65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"strconv"
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)
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const (
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requestURLFormat string = "https://www.alphavantage.co/query?function=TIME_SERIES_WEEKLY&symbol=%s&apikey=%s"
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)
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var tableFormat = `
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Symbol: %s
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Week | Closing Price
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==========================
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`
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func main() {
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var address string
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flag.StringVar(&address, "address", "0.0.0.0:8080", "the web server's listening address")
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flag.Parse()
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symbol, err := getEnvironment("SYMBOL")
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if err != nil {
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log.Fatalf("ERROR: %v.\n", err)
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}
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apiKey, err := getEnvironment("APIKEY")
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if err != nil {
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log.Fatalf("ERROR: %v.\n", err)
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}
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nWeeksString, err := getEnvironment("NWEEKS")
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if err != nil {
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log.Fatalf("ERROR: %v.\n", err)
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}
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nWeeks, err := strconv.Atoi(nWeeksString)
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if err != nil {
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log.Fatalf("ERROR: Unable to parse the number of days from %s, %v\n", nWeeksString, err)
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}
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http.HandleFunc("/healthcheck", healthCheckHandleFunc)
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http.HandleFunc("/stockprice", stockPriceHandleFunc(apiKey, symbol, nWeeks))
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log.Printf("The web server is listening on %s.\n", address)
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log.Fatal(http.ListenAndServe(address, nil))
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}
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func getEnvironment(key string) (string, error) {
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value := os.Getenv(key)
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if value == "" {
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return "", fmt.Errorf("the environment variable %s is not set", key)
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}
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return value, nil
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}
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