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IPolicyFactory.cs
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IPolicyFactory.cs
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using Opa.Wasm;
using System.Text.Json;
using Wasmtime;
namespace HigherLevelApisSpike;
public class Policy : IDisposable
{
private bool disposedValue;
private readonly IOpaSerializer _serde;
public OpaPolicy Opa { get; }
public Policy(OpaPolicy opaPolicy, IOpaSerializer serde)
{
Opa = opaPolicy;
_serde = serde;
}
public void SetData(object o)
{
this.Opa.SetData(JsonSerializer.Serialize(o));
}
public string Evaluate(object o)
{
return this.Opa.Evaluate(JsonSerializer.Serialize(o));
}
protected virtual void Dispose(bool disposing)
{
if (!disposedValue)
{
if (disposing)
{
Opa.Dispose();
}
disposedValue = true;
}
}
public void Dispose()
{
Dispose(disposing: true);
GC.SuppressFinalize(this);
}
}
public interface IPolicyStore
{
Task<(byte[], bool)> LoadPolicyAsync(string name, bool throwOnLoadError = false);
}
public class DummyPolicyStore : IPolicyStore
{
public Task<(byte[], bool)> LoadPolicyAsync(string name, bool throwOnLoadError = false)
{
throw new NotImplementedException();
}
}
public interface IOpaSerializer
{
string Serialize(object obj);
T? Deserialize<T>(string json);
}
public class DefaultOpaSerializer : IOpaSerializer
{
public T? Deserialize<T>(string json)
{
return JsonSerializer.Deserialize<T>(json);
}
public string Serialize(object obj)
{
return JsonSerializer.Serialize(obj);
}
}
// Size of module cache is determined by implementation
public interface IOpaModuleCache
{
public Module? Get(string policyName);
public void Add(string policyName, Module module);
}
public class NoOpModuleCache : IOpaModuleCache
{
public void Add(string policyName, Module module)
{
}
public Module? Get(string policyName)
{
return null;
}
}
public class PolicyFactory
{
private readonly IPolicyStore _store;
private readonly IOpaSerializer _serde;
private readonly IOpaModuleCache _moduleCache;
public PolicyFactory(IPolicyStore store, IOpaModuleCache moduleCache, IOpaSerializer serde)
{
_store = store;
_serde = serde;
_moduleCache = moduleCache;
}
public async ValueTask<Policy> GetAsync(string policyName)
{
using var opaRuntime = new OpaRuntime();
Module? module = null;
if (null == (module = _moduleCache.Get(policyName)))
{
// Non-cache case
var (wasmBytes, err) = await _store.LoadPolicyAsync(policyName);
// disposing is the duty of the consumer
module = opaRuntime.Load(policyName, wasmBytes);
_moduleCache.Add(policyName, module);
}
// disposing is the duty of the consumer
var opaPolicy = new OpaPolicy(opaRuntime, module);
return new Policy(opaPolicy, _serde);
}
}