英文:
Error handling of executed slice of functions in Go
问题
我必须在一个for循环中运行未知数量的函数，并且当出现错误时（当其中一个函数返回错误时），我希望创建有意义的错误。
以下是一些代码：
package storage
import (
"github.com/attilasatan/ankara/engine/indexer"
)
type NewHandler func(*indexer.Document) error
var NewHandlers []NewHandler
func AppendNewHandler(handler NewHandler) {
NewHandlers = append(NewHandlers, handler)
}
func New(document *indexer.Document) (err error) {
for i, handler := range NewHandlers {
err = handler(document)
if err != nil {
err = errors.New(`New Handler error at index ` + string(i) + `
original:
` + err.Error())
return
}
}
return
}
这是我处理错误的解决方案，但我对它不太满意，因为我只返回执行的函数的索引。
我的问题是，我能否收集有关返回非nil错误的函数的更多信息。
同时，任何建议都将不胜感激。
英文:
I must run an unknown number of functions in a for cycle and I want to create meaningful errors when something goes wrong (when error returns from one of them)
Here some code:
package storage
import (
"github.com/attilasatan/ankara/engine/indexer"
)
type NewHandler func(*indexer.Document) error
var NewHandlers []NewHandler
func AppendNewHandler(handler NewHandler) {
NewHandlers = append(NewHandlers, handler)
}
func New(document *indexer.Document) (err error) {
for i, handler := range NewHandlers {
err = handler(document)
if err != nil {
err = errors.New(`New Handler error at index ` + string(i) + `
original:
` + err.Error())
return
}
}
return
}
This is my solution for error handling but i don't feel comfortable with it because I only return the index of the function that I executed.
My question is. Can I collect more information about the function that returned not nil error.
Also any kind of advises would be appreciated.
答案1
得分: 0
使用一个包含函数和任何元数据的结构体，而不仅仅是一个函数。类似这样：
type NewHandler struct {
Handler func(*indexer.Document) error
Data string // 或者其他数据类型
}
同时确保你的切片保存的是指针，因为Go是按值传递的。
var NewHandlers []*NewHandler
然后，在循环中，可以这样使用：
for i, handler := range NewHandlers {
err := handler.Handler(document)
// ...
}
你可以将Data包含在错误信息中。
英文:
Use a struct that contains the func and any metadata instead of just a func. Something like this.
type NewHandler struct {
Handler func(*indexer.Document) error
Data string // or whatever data
}
Also make sure your slice holds pointers because go is pass-by-value.
var NewHandlers []*NewHandler
Then when you for loop, it goes like this.
for i, handler := range NewHandlers {
err = handler.Handler(document)
....
And you can include your Data in the error.
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