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https://github.com/open-policy-agent/opa.git
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Anders Eknert
87 lines
2.8 KiB
Markdown
87 lines
2.8 KiB
Markdown
---
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title: Debugging Tips
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kind: envoy
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weight: 110
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---
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This page provides some pointers that could assist in addressing issues encountered while using the
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OPA-Envoy plugin. If none of these tips work, feel free to join
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[slack.openpolicyagent.org](https://slack.openpolicyagent.org) and ask for help.
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## Debugging Performance Issues
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### Benchmarking Queries
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The `opa bench` command evaluates a Rego query multiple times and reports metrics. You can also profile your polices using
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`opa eval` to understand expression evaluation time. More information on improving policy performance can be found [here](https://www.openpolicyagent.org/docs/latest/policy-performance/).
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### Analyzing Decision Logs
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The OPA-Envoy plugin logs every decision that it makes. These logs contain lots of useful information including metrics like
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gRPC server handler time and Rego query evaluation time which can help in measuring the OPA-Envoy plugin's performance.
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To enable local console logging of decisions see [this](https://www.openpolicyagent.org/docs/latest/management-decision-logs/#local-decision-logs).
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### Envoy External Authorization Filter Configuration
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Envoy's External authorization gRPC service configuration uses either Envoy’s in-built gRPC client, or the Google C++ gRPC client.
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From the [benchmarking](../envoy-performance#opa-benchmarks) results, lower latency numbers are seen while using Envoy’s gRPC client versus Google's. Experimenting
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with the gRPC service configuration may help in improving performance.
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The filter configuration also has a `status_on_error` field that can be used to indicate a network error between the filter
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and the OPA-Envoy plugin. The default status on such an error is HTTP `403 Forbidden`. Changing the default value of this
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field will help uncover potential network issues as `403 Forbidden` is also generated when a request is denied.
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## Interacting with the gRPC server
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This section provides examples of interacting with the Envoy External Authorization gRPC server using the [grpcurl](https://github.com/fullstorydev/grpcurl) tool.
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* List all services exposed by the server
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```bash
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$ grpcurl -plaintext localhost:9191 list
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```
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Output:
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```bash
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envoy.service.auth.v2.Authorization
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envoy.service.auth.v3.Authorization
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grpc.reflection.v1alpha.ServerReflection
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```
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* Invoke a v3 Check RPC on the server
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```bash
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$ grpcurl -plaintext -d '
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{
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"attributes": {
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"request": {
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"http": {
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"method": "GET",
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"path": "/api/v1/products"
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}
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}
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}
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}' localhost:9191 envoy.service.auth.v3.Authorization/Check
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```
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Output:
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```json
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{
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"status": {
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},
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"okResponse": {
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"headers": [
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{
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"header": {
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"key": "x-ext-auth-allow",
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"value": "yes"
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}
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}
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]
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}
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}
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```
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