1 | 'use strict'
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2 |
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3 |
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4 |
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5 | const {
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6 | kReply,
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7 | kRequest,
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8 | kState
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9 | } = require('./symbols.js')
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10 |
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11 | const {
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12 | FST_ERR_DEC_ALREADY_PRESENT,
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13 | FST_ERR_DEC_MISSING_DEPENDENCY,
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14 | FST_ERR_DEC_AFTER_START
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15 | } = require('./errors')
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16 |
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17 | function decorate (instance, name, fn, dependencies) {
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18 | if (instance.hasOwnProperty(name)) {
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19 | throw new FST_ERR_DEC_ALREADY_PRESENT(name)
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20 | }
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21 |
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22 | if (dependencies) {
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23 | checkDependencies(instance, dependencies)
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24 | }
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25 |
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26 | if (fn && (typeof fn.getter === 'function' || typeof fn.setter === 'function')) {
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27 | Object.defineProperty(instance, name, {
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28 | get: fn.getter,
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29 | set: fn.setter
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30 | })
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31 | } else {
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32 | instance[name] = fn
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33 | }
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34 | }
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35 |
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36 | function decorateFastify (name, fn, dependencies) {
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37 | assertNotStarted(this, name)
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38 | decorate(this, name, fn, dependencies)
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39 | return this
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40 | }
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41 |
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42 | function checkExistence (instance, name) {
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43 | if (name) {
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44 | return name in instance
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45 | }
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46 |
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47 | return instance in this
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48 | }
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49 |
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50 | function checkRequestExistence (name) {
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51 | return checkExistence(this[kRequest].prototype, name)
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52 | }
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53 |
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54 | function checkReplyExistence (name) {
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55 | return checkExistence(this[kReply].prototype, name)
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56 | }
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57 |
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58 | function checkDependencies (instance, deps) {
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59 | for (var i = 0; i < deps.length; i++) {
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60 | if (!checkExistence(instance, deps[i])) {
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61 | throw new FST_ERR_DEC_MISSING_DEPENDENCY(deps[i])
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62 | }
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63 | }
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64 | }
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65 |
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66 | function decorateReply (name, fn, dependencies) {
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67 | assertNotStarted(this, name)
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68 | decorate(this[kReply].prototype, name, fn, dependencies)
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69 | return this
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70 | }
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71 |
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72 | function decorateRequest (name, fn, dependencies) {
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73 | assertNotStarted(this, name)
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74 | decorate(this[kRequest].prototype, name, fn, dependencies)
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75 | return this
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76 | }
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77 |
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78 | function assertNotStarted (instance, name) {
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79 | if (instance[kState].started) {
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80 | throw new FST_ERR_DEC_AFTER_START(name)
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81 | }
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82 | }
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83 |
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84 | module.exports = {
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85 | add: decorateFastify,
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86 | exist: checkExistence,
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87 | existRequest: checkRequestExistence,
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88 | existReply: checkReplyExistence,
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89 | dependencies: checkDependencies,
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90 | decorateReply: decorateReply,
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91 | decorateRequest: decorateRequest
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92 | }
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