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package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"tildegit.org/andinus/cetus/apod"
"tildegit.org/andinus/cetus/background"
"tildegit.org/andinus/cetus/cache"
"tildegit.org/andinus/cetus/notification"
)
func execAPOD() {
apodApi := getEnv("APOD_API", "https://api.nasa.gov/planetary/apod")
apodKey := getEnv("APOD_KEY", "DEMO_KEY")
// reqInfo holds all the parameters that needs to be sent with
// the request. GetJson() will pack apiKey & date in params
// map before sending it to another function. Adding params
// here will not change the behaviour of the function, changes
// have to be made in GetJson() too.
reqInfo = make(map[string]string)
reqInfo["api"] = apodApi
reqInfo["apiKey"] = apodKey
reqInfo["date"] = apodDate
if random {
reqInfo["date"] = apod.RandDate()
}
cacheDir := fmt.Sprintf("%s/%s", cache.GetDir(), "apod")
os.MkdirAll(cacheDir, os.ModePerm)
// Check if the file is available locally, if it is then don't
// download it again and get it from disk
file = fmt.Sprintf("%s/%s.json", cacheDir, reqInfo["date"])
if _, err := os.Stat(file); err == nil {
data, err := ioutil.ReadFile(file)
// Not being able to read from the cache file is a
// small error and the program shouldn't exit but
// should continue after printing the log so that the
// user can investigate it later.
if err != nil {
err = fmt.Errorf("%s%s\n%s",
"apod.go: failed to read file to data: ", file,
err.Error())
log.Println(err)
dlAndCacheAPODBody()
}
body = string(data)
} else if os.IsNotExist(err) {
dlAndCacheAPODBody()
} else {
// If file existed then that is handled by the if
// block, if it didn't exist then that is handled by
// the else if block. If we reach here then that means
// it's Schrödinger's file & something else went
// wrong.
log.Fatal(err)
}
if dump {
fmt.Println(body)
}
res := apod.APOD{}
err = apod.UnmarshalJson(&res, body)
if err != nil {
log.Fatal(err)
}
// res.Msg will be returned when there is error on user input
// or the api server.
if len(res.Msg) != 0 {
fmt.Printf("Message: %s", res.Msg)
os.Exit(1)
}
// Send a desktop notification if notify flag was passed.
if notify {
n := notification.Notif{}
n.Title = res.Title
n.Message = fmt.Sprintf("%s\n\n%s",
res.Date,
res.Explanation)
err = n.Notify()
if err != nil {
log.Println(err)
}
}
if print {
fmt.Printf("Title: %s\n\n", res.Title)
if len(res.Copyright) != 0 {
fmt.Printf("Copyright: %s\n", res.Copyright)
}
fmt.Printf("Date: %s\n\n", res.Date)
fmt.Printf("Media Type: %s\n", res.MediaType)
if res.MediaType == "image" {
fmt.Printf("URL: %s\n\n", res.HDURL)
} else {
fmt.Printf("URL: %s\n\n", res.URL)
}
fmt.Printf("Explanation: %s\n", res.Explanation)
}
// Proceed only if the command was set because if it was fetch
// then it's already finished & should exit now.
if os.Args[1] == "fetch" {
os.Exit(0)
}
// Try to set background only if the media type is an image.
// First it downloads the image to the cache directory and
// then tries to set it with feh. If the download fails then
// it exits with a non-zero exit code.
if res.MediaType != "image" {
os.Exit(0)
}
imgFile := fmt.Sprintf("%s/%s", cacheDir, res.Title)
// Check if the file is available locally, if it is then don't
// download it again and set it from disk.
if _, err := os.Stat(imgFile); os.IsNotExist(err) {
err = background.Download(imgFile, res.HDURL)
if err != nil {
log.Fatal(err)
}
} else {
if err != nil {
log.Fatal(err)
}
}
err = background.SetFromFile(imgFile)
if err != nil {
log.Fatal(err)
}
}
func dlAndCacheAPODBody() {
body, err = apod.GetJson(reqInfo)
if err != nil {
err = fmt.Errorf("%s\n%s",
"apod.go: failed to get json response from api",
err.Error())
log.Fatal(err)
}
// Write body to the cache so that it can be read later.
err = ioutil.WriteFile(file, []byte(body), 0644)
// Not being able to write to the cache file is a small error
// and the program shouldn't exit but should continue after
// printing the log so that the user can investigate it later.
if err != nil {
err = fmt.Errorf("%s%s\n%s",
"apod.go: failed to write body to file: ", file,
err.Error())
log.Println(err)
}
}
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