request all tokens info to cache, create your own price pool

[todo]

aelf-block-api/app/service/token.js

Lines 98 to 103 in 15f0ae3

	// TODO: request all tokens info to cache, create your own price pool
	async getPrices(options) {
	const {
	pairs
	} = options;

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This issue was generated by todo based on a TODO comment in 15f0ae3. It's been assigned to @hzz780 because they committed the code.