1 | 'use strict';
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2 |
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3 | const uuid = require('uuid/v4');
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4 | const formats = require('formats');
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5 |
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6 | const MESSAGE_TYPE = 'command';
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7 |
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8 | class Command {
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9 | constructor({
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10 | id,
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11 | context,
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12 | aggregate,
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13 | name,
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14 | payload = {},
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15 | metadata = {},
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16 | }) {
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17 | if (!formats.isAlphanumeric(context, { minLength: 1 }))
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18 | throw new Error('Invalid context.');
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19 |
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20 | if (!formats.isObject(aggregate))
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21 | throw new Error('Invalid aggregate.');
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22 |
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23 | if (!formats.isAlphanumeric(aggregate.name, { minLength: 1 }))
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24 | throw new Error('Aggregate name is missing.');
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25 |
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26 | if (!formats.isString(name, { minLength: 1 }))
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27 | throw new Error('Command name is missing.');
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28 |
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29 | if (!formats.isObject(payload))
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30 | throw new Error('Payload must be an object.');
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31 |
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32 | if (!formats.isObject(metadata))
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33 | throw new Error('Metadata must be an object.');
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34 |
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35 | this.context = context;
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36 | this.aggregate = { name: aggregate.name, id: aggregate.id, revision: aggregate.revision };
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37 | this.name = name;
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38 |
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39 | this.id = id || uuid();
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40 |
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41 | this.metadata = {
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42 | ...metadata,
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43 | causationId: metadata.causationId || this.id,
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44 | timestamp: (new Date()).getTime(),
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45 | };
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46 |
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47 | this.payload = payload;
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48 | this.routingKey = 'command';
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49 | }
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50 |
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51 | serialize() {
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52 | return JSON.parse(JSON.stringify(this));
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53 | }
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54 |
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55 | get messageType() {
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56 | return MESSAGE_TYPE;
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57 | }
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58 |
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59 | get fullname() {
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60 | return `${this.context}.${this.aggregate.name}.${this.name}`;
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61 | }
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62 |
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63 | static deserialize({
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64 | id,
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65 | context,
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66 | aggregate,
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67 | name,
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68 | payload = {},
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69 | metadata = {},
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70 | }) {
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71 | return new Command({
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72 | id,
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73 | context,
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74 | aggregate,
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75 | name,
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76 | payload,
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77 | metadata,
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78 | });
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79 | }
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80 |
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81 | static definition() {
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82 | return {
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83 | id: 'id',
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84 | context: 'context',
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85 |
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86 | aggregateId: 'aggregate.id',
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87 | aggregate: 'aggregate.name',
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88 | revision: 'aggregate.revision',
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89 |
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90 | name: 'name',
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91 | payload: 'payload',
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92 |
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93 | meta: 'metadata',
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94 | };
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95 | }
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96 | }
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97 |
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98 | module.exports = Command;
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