Steven Polley
61074bfd80
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96 lines
3.3 KiB
Go
96 lines
3.3 KiB
Go
package staticjsonYahooFinance
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import (
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"fmt"
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"net/url"
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"time"
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)
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// A chartResponse response is what we get back from Yahoo Finance
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type chartResponse struct {
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Chart struct {
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Result []struct {
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Meta struct {
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Currency string `json:"currency"`
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Symbol string `json:"symbol"`
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ExchangeName string `json:"exchangeName"`
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InstrumentType string `json:"instrumentType"`
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FirstTradeDate int `json:"firstTradeDate"`
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RegularMarketTime int `json:"regularMarketTime"`
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Gmtoffset int `json:"gmtoffset"`
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Timezone string `json:"timezone"`
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ExchangeTimezoneName string `json:"exchangeTimezoneName"`
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RegularMarketPrice float64 `json:"regularMarketPrice"`
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ChartPreviousClose float64 `json:"chartPreviousClose"`
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PreviousClose float64 `json:"previousClose"`
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Scale int `json:"scale"`
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PriceHint int `json:"priceHint"`
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CurrentTradingPeriod struct {
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Pre struct {
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Timezone string `json:"timezone"`
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Start int `json:"start"`
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End int `json:"end"`
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Gmtoffset int `json:"gmtoffset"`
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} `json:"pre"`
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Regular struct {
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Timezone string `json:"timezone"`
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Start int `json:"start"`
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End int `json:"end"`
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Gmtoffset int `json:"gmtoffset"`
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} `json:"regular"`
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Post struct {
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Timezone string `json:"timezone"`
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Start int `json:"start"`
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End int `json:"end"`
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Gmtoffset int `json:"gmtoffset"`
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} `json:"post"`
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} `json:"currentTradingPeriod"`
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TradingPeriods [][]struct {
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Timezone string `json:"timezone"`
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Start int `json:"start"`
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End int `json:"end"`
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Gmtoffset int `json:"gmtoffset"`
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} `json:"tradingPeriods"`
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DataGranularity string `json:"dataGranularity"`
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Range string `json:"range"`
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ValidRanges []string `json:"validRanges"`
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} `json:"meta"`
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Timestamp []int `json:"timestamp"`
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Indicators struct {
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Quote []struct {
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Volume []any `json:"volume"`
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High []any `json:"high"`
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Close []any `json:"close"`
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Open []any `json:"open"`
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Low []any `json:"low"`
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} `json:"quote"`
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} `json:"indicators"`
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} `json:"result"`
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Error any `json:"error"`
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} `json:"chart"`
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}
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// getChart first checks if the symbol chartCacheEntry is valid,
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// and if not then it downloads fresh chart data
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func (c client) getChart(symbol string) (int, error) {
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if cacheItem, ok := chartCache[symbol]; ok {
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// if the cacheEntry is still valid, use it
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if time.Now().Before(cacheItem.LastUpdated.Add(cacheAgeSeconds)) {
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return int(cacheItem.Chart.Chart.Result[0].Meta.RegularMarketPrice * 1000), nil
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}
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}
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chartResponse := &chartResponse{}
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err := c.get(fmt.Sprintf("/chart/%s", symbol), chartResponse, url.Values{})
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if err != nil {
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return 0, fmt.Errorf("http get request error: %v", err)
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}
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if len(chartResponse.Chart.Result) != 1 {
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return 0, fmt.Errorf("unexpected length of results - expected 1 but got %d", len(chartResponse.Chart.Result))
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}
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chartCache[symbol] = chartCacheEntry{Chart: *chartResponse, LastUpdated: time.Now()}
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return int(chartResponse.Chart.Result[0].Meta.RegularMarketPrice * 1000), nil
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}
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