# 
[](https://en.wikipedia.org/wiki/MIT_License)
[](https://www.repostatus.org/#active)
[](https://github.com/open-traffic-generator/snappi/actions)
[](https://lgtm.com/projects/g/open-traffic-generator/snappi/alerts/)
[](https://lgtm.com/projects/g/open-traffic-generator/snappi/context:python)
[](https://pypi.org/project/snappi)
[](https://pypi.python.org/pypi/snappi)
Test scripts written in `snappi`, an auto-generated python SDK, can be executed against any traffic generator conforming to [Open Traffic Generator API](https://github.com/open-traffic-generator/models).
[Ixia-c](https://github.com/open-traffic-generator/ixia-c) is one such reference implementation of Open Traffic Generator API.
> The repository is under active development and is subject to updates. All efforts will be made to keep the updates backwards compatible.
## Setup Client
```sh
python -m pip install --upgrade snappi
```
## Start Testing
```python
import datetime
import time
import snappi
import pytest
@pytest.mark.example
def test_quickstart():
# Create a new API handle to make API calls against OTG
# with HTTP as default transport protocol
api = snappi.api(location="https://localhost:8443")
# Create a new traffic configuration that will be set on OTG
config = api.config()
# Add a test port to the configuration
ptx = config.ports.add(name="ptx", location="veth-a")
# Configure a flow and set previously created test port as one of endpoints
flow = config.flows.add(name="flow")
flow.tx_rx.port.tx_name = ptx.name
# and enable tracking flow metrics
flow.metrics.enable = True
# Configure number of packets to transmit for previously configured flow
flow.duration.fixed_packets.packets = 100
# and fixed byte size of all packets in the flow
flow.size.fixed = 128
# Configure protocol headers for all packets in the flow
eth, ip, udp, cus = flow.packet.ethernet().ipv4().udp().custom()
eth.src.value = "00:11:22:33:44:55"
eth.dst.value = "00:11:22:33:44:66"
ip.src.value = "10.1.1.1"
ip.dst.value = "20.1.1.1"
# Configure repeating patterns for source and destination UDP ports
udp.src_port.values = [5010, 5015, 5020, 5025, 5030]
udp.dst_port.increment.start = 6010
udp.dst_port.increment.step = 5
udp.dst_port.increment.count = 5
# Configure custom bytes (hex string) in payload
cus.bytes = "".join([hex(c)[2:] for c in b"..QUICKSTART SNAPPI.."])
# Optionally, print JSON representation of config
print("Configuration: ", config.serialize(encoding=config.JSON))
# Push traffic configuration constructed so far to OTG
api.set_config(config)
# Start transmitting the packets from configured flow
ts = api.transmit_state()
ts.state = ts.START
api.set_transmit_state(ts)
# Fetch metrics for configured flow
req = api.metrics_request()
req.flow.flow_names = [flow.name]
# and keep polling until either expectation is met or deadline exceeds
start = datetime.datetime.now()
while True:
metrics = api.get_metrics(req)
if (datetime.datetime.now() - start).seconds > 10:
raise Exception("deadline exceeded")
# print YAML representation of flow metrics
print(metrics)
if metrics.flow_metrics[0].transmit == metrics.flow_metrics[0].STOPPED:
break
time.sleep(0.1)
```
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"description": "# \n\n[](https://en.wikipedia.org/wiki/MIT_License)\n[](https://www.repostatus.org/#active)\n[](https://github.com/open-traffic-generator/snappi/actions)\n[](https://lgtm.com/projects/g/open-traffic-generator/snappi/alerts/)\n[](https://lgtm.com/projects/g/open-traffic-generator/snappi/context:python)\n[](https://pypi.org/project/snappi)\n[](https://pypi.python.org/pypi/snappi)\n\nTest scripts written in `snappi`, an auto-generated python SDK, can be executed against any traffic generator conforming to [Open Traffic Generator API](https://github.com/open-traffic-generator/models).\n\n[Ixia-c](https://github.com/open-traffic-generator/ixia-c) is one such reference implementation of Open Traffic Generator API.\n\n> The repository is under active development and is subject to updates. All efforts will be made to keep the updates backwards compatible.\n\n## Setup Client \n \n```sh\npython -m pip install --upgrade snappi \n```\n\n## Start Testing \n\n```python\nimport datetime\nimport time\nimport snappi\nimport pytest\n\n\n@pytest.mark.example\ndef test_quickstart():\n # Create a new API handle to make API calls against OTG\n # with HTTP as default transport protocol\n api = snappi.api(location=\"https://localhost:8443\")\n\n # Create a new traffic configuration that will be set on OTG\n config = api.config()\n\n # Add a test port to the configuration\n ptx = config.ports.add(name=\"ptx\", location=\"veth-a\")\n\n # Configure a flow and set previously created test port as one of endpoints\n flow = config.flows.add(name=\"flow\")\n flow.tx_rx.port.tx_name = ptx.name\n # and enable tracking flow metrics\n flow.metrics.enable = True\n\n # Configure number of packets to transmit for previously configured flow\n flow.duration.fixed_packets.packets = 100\n # and fixed byte size of all packets in the flow\n flow.size.fixed = 128\n\n # Configure protocol headers for all packets in the flow\n eth, ip, udp, cus = flow.packet.ethernet().ipv4().udp().custom()\n\n eth.src.value = \"00:11:22:33:44:55\"\n eth.dst.value = \"00:11:22:33:44:66\"\n\n ip.src.value = \"10.1.1.1\"\n ip.dst.value = \"20.1.1.1\"\n\n # Configure repeating patterns for source and destination UDP ports\n udp.src_port.values = [5010, 5015, 5020, 5025, 5030]\n udp.dst_port.increment.start = 6010\n udp.dst_port.increment.step = 5\n udp.dst_port.increment.count = 5\n\n # Configure custom bytes (hex string) in payload\n cus.bytes = \"\".join([hex(c)[2:] for c in b\"..QUICKSTART SNAPPI..\"])\n\n # Optionally, print JSON representation of config\n print(\"Configuration: \", config.serialize(encoding=config.JSON))\n\n # Push traffic configuration constructed so far to OTG\n api.set_config(config)\n\n # Start transmitting the packets from configured flow\n ts = api.transmit_state()\n ts.state = ts.START\n api.set_transmit_state(ts)\n\n # Fetch metrics for configured flow\n req = api.metrics_request()\n req.flow.flow_names = [flow.name]\n # and keep polling until either expectation is met or deadline exceeds\n start = datetime.datetime.now()\n while True:\n metrics = api.get_metrics(req)\n if (datetime.datetime.now() - start).seconds > 10:\n raise Exception(\"deadline exceeded\")\n # print YAML representation of flow metrics\n print(metrics)\n if metrics.flow_metrics[0].transmit == metrics.flow_metrics[0].STOPPED:\n break\n time.sleep(0.1)\n```\n",
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