gameserver - index.go

     1  package gameserver
     2  
     3  import (
     4  	"bytes"
     5  	"compress/gzip"
     6  	_ "embed" // required to embed index.gz
     7  	"net/http"
     8  	"time"
     9  
    10  	"vimagination.zapto.org/httpencoding"
    11  	"vimagination.zapto.org/memio"
    12  )
    13  
    14  var (
    15  	//go:embed index.gz
    16  	compressedIndex   []byte
    17  	uncompressedIndex []byte
    18  	indexUpdatedTime  time.Time
    19  	isGzip            = httpencoding.HandlerFunc(func(enc httpencoding.Encoding) bool { return enc == "gzip" })
    20  
    21  	index = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    22  		var b *bytes.Reader
    23  		if httpencoding.HandleEncoding(r, isGzip) {
    24  			b = bytes.NewReader(compressedIndex)
    25  			w.Header().Add("Content-Encoding", "gzip")
    26  		} else {
    27  			b = bytes.NewReader(uncompressedIndex)
    28  		}
    29  		http.ServeContent(w, r, "index.html", indexUpdatedTime, b)
    30  	})
    31  )
    32  
    33  func init() {
    34  	uncompressedIndex = make([]byte, uncompressedSize)
    35  	r := memio.Buffer(compressedIndex)
    36  	g, _ := gzip.NewReader(&r)
    37  	g.Read(uncompressedIndex)
    38  	indexUpdatedTime = time.Unix(indexUpdated, 0)
    39  }