Terraform AWS 仪表板 - 嵌套列表中的小部件答案

【问题标题】：Terraform AWS Dashboard - Widgets from nested listTerraform AWS 仪表板 - 嵌套列表中的小部件
【发布时间】：2021-09-30 21:24:27
【问题描述】：

Terraform 初学者在这里。我正在尝试从嵌套列表中创建一些小部件。组将是一个“标签”小部件，指示组，然后是与该组相关的金丝雀的度量小部件。所以仪表板应该如下所示：

第 1 组
小部件1、小部件2 等
第 2 组
小部件3、小部件4等

变量值：

dashboard = [
    {
        name = "Group-1",
        canaries  = ["canary1", "canary2", "canary3"]
    },
    {
        name = "Group-2",
        canaries  = ["canary4", "canary5"]
    }
]

尝试构建 json：

locals {
    body = [for group in var.dashboard :
                #Create text widget for Group name
                {
                    "height": 1,
                    "width": 24,
                    "y": 4,
                    "x": 0,
                    "type": "text",
                    "properties": {
                        "markdown": "\n#  > [${group.name}]\n"
                    }
                }
                #Attempt to create underlying widgets for group
                [for canary in group.canaries :
                    {
                        {
                            "height": 3,
                            "width": 6,
                            "y": 5,
                            "x": 0,
                            "type": "metric",
                            "properties": {
                                "metrics": [
                                    [ "CloudWatchSynthetics", "Failed", "CanaryName", "${canary}", { "label": "Canary failures count", "region": "us-west-2" } ]
                                ],
                                "title": "Failed canary runs",
                                "period": 60,
                                "region": "us-west-2",
                                "stat": "Sum",
                                "view": "singleValue",
                                "setPeriodToTimeRange": true
                            }
                        }
                    }
                ] #TF Doesn't like the inclusion of nested loop here or my syntax is incorrect.
            ]
}

资源创建：

resource "aws_cloudwatch_dashboard" "canary_dashboard" {
    dashboard_name = "Canary-Dashboard"
    dashboard_body = jsonencode({
        "widgets": concat(local.body)
    })
}

在我创建body 时，Terraform 抱怨Missing close bracket on index，但我已经三次检查我没有遗漏括号或花括号。如何从嵌套列表动态创建仪表板小部件？

编辑
按照 Jordan 的建议，在下面包括所需的 json 输出。最后，会有n 个组，每个组有n 个属于该组的金丝雀。

{
    "widgets": [
        {
            "height": 1,
            "width": 24,
            "y": 4,
            "x": 0,
            "type": "text",
            "properties": {
                "markdown": "\n# Group1\n"
            }
        },
        {
            "height": 3,
            "width": 6,
            "y": 5,
            "x": 6,
            "type": "metric",
            "properties": {
                "metrics": [
                    [ "CloudWatchSynthetics", "Failed", "CanaryName", "Group1-Canary", { "label": "Canary failures count", "region": "us-west-2" } ]
                ],
                "title": "Failed canary runs",
                "period": 60,
                "region": "us-west-2",
                "stat": "Sum",
                "view": "singleValue",
                "setPeriodToTimeRange": true
            }
        },
        {
            "height": 1,
            "width": 24,
            "y": 4,
            "x": 0,
            "type": "text",
            "properties": {
                "markdown": "\n# Group2\n"
            }
        },
        {
            "height": 3,
            "width": 6,
            "y": 5,
            "x": 6,
            "type": "metric",
            "properties": {
                "metrics": [
                    [ "CloudWatchSynthetics", "Failed", "CanaryName", "Group2-Canary", { "label": "Canary failures count", "region": "us-west-2" } ]
                ],
                "title": "Failed canary runs",
                "period": 60,
                "region": "us-west-2",
                "stat": "Sum",
                "view": "singleValue",
                "setPeriodToTimeRange": true
            }
        },
    ]
}

【问题讨论】：

标签： terraform dashboard terraform-provider-aws

【解决方案1】：

您正在尝试使用 Terraform 不允许的列表理解做一些事情（请参阅我在哪里标记了“这里”）：

locals {
    body = [for group in var.dashboard :
                #Create text widget for Group name
                {
                    "height": 1,
                    "width": 24,
                    "y": 4,
                    "x": 0,
                    "type": "text",
                    "properties": {
                        "markdown": "\n#  > [${group.name}]\n"
                    }
                }                                                       <===== HERE
                #Attempt to create underlying widgets for group
                [for canary in group.canaries :
                    {
                        {
                            "height": 3,
                            "width": 6,
                            "y": 5,
                            "x": 0,
                            "type": "metric",
                            "properties": {
                                "metrics": [
                                    [ "CloudWatchSynthetics", "Failed", "CanaryName", "${canary}", { "label": "Canary failures count", "region": "us-west-2" } ]
                                ],
                                "title": "Failed canary runs",
                                "period": 60,
                                "region": "us-west-2",
                                "stat": "Sum",
                                "view": "singleValue",
                                "setPeriodToTimeRange": true
                            }
                        }
                    }
                ] #TF Doesn't like the inclusion of nested loop here or my syntax is incorrect.
            ]
}

如果 TF 允许你做你想做的事，你最终会得到类似的结果：

body = [
  {
    "height": 1,
    "width": 24,
    "y": 4,
    "x": 0,
    "type": "text",
    "properties": {
      "markdown": "\n#  > [${group.name}]\n"
    }
  },
  [
    {
        {
            "height": 3,
            "width": 6,
            "y": 5,
            "x": 0,
            "type": "metric",
            "properties": {
                "metrics": [
                    [ "CloudWatchSynthetics", "Failed", "CanaryName", "${canary}", { "label": "Canary failures count", "region": "us-west-2" } ]
                ],
                "title": "Failed canary runs",
                "period": 60,
                "region": "us-west-2",
                "stat": "Sum",
                "view": "singleValue",
                "setPeriodToTimeRange": true
            }
        }
    },
    {
        {
            "height": 3,
            "width": 6,
            "y": 5,
            "x": 0,
            "type": "metric",
            "properties": {
                "metrics": [
                    [ "CloudWatchSynthetics", "Failed", "CanaryName", "${canary}", { "label": "Canary failures count", "region": "us-west-2" } ]
                ],
                "title": "Failed canary runs",
                "period": 60,
                "region": "us-west-2",
                "stat": "Sum",
                "view": "singleValue",
                "setPeriodToTimeRange": true
            }
        }
    }
  ]
]

我怀疑这就是你想要做的。如果您可以提供您希望 JSON 的样子的示例，我们可以向您展示如何实现它。

【讨论】：