efritz/go-mockgen

package matchers

import (
    "reflect"
)

type callInstance interface {
    Args() []interface{}
    Results() []interface{}
}

var callInstanceInterface = reflect.TypeOf((*callInstance)(nil)).Elem()

func getCallHistory(v interface{}) ([]callInstance, bool) {
    value := reflect.ValueOf(v)
    if !value.IsValid() {
        return nil, false
    }

    method := value.MethodByName("History")
    if !method.IsValid() {
        return nil, false
    }

    if method.Type().NumIn() != 0 || method.Type().NumOut() != 1 {
        return nil, false
    }

    history := method.Call(nil)[0]
    if history.Kind() != reflect.Slice || !history.Type().Elem().Implements(callInstanceInterface) {
        return nil, false
    }

    calls := []callInstance{}
    for i := 0; i < history.Len(); i++ {
        calls = append(calls, history.Index(i).Interface().(callInstance))
    }

    return calls, true
}