genval's Introduction

Tracegen

Generates interface decorators with opentracing support.

Installation

go get github.com/gojuno/tracegen

Example

type Cache interface {
	Set(ctx context.Context, key, value []byte) error
	Get(ctx context.Context, key []byte) (value []byte, err error)
}

tracegen -i Cache -o example/cache_trace.go ./example

Will generate:

type CacheTracer struct {
	next   Cache
	prefix string
}

func NewCacheTracer(next Cache, prefix string) *CacheTracer {
	return &CacheTracer{
		next:   next,
		prefix: prefix,
	}
}

func (t *CacheTracer) Get(in context.Context, in1 []byte) (out []byte, out1 error) {
	span, in := opentracing.StartSpanFromContext(in, t.prefix+".Cache.Get")
	defer func() {
		if out1 != nil {
			ext.Error.Set(span, true)
			span.LogFields(
				log.String("event", "error"),
				log.String("message", out1.Error()),
			)
		}
		span.Finish()
	}()

	return t.next.Get(in, in1)
}

func (t *CacheTracer) Set(in context.Context, in1 []byte, in2 []byte) (out error) {
	span, in := opentracing.StartSpanFromContext(in, t.prefix+".Cache.Set")
	defer func() {
		if out != nil {
			ext.Error.Set(span, true)
			span.LogFields(
				log.String("event", "error"),
				log.String("message", out.Error()),
			)
		}
		span.Finish()
	}()

	return t.next.Set(in, in1, in2)
}

genval's People

Contributors

Stargazers

Watchers

genval's Issues

don`t generated redundant code

In some cases genval generates empty ranges.
Example:

type AliasSlice []string

actual result

// Validate validates AliasSlice
func (r AliasSlice) Validate() error {
	for _, x := range r {
		_ = x
	}
	return nil
}

expected result

// Validate validates AliasSlice
func (r AliasSlice) Validate() error {
	return nil
}

add dot notation for err messages for nested fields.

By default Validate() method will be generated with fields names equal to struct field names.

Also -tags flag will be added, that will accept comma separated list of tags, like -tags json,xml.
For each tag will be generated separate validate method with name Validate<tag_in_upper_case>.

So if we set -tags json,xml 3 methods will be generated: