1 | 'use strict'
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2 |
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3 | const applicationHooks = [
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4 | 'onRoute',
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5 | 'onRegister',
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6 | 'onReady',
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7 | 'onClose'
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8 | ]
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9 | const lifecycleHooks = [
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10 | 'onTimeout',
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11 | 'onRequest',
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12 | 'preParsing',
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13 | 'preValidation',
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14 | 'preSerialization',
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15 | 'preHandler',
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16 | 'onSend',
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17 | 'onResponse',
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18 | 'onError'
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19 | ]
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20 | const supportedHooks = lifecycleHooks.concat(applicationHooks)
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21 | const {
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22 | FST_ERR_HOOK_INVALID_TYPE,
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23 | FST_ERR_HOOK_INVALID_HANDLER,
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24 | FST_ERR_SEND_UNDEFINED_ERR
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25 | } = require('./errors')
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26 |
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27 | const {
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28 | kReplyIsError,
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29 | kChildren,
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30 | kHooks
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31 | } = require('./symbols')
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32 |
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33 | function Hooks () {
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34 | this.onRequest = []
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35 | this.preParsing = []
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36 | this.preValidation = []
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37 | this.preSerialization = []
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38 | this.preHandler = []
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39 | this.onResponse = []
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40 | this.onSend = []
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41 | this.onError = []
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42 | this.onRoute = []
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43 | this.onRegister = []
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44 | this.onReady = []
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45 | this.onTimeout = []
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46 | }
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47 |
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48 | Hooks.prototype.validate = function (hook, fn) {
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49 | if (typeof hook !== 'string') throw new FST_ERR_HOOK_INVALID_TYPE()
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50 | if (typeof fn !== 'function') throw new FST_ERR_HOOK_INVALID_HANDLER()
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51 | if (supportedHooks.indexOf(hook) === -1) {
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52 | throw new Error(`${hook} hook not supported!`)
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53 | }
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54 | }
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55 |
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56 | Hooks.prototype.add = function (hook, fn) {
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57 | this.validate(hook, fn)
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58 | this[hook].push(fn)
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59 | }
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60 |
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61 | function buildHooks (h) {
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62 | const hooks = new Hooks()
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63 | hooks.onRequest = h.onRequest.slice()
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64 | hooks.preParsing = h.preParsing.slice()
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65 | hooks.preValidation = h.preValidation.slice()
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66 | hooks.preSerialization = h.preSerialization.slice()
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67 | hooks.preHandler = h.preHandler.slice()
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68 | hooks.onSend = h.onSend.slice()
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69 | hooks.onResponse = h.onResponse.slice()
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70 | hooks.onError = h.onError.slice()
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71 | hooks.onRoute = h.onRoute.slice()
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72 | hooks.onRegister = h.onRegister.slice()
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73 | hooks.onTimeout = h.onTimeout.slice()
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74 | hooks.onReady = []
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75 | return hooks
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76 | }
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77 |
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78 | function hookRunnerApplication (hookName, boot, server, cb) {
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79 | const hooks = server[kHooks][hookName]
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80 | var i = 0
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81 | var c = 0
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82 |
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83 | next()
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84 |
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85 | function exit (err) {
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86 | if (err) {
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87 | cb(err)
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88 | return
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89 | }
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90 | cb()
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91 | }
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92 |
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93 | function next (err) {
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94 | if (err) {
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95 | exit(err)
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96 | return
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97 | }
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98 |
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99 | if (i === hooks.length && c === server[kChildren].length) {
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100 | if (i === 0 && c === 0) {
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101 | exit()
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102 | } else {
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103 |
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104 | boot(function manageTimeout (err, done) {
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105 |
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106 |
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107 | exit(err)
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108 |
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109 |
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110 | done(err)
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111 | })
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112 | }
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113 | return
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114 | }
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115 |
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116 | if (i === hooks.length && c < server[kChildren].length) {
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117 | const child = server[kChildren][c++]
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118 | hookRunnerApplication(hookName, boot, child, next)
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119 | return
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120 | }
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121 |
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122 | boot(wrap(hooks[i++], server))
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123 | next()
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124 | }
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125 |
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126 | function wrap (fn, server) {
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127 | return function (err, done) {
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128 | if (err) {
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129 | done(err)
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130 | return
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131 | }
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132 |
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133 | if (fn.length === 1) {
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134 | try {
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135 | fn.call(server, done)
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136 | } catch (error) {
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137 | done(error)
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138 | }
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139 | return
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140 | }
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141 |
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142 | const ret = fn.call(server)
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143 | if (ret && typeof ret.then === 'function') {
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144 | ret.then(done, done)
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145 | return
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146 | }
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147 |
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148 | done(err)
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149 | }
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150 | }
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151 | }
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152 |
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153 | function hookRunner (functions, runner, request, reply, cb) {
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154 | var i = 0
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155 |
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156 | function next (err) {
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157 | if (err || i === functions.length) {
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158 | cb(err, request, reply)
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159 | return
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160 | }
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161 |
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162 | const result = runner(functions[i++], request, reply, next)
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163 | if (result && typeof result.then === 'function') {
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164 | result.then(handleResolve, handleReject)
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165 | }
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166 | }
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167 |
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168 | function handleResolve () {
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169 | next()
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170 | }
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171 |
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172 | function handleReject (err) {
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173 | if (!err) {
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174 | err = new FST_ERR_SEND_UNDEFINED_ERR()
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175 | } else if (!(err instanceof Error)) {
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176 | reply[kReplyIsError] = true
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177 | }
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178 | cb(err, request, reply)
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179 | }
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180 |
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181 | next()
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182 | }
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183 |
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184 | function onSendHookRunner (functions, request, reply, payload, cb) {
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185 | var i = 0
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186 |
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187 | function next (err, newPayload) {
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188 | if (err) {
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189 | cb(err, request, reply, payload)
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190 | return
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191 | }
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192 |
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193 | if (newPayload !== undefined) {
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194 | payload = newPayload
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195 | }
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196 |
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197 | if (i === functions.length) {
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198 | cb(null, request, reply, payload)
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199 | return
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200 | }
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201 |
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202 | const result = functions[i++](request, reply, payload, next)
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203 | if (result && typeof result.then === 'function') {
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204 | result.then(handleResolve, handleReject)
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205 | }
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206 | }
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207 |
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208 | function handleResolve (newPayload) {
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209 | next(null, newPayload)
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210 | }
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211 |
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212 | function handleReject (err) {
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213 | cb(err, request, reply, payload)
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214 | }
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215 |
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216 | next()
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217 | }
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218 |
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219 | function hookIterator (fn, request, reply, next) {
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220 | if (reply.sent === true) return undefined
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221 | return fn(request, reply, next)
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222 | }
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223 |
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224 | module.exports = {
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225 | Hooks,
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226 | buildHooks,
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227 | hookRunner,
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228 | onSendHookRunner,
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229 | hookIterator,
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230 | hookRunnerApplication,
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231 | lifecycleHooks
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232 | }
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