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1 package logrus
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2
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3 // The following code was sourced and modified from the
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4 // https://github.com/tebeka/atexit package governed by the following license:
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5 //
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6 // Copyright (c) 2012 Miki Tebeka <miki.tebeka@gmail.com>.
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7 //
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8 // Permission is hereby granted, free of charge, to any person obtaining a copy of
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9 // this software and associated documentation files (the "Software"), to deal in
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10 // the Software without restriction, including without limitation the rights to
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11 // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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12 // the Software, and to permit persons to whom the Software is furnished to do so,
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13 // subject to the following conditions:
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14 //
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15 // The above copyright notice and this permission notice shall be included in all
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16 // copies or substantial portions of the Software.
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17 //
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18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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20 // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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21 // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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22 // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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23 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24
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25 import (
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26 "fmt"
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27 "os"
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28 )
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29
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30 var handlers = []func(){}
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31
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32 func runHandler(handler func()) {
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33 defer func() {
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34 if err := recover(); err != nil {
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35 fmt.Fprintln(os.Stderr, "Error: Logrus exit handler error:", err)
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36 }
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37 }()
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38
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39 handler()
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40 }
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41
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42 func runHandlers() {
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43 for _, handler := range handlers {
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44 runHandler(handler)
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45 }
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46 }
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47
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48 // Exit runs all the Logrus atexit handlers and then terminates the program using os.Exit(code)
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49 func Exit(code int) {
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50 runHandlers()
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51 os.Exit(code)
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52 }
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53
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54 // RegisterExitHandler appends a Logrus Exit handler to the list of handlers,
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55 // call logrus.Exit to invoke all handlers. The handlers will also be invoked when
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56 // any Fatal log entry is made.
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57 //
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58 // This method is useful when a caller wishes to use logrus to log a fatal
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59 // message but also needs to gracefully shutdown. An example usecase could be
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60 // closing database connections, or sending a alert that the application is
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61 // closing.
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62 func RegisterExitHandler(handler func()) {
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63 handlers = append(handlers, handler)
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64 }
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65
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66 // DeferExitHandler prepends a Logrus Exit handler to the list of handlers,
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67 // call logrus.Exit to invoke all handlers. The handlers will also be invoked when
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68 // any Fatal log entry is made.
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69 //
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70 // This method is useful when a caller wishes to use logrus to log a fatal
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71 // message but also needs to gracefully shutdown. An example usecase could be
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72 // closing database connections, or sending a alert that the application is
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73 // closing.
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74 func DeferExitHandler(handler func()) {
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75 handlers = append([]func(){handler}, handlers...)
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76 }
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