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Improve template error reporting (#23396) #23600

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merged 1 commit into from
Mar 20, 2023
Merged

Improve template error reporting (#23396) #23600

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32 changes: 32 additions & 0 deletions modules/context/context.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,10 @@ import (
"net/http"
"net/url"
"path"
"regexp"
"strconv"
"strings"
texttemplate "text/template"
"time"

"code.gitea.io/gitea/models/db"
Expand Down Expand Up @@ -213,6 +215,8 @@ func (ctx *Context) RedirectToFirst(location ...string) {
ctx.Redirect(setting.AppSubURL + "/")
}

var templateExecutingErr = regexp.MustCompile(`^template: (.*):([1-9][0-9]*):([1-9][0-9]*): executing (?:"(.*)" at <(.*)>: )?`)

// HTML calls Context.HTML and renders the template to HTTP response
func (ctx *Context) HTML(status int, name base.TplName) {
log.Debug("Template: %s", name)
Expand All @@ -228,6 +232,34 @@ func (ctx *Context) HTML(status int, name base.TplName) {
ctx.PlainText(http.StatusInternalServerError, "Unable to find status/500 template")
return
}
if execErr, ok := err.(texttemplate.ExecError); ok {
if groups := templateExecutingErr.FindStringSubmatch(err.Error()); len(groups) > 0 {
errorTemplateName, lineStr, posStr := groups[1], groups[2], groups[3]
target := ""
if len(groups) == 6 {
target = groups[5]
}
line, _ := strconv.Atoi(lineStr) // Cannot error out as groups[2] is [1-9][0-9]*
pos, _ := strconv.Atoi(posStr) // Cannot error out as groups[3] is [1-9][0-9]*
filename, filenameErr := templates.GetAssetFilename("templates/" + errorTemplateName + ".tmpl")
if filenameErr != nil {
filename = "(template) " + errorTemplateName
}
if errorTemplateName != string(name) {
filename += " (subtemplate of " + string(name) + ")"
}
err = fmt.Errorf("%w\nin template file %s:\n%s", err, filename, templates.GetLineFromTemplate(errorTemplateName, line, target, pos))
} else {
filename, filenameErr := templates.GetAssetFilename("templates/" + execErr.Name + ".tmpl")
if filenameErr != nil {
filename = "(template) " + execErr.Name
}
if execErr.Name != string(name) {
filename += " (subtemplate of " + string(name) + ")"
}
err = fmt.Errorf("%w\nin template file %s", err, filename)
}
}
ctx.ServerError("Render failed", err)
}
}
Expand Down
43 changes: 25 additions & 18 deletions modules/templates/htmlrenderer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -118,7 +118,7 @@ func handleGenericTemplateError(err error) (string, []interface{}) {

lineNumber, _ := strconv.Atoi(lineNumberStr)

line := getLineFromAsset(templateName, lineNumber, "")
line := GetLineFromTemplate(templateName, lineNumber, "", -1)

return "PANIC: Unable to compile templates!\n%s in template file %s at line %d:\n\n%s\nStacktrace:\n\n%s", []interface{}{message, filename, lineNumber, log.NewColoredValue(line, log.Reset), log.Stack(2)}
}
Expand All @@ -140,7 +140,7 @@ func handleNotDefinedPanicError(err error) (string, []interface{}) {

lineNumber, _ := strconv.Atoi(lineNumberStr)

line := getLineFromAsset(templateName, lineNumber, functionName)
line := GetLineFromTemplate(templateName, lineNumber, functionName, -1)

return "PANIC: Unable to compile templates!\nUndefined function %q in template file %s at line %d:\n\n%s", []interface{}{functionName, filename, lineNumber, log.NewColoredValue(line, log.Reset)}
}
Expand All @@ -161,7 +161,7 @@ func handleUnexpected(err error) (string, []interface{}) {

lineNumber, _ := strconv.Atoi(lineNumberStr)

line := getLineFromAsset(templateName, lineNumber, unexpected)
line := GetLineFromTemplate(templateName, lineNumber, unexpected, -1)

return "PANIC: Unable to compile templates!\nUnexpected %q in template file %s at line %d:\n\n%s", []interface{}{unexpected, filename, lineNumber, log.NewColoredValue(line, log.Reset)}
}
Expand All @@ -181,14 +181,15 @@ func handleExpectedEnd(err error) (string, []interface{}) {

lineNumber, _ := strconv.Atoi(lineNumberStr)

line := getLineFromAsset(templateName, lineNumber, unexpected)
line := GetLineFromTemplate(templateName, lineNumber, unexpected, -1)

return "PANIC: Unable to compile templates!\nMissing end with unexpected %q in template file %s at line %d:\n\n%s", []interface{}{unexpected, filename, lineNumber, log.NewColoredValue(line, log.Reset)}
}

const dashSeparator = "----------------------------------------------------------------------\n"

func getLineFromAsset(templateName string, targetLineNum int, target string) string {
// GetLineFromTemplate returns a line from a template with some context
func GetLineFromTemplate(templateName string, targetLineNum int, target string, position int) string {
bs, err := GetAsset("templates/" + templateName + ".tmpl")
if err != nil {
return fmt.Sprintf("(unable to read template file: %v)", err)
Expand Down Expand Up @@ -229,23 +230,29 @@ func getLineFromAsset(templateName string, targetLineNum int, target string) str
// If there is a provided target to look for in the line add a pointer to it
// e.g. ^^^^^^^
if target != "" {
idx := bytes.Index(lineBs, []byte(target))

if idx >= 0 {
// take the current line and replace preceding text with whitespace (except for tab)
for i := range lineBs[:idx] {
if lineBs[i] != '\t' {
lineBs[i] = ' '
}
targetPos := bytes.Index(lineBs, []byte(target))
if targetPos >= 0 {
position = targetPos
}
}
if position >= 0 {
// take the current line and replace preceding text with whitespace (except for tab)
for i := range lineBs[:position] {
if lineBs[i] != '\t' {
lineBs[i] = ' '
}
}

// write the preceding "space"
_, _ = sb.Write(lineBs[:idx])
// write the preceding "space"
_, _ = sb.Write(lineBs[:position])

// Now write the ^^ pointer
_, _ = sb.WriteString(strings.Repeat("^", len(target)))
_ = sb.WriteByte('\n')
// Now write the ^^ pointer
targetLen := len(target)
if targetLen == 0 {
targetLen = 1
}
_, _ = sb.WriteString(strings.Repeat("^", targetLen))
_ = sb.WriteByte('\n')
}

// Finally write the footer
Expand Down