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API 特别兴趣组/当前设计/链接

分析

OpenStack APIs 中如何引用链接

当前设计

Cinder

Cinder API 参考

Cinder 似乎对所有嵌入式链接引用使用 JSON Hyper-Schema [1] 风格。

示例

GET /
{
    "versions": [
        {
            "status": "CURRENT",
            "updated": "2012-01-04T11:33:21Z",
            "id": "v1.0",
            "links": [
                {
                    "href": "http://23.253.228.211:8776/v1/",
                    "rel": "self"
                }
            ]
        },
        {
            "status": "CURRENT",
            "updated": "2012-11-21T11:33:21Z",
            "id": "v2.0",
            "links": [
                {
                    "href": "http://23.253.228.211:8776/v2/",
                    "rel": "self"
                }
            ]
        }
    ]
}

GET /v2/{tenant_id}/volumes
{
    "volumes": [
        {
            "id": "45baf976-c20a-4894-a7c3-c94b7376bf55",
            "links": [
                {
                    "href": "https://:8776/v2/0c2eba2c5af04d3f9e9d0d410b371fde/volumes/45baf976-c20a-4894-a7c3-c94b7376bf55",
                    "rel": "self"
                },
                {
                    "href": "https://:8776/0c2eba2c5af04d3f9e9d0d410b371fde/volumes/45baf976-c20a-4894-a7c3-c94b7376bf55",
                    "rel": "bookmark"
                }
            ],
            "name": "vol-004"
        },
        {
            "id": "5aa119a8-d25b-45a7-8d1b-88e127885635",
            "links": [
                {
                    "href": "https://:8776/v2/0c2eba2c5af04d3f9e9d0d410b371fde/volumes/5aa119a8-d25b-45a7-8d1b-88e127885635",
                    "rel": "self"
                },
                {
                    "href": "https://:8776/0c2eba2c5af04d3f9e9d0d410b371fde/volumes/5aa119a8-d25b-45a7-8d1b-88e127885635",
                    "rel": "bookmark"
                }
            ],
            "name": "vol-003"
        }
    ]
}

Glance

Glance API 参考

Glance 正在使用 JSON Hyper-Schema [1] 风格的引用来表示其主页。

在大多数其他请求和响应中，glance 一致地使用键 "self"、"file"、"schema" 和 "first" 来记录相对 URL。这些字段似乎未使用带有协议和主机名的完全限定 URL。

示例

GET /
{
    "versions": [
        {
            "status": "CURRENT",
            "id": "v2.2",
            "links": [
                {
                    "href": "http://23.253.228.211:9292/v2/",
                    "rel": "self"
                }
            ]
        },
        {
            "status": "SUPPORTED",
            "id": "v2.1",
            "links": [
                {
                    "href": "http://23.253.228.211:9292/v2/",
                    "rel": "self"
                }
            ]
        },
        {
            "status": "SUPPORTED",
            "id": "v2.0",
            "links": [
                {
                    "href": "http://23.253.228.211:9292/v2/",
                    "rel": "self"
                }
            ]
        },
        {
            "status": "SUPPORTED",
            "id": "v1.1",
            "links": [
                {
                    "href": "http://23.253.228.211:9292/v1/",
                    "rel": "self"
                }
            ]
        },
        {
            "status": "SUPPORTED",
            "id": "v1.0",
            "links": [
                {
                    "href": "http://23.253.228.211:9292/v1/",
                    "rel": "self"
                }
            ]
        }
    ]
}

GET /v2/images
{
    "images": [
        {
            "status": "active",
            "name": "cirros-0.3.2-x86_64-disk",
            "tags": [],
            "container_format": "bare",
            "created_at": "2014-11-07T17:07:06Z",
            "disk_format": "qcow2",
            "updated_at": "2014-11-07T17:19:09Z",
            "visibility": "public",
            "self": "/v2/images/1bea47ed-f6a9-463b-b423-14b9cca9ad27",
            "min_disk": 0,
            "protected": false,
            "id": "1bea47ed-f6a9-463b-b423-14b9cca9ad27",
            "file": "/v2/images/1bea47ed-f6a9-463b-b423-14b9cca9ad27/file",
            "checksum": "64d7c1cd2b6f60c92c14662941cb7913",
            "owner": "5ef70662f8b34079a6eddb8da9d75fe8",
            "size": 13167616,
            "min_ram": 0,
            "schema": "/v2/schemas/image",
            "virtual_size": null
        },
        {
            "status": "active",
            "name": "F17-x86_64-cfntools",
            "tags": [],
            "container_format": "bare",
            "created_at": "2014-10-30T08:23:39Z",
            "disk_format": "qcow2",
            "updated_at": "2014-11-03T16:40:10Z",
            "visibility": "public",
            "self": "/v2/images/781b3762-9469-4cec-b58d-3349e5de4e9c",
            "min_disk": 0,
            "protected": false,
            "id": "781b3762-9469-4cec-b58d-3349e5de4e9c",
            "file": "/v2/images/781b3762-9469-4cec-b58d-3349e5de4e9c/file",
            "checksum": "afab0f79bac770d61d24b4d0560b5f70",
            "owner": "5ef70662f8b34079a6eddb8da9d75fe8",
            "size": 476704768,
            "min_ram": 0,
            "schema": "/v2/schemas/image",
            "virtual_size": null
        }
    ],
    "schema": "/v2/schemas/images",
    "first": "/v2/images"
}

Keystone

Keystone API 参考

Keystone 正在使用 JSON Hyper-Schema [1] 风格的引用来表示它返回的一些链接。

在一些请求和响应中，使用关键字 "self" 来引用资源链接，这些链接出现在类似于 JSON Hyper-Schema 风格的 "links" 字典中。这些 "links" 字典也可能包含 "next" 和 "previous" 链接。

还有一些响应使用 "self" 关键字和 "url" 关键字。"url" 键似乎既出现在请求中，也出现在响应中。

大多数调用似乎使用包装在 "links" 字典中的 "self" 关键字，如下所示

{
    "links": {
        "self": "http://spam:eggs/bacon"
    }
}

示例

GET /v3
{
    "version": {
        "id": "v3.4",
        "links": [
            {
                "href": "https://:35357/v3/",
                "rel": "self"
            }
        ],
        "media-types": [
            {
                "base": "application/json",
                "type": "application/vnd.openstack.identity-v3+json"
            }
        ],
        "status": "stable",
        "updated": "2015-03-30T00:00:00Z"
    }
}

GET /v3/auth/tokens
{
    "token": {
        "expires_at": "2013-02-27T18:30:59.999999Z",
        "issued_at": "2013-02-27T16:30:59.999999Z",
        "methods": [
            "password"
        ],
        "user": {
            "domain": {
                "id": "1789d1",
                "links": {
                    "self": "http://identity:35357/v3/domains/1789d1"
                },
                "name": "example.com"
            },
            "id": "0ca8f6",
            "links": {
                "self": "http://identity:35357/v3/users/0ca8f6"
            },
            "name": "Joe"
        }
    }
}

POST /v3/services

{
    "service": {
        "type": "volume"
    }
}

{
    "service": {
        "enabled": true,
        "id": "686766",
        "links": {
            "self": "http://identity:5000/v3/services/686766"
        },
        "type": "volume"
    }
}

POST /v3/endpoints

{
    "endpoint": {
        "interface": "public",
        "name": "name",
        "region_id": "north",
        "url": "http://identity:35357/v3/endpoints/828384",
        "service_id": "686766"
    }
}

{
    "endpoint": {
        "id": "828384",
        "interface": "internal",
        "links": {
            "self": "http://identity:35357/v3/endpoints/828384"
        },
        "name": "the internal volume endpoint",
        "region_id": "north",
        "service_id": "686766",
        "url": "http://identity:35357/v3/endpoints/828384"
    }
}

GET /v3/services
{
    "links": {
        "next": null,
        "previous": null,
        "self": "http://identity:5000/v3/services"
    },
    "services": [
        {
            "description": "Keystone Identity Service",
            "enabled": true,
            "id": "686766",
            "links": {
                "self": "http://identity:5000/v3/services/686766"
            },
            "name": "keystone",
            "type": "identity"
        },
        {
            "enabled": true,
            "id": "936521",
            "links": {
                "self": "http://identity:5000/v3/services/936521"
            },
            "type": "volume"
        }
    ]
}

Neutron

Neutron API 参考

Neutron 使用 JSON Hyper-Schema [1] 来表示返回的响应。除了其主页和版本页面外，neutron 不会在其响应中返回嵌入式链接。

示例

GET /
{
    "versions": [
        {
            "status": "CURRENT",
            "id": "v2.0",
            "links": [
                {
                    "href": "http://23.253.228.211:9696/v2.0",
                    "rel": "self"
                }
            ]
        }
    ]
}

Nova

Nova API 参考

Nova 似乎对大多数返回的响应使用 JSON Hyper-Schema [1]。

有一些响应使用 "url" 键来描述链接，尚不清楚这些链接是否仅用于外部资源。

还有一些调用允许值 "imageRef" 和 "flavorRef" 接受传入的链接。

示例

GET /
{
    "versions": [
        {
            "id": "v2.0",
            "links": [
                {
                    "href": "http://openstack.example.com/v2/",
                    "rel": "self"
                }
            ],
            "status": "SUPPORTED",
            "version": "",
            "min_version": "",
            "updated": "2011-01-21T11:33:21Z"
        },
        {
            "id": "v2.1",
            "links": [
                {
                    "href": "http://openstack.example.com/v2.1/",
                    "rel": "self"
                }
            ],
            "status": "CURRENT",
            "version": "2.3",
            "min_version": "2.1",
            "updated": "2013-07-23T11:33:21Z"
        }
    ]
}

POST /v2.1/​{tenant_id}​/os-agents

{
    "agent": {
        "hypervisor": "hypervisor",
        "os": "os",
        "architecture": "x86",
        "version": "8.0",
        "md5hash": "add6bb58e139be103324d04d82d8f545",
        "url": "http://example.com/path/to/resource"
    }
}

{
    "agent": {
        "agent_id": 1,
        "architecture": "x86",
        "hypervisor": "hypervisor",
        "md5hash": "add6bb58e139be103324d04d82d8f545",
        "os": "os",
        "url": "http://example.com/path/to/resource",
        "version": "8.0"
    }
}

POST /v2.1/{tenant_id}/servers

{
    "server": {
        "name": "new-server-test",
        "imageRef": "http://openstack.example.com/openstack/images/70a599e0-31e7-49b7-b260-868f441e862b",
        "flavorRef": "http://openstack.example.com/openstack/flavors/1",
        "metadata": {
            "My Server Name": "Apache1"
        },
        "min_count": "2",
        "max_count": "3"
    }
}

{
    "server": {
        "adminPass": "wfksH3GTTseP",
        "id": "440cf918-3ee0-4143-b289-f63e1d2000e6",
        "links": [
            {
                "href": "http://openstack.example.com/v2.1/servers/440cf918-3ee0-4143-b289-f63e1d2000e6",
                "rel": "self"
            },
            {
                "href": "http://openstack.example.com/servers/440cf918-3ee0-4143-b289-f63e1d2000e6",
                "rel": "bookmark"
            }
        ]
    }
}

参考文献

  1. ↑ 1.0 1.1 1.2 1.3 1.4 JSON Hyper-Schema
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