ogen tools

A collection of tools to enable ogen to accommodate some specific spec features.

This repo provides post-processing tools to work around known issues until they're fixed upstream. These tools are designed to be able to be able to run on all code without side effects.

Tools

Tool	Description	Issue
ogen-fixnull	Fix null handling in Opt* types	#1358
ogen-fixerror	Preserve error response bodies	-

Packages

Package	Description
ogenerror	Extract status code and body from ogen errors

Quick Start

ogen-fixnull

Fixes JSON decoding errors when APIs return null for nullable $ref fields.

Install:

go install github.com/agentplexus/ogen-tools/cmd/ogen-fixnull@latest

Use:

ogen --package api --target internal/api --clean openapi.json
ogen-fixnull internal/api/oas_json_gen.go

Or without installing:

go run github.com/agentplexus/ogen-tools/cmd/ogen-fixnull@latest internal/api/oas_json_gen.go

See cmd/ogen-fixnull/README.md for detailed documentation.

ogen-fixerror

Preserves error response bodies so they can be read after the response is closed.

Problem: ogen's UnexpectedStatusCodeError contains the *http.Response, but the body gets closed by defer resp.Body.Close() before callers can read it.

Use:

ogen --package api --target internal/api --clean openapi.json
ogen-fixerror internal/api/oas_response_decoders_gen.go

Or without installing:

go run github.com/agentplexus/ogen-tools/cmd/ogen-fixerror@latest internal/api/oas_response_decoders_gen.go

ogenerror

Extract error details from ogen client errors:

import "github.com/agentplexus/ogen-tools/ogenerror"

resp, err := client.SomeMethod(ctx, req)
if err != nil {
    if status := ogenerror.Parse(err); status != nil {
        fmt.Printf("Status: %d, Body: %s\n", status.StatusCode, status.Body)
    }
}

See ogenerror/README.md for detailed documentation.

Typical generate.sh

#!/bin/bash
set -e

# Prerequisites:
#   go install github.com/ogen-go/ogen/cmd/ogen@latest

# Generate API code
ogen --package api --target internal/api --clean openapi.json

# Post-process: Fix ogen bugs
go run github.com/agentplexus/ogen-tools/cmd/ogen-fixnull@latest internal/api/oas_json_gen.go
go run github.com/agentplexus/ogen-tools/cmd/ogen-fixerror@latest internal/api/oas_response_decoders_gen.go

# Verify
go build ./...

Contributing

Found another ogen issue that needs a workaround? PRs welcome.

License

MIT