A module to extract metrics rom TOSCA blueprints
Project description
The static source code measurement tool for Tosca
ToscaMetrics is a Python-based static source code measurement tool to characterize Infrastructure-as-Code. It helps quantify the characteristics of Tosca blueprints to support DevOps engineers when maintaining and evolving it. It currently supports 17 source code metrics, though other metrics can be derived by combining the implemented ones.
How to install
Installation is made simple by the PyPI repository. Download the tool and install it with:
pip install tosca-metrics
or, alternatively from the source code project directory:
pip install -r requirements.txt
pip install .
How to use
Command-line
Run tosca-metrics --help
for instructions about the usage:
usage: tosca-metrics [-h] [--omit-zero-metrics] [-d DEST] [-o] [-v] src
Extract metrics from Ansible scripts.
positional arguments:
src source file (Tosca blueprint) or directory
optional arguments:
-h, --help show this help message and exit
--omit-zero-metrics omit metrics with value equal 0
-d DEST, --dest DEST destination path to save results
-o, --output shows output
-v, --version show program's version number and exit
Assume that the following example is named blueprint1.tosca:
tosca_definitions_version: tosca_simple_yaml_1_0
imports:
- indigo_custom_types: https://raw.githubusercontent.com/indigo-dc/tosca-types/master/custom_types.yaml
description: >
TOSCA example for launching the generic_deepaas mesos job
topology_template:
node_templates:
marathon-job:
type: tosca.nodes.indigo.Container.Application.Docker.Marathon
properties:
uris: []
command: 'deepaas-run --listen-ip 0.0.0.0'
labels:
HAPROXY_GROUP: external
artifacts:
image:
file: deephdc/deep-oc-plant-classification-theano
type: tosca.artifacts.Deployment.Image.Container.Docker
requirements:
- host: docker_runtime
docker_runtime:
type: tosca.nodes.indigo.Container.Runtime.Docker
capabilities:
host:
properties:
num_cpus: 1.0
mem_size: 1024 MB
publish_ports:
- protocol: tcp
source: 5000
outputs:
endpoint:
value: { concat: [ { get_attribute : [ marathon-job, load_balancer_ips, 0 ] }, ':', { get_attribute : [ docker_runtime, host, publish_ports, 0, target ] } ] }
and is located within the folder blueprints as follows:
blueprints
|- blueprint1.yml
|- blueprint2.yml
|- blueprint3.yml
Also, assume the user's working directory is the blueprints folder. Then, it is possible to extract source code characteristics from that blueprint by running the following command:
tosca-metrics --omit-zero-metrics playbook1.yml --dest report.json
For this example, the report.json
will result in
[
{
"filepath": "blueprint1.tosca",
"lines_blank": 7,
"lines_code": 33,
"num_imports": 1,
"num_keys": 35,
"num_node_templates": 2,
"num_properties": 6,
"num_tokens": 68,
"text_entropy": 5.76
}
]
Python
AnsibleMetrics currently supports up to 46 source code metrics, implemented in Python. To extract the value for a given metric follow this pattern:
from toscametrics.<general|blueprint>.metric import Metric
script = 'a valid yaml script'
value = Metric(script).count()
where has to be replaced with the name of the desired metric module to compute the value of a specific metric.
The difference between the general and the blueprint modules is that the blueprint module contains metrics specific
to blueprints (for example, the number of node types), while the general module contains metrics that can be generalized
to other languages (for example, the lines of code).
For example, to count the number of lines of code:
from toscametrics.general.lines_code import LinesCode
blueprint = """
tosca_definitions_version: tosca_simple_yaml_1_0
imports:
- indigo_custom_types: https://raw.githubusercontent.com/indigo-dc/tosca-types/master/custom_types.yaml
description: >
TOSCA example for launching the generic_deepaas mesos job
"""
print('Lines of executable code:', LinesCode(blueprint).count())
To extract the value for all the metrics at once, import the toscametrics.metrics_extractor
package and call the
method extract_all()
(in this case the return value will be a json object):
from toscametrics.metrics_extractor import extract_all
blueprint = """
tosca_definitions_version: tosca_simple_yaml_1_0
imports:
- indigo_custom_types: https://raw.githubusercontent.com/indigo-dc/tosca-types/master/custom_types.yaml
description: >
TOSCA example for launching the generic_deepaas mesos job
"""
metrics = extract_all(blueprint)
print('Lines of executable code:', metrics['lines_code'])
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