713a758c83
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Add a read-only web dashboard at GET / that displays: - Summary counts for all monitored resources - Domain nameserver state with per-NS records and status - Hostname DNS records per authoritative nameserver - TCP port open/closed state with associated hostnames - TLS certificate details (CN, issuer, expiry, status) - Last 100 alerts in reverse chronological order Every data point shows relative age (e.g. '5m ago') for freshness. Page auto-refreshes every 30 seconds via meta refresh. Uses Tailwind CSS via CDN for a dark, technical aesthetic with saturated teals and blues on dark slate. Single page, no navigation. Implementation: - internal/notify/history.go: thread-safe ring buffer (last 100 alerts) - internal/notify/notify.go: record alerts in history before dispatch, refactor SendNotification into smaller dispatch helpers (funlen) - internal/handlers/dashboard.go: template rendering with embedded HTML, helper functions for relative time, record formatting, expiry days - internal/handlers/templates/dashboard.html: Tailwind-styled dashboard - internal/handlers/handlers.go: add State and Notify dependencies - internal/server/routes.go: register GET / dashboard route - README.md: document dashboard and new / endpoint No secrets (webhook URLs, API tokens, notification endpoints) are exposed in the dashboard. closes #82
67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
// Package handlers provides HTTP request handlers.
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package handlers
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import (
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"encoding/json"
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"log/slog"
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"net/http"
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"go.uber.org/fx"
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"sneak.berlin/go/dnswatcher/internal/globals"
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"sneak.berlin/go/dnswatcher/internal/healthcheck"
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"sneak.berlin/go/dnswatcher/internal/logger"
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"sneak.berlin/go/dnswatcher/internal/notify"
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"sneak.berlin/go/dnswatcher/internal/state"
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)
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// Params contains dependencies for Handlers.
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type Params struct {
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fx.In
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Logger *logger.Logger
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Globals *globals.Globals
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Healthcheck *healthcheck.Healthcheck
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State *state.State
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Notify *notify.Service
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}
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// Handlers provides HTTP request handlers.
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type Handlers struct {
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log *slog.Logger
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params *Params
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globals *globals.Globals
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hc *healthcheck.Healthcheck
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state *state.State
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notifyHistory *notify.AlertHistory
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}
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// New creates a new Handlers instance.
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func New(_ fx.Lifecycle, params Params) (*Handlers, error) {
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return &Handlers{
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log: params.Logger.Get(),
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params: ¶ms,
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globals: params.Globals,
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hc: params.Healthcheck,
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state: params.State,
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notifyHistory: params.Notify.History(),
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}, nil
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}
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func (h *Handlers) respondJSON(
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writer http.ResponseWriter,
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_ *http.Request,
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data any,
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status int,
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) {
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writer.Header().Set("Content-Type", "application/json")
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writer.WriteHeader(status)
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if data != nil {
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err := json.NewEncoder(writer).Encode(data)
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if err != nil {
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h.log.Error("json encode error", "error", err)
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}
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}
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}
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