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package daemon
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"log"
"log/slog"
"net/http"
"os"
"path/filepath"
"time"
"codeberg.org/snonux/goprecords/internal/authkeys"
"codeberg.org/snonux/goprecords/internal/goprecords"
)
const (
defaultReadHeaderTimeout = 10 * time.Second
defaultReadTimeout = 2 * time.Minute
defaultWriteTimeout = 2 * time.Minute
defaultIdleTimeout = 2 * time.Minute
)
// Config holds settings for the HTTP report/upload daemon.
type Config struct {
StatsDir string
Addr string
AuthDB string
LogOutput io.Writer
}
// NewHandler returns HTTP handlers for daemon routes using the default auth DB
// under statsDir. It returns an error if the auth store cannot be opened.
func NewHandler(statsDir string) (http.Handler, error) {
store, err := openAuthStore(context.Background(), statsDir, "")
if err != nil {
return nil, fmt.Errorf("auth db: %w", err)
}
return routes(statsDir, "", store), nil
}
func routes(statsDir, authDB string, store *authkeys.Store) http.Handler {
mux := http.NewServeMux()
mux.HandleFunc("/health", health)
mux.HandleFunc("/livez", health)
mux.HandleFunc("/readyz", readiness(statsDir, authDB))
mux.HandleFunc("/report", report(statsDir))
mux.Handle("/upload/", uploadHandler(statsDir, store))
return mux
}
func logWriter(cfg Config) io.Writer {
if cfg.LogOutput != nil {
return cfg.LogOutput
}
return os.Stdout
}
func newDaemonLogger(w io.Writer) (*slog.Logger, slog.Handler) {
h := slog.NewTextHandler(w, &slog.HandlerOptions{Level: slog.LevelInfo})
return slog.New(h), h
}
type statusRecorder struct {
http.ResponseWriter
code int
}
func (r *statusRecorder) WriteHeader(status int) {
if r.code == 0 {
r.code = status
}
r.ResponseWriter.WriteHeader(status)
}
func (r *statusRecorder) Write(b []byte) (int, error) {
if r.code == 0 {
r.code = http.StatusOK
}
return r.ResponseWriter.Write(b)
}
func withAccessLog(log *slog.Logger, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
rec := &statusRecorder{ResponseWriter: w}
start := time.Now()
next.ServeHTTP(rec, r)
code := rec.code
if code == 0 {
code = http.StatusOK
}
log.Info("http_request", "method", r.Method, "path", r.URL.Path, "status", code, "duration_ms", time.Since(start).Milliseconds())
})
}
func newDaemonHTTPServer(addr string, handler http.Handler, errLog *log.Logger) *http.Server {
return &http.Server{
Addr: addr,
Handler: handler,
ErrorLog: errLog,
ReadHeaderTimeout: defaultReadHeaderTimeout,
ReadTimeout: defaultReadTimeout,
WriteTimeout: defaultWriteTimeout,
IdleTimeout: defaultIdleTimeout,
}
}
// Run starts the HTTP server for cfg until ctx is canceled, then shuts down gracefully.
func Run(ctx context.Context, cfg Config) error {
if cfg.StatsDir == "" {
return fmt.Errorf("stats directory is required")
}
if cfg.Addr == "" {
return fmt.Errorf("listen address is required")
}
w := logWriter(cfg)
slogLog, textHandler := newDaemonLogger(w)
store, err := openAuthStore(ctx, cfg.StatsDir, cfg.AuthDB)
if err != nil {
return fmt.Errorf("auth db: %w", err)
}
defer store.Close()
srv := newDaemonHTTPServer(cfg.Addr, withAccessLog(slogLog, routes(cfg.StatsDir, cfg.AuthDB, store)),
slog.NewLogLogger(textHandler, slog.LevelError))
slogLog.Info("daemon_listen", "addr", cfg.Addr)
errCh := make(chan error, 1)
go func() { errCh <- srv.ListenAndServe() }()
select {
case <-ctx.Done():
shutCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
_ = srv.Shutdown(shutCtx)
err := <-errCh
if err != nil && !errors.Is(err, http.ErrServerClosed) {
return fmt.Errorf("shutdown: %w", err)
}
return ctx.Err()
case err := <-errCh:
if errors.Is(err, http.ErrServerClosed) {
return nil
}
if err != nil {
return fmt.Errorf("listen %s: %w", cfg.Addr, err)
}
return nil
}
}
func health(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte("ok\n"))
}
func readiness(statsDir, authDB string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
if err := checkReadinessDirs(statsDir, authDB); err != nil {
http.Error(w, err.Error(), http.StatusServiceUnavailable)
return
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte("ok\n"))
}
}
func checkReadinessDirs(statsDir, authDB string) error {
absStats, err := filepath.Abs(statsDir)
if err != nil {
return fmt.Errorf("stats-dir: %w", err)
}
if err := checkDirReadableWritable(absStats); err != nil {
return fmt.Errorf("stats-dir: %w", err)
}
authPath := authDB
if authPath == "" {
authPath = authkeys.DefaultPath(statsDir)
}
absAuth, err := filepath.Abs(authPath)
if err != nil {
return fmt.Errorf("auth-db: %w", err)
}
dbDir := filepath.Clean(filepath.Dir(absAuth))
if dbDir != filepath.Clean(absStats) {
if err := checkDirReadableWritable(dbDir); err != nil {
return fmt.Errorf("auth-db dir: %w", err)
}
}
return nil
}
func checkDirReadableWritable(dir string) error {
fi, err := os.Stat(dir)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return fmt.Errorf("missing")
}
return err
}
if !fi.IsDir() {
return fmt.Errorf("not a directory")
}
f, err := os.Open(dir)
if err != nil {
return fmt.Errorf("not readable: %w", err)
}
_, err = f.Readdirnames(1)
_ = f.Close()
if err != nil && !errors.Is(err, io.EOF) {
return fmt.Errorf("not readable: %w", err)
}
tmp, err := os.CreateTemp(dir, ".goprecords-ready-*")
if err != nil {
return fmt.Errorf("not writable: %w", err)
}
name := tmp.Name()
if err := tmp.Close(); err != nil {
_ = os.Remove(name)
return fmt.Errorf("not writable: %w", err)
}
if err := os.Remove(name); err != nil {
return fmt.Errorf("not writable: %w", err)
}
return nil
}
func report(statsDir string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
cfg, err := goprecords.ParseReportQuery(r.URL.Query())
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
aggr := goprecords.NewAggregator(statsDir)
aggregates, err := aggr.Aggregate(r.Context())
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
var buf bytes.Buffer
if err := goprecords.WriteReports(&buf, aggregates, cfg); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
w.Header().Set("Content-Type", reportContentType(cfg.OutputFormat))
w.WriteHeader(http.StatusOK)
_, _ = w.Write(buf.Bytes())
}
}
func reportContentType(f goprecords.OutputFormat) string {
switch f {
case goprecords.FormatMarkdown:
return "text/markdown; charset=utf-8"
case goprecords.FormatGemtext:
return "text/gemini; charset=utf-8"
case goprecords.FormatHTML:
return "text/html; charset=utf-8"
default:
return "text/plain; charset=utf-8"
}
}
|
