55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
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package token
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import (
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"io/ioutil"
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"net/http"
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"time"
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)
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type uniswapStore struct {
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client *http.Client
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tokensFetched bool
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}
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const uniswapTokensURL = "https://gateway.ipfs.io/ipns/tokens.uniswap.org" // nolint:gosec
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const tokenListSchemaURL = "https://uniswap.org/tokenlist.schema.json" // nolint:gosec
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func newUniswapStore() *uniswapStore {
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return &uniswapStore{client: &http.Client{Timeout: time.Minute}, tokensFetched: false}
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}
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func (ts *uniswapStore) doQuery(url string) (*http.Response, error) {
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return ts.client.Get(url)
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}
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func (ts *uniswapStore) areTokensFetched() bool {
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return ts.tokensFetched
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}
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func (ts *uniswapStore) GetTokens() ([]*Token, error) {
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resp, err := ts.doQuery(uniswapTokensURL)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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// In an unlikely case when token list is fetched fine,
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// but fails to validate against the schema, we don't want
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// to refetch the tokens on every GetTokens call as it will
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// still fail but will be wasting CPU cycles until restart,
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// so lets keep tokensFetched before validate() call
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ts.tokensFetched = true
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_, err = validateDocument(string(body), tokenListSchemaURL)
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if err != nil {
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return nil, err
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}
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return bytesToTokens(body)
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}
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