https://github.com/earthboundkid/resperr
Go package to associate status codes and messages with errors
https://github.com/earthboundkid/resperr
error-handling go http
Last synced: 3 months ago
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Go package to associate status codes and messages with errors
- Host: GitHub
- URL: https://github.com/earthboundkid/resperr
- Owner: earthboundkid
- License: mit
- Created: 2020-06-22T11:26:57.000Z (about 5 years ago)
- Default Branch: master
- Last Pushed: 2022-06-09T17:51:22.000Z (about 3 years ago)
- Last Synced: 2025-02-06T17:21:54.682Z (5 months ago)
- Topics: error-handling, go, http
- Language: Go
- Homepage: https://blog.carlmjohnson.net/post/2020/working-with-errors-as/
- Size: 28.3 KB
- Stars: 23
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# resperr [](https://godoc.org/github.com/earthboundkid/resperr/v2) [](https://goreportcard.com/report/github.com/earthboundkid/resperr/v2) [](https://calver.org)
Resperr is a Go package to associate status codes and messages with errors.
## Example usage
See [blog post](https://blog.carlana.net/post/2020/working-with-errors-as/) for a full description or [read the test code](https://github.com/earthboundkid/resperr/blob/master/example_test.go) for more context:
```go
// write a simple handler that just checks for errors
// and replies with an error object if it gets one
func myHandler(w http.ResponseWriter, r *http.Request) {
// ... check user permissions...
if err := hasPermissions(r); err != nil {
replyError(w, r, err)
return
}
// ...validate request...
n, err := getItemNoFromRequest(r)
if err != nil {
replyError(w, r, err)
return
}
// ...get the data ...
item, err := getItemByNumber(n)
if err != nil {
replyError(w, r, err)
return
}
replyJSON(w, r, http.StatusOK, item)
}
// in the functions that your handler calls
// use resp err to associate different error conditions
// with appropriate HTTP status codes
func getItemByNumber(n int) (item *Item, err error) {
item, err = dbCall("...", n)
if err == sql.ErrNoRows {
// this is an anticipated 404
return nil, resperr.New(
http.StatusNotFound,
"%d not found", n)
}
if err != nil {
// this is an unexpected 500!
return nil, err
}
// ...
return
}
// you can also return specific messages for users as needed
func getItemNoFromRequest(r *http.Request) (int, error) {
var v resperr.Validator
ns := r.URL.Query().Get("n")
v.AddIf("n", ns == "", "Please enter a number.")
n, err := strconv.Atoi(ns)
v.AddIfUnset("n", err != nil, "Input is not a number.")
return n, v.Err()
}
func hasPermissions(r *http.Request) error {
// lol, don't do this!
user := r.URL.Query().Get("user")
if user == "admin" {
return nil
}
return resperr.New(http.StatusForbidden,
"bad user %q", user)
}
```