=======================
The Tricircle Admin API
=======================
This Admin API documentation describes the ways of interacting with the
Tricircle service via HTTP protocol using Representational State Transfer(ReST).

API Versions
============
In order to bring new features to users over time, versioning is supported
by the Tricircle. The latest version of the Tricircle is v1.0.

The Version APIs work the same as other APIs as they still require
authentication.

+------------------+----------------+-----+-----------------------------------------------+
|**GET**           |/               |     |List All Major versions                        |
|                  |                |     |                                               |
|**GET**           |/{api_version}  |     |Show Details of Specific API Version           |
+------------------+----------------+-----+-----------------------------------------------+

Service URLs
============
All API calls through the rest of this document require authentication with
the OpenStack Identity service. They also require a base service url that can
be got from the OpenStack Tricircle endpoint. This will be the root url that
every call below will be added to build a full path.

For instance, if the Tricircle service url is http://127.0.0.1/tricircle/v1.0
then the full API call for /pods is http://127.0.0.1/tricircle/v1.0/pods.

As such, for the rest of this document we will leave out the root url where
GET /pods really means GET {tricircle_service_url}/pods.

Pod
===
A pod represents a region in Keystone. When operating a pod, the Tricircle
decides the correct endpoints to send request based on the region of the pod.
Considering the architecture of the Tricircle, we have two kinds of pods: pod
for central Neutron and pod for local Neutron.


+------------------+---------+-----------------------------------+------------------------+
|**GET**           |/pods    |                                   |Retrieve Pod List       |
+------------------+---------+-----------------------------------+------------------------+

This fetches all the pods, including pod for central Neutron and pod(s) for
local Neutron.

Normal Response Code: 200

**Response**

Pods contains a list of pod instances whose attributes are described in the
following table.

+-----------+-------+---------------+-----------------------------------------------------+
|Name       |In     |   Type        |    Description                                      |
+===========+=======+===============+=====================================================+
|pod_id     |body   | string        |pod_id is a uuid attribute of the pod object.        |
+-----------+-------+---------------+-----------------------------------------------------+
|region_name|body   | string        |region_name is specified by user but must match the  |
|           |       |               |region name registered in Keystone.                  |
+-----------+-------+---------------+-----------------------------------------------------+
|az_name    |body   | string        |When az_name is empty, it means this is a pod for    |
|           |       |               |central Neutron. If az_name is not empty, it means   |
|           |       |               |the pod will belong to this availability zone.       |
|           |       |               |Multiple pods with the same az_name means that these |
|           |       |               |pods are under the same availability zone.           |
+-----------+-------+---------------+-----------------------------------------------------+
|pod_az_name|body   | string        |pod_az_name is the az name used in the pod for local |
|           |       |               |Neutron when creating network, router objects. It    |
|           |       |               |could be empty. If it's empty, then no az parameter  |
|           |       |               |will be added to the request forwarded to the pod for|
|           |       |               |local Neutron. If the pod_az_name is different from  |
|           |       |               |az_name, then the az parameter will be replaced with |
|           |       |               |the pod_az_name when the request is forwarded to     |
|           |       |               |relevant pod for local Neutron.                      |
+-----------+-------+---------------+-----------------------------------------------------+
|dc_name    |body   | string        |dc_name is the name of the data center where the pod |
|           |       |               |is located.                                          |
+-----------+-------+---------------+-----------------------------------------------------+

**Response Example**

This is an example of response information for GET /pods.

::

    {
        "pods": [
           {
                "dc_name": "",
                "pod_az_name": "",
                "pod_id": "1a51bee7-10f0-47e8-bb4a-70f51394069c",
                "az_name": "",
                "region_name": "RegionOne"
            },
            {
                "dc_name": "",
                "pod_az_name": "",
                "pod_id": "22cca6ad-b791-4805-af14-923c5224fcd2",
                "az_name": "az2",
                "region_name": "Pod2"
            },
            {
                "dc_name": "",
                "pod_az_name": "",
                "pod_id": "3c22e5d4-5fed-45ed-a1e9-d532668cedc2",
                "az_name": "az1",
                "region_name": "Pod1"
            }
        ]
    }

+------------------+-------------------+-----------------------+-------------------------------+
|**GET**           |/pods/{pod_id}     |                       |Retrieve a Single Pod          |
+------------------+-------------------+-----------------------+-------------------------------+

This fetches a pod for central Neutron or a pod for local Neutron.

Normal Response Code: 200

**Request**

+-----------+-------+---------------+-----------------------------------------------------+
|Name       |In     |   Type        |    Description                                      |
+===========+=======+===============+=====================================================+
|pod_id     |path   | string        |pod_id is a uuid attribute of the pod object.        |
+-----------+-------+---------------+-----------------------------------------------------+

**Response**

Here are two kinds of pods, including pod for central Neutron and pod for local
Neutron. az_name is one of its attributes. A pod with empty az_name is for
central Neutron, otherwise a pod with az_name specified is for local Neutron.
All of its attributes are described in the following table.

+-----------+-------+---------------+-----------------------------------------------------+
|Name       |In     |   Type        |    Description                                      |
+===========+=======+===============+=====================================================+
|pod_id     |body   | string        |pod_id is a uuid attribute of the pod object.        |
+-----------+-------+---------------+-----------------------------------------------------+
|region_name|body   | string        |region_name is specified by user but must match the  |
|           |       |               |region name registered in Keystone.                  |
+-----------+-------+---------------+-----------------------------------------------------+
|az_name    |body   | string        |When az_name is empty, it means this is a pod for    |
|           |       |               |central Neutron. If az_name is not empty, it means   |
|           |       |               |the pod will belong to this availability zone.       |
|           |       |               |Multiple pods with the same az_name means that these |
|           |       |               |pods are under the same availability zone.           |
+-----------+-------+---------------+-----------------------------------------------------+
|pod_az_name|body   | string        |pod_az_name is the az name used in the pod for local |
|           |       |               |Neutron when creating network, router objects. It    |
|           |       |               |could be empty. If it's empty, then no az parameter  |
|           |       |               |will be added to the request forwarded to the pod for|
|           |       |               |local Neutron. If the pod_az_name is different from  |
|           |       |               |az_name, then the az parameter will be replaced with |
|           |       |               |the pod_az_name when the request is forwarded to     |
|           |       |               |relevant pod for local Neutron.                      |
+-----------+-------+---------------+-----------------------------------------------------+
|dc_name    |body   | string        |dc_name is the name of the data center where the pod |
|           |       |               |is located.                                          |
+-----------+-------+---------------+-----------------------------------------------------+

**Response Example**

This is an example of response information for GET /pods/{pod_id}.

::

    {
        "pod": {
            "dc_name": "",
            "pod_az_name": "",
            "pod_id": "3c22e5d4-5fed-45ed-a1e9-d532668cedc2",
            "az_name": "az1",
            "region_name": "Pod1"
        }
    }

+---------------+-------+------------------------------------+--------------------+
|**POST**       |/pods  |                                    |Create a Pod        |
+---------------+-------+------------------------------------+--------------------+

This creates a pod for central Neutron or a pod for local Neutron.

Normal Response Code: 200

**Request**

Some essential attributes of the pod instance are required and described
in the following table.

+-----------+-------+---------------+-----------------------------------------------------+
|Name       |In     |   Type        |    Description                                      |
+===========+=======+===============+=====================================================+
|region_name|body   | string        |region_name is specified by user but must match the  |
|           |       |               |region name registered in Keystone.                  |
+-----------+-------+---------------+-----------------------------------------------------+
|az_name    |body   | string        |When az_name is empty, it means this is a pod for    |
|           |       |               |central Neutron. If az_name is not empty, it means   |
|           |       |               |the pod will belong to this availability zone.       |
|           |       |               |Multiple pods with the same az_name means that these |
|           |       |               |pods are under the same availability zone.           |
+-----------+-------+---------------+-----------------------------------------------------+
|pod_az_name|body   | string        |pod_az_name is the az name used in the pod for local |
|           |       |               |Neutron when creating network, router objects. It    |
|           |       |               |could be empty. If it's empty, then no az parameter  |
|           |       |               |will be added to the request forwarded to the pod for|
|           |       |               |local Neutron. If the pod_az_name is different from  |
|           |       |               |az_name, then the az parameter will be replaced with |
|           |       |               |the pod_az_name when the request is forwarded to     |
|           |       |               |relevant pod for local Neutron.                      |
+-----------+-------+---------------+-----------------------------------------------------+
|dc_name    |body   | string        |dc_name is the name of the data center where the pod |
|           |       |               |is located.                                          |
+-----------+-------+---------------+-----------------------------------------------------+

**Response**

An id is assigned to a pod instance when it's created. All of its attributes
are listed below.

+-----------+-------+---------------+-----------------------------------------------------+
|Name       |In     |   Type        |    Description                                      |
+===========+=======+===============+=====================================================+
|pod_id     |body   | string        |pod_id is automatically generated when creating a pod|
+-----------+-------+---------------+-----------------------------------------------------+
|region_name|body   | string        |region_name is specified by user but must match the  |
|           |       |               |region name registered in Keystone.                  |
+-----------+-------+---------------+-----------------------------------------------------+
|az_name    |body   | string        |When az_name is empty, it means this is a pod for    |
|           |       |               |central Neutron. If az_name is not empty, it means   |
|           |       |               |the pod will belong to this availability zone.       |
|           |       |               |Multiple pods with the same az_name means that these |
|           |       |               |pods are under the same availability zone.           |
+-----------+-------+---------------+-----------------------------------------------------+
|pod_az_name|body   | string        |pod_az_name is the az name used in the pod for local |
|           |       |               |Neutron when creating network, router objects. It    |
|           |       |               |could be empty. If it's empty, then no az parameter  |
|           |       |               |will be added to the request forwarded to the pod for|
|           |       |               |local Neutron. If the pod_az_name is different from  |
|           |       |               |az_name, then the az parameter will be replaced with |
|           |       |               |the pod_az_name when the request is forwarded to     |
|           |       |               |relevant pod for local Neutron.                      |
+-----------+-------+---------------+-----------------------------------------------------+
|dc_name    |body   | string        |dc_name is the name of the data center where the pod |
|           |       |               |is located.                                          |
+-----------+-------+---------------+-----------------------------------------------------+

**Request Example**

This is an example of request information for POST /pods.

::

    {
        "pod": {
            "region_name": "Pod3",
            "az_name": "az1",
            "pod_az_name": "az1",
            "dc_name": "data center 1"
        }
    }

**Response Example**

This is an example of response information for POST /pods.

::

    {
        "pod": {
            "dc_name": "data center 1",
            "pod_az_name": "az1",
            "pod_id": "e02e03b8-a94f-4eb1-991e-a8a271cc2313",
            "az_name": "az1",
            "region_name": "Pod3"
        }
    }


+------------------+-----------------+------------------------+-------------------------+
|**DELETE**        |/pods/{pod_id}   |                        |Delete a Pod             |
+------------------+-----------------+------------------------+-------------------------+

This deletes a pod for central Neutron or a pod for local Neutron from
availability-zone.

Normal Response Code: 200

**Request**

+-----------+-------+---------------+-----------------------------------------------------+
|Name       |In     |   Type        |    Description                                      |
+===========+=======+===============+=====================================================+
|pod_id     |path   | string        |pod_id is a uuid attribute of the pod object.        |
+-----------+-------+---------------+-----------------------------------------------------+

**Response**

There is no response. But we can list all the pods to verify whether the
specific pod has been deleted or not.

Resource Routing
================
The Tricircle is responsible for resource(for example, network, subnet, port,
router, etc) creation both in local Neutron and central Neutron.

In order to dispatch resource operation request to the proper local Neutron,
we need a resource routing table, which maps a resource from the central
Neutron to local Neutron where it's located.

When user issues a resource update, query or delete request, central Neutron
will capture this request and extract resource id from the request, then
dispatch the request to target local Neutron on the basis of the routing table.


+------------------+-------------+--------------------+---------------------------------+
|**GET**           |/routings    |                    |Retrieve All Resource Routings   |
+------------------+-------------+--------------------+---------------------------------+

This fetches all the resource routing entries by default, but we can
apply filter(s) on the returned values to only show the specific routing
entries. Accordingly the filtering condition(s) will be added to the tail of
the service url separated by question mark. For example, the default service
url is GET /routings, when filtering is applied, the service url becomes
GET /routings?attribute=attribute_value. One or multiple conditions are
supported.

Normal Response Code: 200

**Response**

The resource routing set contains a list of resource routing entries whose
attributes are described in the following table.

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|id           |body   | biginteger    |id is the unique identification of the resource      |
|             |       |               |routing.                                             |
+-------------+-------+---------------+-----------------------------------------------------+
|top_id       |body   | string        |top_id denotes the resource id on central Neutron.   |
+-------------+-------+---------------+-----------------------------------------------------+
|bottom_id    |body   | string        |bottom_id denotes the resource id on local Neutron.  |
+-------------+-------+---------------+-----------------------------------------------------+
|pod_id       |body   | string        |pod_id is the uuid of one pod(i.e., one region).     |
+-------------+-------+---------------+-----------------------------------------------------+
|project_id   |body   | string        |project_id is the uuid of a project object in        |
|             |       |               |KeyStone. "Tenant" is an old term for a project in   |
|             |       |               |Keystone. Starting in API version 3, "project" is the|
|             |       |               |preferred term. They are identical in the context.   |
+-------------+-------+---------------+-----------------------------------------------------+
|resource_type|body   | string        |resource_type denotes one of the available resource  |
|             |       |               |types, including network, subnet, port, router and   |
|             |       |               |security_group.                                      |
+-------------+-------+---------------+-----------------------------------------------------+
|created_at   |body   | timestamp     |created time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+
|updated_at   |body   | timestamp     |updated time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+

**Response Example**

This is an example of response information for GET /routings. By default, all
the resource routing entries will be returned.

::

    {
        "routings": [
           {
                "updated_at": "2016-09-25 03:16:31"",
                "created_at": "2016-09-25 03:16:30",
                "top_id": "4487087e-34c7-40d8-8553-3a4206d0591b",
                "id": 2,
                "bottom_id": "834ef10b-a96f-460c-b448-b39b9f3e6b52",
                "project_id": "d937fe2ad1064a37968885a58808f7a3",
                "pod_id": "444a8ce3-9fb6-4a0f-b948-6b9d31d6b202",
                "resource_type": "security_group"
            },
            {
                "updated_at": "2016-09-25 03:16:33",
                "created_at": "2016-09-25 03:16:32",
                "top_id": "a4d786fd-0511-4fac-be45-8b9ee447324b",
                "id": 3,
                "bottom_id": "7a05748c-5d1a-485e-bd5c-e52bc39b5414",
                "project_id": "d937fe2ad1064a37968885a58808f7a3",
                "pod_id": "444a8ce3-9fb6-4a0f-b948-6b9d31d6b202",
                "resource_type": "network"
            }
        ]
    }

This is an example of response information for GET /routings?id=2. When a
filter is applied to the list request, only the specific routing entry is
retrieved.

::

    {
        "routings": [
           {
                "updated_at": "2016-09-25 03:16:31"",
                "created_at": "2016-09-25 03:16:30",
                "top_id": "4487087e-34c7-40d8-8553-3a4206d0591b",
                "id": 2,
                "bottom_id": "834ef10b-a96f-460c-b448-b39b9f3e6b52",
                "project_id": "d937fe2ad1064a37968885a58808f7a3",
                "pod_id": "444a8ce3-9fb6-4a0f-b948-6b9d31d6b202",
                "resource_type": "security_group"
            }
        ]
    }

+------------------+---------------+---------------+-------------------------------------+
|**GET**           |/routings/{id} |               |Retrieve a Single Resource Routing   |
+------------------+---------------+---------------+-------------------------------------+

This fetches a single resource routing entry.

Normal Response Code: 200

**Request**

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|id           |path   | biginteger    |id is the unique identification of the resource      |
|             |       |               |routing.                                             |
+-------------+-------+---------------+-----------------------------------------------------+

**Response**

A kind of resource in central Neutron, when it is created by the Tricircle, is
mapped to the same resource in local Neutron. Resource routing records this
mapping relationship. All of its attributes are described in the following
table.

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|id           |body   | biginteger    |id is the unique identification of the resource      |
|             |       |               |routing.                                             |
+-------------+-------+---------------+-----------------------------------------------------+
|top_id       |body   | string        |top_id denotes the resource id on central Neutron.   |
+-------------+-------+---------------+-----------------------------------------------------+
|bottom_id    |body   | string        |bottom_id denotes the resource id on local Neutron.  |
+-------------+-------+---------------+-----------------------------------------------------+
|pod_id       |body   | string        |pod_id is the uuid of one pod(i.e., one region).     |
+-------------+-------+---------------+-----------------------------------------------------+
|project_id   |body   | string        |project_id is the uuid of a project object in        |
|             |       |               |KeyStone. "Tenant" is an old term for a project in   |
|             |       |               |Keystone. Starting in API version 3, "project" is the|
|             |       |               |preferred term. They are identical in the context.   |
+-------------+-------+---------------+-----------------------------------------------------+
|resource_type|body   | string        |resource_type denotes one of the available resource  |
|             |       |               |types, including network, subnet, port, router and   |
|             |       |               |security_group.                                      |
+-------------+-------+---------------+-----------------------------------------------------+
|created_at   |body   | timestamp     |created time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+
|updated_at   |body   | timestamp     |updated time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+

**Response Example**

This is an example of response information for GET /routings/{id}.

::

    {
        "routing": {
            "updated_at": null,
            "created_at": "2016-10-25 13:10:26",
            "top_id": "09fd7cc9-d169-4b5a-88e8-436ecf4d0bfe",
            "id": 43,
            "bottom_id": "dc80f9de-abb7-4ec6-ab7a-94f8fd1e20ef",
            "project_id": "d937fe2ad1064a37968885a58808f7a3",
            "pod_id": "444a8ce3-9fb6-4a0f-b948-6b9d31d6b202",
            "resource_type": "subnet"
        }
    }

+------------------+---------------+-----------------+-----------------------------------+
|**POST**          |/routings      |                 |Create a Resource Routing          |
+------------------+---------------+-----------------+-----------------------------------+

This creates a resource routing. For a kind of resource created in central
Neutron, it is mapped to the same resource in local Neutron.

Normal Response Code: 200

**Request**

Some essential fields of the resource routing entry are required and described
in the following table.

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|top_id       |body   | string        |top_id denotes the resource id on central Neutron.   |
+-------------+-------+---------------+-----------------------------------------------------+
|bottom_id    |body   | string        |bottom_id denotes the resource id on local Neutron.  |
+-------------+-------+---------------+-----------------------------------------------------+
|pod_id       |body   | string        |pod_id is the uuid of one pod(i.e., one region).     |
+-------------+-------+---------------+-----------------------------------------------------+
|project_id   |body   | string        |project_id is the uuid of a project object in        |
|             |       |               |KeyStone. "Tenant" is an old term for a project in   |
|             |       |               |Keystone. Starting in API version 3, "project" is the|
|             |       |               |preferred term. They are identical in the context.   |
+-------------+-------+---------------+-----------------------------------------------------+
|resource_type|body   | string        |resource_type denotes one of the available resource  |
|             |       |               |types, including network, subnet, port, router and   |
|             |       |               |security_group.                                      |
+-------------+-------+---------------+-----------------------------------------------------+

**Response**

An id is assigned to the resource routing when it's created. All routing
entry's attributes are listed below.

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|id           |body   | biginteger    |id is the unique identification of the resource      |
|             |       |               |routing.                                             |
+-------------+-------+---------------+-----------------------------------------------------+
|top_id       |body   | string        |top_id denotes the resource id on central Neutron.   |
+-------------+-------+---------------+-----------------------------------------------------+
|bottom_id    |body   | string        |bottom_id denotes the resource id on local Neutron.  |
+-------------+-------+---------------+-----------------------------------------------------+
|pod_id       |body   | string        |pod_id is the uuid of one pod(i.e., one region).     |
+-------------+-------+---------------+-----------------------------------------------------+
|project_id   |body   | string        |project_id is the uuid of a project object in        |
|             |       |               |KeyStone. "Tenant" is an old term for a project in   |
|             |       |               |Keystone. Starting in API version 3, "project" is the|
|             |       |               |preferred term. They are identical in the context.   |
+-------------+-------+---------------+-----------------------------------------------------+
|resource_type|body   | string        |resource_type denotes one of the available resource  |
|             |       |               |types, including network, subnet, port, router and   |
|             |       |               |security_group.                                      |
+-------------+-------+---------------+-----------------------------------------------------+
|created_at   |body   | timestamp     |created time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+
|updated_at   |body   | timestamp     |updated time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+

**Request Example**

This is an example of request information for POST /routings.

::

    {
        "routing": {
            "top_id": "09fd7cc9-d169-4b5a-88e8-436ecf4d0bfg",
            "bottom_id": "dc80f9de-abb7-4ec6-ab7a-94f8fd1e20ek",
            "pod_id": "444a8ce3-9fb6-4a0f-b948-6b9d31d6b202",
            "project_id": "d937fe2ad1064a37968885a58808f7a3",
            "resource_type": "subnet"
        }
    }

**Response Example**

This is an example of response information for POST /routings.

::

    {
        "routing": {
            "updated_at": null,
            "created_at": "2016-11-03 03:06:38",
            "top_id": "09fd7cc9-d169-4b5a-88e8-436ecf4d0bfg",
            "id": 45,
            "bottom_id": "dc80f9de-abb7-4ec6-ab7a-94f8fd1e20ek",
            "project_id": "d937fe2ad1064a37968885a58808f7a3",
            "pod_id": "444a8ce3-9fb6-4a0f-b948-6b9d31d6b202",
            "resource_type": "subnet"
        }
    }

+------------------+---------------+-----------------+-----------------------------------+
|**DELETE**        |/routings/{id} |                 |Delete a Resource Routing          |
+------------------+---------------+-----------------+-----------------------------------+

This deletes a resource routing entry. But deleting an existing routing entry
created by Tricircle itself may cause problem: Central Neutron may make wrong
judgement on whether the resource exists or not without this routing entry.
Moreover, related request can't be forwarded to the proper local Neutron
either.

Normal Response Code: 200

**Request**

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|id           |path   |  biginteger   |id is the unique identification of the resource      |
|             |       |               |routing.                                             |
+-------------+-------+---------------+-----------------------------------------------------+

**Response**

There is no response. But we can list all the resource routing entries to
verify whether the specific routing entry has been deleted or not.

+------------------+---------------+-----------------+-----------------------------------+
|**PUT**           |/routings/{id} |                 |Update a Resource Routing          |
+------------------+---------------+-----------------+-----------------------------------+

This updates an existing resource routing entry. But updating an existing
routing entry created by Tricircle itself may cause problem: Central Neutron
may make wrong judgement on whether the resource exists or not without this
routing entry. Moreover, related request can't be forwarded to the proper local
Neutron either.

Normal Response Code: 200

**Request**

Some specific attributes of the resource routing entry can be updated, but they
are only limited to the fields in the following table, other fields can not be
updated manually.

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|top_id       |body   | string        |top_id denotes the resource id on central Neutron.   |
+-------------+-------+---------------+-----------------------------------------------------+
|bottom_id    |body   | string        |bottom_id denotes the resource id on local Neutron.  |
+-------------+-------+---------------+-----------------------------------------------------+
|pod_id       |body   | string        |pod_id is the uuid of one pod(i.e., one region).     |
+-------------+-------+---------------+-----------------------------------------------------+
|project_id   |body   | string        |project_id is the uuid of a project object in        |
|             |       |               |KeyStone. "Tenant" is an old term for a project in   |
|             |       |               |Keystone. Starting in API version 3, "project" is the|
|             |       |               |preferred term. They are identical in the context.   |
+-------------+-------+---------------+-----------------------------------------------------+
|resource_type|body   | string        |resource_type denotes one of the available resource  |
|             |       |               |types, including network, subnet, port, router and   |
|             |       |               |security_group.                                      |
+-------------+-------+---------------+-----------------------------------------------------+

**Response**

Some specific fields of the resource routing entry will be updated. All
attributes of routing entry are listed below.

+-------------+-------+---------------+-----------------------------------------------------+
|Name         |In     |   Type        |    Description                                      |
+=============+=======+===============+=====================================================+
|id           |body   | biginteger    |id is the unique identification of the resource      |
|             |       |               |routing.                                             |
+-------------+-------+---------------+-----------------------------------------------------+
|top_id       |body   | string        |top_id denotes the resource id on central Neutron.   |
+-------------+-------+---------------+-----------------------------------------------------+
|bottom_id    |body   | string        |bottom_id denotes the resource id on local Neutron.  |
+-------------+-------+---------------+-----------------------------------------------------+
|pod_id       |body   | string        |pod_id is the uuid of one pod(i.e., one region).     |
+-------------+-------+---------------+-----------------------------------------------------+
|project_id   |body   | string        |project_id is the uuid of a project object in        |
|             |       |               |KeyStone. "Tenant" is an old term for a project in   |
|             |       |               |Keystone. Starting in API version 3, "project" is the|
|             |       |               |preferred term. They are identical in the context.   |
+-------------+-------+---------------+-----------------------------------------------------+
|resource_type|body   | string        |resource_type denotes one of the available resource  |
|             |       |               |types, including network, subnet, port, router and   |
|             |       |               |security_group.                                      |
+-------------+-------+---------------+-----------------------------------------------------+
|created_at   |body   | timestamp     |created time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+
|updated_at   |body   | timestamp     |updated time of the resource routing.                |
+-------------+-------+---------------+-----------------------------------------------------+

**Request Example**

This is an example of request information for PUT /routings/{id}.

::

    {
        "routing": {
            "resource_type": "router"
        }
    }

**Response Example**

This is an example of response information for PUT /routings/{id}. The change
of the field updated_at will be showed next time we retrieve this routing entry
from the database.

::

    {
        "routing": {
            "updated_at": null,
            "created_at": "2016-11-03 03:06:38",
            "top_id": "09fd7cc9-d169-4b5a-88e8-436ecf4d0bfg",
            "id": 45,
            "bottom_id": "dc80f9de-abb7-4ec6-ab7a-94f8fd1e20ek",
            "project_id": "d937fe2ad1064a37968885a58808f7a3",
            "pod_id": "444a8ce3-9fb6-4a0f-b948-6b9d31d6b202",
            "resource_type": "router"
        }
    }