This repository contains a Python package for interacting with the Open Policy Agent project's policy language: Rego.
| module | description |
|---|---|
ast | contains types representing Abstract Syntax Tree (AST) nodes in Rego. |
walk | contains a visitor pattern implementation for ast types. |
import json import requests from rego import ast, walk # Load some pi into OPA as data (yum!) requests.put("http://localhost:8181/v1/data", data=json.dumps({ "pi": 3.14, })) # Use OPA's Compile API to partially evaluate a query. Treat 'input.radius' as unknown. resp = requests.post("http://localhost:8181/v1/compile", json.dumps({ "query": "(data.pi * input.radius * 2) >= input.min_radius", "input": { "min_radius": 4, }, "unknowns": ["input.radius"], })) # Load the resulting set of query ASTs out of the JSON response. tree = resp.json()["result"]["queries"] qs = ast.QuerySet.from_data(tree) # Pretty print the ASTs. walk.pretty_print(qs)In a new terminal:
$ opa run --server In another terminal, run the example.
$ git clone https://github.com/open-policy-agent/rego-python.git $ cd rego-python $ virtualenv env $ source env/bin/activate $ pip install -r example-requirements.txt $ pip install -e . $ python example.pyExample output.
QuerySet (1 queries) Query (1 exprs) Expr Term Ref Term Var(gte) Term Call Term Ref Term Var(mul) Term Call Term Ref Term Var(mul) Term Scalar(3.14) Term Ref Term Var(input) Term Scalar(radius) Term Scalar(2) Term Scalar(4)