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75513575be
* store dependency's in git * since we vendor ... rm tech-depts * aad make target 'vendor' to update vendor folder (manual task)
212 lines
5.3 KiB
Go
212 lines
5.3 KiB
Go
package httptreemux
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import (
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"bufio"
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"encoding/json"
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"html/template"
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"net/http"
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"os"
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"runtime"
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"strings"
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)
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// SimplePanicHandler just returns error 500.
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func SimplePanicHandler(w http.ResponseWriter, r *http.Request, err interface{}) {
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w.WriteHeader(http.StatusInternalServerError)
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}
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// ShowErrorsPanicHandler prints a nice representation of an error to the browser.
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// This was taken from github.com/gocraft/web, which adapted it from the Traffic project.
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func ShowErrorsPanicHandler(w http.ResponseWriter, r *http.Request, err interface{}) {
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const size = 4096
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stack := make([]byte, size)
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stack = stack[:runtime.Stack(stack, false)]
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renderPrettyError(w, r, err, stack)
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}
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func makeErrorData(r *http.Request, err interface{}, stack []byte, filePath string, line int) map[string]interface{} {
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data := map[string]interface{}{
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"Stack": string(stack),
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"Params": r.URL.Query(),
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"Method": r.Method,
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"FilePath": filePath,
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"Line": line,
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"Lines": readErrorFileLines(filePath, line),
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}
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if e, ok := err.(error); ok {
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data["Error"] = e.Error()
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} else {
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data["Error"] = err
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}
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return data
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}
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func renderPrettyError(rw http.ResponseWriter, req *http.Request, err interface{}, stack []byte) {
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_, filePath, line, _ := runtime.Caller(5)
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data := makeErrorData(req, err, stack, filePath, line)
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rw.Header().Set("Content-Type", "text/html")
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rw.WriteHeader(http.StatusInternalServerError)
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tpl := template.Must(template.New("ErrorPage").Parse(panicPageTpl))
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tpl.Execute(rw, data)
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}
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func ShowErrorsJsonPanicHandler(w http.ResponseWriter, r *http.Request, err interface{}) {
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const size = 4096
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stack := make([]byte, size)
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stack = stack[:runtime.Stack(stack, false)]
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_, filePath, line, _ := runtime.Caller(4)
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data := makeErrorData(r, err, stack, filePath, line)
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusInternalServerError)
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json.NewEncoder(w).Encode(data)
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}
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func readErrorFileLines(filePath string, errorLine int) map[int]string {
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lines := make(map[int]string)
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file, err := os.Open(filePath)
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if err != nil {
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return lines
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}
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defer file.Close()
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reader := bufio.NewReader(file)
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currentLine := 0
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for {
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line, err := reader.ReadString('\n')
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if err != nil || currentLine > errorLine+5 {
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break
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}
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currentLine++
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if currentLine >= errorLine-5 {
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lines[currentLine] = strings.Replace(line, "\n", "", -1)
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}
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}
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return lines
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}
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const panicPageTpl string = `
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<html>
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<head>
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<title>Panic</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<style>
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html, body{ padding: 0; margin: 0; }
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header { background: #C52F24; color: white; border-bottom: 2px solid #9C0606; }
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h1 { padding: 10px 0; margin: 0; }
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.container { margin: 0 20px; }
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.error { font-size: 18px; background: #FFCCCC; color: #9C0606; padding: 10px 0; }
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.file-info .file-name { font-weight: bold; }
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.stack { height: 300px; overflow-y: scroll; border: 1px solid #e5e5e5; padding: 10px; }
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table.source {
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width: 100%;
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border-collapse: collapse;
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border: 1px solid #e5e5e5;
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}
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table.source td {
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padding: 0;
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}
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table.source .numbers {
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font-size: 14px;
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vertical-align: top;
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width: 1%;
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color: rgba(0,0,0,0.3);
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text-align: right;
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}
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table.source .numbers .number {
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display: block;
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padding: 0 5px;
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border-right: 1px solid #e5e5e5;
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}
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table.source .numbers .number.line-{{ .Line }} {
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border-right: 1px solid #ffcccc;
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}
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table.source .numbers pre {
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white-space: pre-wrap;
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}
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table.source .code {
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font-size: 14px;
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vertical-align: top;
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}
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table.source .code .line {
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padding-left: 10px;
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display: block;
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}
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table.source .numbers .number,
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table.source .code .line {
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padding-top: 1px;
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padding-bottom: 1px;
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}
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table.source .code .line:hover {
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background-color: #f6f6f6;
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}
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table.source .line-{{ .Line }},
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table.source line-{{ .Line }},
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table.source .code .line.line-{{ .Line }}:hover {
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background: #ffcccc;
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}
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</style>
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</head>
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<body>
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<header>
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<div class="container">
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<h1>Error</h1>
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</div>
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</header>
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<div class="error">
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<p class="container">{{ .Error }}</p>
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</div>
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<div class="container">
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<p class="file-info">
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In <span class="file-name">{{ .FilePath }}:{{ .Line }}</span></p>
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</p>
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<table class="source">
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<tr>
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<td class="numbers">
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<pre>{{ range $lineNumber, $line := .Lines }}<span class="number line-{{ $lineNumber }}">{{ $lineNumber }}</span>{{ end }}</pre>
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</td>
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<td class="code">
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<pre>{{ range $lineNumber, $line := .Lines }}<span class="line line-{{ $lineNumber }}">{{ $line }}<br /></span>{{ end }}</pre>
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</td>
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</tr>
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</table>
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<h2>Stack</h2>
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<pre class="stack">{{ .Stack }}</pre>
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<h2>Request</h2>
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<p><strong>Method:</strong> {{ .Method }}</p>
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<h3>Parameters:</h3>
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<ul>
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{{ range $key, $value := .Params }}
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<li><strong>{{ $key }}:</strong> {{ $value }}</li>
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{{ end }}
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</ul>
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</div>
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</body>
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</html>
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`
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