# set aws credential "example" with iam policy "hermes"

$ cat ~/.aws/credentials
[example]
aws_access_key_id = ********************
aws_secret_access_key = ****************************************

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "hermes",
      "Effect": "Allow",
      "Action": [
        "ec2:DescribeReserved*",
        "rds:DescribeReserved*",
        "elasticache:DescribeReserved*",
        "organizations:List*",
        "organizations:Describe*",
        "ce:Get*"
      ],
      "Resource": "*"
    }
  ]
}

$ go get github.com/itsubaki/hermes

$ AWS_PROFILE=example hermes fetch
write: /var/tmp/hermes/pricing/ap-northeast-1.out
write: /var/tmp/hermes/pricing/us-west-2.out
write: /var/tmp/hermes/usage/2019-08.out
write: /var/tmp/hermes/usage/2019-07.out
write: /var/tmp/hermes/usage/2019-06.out
write: /var/tmp/hermes/usage/2019-04.out
write: /var/tmp/hermes/usage/2019-03.out
write: /var/tmp/hermes/usage/2019-02.out
write: /var/tmp/hermes/usage/2019-01.out
write: /var/tmp/hermes/usage/2018-12.out
write: /var/tmp/hermes/usage/2018-11.out
write: /var/tmp/hermes/usage/2018-10.out
write: /var/tmp/hermes/usage/2018-09.out

$ AWS_PROFILE=example hermes pricing | jq .
[
  {
    "Version": "20190730012138",
    "SKU": "PDMPNVN5SPA5HWHH",
    "OfferTermCode": "6QCMYABX3D",
    "Region": "ap-northeast-1",
    "InstanceType": "ds1.8xlarge",
    "UsageType": "APN1-Node:dw.hs1.8xlarge",
    "LeaseContractLength": "1yr",
    "PurchaseOption": "All Upfront",
    "OnDemand": 9.52,
    "ReservedQuantity": 49020,
    "ReservedHrs": 0,
    "Tenancy": "",
    "PreInstalled": "",
    "OperatingSystem": "",
    "Operation": "RunComputeNode:0001",
    "CacheEngine": "",
    "DatabaseEngine": "",
    "OfferingClass": "standard",
    "NormalizationSizeFactor": ""
  }
  ...
]

$ AWS_PROFILE=example hermes usage | jq .
[
  {
    "account_id": "123456789012",
    "description": "example",
    "region": "us-west-2",
    "usage_type": "USW2-NodeUsage:cache.t2.small",
    "cache_engine": "Redis",
    "date": "2019-08",
    "instance_hour": 101,
    "instance_num": 0.135752688172043
  }
  ...
]

$ AWS_PROFILE=example hermes usage --format csv  | column -t -s, | less -S

$ cat purchase.json | hermes | jq .
{
  "region": "ap-northeast-1",
  "usage_type": "APN1-BoxUsage:c4.large",
  "platform": "Linux/UNIX",
  "instance_num": 1648
}