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279 lines
8.9 KiB
ReStructuredText
279 lines
8.9 KiB
ReStructuredText
Communications
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===============
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All the communication are done over HTTP using JSON.
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Errors
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======
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In case of error a standard HTTP error is raise and you got a
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JSON like that
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.. code-block:: json
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{
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"status": 409,
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"message": "Conflict"
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}
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409 error could be display to the user. They are normal behavior
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they are used to warn user about something he should change and
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they are not an internal software error.
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Sample session using curl
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=========================
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You need to read the :doc:`glossary` before.
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.. warning::
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Beware the output of this sample is truncated in order
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to simplify the understanding. Please read the
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documentation for the exact output.
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You can check the server version with a simple curl command:
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.. code-block:: shell-session
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# curl "http://localhost:3080/v2/version"
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{
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"version": "2.0.0dev1"
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}
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We will list the computes node where we can run our nodes:
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.. code-block:: shell-session
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# curl "http://localhost:3080/v2/computes"
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[
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{
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"compute_id": "local",
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"connected": true,
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"host": "127.0.0.1",
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"name": "Local",
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"port": 3080,
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"protocol": "http",
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"user": "admin"
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}
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]
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In this sample we have only one compute where we can run our nodes. This compute as a special id: local. This
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mean it's the local server embed in the GNS3 controller.
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The next step is to create a project.
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.. code-block:: shell-session
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# curl -X POST "http://localhost:3080/v2/projects" -d '{"name": "test"}'
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{
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"name": "test",
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"project_id": "b8c070f7-f34c-4b7b-ba6f-be3d26ed073f",
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}
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With this project id we can now create two VPCS Node.
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.. code-block:: shell-session
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# curl -X POST "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/nodes" -d '{"name": "VPCS 1", "node_type": "vpcs", "compute_id": "local"}'
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{
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"compute_id": "local",
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"console": 5000,
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"console_host": "127.0.0.1",
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"console_type": "telnet",
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"name": "VPCS 1",
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"node_id": "f124dec0-830a-451e-a314-be50bbd58a00",
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"node_type": "vpcs",
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"project_id": "b8c070f7-f34c-4b7b-ba6f-be3d26ed073f",
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"properties": {
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"startup_script": null,
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"startup_script_path": null
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},
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"status": "stopped"
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}
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# curl -X POST "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/nodes" -d '{"name": "VPCS 2", "node_type": "vpcs", "compute_id": "local"}'
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{
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"compute_id": "local",
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"console": 5001,
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"console_host": "127.0.0.1",
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"console_type": "telnet",
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"name": "VPCS 2",
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"node_id": "83892a4d-aea0-4350-8b3e-d0af3713da74",
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"node_type": "vpcs",
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"project_id": "b8c070f7-f34c-4b7b-ba6f-be3d26ed073f",
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"properties": {
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"startup_script": null,
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"startup_script_path": null
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},
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"status": "stopped"
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}
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The properties dictionnary contains all setting specific to a node type (dynamips, docker, vpcs...)
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Now we need to link the two VPCS by connecting their port 0 together.
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.. code-block:: shell-session
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# curl -X POST "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/links" -d '{"nodes": [{"adapter_number": 0, "node_id": "f124dec0-830a-451e-a314-be50bbd58a00", "port_number": 0}, {"adapter_number": 0, "node_id": "83892a4d-aea0-4350-8b3e-d0af3713da74", "port_number": 0}]}'
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{
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"capture_file_name": null,
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"capture_file_path": null,
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"capturing": false,
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"link_id": "007f2177-6790-4e1b-ac28-41fa226b2a06",
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"nodes": [
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{
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"adapter_number": 0,
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"node_id": "f124dec0-830a-451e-a314-be50bbd58a00",
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"port_number": 0
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},
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{
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"adapter_number": 0,
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"node_id": "83892a4d-aea0-4350-8b3e-d0af3713da74",
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"port_number": 0
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}
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],
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"project_id": "b8c070f7-f34c-4b7b-ba6f-be3d26ed073f"
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}
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Now we can start the two nodes.
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.. code-block:: shell-session
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# curl -X POST "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/nodes/f124dec0-830a-451e-a314-be50bbd58a00/start" -d "{}"
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# curl -X POST "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/nodes/83892a4d-aea0-4350-8b3e-d0af3713da74/start" -d "{}"
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Everything should be started now. You can connect via telnet to the different Node.
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The port is the field console in the create Node request.
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.. code-block:: shell-session
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# telnet 127.0.0.1 5000
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Trying 127.0.0.1...
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Connected to localhost.
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Escape character is '^]'.
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Welcome to Virtual PC Simulator, version 0.6
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Dedicated to Daling.
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Build time: Dec 29 2014 12:51:46
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Copyright (c) 2007-2014, Paul Meng (mirnshi@gmail.com)
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All rights reserved.
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VPCS is free software, distributed under the terms of the "BSD" licence.
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Source code and license can be found at vpcs.sf.net.
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For more information, please visit wiki.freecode.com.cn.
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Press '?' to get help.
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VPCS> ip 192.168.1.1
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Checking for duplicate address...
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PC1 : 192.168.1.1 255.255.255.0
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VPCS> disconnect
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Good-bye
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Connection closed by foreign host.
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# telnet 127.0.0.1 5001
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Trying 127.0.0.1...
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Connected to localhost.
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Escape character is '^]'.
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Welcome to Virtual PC Simulator, version 0.6
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Dedicated to Daling.
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Build time: Dec 29 2014 12:51:46
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Copyright (c) 2007-2014, Paul Meng (mirnshi@gmail.com)
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All rights reserved.
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VPCS is free software, distributed under the terms of the "BSD" licence.
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Source code and license can be found at vpcs.sf.net.
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For more information, please visit wiki.freecode.com.cn.
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Press '?' to get help.
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VPCS> ip 192.168.1.2
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Checking for duplicate address...
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PC1 : 192.168.1.2 255.255.255.0
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VPCS> ping 192.168.1.1
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84 bytes from 192.168.1.1 icmp_seq=1 ttl=64 time=0.179 ms
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84 bytes from 192.168.1.1 icmp_seq=2 ttl=64 time=0.218 ms
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84 bytes from 192.168.1.1 icmp_seq=3 ttl=64 time=0.190 ms
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84 bytes from 192.168.1.1 icmp_seq=4 ttl=64 time=0.198 ms
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84 bytes from 192.168.1.1 icmp_seq=5 ttl=64 time=0.185 ms
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VPCS> disconnect
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Good-bye
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Connection closed by foreign host.
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And we stop the two nodes.
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.. code-block:: shell-session
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# curl -X POST "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/nodes/f124dec0-830a-451e-a314-be50bbd58a00/stop" -d "{}"
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# curl -X POST "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/nodes/83892a4d-aea0-4350-8b3e-d0af3713da74/stop" -d "{}"
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You can see notification about the changes via the notification feed:
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.. code-block:: shell-session
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# curl "http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/notifications"
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{"action": "ping", "event": {"compute_id": "local", "cpu_usage_percent": 35.7, "memory_usage_percent": 80.7}}
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{"action": "node.updated", "event": {"command_line": "/usr/local/bin/vpcs -p 5001 -m 1 -i 1 -F -R -s 10001 -c 10000 -t 127.0.0.1", "compute_id": "local", "console": 5001, "console_host": "127.0.0.1", "console_type": "telnet", "name": "VPCS 2", "node_id": "83892a4d-aea0-4350-8b3e-d0af3713da74", "node_type": "vpcs", "project_id": "b8c070f7-f34c-4b7b-ba6f-be3d26ed073f", "properties": {"startup_script": null, "startup_script_path": null}, "status": "started"}}
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A websocket version is also available on http://localhost:3080/v2/projects/b8c070f7-f34c-4b7b-ba6f-be3d26ed073f/notifications/ws
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If you start the server with **--debug** you can see all the requests made by the client and by the controller to the computes nodes.
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Limitations
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============
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Concurrency
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------------
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A node can't process multiple request in the same time. But you can make
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multiple request on multiple node. It's transparent for the client
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when the first request on a Node start a lock is acquire for this node id
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and released for the next request at the end. You can safely send all
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the requests in the same time and let the server manage an efficent concurrency.
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We think it can be a little slower for some operations, but it's remove a big
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complexity for the client due to the fact only some command on some node can be
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concurrent.
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Authentication
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-----------------
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You can use HTTP basic auth to protect the access to the API. And run
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the API over HTTPS.
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Notifications
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=============
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You can receive notification from the server if you listen the HTTP stream /notifications or the websocket.
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The available notification are:
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* ping
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* compute.created
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* compute.updated
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* compute.deleted
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* node.created
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* node.updated
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* node.deleted
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* link.created
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* link.updated
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* link.deleted
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* log.error
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* log.warning
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* log.info
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Previous versions
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=================
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API version 1
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-------------
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Shipped with GNS3 1.3, 1.4 and 1.5. This API doesn't support the controller system.
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