Add limit to the stack trace to ensure that handlers like hipchat don't exceed their max message size.

Author: joeybloggs

README.md

@@ -1,6 +1,6 @@
 ## log
 <img align="right" src="https://raw.githubusercontent.com/go-playground/log/master/logo.png">
-![Project status](https://img.shields.io/badge/version-3.1.0-green.svg)
+![Project status](https://img.shields.io/badge/version-3.1.1-green.svg)
 [![Build Status](https://semaphoreci.com/api/v1/joeybloggs/log/branches/master/badge.svg)](https://semaphoreci.com/joeybloggs/log)
 [![Coverage Status](https://coveralls.io/repos/github/go-playground/log/badge.svg?branch=master)](https://coveralls.io/github/go-playground/log?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/log)](https://goreportcard.com/report/github.com/go-playground/log)

entry.go

@@ -206,6 +206,9 @@ func (e *Entry) WithFields(fields ...Field) LeveledLogger {
 func (e *Entry) StackTrace() LeveledLogger {
 	trace := make([]byte, 1<<16)
 	n := runtime.Stack(trace, true)
+	if n > 7000 {
+		n = 7000
+	}
 	e.Fields = append(e.Fields, F("stack trace", string(trace[:n])+"\n"))
 	return e
 }

log.go

@@ -255,6 +255,9 @@ func (l *logger) WithFields(fields ...Field) LeveledLogger {
 func (l *logger) StackTrace() LeveledLogger {
 	trace := make([]byte, 1<<16)
 	n := runtime.Stack(trace, true)
+	if n > 7000 {
+		n = 7000
+	}
 	return newEntry(DebugLevel, "", []Field{F("stack trace", string(trace[:n])+"\n")}, skipLevel)
 }
 

pkg.go

@@ -182,6 +182,9 @@ func WithFields(fields ...Field) LeveledLogger {
 func StackTrace() LeveledLogger {
 	trace := make([]byte, 1<<16)
 	n := runtime.Stack(trace, true)
+	if n > 7000 {
+		n = 7000
+	}
 	return newEntry(DebugLevel, "", []Field{F("stack trace", string(trace[:n])+"\n")}, skipLevel)
 }