Exponential Backoff for Google APIs

工作流概述

这是一个包含8个节点的中等工作流,主要用于自动化处理各种任务。

工作流源代码

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{
  "id": "2NhqmUqW3KruEkaE",
  "meta": {
    "instanceId": "d868e3d040e7bda892c81b17cf446053ea25d2556fcef89cbe19dd61a3e876e9"
  },
  "name": "Exponential Backoff for Google APIs",
  "tags": [
    {
      "id": "nezaWFCGa7eZsVKu",
      "name": "Utility",
      "createdAt": "2024-11-13T18:08:08.207Z",
      "updatedAt": "2024-11-13T18:08:08.207Z"
    }
  ],
  "nodes": [
    {
      "id": "5d6b1730-33c5-401c-b73f-2b7ea8eedfe3",
      "name": "When clicking ‘Test workflow’",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        -580,
        -80
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "6726b630-597c-46cf-8839-75cd80108f2f",
      "name": "Exponential Backoff",
      "type": "n8n-nodes-base.code",
      "position": [
        160,
        120
      ],
      "parameters": {
        "mode": "runOnceForEachItem",
        "jsCode": "// Define the retry count (coming from a previous node or set manually)
const retryCount = $json[\"retryCount\"] || 0;  // If not present, default to 0
const maxRetries = 5;  // Define the maximum number of retries
const initialDelay = 1;  // Initial delay in seconds (1 second)

// If the retry count is less than the max retries, calculate the delay
if (retryCount < maxRetries) {
    const currentDelayInSeconds = initialDelay * Math.pow(2, retryCount);  // Exponential backoff delay in seconds
    
    // Log the delay time for debugging
    console.log(`Waiting for ${currentDelayInSeconds} seconds before retry...`);
    
    return {
        json: {
            retryCount: retryCount + 1,  // Increment retry count
            waitTimeInSeconds: currentDelayInSeconds, // Pass the delay time in seconds
            status: 'retrying',
        }
    };
} else {
    // If max retries are exceeded, return a failure response
    return {
        json: {
            error: 'Max retries exceeded',
            retryCount: retryCount,
            status: 'failed'
        }
    };
}
"
      },
      "typeVersion": 2
    },
    {
      "id": "605b8ff0-aa19-42dd-8dbb-aa12380ac4bc",
      "name": "Stop and Error",
      "type": "n8n-nodes-base.stopAndError",
      "position": [
        760,
        120
      ],
      "parameters": {
        "errorMessage": "Google Sheets API Limit has been triggered and the workflow has stopped"
      },
      "typeVersion": 1
    },
    {
      "id": "97818e8b-e0cc-4a49-8797-43e02535740f",
      "name": "Loop Over Items",
      "type": "n8n-nodes-base.splitInBatches",
      "position": [
        -360,
        -80
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 3
    },
    {
      "id": "0583eabd-bd97-4330-8a38-b2aed3a90c37",
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "onError": "continueErrorOutput",
      "position": [
        -120,
        20
      ],
      "parameters": {
        "options": {},
        "sheetName": {
          "__rl": true,
          "mode": "name",
          "value": "Sheet1"
        },
        "documentId": {
          "__rl": true,
          "mode": "url",
          "value": "https://docs.google.com/spreadsheets/d/1_gxZl6n_AYPHRFRTWfhy7TZnhEYuWzh8UvGdtWCD3sU/edit?gid=0#gid=0"
        },
        "authentication": "serviceAccount"
      },
      "credentials": {
        "googleApi": {
          "id": "lm7dPHYumCy6sP6k",
          "name": "AlexK1919 Google Service"
        }
      },
      "typeVersion": 4.5
    },
    {
      "id": "0d8023f8-f7ac-4303-b18e-821690cc9f94",
      "name": "Wait",
      "type": "n8n-nodes-base.wait",
      "position": [
        360,
        120
      ],
      "webhookId": "f1651aa1-6497-4496-9e07-240dcf1852f3",
      "parameters": {
        "amount": "={{ $json[\"waitTime\"] }}"
      },
      "typeVersion": 1.1
    },
    {
      "id": "72e0001e-f99b-4d57-9006-4a4dd5d3d8d5",
      "name": "Check Max Retries",
      "type": "n8n-nodes-base.if",
      "position": [
        560,
        120
      ],
      "parameters": {
        "options": {},
        "conditions": {
          "options": {
            "version": 2,
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
          },
          "combinator": "and",
          "conditions": [
            {
              "id": "51e191cb-af20-423b-9303-8523caa4ae0d",
              "operator": {
                "type": "number",
                "operation": "gt"
              },
              "leftValue": "={{ $('Exponential Backoff').item.json[\"retryCount\"] }}",
              "rightValue": 10
            }
          ]
        }
      },
      "typeVersion": 2.2
    },
    {
      "id": "2ea14bb0-4313-4595-811d-729ca6d37420",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        100,
        -80
      ],
      "parameters": {
        "color": 3,
        "width": 820,
        "height": 460,
        "content": "# Exponential Backoff for Google APIs 
## Connect these nodes to any Google API node such as the Google Sheets node example in this workflow"
      },
      "typeVersion": 1
    }
  ],
  "active": false,
  "pinData": {},
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "729e3a54-6238-4e4c-833e-8e37dba16dbb",
  "connections": {
    "Wait": {
      "main": [
        [
          {
            "node": "Check Max Retries",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Google Sheets": {
      "main": [
        [
          {
            "node": "Loop Over Items",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Exponential Backoff",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Loop Over Items": {
      "main": [
        [],
        [
          {
            "node": "Google Sheets",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Check Max Retries": {
      "main": [
        [
          {
            "node": "Stop and Error",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Google Sheets",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Exponential Backoff": {
      "main": [
        [
          {
            "node": "Wait",
            "type": "main",
            "index": 0
          },
          {
            "node": "Check Max Retries",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "When clicking ‘Test workflow’": {
      "main": [
        [
          {
            "node": "Loop Over Items",
            "type": "main",
            "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

  • Manualtrigger
  • Code
  • Stopanderror
  • Splitinbatches
  • Googlesheets

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

  1. 在n8n中导入工作流JSON文件
  2. 配置Gmail节点的认证信息
  3. 设置AI分类器的API密钥
  4. 自定义分类规则和标签映射
  5. 测试工作流执行
  6. 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