail.com>

internal/cli/cli.go

@@ -0,0 +1,140 @@
+//
+//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+//
+//  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 cli
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// CLI represents the command line interface
+type CLI struct {
+	parser  *Parser
+	client  *RAGFlowClient
+	prompt  string
+	running bool
+}
+
+// NewCLI creates a new CLI instance
+func NewCLI() (*CLI, error) {
+	return &CLI{
+		prompt: "RAGFlow> ",
+		client: NewRAGFlowClient("user"), // Default to user mode
+	}, nil
+}
+
+// Run starts the interactive CLI
+func (c *CLI) Run() error {
+	c.running = true
+	scanner := bufio.NewScanner(os.Stdin)
+
+	fmt.Println("Welcome to RAGFlow CLI")
+	fmt.Println("Type \\? for help, \\q to quit")
+	fmt.Println()
+
+	for c.running {
+		fmt.Print(c.prompt)
+
+		if !scanner.Scan() {
+			break
+		}
+
+		input := scanner.Text()
+		input = strings.TrimSpace(input)
+
+		if input == "" {
+			continue
+		}
+
+		if err := c.execute(input); err != nil {
+			fmt.Printf("Error: %v\n", err)
+		}
+	}
+
+	return scanner.Err()
+}
+
+func (c *CLI) execute(input string) error {
+	p := NewParser(input)
+	cmd, err := p.Parse()
+	if err != nil {
+		return err
+	}
+
+	if cmd == nil {
+		return nil
+	}
+
+	// Handle meta commands
+	if cmd.Type == "meta" {
+		return c.handleMetaCommand(cmd)
+	}
+
+	// Execute the command using the client
+	_, err = c.client.ExecuteCommand(cmd)
+	return err
+}
+
+func (c *CLI) handleMetaCommand(cmd *Command) error {
+	command := cmd.Params["command"].(string)
+
+	switch command {
+	case "q", "quit", "exit":
+		fmt.Println("Goodbye!")
+		c.running = false
+	case "?", "h", "help":
+		c.printHelp()
+	case "c", "clear":
+		// Clear screen (simple approach)
+		fmt.Print("\033[H\033[2J")
+	default:
+		return fmt.Errorf("unknown meta command: \\%s", command)
+	}
+	return nil
+}
+
+func (c *CLI) printHelp() {
+	help := `
+RAGFlow CLI Help
+================
+
+SQL Commands:
+  LOGIN USER 'email';                                    - Login as user
+  REGISTER USER 'name' AS 'nickname' PASSWORD 'pwd';     - Register new user
+  SHOW VERSION;                                          - Show version info
+  SHOW CURRENT USER;                                     - Show current user
+  LIST USERS;                                            - List all users
+  LIST SERVICES;                                         - List services
+  PING;                                                  - Ping server
+  ... and many more
+
+Meta Commands:
+  \\? or \\h      - Show this help
+  \\q or \\quit   - Exit CLI
+  \\c or \\clear  - Clear screen
+
+For more information, see documentation.
+`
+	fmt.Println(help)
+}
+
+// Cleanup performs cleanup before exit
+func (c *CLI) Cleanup() {
+	fmt.Println("\nCleaning up...")
+}