noctra/servtex
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implemented SSE logic

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This commit is contained in:
Maximilian Wagner
2025-12-25 21:10:26 +01:00
parent 891ebe0107
commit a54c4cf9ff
3 changed files with 101 additions and 31 deletions
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6
frontend/templates/body.html
View File

@@ -2,17 +2,17 @@
<body>
<div class="container-fluid h-100 d-flex flex-column">
<div class="row output flex-grow-1">
<div class="col-3 left-sidebar" hx-sse="connect:/sse/status" hx-swap="innerHTML">
<div class="col-3 left-sidebar" hx-sse="connect:/sse on:status" hx-swap="innerHTML">
Status <br>
Last Compilation <br>
Such Info <br>
Much wow
</div>
<div class="col-9 p-0">
<iframe class="pdf-frame" src="servetex.pdf?ts=0" hx-sse="connect:/sse/pdf" hx-swap="outerHTML"></iframe>
<iframe class="pdf-frame" src="servetex.pdf?ts=0" hx-sse="connect:/sse on:pdf" hx-swap="outerHTML"></iframe>
</div>
</div>
<div class="command-out" hx-sse="connect:/sse/status" hx-swap="innerHTML">
<div class="command-out" hx-sse="connect:/sse on:output" hx-swap="innerHTML">
compile start
compile file-x
compile file-y

97
frontend/webserver.go
View File

@@ -1,32 +1,91 @@
package frontend
import (
"net/http"
"fmt"
"time"
"strings"
"net/http"
"net/url"
"git.noctra.dev/noctra/servtex/backend"
"git.noctra.dev/noctra/servtex/globals"
)
// Publishes Meta Information relating to last execution
// Does not use contained Mutex, ignore warning
func SSEStatus(writer http.ResponseWriter, request *http.Request) {
writer.Header().Set("Content-Type", "text/event-stream")
writer.Header().Set("Cache-Control", "no-cache")
writer.Header().Set("Connection", "keep-alive")
fmt.Fprintf(writer, "data: Execution Time: %s\n", globals.LatexExec.Timestamp)
fmt.Fprintf(writer, "data: Execution State: %s\n\n", globals.LatexExec.ExecutionState)
writer.(http.Flusher).Flush()
// Adds necessary Headers for SSE
func sseHeadersAdd(writer *http.ResponseWriter) {
(*writer).Header().Set("Content-Type", "text/event-stream")
(*writer).Header().Set("Cache-Control", "no-cache")
(*writer).Header().Set("Connection", "keep-alive")
}
func SSEOutput(writer http.ResponseWriter, request *http.Request) {
writer.Header().Set("Content-Type", "text/event-stream")
writer.Header().Set("Cache-Control", "no-cache")
writer.Header().Set("Connection", "keep-alive")
// Sends a Ping to keep the connection alive
func ssePing(writer *http.ResponseWriter) {
sseHeadersAdd(writer)
fmt.Fprintf(writer, "data: Execution Time: %s\n", globals.LatexExec.Timestamp)
fmt.Fprintf(writer, "data: Execution State: %s\n\n", globals.LatexExec.ExecutionState)
fmt.Fprintf((*writer), ": ping\n\n")
writer.(http.Flusher).Flush()
(*writer).(http.Flusher).Flush()
}
// Sends new Event
//
// Reads globals.LatexExec
func sseStatusSend(writer *http.ResponseWriter) {
sseHeadersAdd(writer)
fmt.Fprintf((*writer), "event: status\n")
fmt.Fprintf((*writer), "data: Execution Time: %s\n", globals.LatexExec.Timestamp)
fmt.Fprintf((*writer), "data: Execution State: %s\n\n", globals.LatexExec.ExecutionState)
(*writer).(http.Flusher).Flush()
}
// Sends new Event
//
// Reads globals.LatexExec
func ssePDFSend(writer *http.ResponseWriter) {
sseHeadersAdd(writer)
fmt.Fprintf((*writer), "event: pdf\n")
iframe := fmt.Sprintf(
`<iframe class="pdf-frame" src="servetex.pdf?ts=%s" hx-sse="connect:/sse/pdf" hx-swap="outerHTML"></iframe>`,
url.QueryEscape(backend.GetLocalTimeRFC()),
)
fmt.Fprintf((*writer), "data: %s\n\n", iframe)
(*writer).(http.Flusher).Flush()
}
// Sends new Event
//
// Reads globals.LatexExec
func sseOutputSend(writer *http.ResponseWriter) {
sseHeadersAdd(writer)
fmt.Fprintf((*writer), "event: output\n")
lines := strings.SplitSeq(string(globals.LatexExec.Output), "\n")
for line := range lines {
fmt.Fprintf((*writer), "data: %s\n", line)
}
fmt.Fprintf((*writer), "\n")
(*writer).(http.Flusher).Flush()
}
// Server Side Event Handler
//
// Sends a Ping instead of actual data when no new data available to save bandwidth
func SSEEventSender(writer http.ResponseWriter, request *http.Request) {
lastExecution := ""
for range time.Tick(time.Second) {
if lastExecution == globals.LatexExec.Timestamp {
ssePing(&writer)
} else {
sseStatusSend(&writer)
ssePDFSend(&writer)
sseOutputSend(&writer)
// comment out for testing purposes
lastExecution = globals.LatexExec.Timestamp
}
}
}