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New maglevt TUI component: out-of-band VIP health monitor

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A small bubbletea TUI that reads maglev.yaml (repeatable --config),
enumerates every VIP, and probes each from outside the load balancer
on a tight cadence (default 100ms, ±10% jitter). HTTP/HTTPS VIPs get
a GET against a configurable URI (default /.well-known/ipng/healthz)
with per-VIP rolling latency (p50/p95/p99/max), lifetime N/FAIL
counters, LAST status, and a response-header tally. Non-HTTP VIPs
get a TCP connect probe. A bounded error panel classifies anomalies
as timeout / http-err / net-err / spike and auto-sizes to fill the
screen.

Utility: during a failover drill (backend flap, AS drain, config
push) the tally panel shows which backend each VIP is actually
steering to, with two-colour activity highlighting over a 5s
window — white = receiving traffic, grey = drained. Paired with
the rolling OK%/latency columns it gives an at-a-glance answer to
"is the VIP healthy from the outside right now, and which backend
is it hitting", without relying on maglevd's own view of the
world.

Also bumps Makefile/go.mod to build the new binary.
This commit is contained in:
Pim van Pelt
2026-04-15 01:23:34 +02:00
parent 744b1cb3d2
commit 6293521157
8 changed files with 1890 additions and 1 deletions
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5
Makefile
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@@ -1,4 +1,4 @@
BINARIES := maglevd maglevc maglevd-frontend
BINARIES := maglevd maglevc maglevd-frontend maglevt
MODULE := git.ipng.ch/ipng/vpp-maglev
PROTO_DIR := proto
PROTO_FILE := $(PROTO_DIR)/maglev.proto
@@ -63,18 +63,21 @@ build: $(GEN_FILES) $(FRONTEND_WEB_DIST)
go build -ldflags "$(LDFLAGS)" -o build/$(NATIVE_ARCH)/maglevd ./cmd/maglevd/
go build -ldflags "$(LDFLAGS)" -o build/$(NATIVE_ARCH)/maglevc ./cmd/maglevc/
go build -ldflags "$(LDFLAGS)" -o build/$(NATIVE_ARCH)/maglevd-frontend ./cmd/frontend/
go build -ldflags "$(LDFLAGS)" -o build/$(NATIVE_ARCH)/maglevt ./cmd/tester/
build-amd64: $(GEN_FILES) $(FRONTEND_WEB_DIST)
mkdir -p build/amd64
GOOS=linux GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o build/amd64/maglevd ./cmd/maglevd/
GOOS=linux GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o build/amd64/maglevc ./cmd/maglevc/
GOOS=linux GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o build/amd64/maglevd-frontend ./cmd/frontend/
GOOS=linux GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o build/amd64/maglevt ./cmd/tester/
build-arm64: $(GEN_FILES) $(FRONTEND_WEB_DIST)
mkdir -p build/arm64
GOOS=linux GOARCH=arm64 go build -ldflags "$(LDFLAGS)" -o build/arm64/maglevd ./cmd/maglevd/
GOOS=linux GOARCH=arm64 go build -ldflags "$(LDFLAGS)" -o build/arm64/maglevc ./cmd/maglevc/
GOOS=linux GOARCH=arm64 go build -ldflags "$(LDFLAGS)" -o build/arm64/maglevd-frontend ./cmd/frontend/
GOOS=linux GOARCH=arm64 go build -ldflags "$(LDFLAGS)" -o build/arm64/maglevt ./cmd/tester/
# maglevd-frontend-web rebuilds the SolidJS bundle. The Go binary embeds the
# resulting cmd/frontend/web/dist/ via //go:embed, so a `go build` after