1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
package daemon
import (
"bytes"
"context"
"fmt"
"io"
"log/slog"
"net/http"
"os"
"time"
"codeberg.org/snonux/goprecords/internal/goprecords"
)
type Config struct {
StatsDir string
Addr string
LogOutput io.Writer
}
func routes(statsDir string) http.Handler {
mux := http.NewServeMux()
mux.HandleFunc("/health", health)
mux.HandleFunc("/report", report(statsDir))
return mux
}
func Handler(statsDir string) http.Handler {
return routes(statsDir)
}
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 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)
log, textHandler := newDaemonLogger(w)
srv := &http.Server{
Addr: cfg.Addr,
Handler: withAccessLog(log, routes(cfg.StatsDir)),
ErrorLog: slog.NewLogLogger(textHandler, slog.LevelError),
}
log.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 && err != http.ErrServerClosed {
return fmt.Errorf("shutdown: %w", err)
}
return ctx.Err()
case err := <-errCh:
if 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 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"
default:
return "text/plain; charset=utf-8"
}
}
|
