mol-range2-gql

range2-ex.ts

	/**
			return $gd_rad_transport_query.make({
				query: $mol_const(query),
				assert: $mol_data_string,
			})
	 */
	class $gd_rad_transport_query<Item> extends $mol_object {
		query() {
			return ''
		}

		limit() {
			return 100
		}

		assert(raw: Item) {
			return raw as Item
		}

		@ $mol_mem
		array_asserter() {
			return $mol_data_array(raw => this.assert(raw))
		}

		@ $mol_mem_key
		fetch_data(offset: number) {
			const raw = this.$.$gd_rad_transport.response({
				path: `${this.query()}&limit=${this.limit()}&offset=${offset}`,
			}).json() as any[]

			return this.array_asserter()(raw)
		}

		count() {
			return Number.POSITIVE_INFINITY as number | undefined
		}

		@ $mol_mem
		fetch_count() {
			const res = this.$.$gd_rad_transport.response({
				method: 'HEAD',
				headers: {
					'Range-Unit': 'items',
					Prefer: 'count-exact',
				},
				path: `${this.query()}`,
			})

			const headers = res.headers()

			const range_str = headers.get('Content-Range')

			const count = Number(range_str?.replace(/\/(\d+)$/, '$1'))
			if (isNaN(count)) return 0

			return count
		}

		@ $mol_mem
		range() {
			return this.$.$mol_range2(
				index => this.fetch_data(Math.floor(index / this.limit()) * this.limit())[index % this.limit()],
				() => this.count() ?? this.fetch_count()
			)
		}
	}