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Reworked Example from Datastars SDK for GO Readme
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| package main | |
| import ( | |
| "fmt" | |
| "math" | |
| "math/rand" | |
| "net/http" | |
| "time" | |
| datastar "github.com/starfederation/datastar/sdk/go" | |
| ) | |
| const fps = 60 // Frames per second (test with different values) | |
| const listenAddress = "0.0.0.0:9001" | |
| const cdn = "https://cdn.jsdelivr.net/gh/starfederation/datastar@develop/bundles/datastar.js" | |
| const style = ` | |
| display:flex;flex-direction:column; | |
| background-color:oklch(25.3267% 0.015896 252.417568); | |
| height:100vh; | |
| justify-content:center; | |
| align-items:center; | |
| font-family: | |
| ui-sans-serif, | |
| system-ui, | |
| sans-serif, | |
| 'Apple Color Emoji', | |
| 'Segoe UI Emoji', | |
| 'Segoe UI Symbol', | |
| 'Noto Color Emoji'; | |
| ` | |
| const htmlStr4Sprintf = ` | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta | |
| name="viewport" | |
| content="width=device-width, | |
| initial-scale=1, | |
| maximum-scale=1, | |
| user-scalable=0" | |
| /> | |
| <script type="module" defer src="%s"></script> | |
| </head> | |
| <body style="%s"> | |
| <span id="feed" data-on-load="%s"></span> | |
| </body> | |
| </html> | |
| ` | |
| func main() { | |
| mux := http.NewServeMux() | |
| page := []byte(fmt.Sprintf(htmlStr4Sprintf, cdn, style, datastar.GetSSE("/stream"))) | |
| duration := time.Duration(int(math.Round(1000.0/fps))) * time.Millisecond | |
| pageHandler := func(w http.ResponseWriter, r *http.Request) { | |
| w.Write(page) | |
| } | |
| mux.HandleFunc("GET /", pageHandler) | |
| streamHandler := func(w http.ResponseWriter, r *http.Request) { | |
| fmt.Printf("Client connected from: %s\n", r.RemoteAddr) | |
| ticker := time.NewTicker(duration) | |
| defer ticker.Stop() | |
| sse := datastar.NewSSE(w, r) | |
| for { | |
| select { | |
| case <-r.Context().Done(): | |
| fmt.Println("Client connection closed") | |
| return | |
| case <-ticker.C: | |
| hexString := fmt.Sprintf("%06x\n", rand.Intn(16777216)) // 2^24 = 16777216, 0xFFFFFF | |
| frag := fmt.Sprintf(` | |
| <span id="feed" | |
| style="color:#%s;border:1px solid #%s;border-radius:0.25rem;padding:1rem;" | |
| > | |
| %s | |
| </span>`, | |
| hexString, | |
| hexString, | |
| hexString, | |
| ) | |
| sse.MergeFragments(frag) | |
| } | |
| } | |
| } | |
| mux.HandleFunc("GET /stream", streamHandler) | |
| fmt.Printf("Server listen at: %s and runs at %d fps\n", listenAddress, fps) | |
| if err := http.ListenAndServe(listenAddress, mux); err != nil { | |
| fmt.Printf("Error starting server: %v\n", err) | |
| } | |
| } |
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