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functions.go
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functions.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"net/http"
"os"
"strconv"
"time"
"github.com/joho/godotenv"
)
// Common functions for Comicbot
func downloadFileFromUrl(URL, fileName string) error {
// Get response bytes from url
response, err := http.Get(URL)
if err != nil {
return err
}
defer response.Body.Close()
if response.StatusCode != 200 {
return errors.New("Received non 200 response code: " + strconv.Itoa(response.StatusCode))
}
// Create an empty file
file, err := os.Create(fileName)
if err != nil {
return err
}
defer file.Close()
// Write bytes to file
_, err = io.Copy(file, response.Body)
if err != nil {
return err
}
fmt.Printf("File %s downloaded in current working directory\n", fileName)
return nil
}
func getEnvVar(varName string) string {
godotenv.Load(".env")
value, isSet := os.LookupEnv(varName)
if !isSet || value == "" {
log.Print("Must set environment variable " + varName)
}
return value
}
func getLastComic(comic string, apiUrl string, apiBucket string) int16 {
// Get the previously stored comic
response, err := http.Get("$apiUrl/$apiBucket/$comic")
if err != nil {
log.Fatal("Unable to access " + apiUrl + "/" + apiBucket + " - does it exist?")
}
defer response.Body.Close()
if response.StatusCode != 200 {
log.Fatal("Received non 200 response code: " + strconv.Itoa(response.StatusCode))
}
return 1
}
func sendSlackNotification(webhookUrl string, msg string) error {
slackBody, _ := json.Marshal(SlackRequestBody{Text: msg})
req, err := http.NewRequest(http.MethodPost, webhookUrl, bytes.NewBuffer(slackBody))
if err != nil {
return err
}
req.Header.Add("Content-Type", "application/json")
client := &http.Client{Timeout: 10 * time.Second}
resp, err := client.Do(req)
if err != nil {
return err
}
buf := new(bytes.Buffer)
buf.ReadFrom(resp.Body)
if buf.String() != "ok" {
return errors.New("non-ok response returned from slack")
}
return nil
}