sepia-search-motore-di-ricerca-video/server/helpers/elastic-search.ts

import { Client } from '@elastic/elasticsearch'
import { CONFIG } from '../initializers/constants'
import { IndexableVideo } from '../types/video.model'
import { Avatar } from '@shared/models/avatars/avatar.model'
import { flatMap } from 'lodash'

const client = new Client({ node: 'http://' + CONFIG.ELASTIC_SEARCH.HOSTNAME + ':' + CONFIG.ELASTIC_SEARCH.PORT })

function initVideosIndex () {
  return client.indices.create({
    index: CONFIG.ELASTIC_SEARCH.INDEXES.VIDEOS,
    body: {
      settings: {
        number_of_shards: 1,
        number_of_replicas: 1
      },
      mappings: {
        properties: buildVideosMapping()
      }
    }
  }).catch(err => {
    if (err.name === 'ResponseError' && err.meta?.body?.error.root_cause[0]?.type === 'resource_already_exists_exception') return

    throw err
  })
}

function indexVideos (videos: IndexableVideo[]) {
  const body = flatMap(videos, v => {
    return [
      {
        update: {
          _id: v.elasticSearchId,
          _index: CONFIG.ELASTIC_SEARCH.INDEXES.VIDEOS
        }
      },
      {
        doc: formatVideo(v),
        doc_as_upsert: true
      }
    ]
  })

  return client.bulk({
    index: CONFIG.ELASTIC_SEARCH.INDEXES.VIDEOS,
    body
  })
}

function refreshVideosIndex () {
  return client.indices.refresh({ index: CONFIG.ELASTIC_SEARCH.INDEXES.VIDEOS })
}

async function queryVideos (query: any) {
  const res = await client.search({
    index: CONFIG.ELASTIC_SEARCH.INDEXES.VIDEOS,
    body: {
      query
    }
  })

  return res.body.hits.hits
}

export {
  indexVideos,
  queryVideos,
  refreshVideosIndex,
  initVideosIndex
}

// ############################################################################

function formatVideo (v: IndexableVideo) {
  return {
    uuid: v.uuid,

    createdAt: v.createdAt,
    updatedAt: v.updatedAt,
    publishedAt: v.publishedAt,
    originallyPublishedAt: v.originallyPublishedAt,

    category: {
      id: v.category.id,
      label: v.category.label
    },
    licence: {
      id: v.licence.id,
      label: v.licence.label
    },
    language: {
      id: v.language.id,
      label: v.language.label
    },
    privacy: {
      id: v.privacy.id,
      label: v.privacy.label
    },

    name: v.name,
    description: v.description,
    duration: v.duration,
    thumbnailPath: v.thumbnailPath,
    previewPath: v.previewPath,
    embedPath: v.embedPath,

    views: v.views,
    likes: v.likes,
    dislikes: v.dislikes,

    nsfw: v.nsfw,
    host: v.host,

    account: {
      name: v.account.name,
      displayName: v.account.displayName,
      url: v.account.url,
      host: v.account.host,

      avatar: formatAvatar(v.account)
    },

    channel: {
      name: v.channel.name,
      displayName: v.channel.displayName,
      url: v.channel.url,
      host: v.channel.host,

      avatar: formatAvatar(v.channel)
    }
  }
}

function formatAvatar (obj: { avatar?: Avatar }) {
  if (!obj.avatar) return null

  return {
    path: obj.avatar.path,
    createdAt: obj.avatar.createdAt,
    updatedAt: obj.avatar.updatedAt
  }
}

function buildChannelOrAccountMapping () {
  return {
    name: {
      type: 'text',
      fields: {
        raw: {
          type: 'keyword'
        }
      }
    },
    displayName: {
      type: 'text'
    },
    url: {
      type: 'keyword'
    },
    host: {
      type: 'keyword'
    },

    avatar: {
      properties: {
        path: {
          type: 'keyword'
        },
        createdAt: {
          type: 'date'
        },
        updatedAt: {
          type: 'date'
        }
      }
    }
  }
}

function buildVideosMapping () {
  return {
    uuid: {
      type: 'keyword'
    },
    createdAt: {
      type: 'date'
    },
    updatedAt: {
      type: 'date'
    },
    publishedAt: {
      type: 'date'
    },
    originallyPublishedAt: {
      type: 'date'
    },

    category: {
      properties: {
        id: {
          type: 'keyword'
        },
        label: {
          type: 'text'
        }
      }
    },

    licence: {
      properties: {
        id: {
          type: 'keyword'
        },
        label: {
          type: 'text'
        }
      }
    },

    language: {
      properties: {
        id: {
          type: 'keyword'
        },
        label: {
          type: 'text'
        }
      }
    },

    privacy: {
      properties: {
        id: {
          type: 'keyword'
        },
        label: {
          type: 'text'
        }
      }
    },

    name: {
      type: 'text'
    },

    description: {
      type: 'text'
    },

    duration: {
      type: 'long'
    },

    thumbnailPath: {
      type: 'keyword'
    },
    previewPath: {
      type: 'keyword'
    },
    embedPath: {
      type: 'keyword'
    },

    views: {
      type: 'long'
    },
    likes: {
      type: 'long'
    },
    dislikes: {
      type: 'long'
    },
    nsfw: {
      type: 'boolean'
    },

    host: {
      type: 'keyword'
    },

    account: {
      properties: buildChannelOrAccountMapping()
    },

    channel: {
      properties: buildChannelOrAccountMapping()
    }
  }
}