Created
August 20, 2024 11:10
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Simple currency exchanges retrieval script. from USD to BRL,EUR using cli flags
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| package main | |
| import ( | |
| "flag" | |
| "fmt" | |
| "io" | |
| "log" | |
| "net/http" | |
| "os" | |
| ) | |
| var ( | |
| url string | |
| path string | |
| currencies bool | |
| from string | |
| to string | |
| amount float64 | |
| ) | |
| func checkFlags() { | |
| flag.BoolVar(¤cies, "currencies", false, "--currencies=true") | |
| flag.StringVar(&from, "from", "USD", "--from=USD") | |
| flag.StringVar(&to, "to", "BRL,EUR", "--to=BRL,EUR") | |
| flag.Float64Var(&amount, "amount", 0.0, "--amount=1.99") | |
| flag.Parse() | |
| } | |
| func makeRequest(path string) string { | |
| fmt.Println("Please wait... ") | |
| resp, err := http.Get(path) | |
| if err != nil { | |
| log.Fatal(err) | |
| os.Exit(1) | |
| } | |
| defer resp.Body.Close() | |
| body, err := io.ReadAll(resp.Body) | |
| if err != nil { | |
| log.Fatal(err) | |
| os.Exit(1) | |
| } | |
| return string(body) | |
| } | |
| func getCurrencies(url string) string { | |
| path = fmt.Sprintf("%v/currencies", url) | |
| return makeRequest(path) | |
| } | |
| func getLatestAmountFromTo(url string, amount float64, from string, to string) string { | |
| amountValue := "" | |
| if amount > 0 { | |
| amountValue = fmt.Sprintf("amount=%v&", amount) | |
| } | |
| path = fmt.Sprintf("%v/latest?%vfrom=%v&to=%v", url, amountValue, from, to) | |
| return makeRequest(path) | |
| } | |
| func main() { | |
| url = "https://api.frankfurter.app" | |
| checkFlags() | |
| if currencies { | |
| fmt.Println(getCurrencies(url)) | |
| os.Exit(0) | |
| } | |
| fmt.Println(getLatestAmountFromTo(url, amount, from, to)) | |
| os.Exit(0) | |
| } |
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