Terraform 0.11 - 在资源之间共享复杂的属性值答案

【问题标题】：Terraform 0.11 - Share complex attribute values between resourcesTerraform 0.11 - 在资源之间共享复杂的属性值
【发布时间】：2020-04-26 05:27:22
【问题描述】：

我目前正在使用 Terraform 编写多个 AWS Kinesis Data Analytics 应用程序。两个应用程序共享相同的 Kinesis 输入流，因此具有相同的架构：

resource "aws_kinesis_analytics_application" "example1" {
  name = "example1"

  inputs {
    # SHARE THIS ATTRIBUTE VALUE WITH example2
    schema {
      record_columns {
        mapping  = "$.FIELD1"
        name     = "FIELD1"
        sql_type = "VARCHAR(32)"
      }

      record_columns {
        mapping  = "$.FIELD2"
        name     = "FIELD2"
        sql_type = "VARCHAR(32)"
      }

      record_format {
        mapping_parameters {
          json {
            record_row_path = "$"
          }
        }
      }

    }
  }

  outputs {
    # other attributes

    schema {
      record_format_type = "JSON"
    }
  }

  code = "SQL code ...."
}

resource "aws_kinesis_analytics_application" "example2" {
  name = "example2"

  inputs {
    # SHARE THIS ATTRIBUTE VALUE WITH example1
    schema {
      record_columns {
        mapping  = "$.FIELD1"
        name     = "FIELD1"
        sql_type = "VARCHAR(32)"
      }

      record_columns {
        mapping  = "$.FIELD2"
        name     = "FIELD2"
        sql_type = "VARCHAR(32)"
      }

      record_format {
        mapping_parameters {
          json {
            record_row_path = "$"
          }
        }
      }

    }
  }

  outputs {
    # Other attributes

    schema {
      record_format_type = "JSON"
    }
  }

  code = "SQL code...."
}

我假设如果有可用于架构的数据源，这是可能的：

data "aws_kinesis_analytics_application_schema" "example_input" {
      record_columns {
        mapping  = "$.FIELD1"
        name     = "FIELD1"
        sql_type = "VARCHAR(32)"
      }

      record_columns {
        mapping  = "$.FIELD2"
        name     = "FIELD2"
        sql_type = "VARCHAR(32)"
      }

      record_format {
        mapping_parameters {
          json {
            record_row_path = "$"
          }
        }
      }
}

resource "aws_kinesis_analytics_application" "example1" {
  name = "example1"

  inputs {
    # Other attributes
    schema = "${data.aws_kinesis_analytics_application_schema.example_input}"
  }

  outputs {
    # other attributes

    schema {
      record_format_type = "JSON"
    }
  }

  code = "SQL code ...."
}

resource "aws_kinesis_analytics_application" "example2" {
  name = "example2"

  inputs {
    # Other attributes
    schema = "${data.aws_kinesis_analytics_application_schema.example_input}"
  }

  outputs {
    # Other attributes

    schema {
      record_format_type = "JSON"
    }
  }

  code = "SQL code...."
}

但是，没有可用于此资源的此特定属性的数据源。不使用数据源，是否可以在资源之间共享如此复杂的属性？

【问题讨论】：

标签： terraform terraform-provider-aws

【解决方案1】：

您可以为此使用变量：

variable schema {
   record_columns = [
      {....},
      {....}
   ]
   record_format {
      mappings_parameters = [
         {....}
      ]
   }
}

resource "aws_kinesis_analytics_application" "example1" {
  name = "example1"

  inputs {
    schema = "${var.schema}"
  }

  outputs {
    # other attributes

    schema {
      record_format_type = "JSON"
    }
  }

  code = "SQL code ...."
}

resource "aws_kinesis_analytics_application" "example2" {
  name = "example2"

  inputs {
    # SHARE THIS ATTRIBUTE VALUE WITH example1
    schema = "${var.schema}"
  }

  outputs {
    # Other attributes

    schema {
      record_format_type = "JSON"
    }
  }

  code = "SQL code...."
}

【讨论】：