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errors.go
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errors.go
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package buffalo
import (
"encoding/json"
"fmt"
"strings"
"github.com/gobuffalo/plush"
"github.com/pkg/errors"
)
// HTTPError a typed error returned by http Handlers and used for choosing error handlers
type HTTPError struct {
Status int `json:"status"`
Cause error `json:"error"`
}
func (h HTTPError) Error() string {
return h.Cause.Error()
}
// ErrorHandler interface for handling an error for a
// specific status code.
type ErrorHandler func(int, error, Context) error
// ErrorHandlers is used to hold a list of ErrorHandler
// types that can be used to handle specific status codes.
/*
a.ErrorHandlers[500] = func(status int, err error, c buffalo.Context) error {
res := c.Response()
res.WriteHeader(status)
res.Write([]byte(err.Error()))
return nil
}
*/
type ErrorHandlers map[int]ErrorHandler
// Get a registered ErrorHandler for this status code. If
// no ErrorHandler has been registered, a default one will
// be returned.
func (e ErrorHandlers) Get(status int) ErrorHandler {
if eh, ok := e[status]; ok {
return eh
}
return defaultErrorHandler
}
// PanicHandler recovers from panics gracefully and calls
// the error handling code for a 500 error.
func (a *App) PanicHandler(next Handler) Handler {
return func(c Context) error {
defer func() { //catch or finally
r := recover()
var err error
if r != nil { //catch
switch t := r.(type) {
case error:
err = errors.WithStack(t)
case string:
err = errors.WithStack(errors.New(t))
default:
err = errors.New(fmt.Sprint(t))
}
eh := a.ErrorHandlers.Get(500)
eh(500, err, c)
}
}()
return next(c)
}
}
func defaultErrorHandler(status int, err error, c Context) error {
env := c.Value("env")
c.Logger().Error(err)
if env != nil && env.(string) == "production" {
c.Response().WriteHeader(status)
c.Response().Write([]byte(prodErrorTmpl))
return nil
}
c.Response().WriteHeader(status)
msg := fmt.Sprintf("%+v", err)
ct := c.Request().Header.Get("Content-Type")
switch strings.ToLower(ct) {
case "application/json", "text/json", "json":
err = json.NewEncoder(c.Response()).Encode(map[string]interface{}{
"error": msg,
"code": status,
})
case "application/xml", "text/xml", "xml":
default:
data := map[string]interface{}{
"routes": c.Value("routes"),
"error": msg,
"status": status,
"data": c.Data(),
"context": c,
}
ctx := plush.NewContextWith(data)
t, err := plush.Render(devErrorTmpl, ctx)
if err != nil {
return errors.WithStack(err)
}
res := c.Response()
_, err = res.Write([]byte(t))
return err
}
return err
}
var devErrorTmpl = `
<html>
<head>
<title><%= status %> - ERROR!</title>
<link rel="stylesheet" href="/assets/application.css" type="text/css" media="all">
<style>
.container {
min-width: 320px;
}
body {
font-family: helvetica;
}
table {
font-size: 14px;
}
table.table tbody tr td {
border-top: 0;
padding: 10px;
}
pre {
white-space: pre-line;
margin-bottom: 10px;
max-height: 275px;
overflow: scroll;
}
header {
background-color: #ed605e;
padding: 10px 20px;
box-sizing: border-box;
}
.logo img {
width: 80px;
}
.titles h1 {
font-size: 30px;
font-weight: 300;
color: white;
margin: 24px 0;
}
.content h3 {
color: gray;
margin: 25px 0;
}
.centered {
text-align: center;
}
.foot {
padding: 5px 0 20px;
text-align: right;
text-align: right;
color: #c5c5c5;
font-weight: 300;
}
.foot a {
color: #8b8b8b;
text-decoration: underline;
}
.centered {
text-align: center;
}
@media all and (max-width: 500px) {
.titles h1 {
font-size: 25px;
margin: 26px 0;
}
}
@media all and (max-width: 530px) {
.titles h1 {
font-size: 20px;
margin: 24px 0;
}
.logo {
padding: 0
}
.logo img {
width: 100%;
max-width: 80px;
}
}
</style>
</head>
<body>
<header>
<div class="container">
<div class="row">
<div class="col-md-1 col-sm-2 col-xs-3 logo">
<a href="/"><img src="/assets/images/logo.svg" alt=""></a>
</div>
<div class="col-md-10 col-sm-6 col-xs-7 titles">
<h1>
<%= status %> - ERROR!
</h1>
</div>
</div>
</div>
</header>
<div class="container content">
<div class="row">
<div class="col-md-12">
<h3>Error Trace</h3>
<pre><%= error %></pre>
<h3>Context</h3>
<pre><%= inspect(context) %></pre>
<h3>Routes</h3>
<table class="table table-striped">
<thead>
<tr text-align="left">
<th class="centered">METHOD</th>
<th>PATH</th>
<th>NAME</th>
<th>HANDLER</th>
</tr>
</thead>
<tbody>
<%= for (r) in routes { %>
<tr>
<td class="centered">
<%= r.Method %>
</td>
<td>
<%= r.Path %>
</td>
<td>
<%= r.PathName %>
</td>
<td><code><%= r.HandlerName %></code></td>
</tr>
<% } %>
</tbody>
</table>
</div>
</div>
<div class="foot"> <span> Powered by <a href="http://gobuffalo.io/">gobuffalo.io</a></span></div>
</div>
</body>
</html>
`
var prodErrorTmpl = `
<h1>We're Sorry!</h1>
<p>
It looks like something went wrong! Don't worry, we are aware of the problem and are looking into it.
</p>
<p>
Sorry if this has caused you any problems. Please check back again later.
</p>
`