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prices.go
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prices.go
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package main
import (
"encoding/csv"
"fmt"
"net"
"net/http"
"strconv"
"sync"
"time"
)
const (
// NOTE: At this time only NASDAQ traded stocks are supported
// Yahoo has disabled NYSE for some reason while back
yahooFinURL = "http://finance.yahoo.com/d/quotes.csv?s=%s&f=%s"
// formatting for onlt the ask price [a]
baseFormat = "a"
)
func isStockMarketOpened() bool {
est, _ := time.LoadLocation("EST")
now := time.Now().In(est)
day := now.Weekday()
hr := now.Hour()
// TODO: Market is open from 9:30
return day != 6 && day != 7 && hr >= 9 && hr < 16
}
// updatePrices updates process for all stocks
func updatePrices(stocks []Stock, r chan<- bool) {
var numOfErrors int
var mu sync.Mutex
pauseDuration := time.Duration(stockRefreshMin) * time.Minute
for {
if isStockMarketOpened() {
mu.Lock()
numOfErrors = 0
mu.Unlock()
for _, stock := range stocks {
price, err := getAskPrice(stock.Symbol)
if err != nil {
mu.Lock()
numOfErrors++
mu.Unlock()
logErr.Printf("Error getting prices for: %v - %v", stock.Symbol, err)
continue
}
// save the current price
inserErr := savePrice(price)
if inserErr != nil {
mu.Lock()
numOfErrors++
mu.Unlock()
logErr.Printf("Error on insert: %v - %v", stock.Symbol, inserErr)
continue
}
}
r <- numOfErrors == 0
} else {
logDebug.Print("Stock market closed")
}
time.Sleep(pauseDuration)
}
}
// getAskPrice single stock price data
func getAskPrice(symbol string) (*Price, error) {
data, err := loadSingleStockPrice(symbol)
if err != nil {
return nil, err
}
val, fpErr := strconv.ParseFloat(data[0], 64)
if fpErr != nil {
logErr.Printf("Error while parsing prices: %v - %v", data[0], fpErr)
return nil, fpErr
}
price := &Price{
AskPrice: val,
Symbol: symbol,
SampleOn: time.Now(),
}
return price, nil
}
func getHTTPClient(symbol string) (*http.Client, error) {
tr := &http.Transport{
MaxIdleConns: 10,
IdleConnTimeout: 30 * time.Second,
DisableCompression: true,
Dial: (&net.Dialer{
Timeout: 5 * time.Second,
}).Dial,
TLSHandshakeTimeout: 5 * time.Second,
}
c := &http.Client{
Transport: tr,
Timeout: time.Duration(30 * time.Second),
}
return c, nil
}
// Single stock data request
func loadSingleStockPrice(symbol string) ([]string, error) {
c, cErr := getHTTPClient(symbol)
if cErr != nil {
logErr.Printf("Error creating yahoo client %v", cErr)
return nil, cErr
}
url := fmt.Sprintf(yahooFinURL, symbol, baseFormat)
logDebug.Printf("Stock URL: %v", url)
resp, err := c.Get(url)
if err != nil {
logErr.Printf("Error creating yahoo client %v", err)
return nil, err
}
defer resp.Body.Close()
reader := csv.NewReader(resp.Body)
data, err := reader.Read()
if err != nil {
return nil, err
}
logDebug.Printf("Stock Prices Data: %v", data)
return data, err
}