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display.go
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display.go
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package main
import (
"./config"
"bytes"
"encoding/json"
"fmt"
"github.com/Masterminds/sprig"
"strings"
"text/template"
"time"
)
const greyEsc = "\033[37m"
const redEsc = "\033[91m"
const greenEsc = "\033[92m"
const yellowEsc = "\033[93m"
const blueEsc = "\033[94m"
const magentaEsc = "\033[95m"
const cyanEsc = "\033[96m"
const whiteEsc = "\033[97m"
const resetEsc = "\033[39;49m"
const debugEsc = blueEsc
const errorEsc = redEsc
const infoEsc = greenEsc
const warnEsc = yellowEsc
const debugLevel = "DEBUG"
const errorLevel = "ERROR"
const fatalLevel = "FATAL"
const infoLevel = "INFO"
const traceLevel = "TRACE"
const warnLevel = "WARN"
const longTimeFormat = "2006-01-02T15:04:05.000Z"
// Format a log message into JSON.
func formatJson(msg logMessage) string {
var text string
buf, _ := json.Marshal(msg.fields)
text = strings.TrimRight(string(buf), "}")
buf, _ = json.Marshal(msg.tags)
text += ",\"tags\":"
text += string(buf)
text += "}"
text = strings.ReplaceAll(text, "\\\"", "\"")
return text
}
// Print a single log message
func printMessage(opts *options, msg logMessage) {
adjustMessage(opts, msg)
var text string
if opts.json {
text = msg.fields[jsonField]
} else {
for _, f := range opts.serverConfig.Formats() {
text = tryFormat(msg, f.Name, f.Format)
if len(text) > 0 {
break
}
}
}
if len(text) > 0 {
if strings.HasPrefix(text, config.NoFormatDefined) {
fmt.Println("stop")
}
fmt.Println(text)
} else {
// Last case fallback in case none of the formats (including the default) match
text = msg.fields[jsonField]
fmt.Println(text)
}
}
// Try to apply a format template.
// returns: empty string if the format failed.
func tryFormat(msg logMessage, tmplName string, tmpl string) string {
var t = template.Must(template.New(tmplName).Funcs(sprig.TxtFuncMap()).Option("missingkey=error").Parse(tmpl))
var result bytes.Buffer
if err := t.Execute(&result, msg.fields); err == nil {
return result.String()
}
return ""
}
// Convert a timestamp to a long time string.
func longTime(t time.Time) string {
t = t.In(time.Local)
return t.Format(longTimeFormat)
}
// "Cleanup" the log message and add helper fields.
func adjustMessage(opts *options, msg logMessage) {
isTty := opts.color
requestPage := msg.fields[requestPageField]
if len(requestPage) > 1 && !strings.HasPrefix(requestPage, "/") {
msg.fields[requestPageField] = "/" + requestPage
}
timestamp := msg.timestamp
msg.fields[longTimestampField] = longTime(timestamp)
classname, _ := opts.serverConfig.MapField(msg.fields, "classname")
if len(classname) > 0 {
msg.fields[shortClassnameField] = createShortClassname(classname)
}
level := normalizeLevel(opts, msg)
constructMessageText(opts, msg)
setupColors(isTty, level, msg)
}
// Setup the colors in the message structure.
func setupColors(isTty bool, level string, msg logMessage) {
if isTty {
computeLevelColor(level, msg)
// Add color escapes
msg.fields[blueField] = blueEsc
msg.fields[redField] = redEsc
msg.fields[greenField] = greenEsc
msg.fields[yellowField] = yellowEsc
msg.fields[greyField] = greyEsc
msg.fields[whiteField] = whiteEsc
msg.fields[cyanField] = cyanEsc
msg.fields[magentaField] = magentaEsc
msg.fields[resetField] = resetEsc
} else {
// Add color escapes
msg.fields[blueField] = ""
msg.fields[redField] = ""
msg.fields[greenField] = ""
msg.fields[yellowField] = ""
msg.fields[greyField] = ""
msg.fields[whiteField] = ""
msg.fields[cyanField] = ""
msg.fields[magentaField] = ""
msg.fields[levelColorField] = ""
msg.fields[resetField] = ""
}
}
// Construct the "best" version of the log messages main text. This will look in multiple fields, attempt to
// append multi-line text (stacktraces) onto the message text, etc.
func constructMessageText(opts *options, msg logMessage) {
const nestedException = "; nested exception "
const newlineNnestedException = ";\nnested exception "
messageText, _ := opts.serverConfig.MapField(msg.fields, "message")
originalMessage, _ := opts.serverConfig.MapField(msg.fields, "full_message")
if len(messageText) == 0 {
messageText = originalMessage
}
if strings.Contains(messageText, nestedException) {
messageText = strings.Replace(messageText, nestedException, newlineNnestedException, -1)
}
if len(originalMessage) > 0 && messageText != originalMessage {
extraInfo := strings.Split(originalMessage, "\n")
if len(extraInfo) == 2 {
messageText = messageText + "\n" + extraInfo[1]
}
if len(extraInfo) > 2 {
messageText = messageText + "\n" + strings.Join(extraInfo[1:len(extraInfo)-1], "\n")
}
}
msg.fields[jsonField] = formatJson(msg)
if len(messageText) == 0 {
messageText = msg.fields[jsonField]
}
// Replace \" with plain "
messageText = strings.ReplaceAll(messageText, "\\\"", "\"")
msg.fields[messageTextField] = messageText
}
// Normalize the "level" of the message.
func normalizeLevel(opts *options, msg logMessage) string {
level, _ := opts.serverConfig.MapField(msg.fields, "level")
level = strings.ToUpper(level)
if strings.HasPrefix(level, "E") {
level = errorLevel
} else if strings.HasPrefix(level, "F") {
level = fatalLevel
} else if strings.HasPrefix(level, "I") {
level = infoLevel
} else if strings.HasPrefix(level, "W") {
level = warnLevel
} else if strings.HasPrefix(level, "D") {
level = debugLevel
} else if strings.HasPrefix(level, "T") {
level = traceLevel
}
msg.fields[computedLevelField] = level
return level
}
// Compute the color that should be used to display the log level in the message output.
func computeLevelColor(level string, msg logMessage) {
var levelColor string
switch level {
case debugLevel, traceLevel:
levelColor = debugEsc
case infoLevel:
levelColor = infoEsc
case warnLevel:
levelColor = warnEsc
case errorLevel, fatalLevel:
levelColor = errorEsc
}
if len(levelColor) > 0 {
msg.fields[levelColorField] = levelColor
} else {
msg.fields[levelColorField] = ""
}
}
// Create a shortened version of the Java classname.
func createShortClassname(classname string) string {
parts := strings.Split(classname, ".")
if len(parts) > 0 {
return parts[len(parts)-1]
}
return classname
}