(G) LineChatBot + Google Sheets (as a memory)
工作流概述
这是一个包含17个节点的复杂工作流，主要用于自动化处理各种任务。
工作流源代码
{
"id": "[CENSORED]",
"meta": {
"instanceId": "[CENSORED]",
"templateCredsSetupCompleted": true
},
"name": "(G) LineChatBot + Google Sheets (as a memory)",
"tags": [
{
"id": "[CENSORED]",
"name": "Guitar",
"createdAt": "2025-04-18T08:59:48.308Z",
"updatedAt": "2025-04-18T08:59:48.308Z"
}
],
"nodes": [
{
"id": "[CENSORED]",
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
560,
-500
],
"webhookId": "[CENSORED]",
"parameters": {
"path": "guitarpa",
"options": {},
"httpMethod": "POST"
},
"typeVersion": 2
},
{
"id": "[CENSORED]",
"name": "AI Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
460,
-220
],
"parameters": {
"text": "={{ $json.Prompt }}",
"options": {
"systemMessage": "=You are a helpful assistant. Your name is \"ลลิตา\". You will help me in everything I need. You will answer based on user language. You are an AI Agent operating in the Thailand time zone (Asia/Bangkok, UTC+7). Today is {{ $now }}."
},
"promptType": "define",
"hasOutputParser": true
},
"typeVersion": 1.8
},
{
"id": "[CENSORED]",
"name": "Google Gemini Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"position": [
460,
-20
],
"parameters": {
"options": {},
"modelName": "models/gemini-2.0-flash-001"
},
"credentials": {
"googlePalmApi": {
"id": "[CENSORED]",
"name": "Guitar's Gemini ([CENSORED_EMAIL])"
}
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Edit Fields",
"type": "n8n-nodes-base.set",
"position": [
780,
-500
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "[CENSORED]",
"name": "body.events[0].message.text",
"type": "string",
"value": "={{ $('Webhook').item.json.body.events[0].message.text }}"
},
{
"id": "[CENSORED]",
"name": "body.events[0].replyToken",
"type": "string",
"value": "={{ $('Webhook').item.json.body.events[0].replyToken }}"
},
{
"id": "[CENSORED]",
"name": "body.events[0].source.userId",
"type": "string",
"value": "={{ $json.body.events[0].source.userId }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "[CENSORED]",
"name": "HTTP Request",
"type": "n8n-nodes-base.httpRequest",
"position": [
1276,
-220
],
"parameters": {
"url": "https://api.line.me/v2/bot/message/reply",
"method": "POST",
"options": {},
"jsonBody": "={
\"replyToken\": \"{{ $('Edit Fields').item.json.body.events[0].replyToken }}\",
\"messages\": [
{
\"type\": \"text\",
\"text\": \"{{ $('AI Agent').item.json.output.replaceAll('\t', ' ').replaceAll('\\"', '\\\\"').replaceAll('\n', '\\n').trim() || 'No response available.' }}\"
}
]
}",
"sendBody": true,
"sendHeaders": true,
"specifyBody": "json",
"headerParameters": {
"parameters": [
{
"name": "Authorization",
"value": "Bearer [CENSORED]"
},
{
"name": "Content-Type",
"value": "application/json"
}
]
}
},
"typeVersion": 4.2
},
{
"id": "[CENSORED]",
"name": "Get History",
"type": "n8n-nodes-base.googleSheets",
"position": [
1000,
-500
],
"parameters": {
"options": {
"outputFormatting": {
"values": {
"date": "FORMATTED_STRING",
"general": "UNFORMATTED_VALUE"
}
},
"returnFirstMatch": true,
"dataLocationOnSheet": {
"values": {
"rangeDefinition": "detectAutomatically"
}
}
},
"filtersUI": {
"values": [
{
"lookupValue": "={{ $('Webhook').item.json.body.events[0].source.userId }}",
"lookupColumn": "UserID "
}
]
},
"sheetName": {
"__rl": true,
"mode": "list",
"value": "gid=0",
"cachedResultUrl": "[CENSORED]",
"cachedResultName": "Sheet1"
},
"documentId": {
"__rl": true,
"mode": "id",
"value": "[CENSORED]"
}
},
"credentials": {
"googleSheetsOAuth2Api": {
"id": "[CENSORED]",
"name": "[Guitar] Google Sheets ([CENSORED_EMAIL])"
}
},
"notesInFlow": false,
"typeVersion": 4.5,
"alwaysOutputData": true
},
{
"id": "[CENSORED]",
"name": "Prepare Prompt",
"type": "n8n-nodes-base.set",
"position": [
1220,
-500
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "[CENSORED]",
"name": "Prompt",
"type": "string",
"value": "={{
\"คุณคือลลิตา แชทบอทภาษาไทยที่สุภาพและเป็นมิตร ตอบตามบริบทของการสนทนา:\n\" +
($('Get History').item.json.History_Archive_1 || \"\") +
(($('Get History').item.json.History_Archive_1) ? \"\n\" : \"\") +
($('Get History').item.json.History_Archive_2 || \"\") +
(($('Get History').item.json.History_Archive_2) ? \"\n\" : \"\") +
($('Get History').item.json.History_Archive_3 || \"\") +
(($('Get History').item.json.History_Archive_3) ? \"\n\" : \"\") +
($('Get History').item.json.History_Archive_4 || \"\") +
(($('Get History').item.json.History_Archive_4) ? \"\n\" : \"\") +
($('Get History').item.json.History || \"\") +
(($('Get History').item.json.History) ? \"\n\" : \"\") +
\"ผู้ใช้: \" + $('Edit Fields').item.json.body.events[0].message.text + \"\nลลิตา: \"
}}
"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "[CENSORED]",
"name": "Save History",
"type": "n8n-nodes-base.googleSheets",
"position": [
1056,
-220
],
"parameters": {
"columns": {
"value": {
"History": "={{ $('Split History').item.json.historyToSave }}",
"UserID ": "={{ $('Edit Fields').item.json.body.events[0].source.userId }}",
"LastUpdated": "={{ new Date().toISOString() }}",
"History_Archive_1": "={{ $('Split History').item.json.historyArchive1 }}",
"History_Archive_2": "={{ $('Split History').item.json.historyArchive2 }}",
"History_Archive_3": "={{ $('Split History').item.json.historyArchive3 }}",
"History_Archive_4": "={{ $('Split History').item.json.historyArchive4 }}"
},
"schema": [
{
"id": "UserID ",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "UserID ",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "History",
"type": "string",
"display": true,
"required": false,
"displayName": "History",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "LastUpdated",
"type": "string",
"display": true,
"required": false,
"displayName": "LastUpdated",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "History_Archive_1",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "History_Archive_1",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "History_Archive_2",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "History_Archive_2",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "History_Archive_3",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "History_Archive_3",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "History_Archive_4",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "History_Archive_4",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "row_number",
"type": "string",
"display": true,
"removed": true,
"readOnly": true,
"required": false,
"displayName": "row_number",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"UserID "
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
},
"options": {},
"operation": "appendOrUpdate",
"sheetName": {
"__rl": true,
"mode": "list",
"value": "gid=0",
"cachedResultUrl": "[CENSORED]",
"cachedResultName": "Sheet1"
},
"documentId": {
"__rl": true,
"mode": "id",
"value": "[CENSORED]"
}
},
"credentials": {
"googleSheetsOAuth2Api": {
"id": "[CENSORED]",
"name": "[Guitar] Google Sheets ([CENSORED_EMAIL])"
}
},
"typeVersion": 4.5
},
{
"id": "[CENSORED]",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
460,
-560
],
"parameters": {
"content": "### Connect to Line Official Account's API"
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
740,
-560
],
"parameters": {
"width": 180,
"content": "Prepare the data"
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
960,
-560
],
"parameters": {
"width": 180,
"content": "Retrieve chat history"
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
1180,
-560
],
"parameters": {
"width": 180,
"content": "Give our AI previous chat history"
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
460,
-280
],
"parameters": {
"content": "Get input with this command. \"{{ $json.Prompt }}\""
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
780,
-280
],
"parameters": {
"width": 180,
"content": "Split history into small chunks (data cleaning)"
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Split History",
"type": "n8n-nodes-base.code",
"position": [
840,
-220
],
"parameters": {
"jsCode": "// Get the current history, new message, and response
let history = $('Get History').item.json.History || '';
let message = $('Edit Fields').item.json.body.events[0].message.text;
let response = $json.output;
let newExchange = `ผู้ใช้: ${message}\nลลิตา: ${response}`;
let updatedHistory = history + (history ? '\n' : '') + newExchange;
// Threshold: 70% of Google Sheets cell limit (50,000 characters * 0.7 = 35,000)
const threshold = 35000;
let historyToSave = updatedHistory;
let archive1 = $('Get History').item.json.History_Archive_1 || '';
let archive2 = $('Get History').item.json.History_Archive_2 || '';
let archive3 = $('Get History').item.json.History_Archive_3 || '';
let archive4 = $('Get History').item.json.History_Archive_4 || '';
// If history exceeds threshold, split it
if (updatedHistory.length > threshold) {
// Keep the last 17,500 characters in History (half of threshold for balance)
const keepLength = 17500;
const archiveChunk = updatedHistory.substring(0, updatedHistory.length - keepLength);
historyToSave = updatedHistory.substring(updatedHistory.length - keepLength);
// Distribute to archive cells, ensuring none exceed 35,000 characters
if (archive1.length < threshold) {
archive1 = (archive1 ? archive1 + '\n' : '') + archiveChunk;
if (archive1.length > threshold) {
const excess = archive1.substring(threshold);
archive1 = archive1.substring(0, threshold);
if (archive2.length < threshold) {
archive2 = (archive2 ? archive2 + '\n' : '') + excess;
}
}
}
if (archive2.length < threshold && archive1.length >= threshold) {
archive2 = (archive2 ? archive2 + '\n' : '') + archiveChunk;
if (archive2.length > threshold) {
const excess = archive2.substring(threshold);
archive2 = archive2.substring(0, threshold);
if (archive3.length < threshold) {
archive3 = (archive3 ? archive3 + '\n' : '') + excess;
}
}
}
if (archive3.length < threshold && archive2.length >= threshold) {
archive3 = (archive3 ? archive3 + '\n' : '') + archiveChunk;
if (archive3.length > threshold) {
const excess = archive3.substring(threshold);
archive3 = archive3.substring(0, threshold);
if (archive4.length < threshold) {
archive4 = (archive4 ? archive4 + '\n' : '') + excess;
}
}
}
if (archive4.length < threshold && archive3.length >= threshold) {
archive4 = (archive4 ? archive4 + '\n' : '') + archiveChunk;
if (archive4.length > threshold) {
archive4 = archive4.substring(0, threshold);
}
}
}
// Return the values to update
return [
{
json: {
historyToSave: historyToSave,
historyArchive1: archive1,
historyArchive2: archive2,
historyArchive3: archive3,
historyArchive4: archive4,
lastUpdated: new Date().toISOString()
}
}
];"
},
"typeVersion": 2
},
{
"id": "[CENSORED]",
"name": "Sticky Note6",
"type": "n8n-nodes-base.stickyNote",
"position": [
1000,
-280
],
"parameters": {
"width": 180,
"content": "Save to Google Sheets"
},
"typeVersion": 1
},
{
"id": "[CENSORED]",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
1220,
-280
],
"parameters": {
"width": 180,
"content": "Send it back to Line"
},
"typeVersion": 1
}
],
"active": true,
"pinData": {},
"settings": {
"executionOrder": "v1"
},
"versionId": "[CENSORED]",
"connections": {
"Webhook": {
"main": [
[
{
"node": "Edit Fields",
"type": "main",
"index": 0
}
]
]
},
"AI Agent": {
"main": [
[
{
"node": "Split History",
"type": "main",
"index": 0
}
]
]
},
"Edit Fields": {
"main": [
[
{
"node": "Get History",
"type": "main",
"index": 0
}
]
]
},
"Get History": {
"main": [
[
{
"node": "Prepare Prompt",
"type": "main",
"index": 0
}
]
]
},
"Save History": {
"main": [
[
{
"node": "HTTP Request",
"type": "main",
"index": 0
}
]
]
},
"Split History": {
"main": [
[
{
"node": "Save History",
"type": "main",
"index": 0
}
]
]
},
"Prepare Prompt": {
"main": [
[
{
"node": "AI Agent",
"type": "main",
"index": 0
}
]
]
},
"Google Gemini Chat Model": {
"ai_languageModel": [
[
{
"node": "AI Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
}
}
}功能特点
- 自动检测新邮件
- AI智能内容分析
- 自定义分类规则
- 批量处理能力
- 详细的处理日志
技术分析
节点类型及作用
- Webhook
- @N8N/N8N Nodes Langchain.Agent
- @N8N/N8N Nodes Langchain.Lmchatgooglegemini
- Set
- Httprequest
复杂度评估
配置难度：
维护难度：
扩展性：
实施指南
前置条件
- 有效的Gmail账户
- n8n平台访问权限
- Google API凭证
- AI分类服务订阅
配置步骤
- 在n8n中导入工作流JSON文件
- 配置Gmail节点的认证信息
- 设置AI分类器的API密钥
- 自定义分类规则和标签映射
- 测试工作流执行
- 配置定时触发器（可选）
关键参数
| 参数名称 | 默认值 | 说明 |
|---|---|---|
| maxEmails | 50 | 单次处理的最大邮件数量 |
| confidenceThreshold | 0.8 | 分类置信度阈值 |
| autoLabel | true | 是否自动添加标签 |
最佳实践
优化建议
- 定期更新AI分类模型以提高准确性
- 根据邮件量调整处理批次大小
- 设置合理的分类置信度阈值
- 定期清理过期的分类规则
安全注意事项
- 妥善保管API密钥和认证信息
- 限制工作流的访问权限
- 定期审查处理日志
- 启用双因素认证保护Gmail账户
性能优化
- 使用增量处理减少重复工作
- 缓存频繁访问的数据
- 并行处理多个邮件分类任务
- 监控系统资源使用情况
故障排除
常见问题
邮件未被正确分类
检查AI分类器的置信度阈值设置，适当降低阈值或更新训练数据。
Gmail认证失败
确认Google API凭证有效且具有正确的权限范围，重新进行OAuth授权。
调试技巧
- 启用详细日志记录查看每个步骤的执行情况
- 使用测试邮件验证分类逻辑
- 检查网络连接和API服务状态
- 逐步执行工作流定位问题节点
错误处理
工作流包含以下错误处理机制：
- 网络超时自动重试（最多3次）
- API错误记录和告警
- 处理失败邮件的隔离机制
- 异常情况下的回滚操作