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 | codes: {
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13 | FST_ERR_DEC_ALREADY_PRESENT,
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14 | FST_ERR_DEC_MISSING_DEPENDENCY,
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15 | FST_ERR_DEC_AFTER_START
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16 | }
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17 | } = require('./errors')
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18 |
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19 | function decorate (instance, name, fn, dependencies) {
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20 | if (instance.hasOwnProperty(name)) {
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21 | throw new FST_ERR_DEC_ALREADY_PRESENT(name)
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22 | }
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23 |
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24 | if (dependencies) {
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25 | checkDependencies(instance, dependencies)
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26 | }
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27 |
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28 | if (fn && (typeof fn.getter === 'function' || typeof fn.setter === 'function')) {
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29 | Object.defineProperty(instance, name, {
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30 | get: fn.getter,
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31 | set: fn.setter
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32 | })
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33 | } else {
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34 | instance[name] = fn
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35 | }
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36 | }
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37 |
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38 | function decorateFastify (name, fn, dependencies) {
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39 | assertNotStarted(this, name)
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40 | decorate(this, name, fn, dependencies)
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41 | return this
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42 | }
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43 |
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44 | function checkExistence (instance, name) {
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45 | if (name) {
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46 | return name in instance
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47 | }
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48 |
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49 | return instance in this
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50 | }
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51 |
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52 | function checkRequestExistence (name) {
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53 | return checkExistence(this[kRequest].prototype, name)
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54 | }
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55 |
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56 | function checkReplyExistence (name) {
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57 | return checkExistence(this[kReply].prototype, name)
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58 | }
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59 |
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60 | function checkDependencies (instance, deps) {
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61 | for (var i = 0; i < deps.length; i++) {
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62 | if (!checkExistence(instance, deps[i])) {
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63 | throw new FST_ERR_DEC_MISSING_DEPENDENCY(deps[i])
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64 | }
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65 | }
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66 | }
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67 |
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68 | function decorateReply (name, fn, dependencies) {
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69 | assertNotStarted(this, name)
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70 | decorate(this[kReply].prototype, name, fn, dependencies)
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71 | return this
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72 | }
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73 |
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74 | function decorateRequest (name, fn, dependencies) {
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75 | assertNotStarted(this, name)
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76 | decorate(this[kRequest].prototype, name, fn, dependencies)
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77 | return this
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78 | }
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79 |
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80 | function assertNotStarted (instance, name) {
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81 | if (instance[kState].started) {
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82 | throw new FST_ERR_DEC_AFTER_START(name)
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83 | }
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84 | }
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85 |
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86 | module.exports = {
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87 | add: decorateFastify,
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88 | exist: checkExistence,
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89 | existRequest: checkRequestExistence,
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90 | existReply: checkReplyExistence,
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91 | dependencies: checkDependencies,
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92 | decorateReply: decorateReply,
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93 | decorateRequest: decorateRequest
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94 | }
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