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package main
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
)
var httpCache = map[string]string{}
func httpGet(u string) (string, error) {
if cache, ok := httpCache[u]; ok {
return cache, nil
}
if err := os.Mkdir(".http-cache", 0777); err != nil && !os.IsExist(err) {
return "", err
}
cacheFile := filepath.Join(".http-cache", url.QueryEscape(u))
if bs, err := os.ReadFile(cacheFile); err == nil {
httpCache[u] = string(bs)
return httpCache[u], nil
} else if !os.IsNotExist(err) {
return "", err
}
fmt.Printf("GET %q...", u)
resp, err := http.Get(u)
if err != nil {
fmt.Printf(" err\n")
return "", err
}
if resp.StatusCode != http.StatusOK {
fmt.Printf(" err\n")
return "", fmt.Errorf("unexpected HTTP status: %v", resp.Status)
}
bs, err := io.ReadAll(resp.Body)
if err != nil {
fmt.Printf(" err\n")
return "", err
}
fmt.Printf(" ok\n")
if err := os.WriteFile(cacheFile, bs, 0666); err != nil {
return "", err
}
httpCache[u] = string(bs)
return httpCache[u], nil
}
func httpGetJSON(u string, out any) error {
str, err := httpGet(u)
if err != nil {
return err
}
return json.Unmarshal([]byte(str), out)
}
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