eiac/mosh-go
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server: VT emulator framebuffer diffing

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Replace raw PTY passthrough with proper VT emulator processing.
PTY output feeds into charmbracelet/x/vt, snapshots are diffed
against the last-acked framebuffer using CUP-based positioning.
Fixes character doubling during fast typing.
This commit is contained in:
realrasengan
2026-03-14 20:34:30 -07:00
parent bb08f71e30
commit b8b5994527
6 changed files with 296 additions and 44 deletions
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server_test.go
+14 -6
View File
@@ -8,6 +8,7 @@ import (
"net"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
"testing"
@@ -16,6 +17,13 @@ import (
"github.com/creack/pty"
)
var ansiRe = regexp.MustCompile(`\x1b\[[0-9;?]*[A-Za-z]`)
// stripANSI removes CSI escape sequences from s.
func stripANSI(s string) string {
return ansiRe.ReplaceAllString(s, "")
}
func TestGenerateKey(t *testing.T) {
key, b64, err := GenerateKey()
if err != nil {
@@ -175,13 +183,13 @@ func TestServerE2E(t *testing.T) {
for !found {
select {
case <-deadline:
t.Fatalf("marker not echoed. Got: %q", allOutput)
t.Fatalf("marker not echoed. Got: %q", stripANSI(allOutput))
default:
}
payload := recvClient(500 * time.Millisecond)
if payload != nil {
allOutput += string(payload)
if strings.Contains(allOutput, marker) {
if strings.Contains(stripANSI(allOutput), marker) {
found = true
}
}
@@ -504,14 +512,14 @@ func TestServeRW(t *testing.T) {
for {
select {
case <-deadline:
t.Fatalf("did not receive terminal output via ServeRW, got: %q", allOutput)
t.Fatalf("did not receive terminal output via ServeRW, got: %q", stripANSI(allOutput))
default:
}
payload := recvClient(500 * time.Millisecond)
if payload != nil {
allOutput += string(payload)
}
if strings.Contains(allOutput, "HELLO_RW") {
if strings.Contains(stripANSI(allOutput), "HELLO_RW") {
break
}
sendClient(nil)
@@ -625,14 +633,14 @@ func TestServeRW(t *testing.T) {
for {
select {
case <-deadline2:
t.Fatalf("did not receive terminal output, got: %q", allOutput2)
t.Fatalf("did not receive terminal output, got: %q", stripANSI(allOutput2))
default:
}
payload := recvClient2(500 * time.Millisecond)
if payload != nil {
allOutput2 += string(payload)
}
if strings.Contains(allOutput2, "OUTPUT_OK") {
if strings.Contains(stripANSI(allOutput2), "OUTPUT_OK") {
break
}
sendClient2(nil)