-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
250 lines (215 loc) · 6.62 KB
/
main.go
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
package main
import (
"context"
"encoding/json"
"fmt"
"net/http"
"os"
"os/signal"
"sort"
"sync"
"time"
"github.com/alecthomas/kong"
"github.com/gorilla/mux"
influxdb2 "github.com/influxdata/influxdb-client-go/v2"
influxdbApi "github.com/influxdata/influxdb-client-go/v2/api"
"github.com/jackc/pgx/v4/pgxpool"
"github.com/marcelbeumer/go-playground/streamproc/services/aggregator/internal/log"
)
type ServerOpts struct {
Watermark float64 `help:"Number until what is considered low." default:"5.0" env:"WATERMARK"`
Host string `help:"API host." default:"127.0.0.1" env:"HOST" short:"h"`
Port int `help:"API port." default:"9996" env:"PORT" short:"p"`
PostgresHost string `help:"Postgres host." default:"127.0.0.1" env:"POSTGRES_HOST"`
PostgresPort int `help:"Postgres port." default:"5432" env:"POSTGRES_PORT"`
PostgresUser string `help:"Postgres user." default:"user" env:"POSTGRES_USER"`
PostgresPassword string `help:"Postgres password." default:"pass" env:"POSTGRES_PASSWORD"`
PostgresUseSSL string `help:"Postgres use SSL." default:"0" env:"POSTGRES_USE_SSL"`
PostgresDb string `help:"Postgres database." default:"postgres" env:"POSTGRES_DB"`
InfluxDBHost string `help:"InfluxDB host." env:"INFLUXDB_HOST"`
InfluxDBToken string `help:"InfluxDB token." env:"INFLUXDB_TOKEN"`
InfluxDBOrg string `help:"InfluxDB org." env:"INFLUXDB_ORG"`
InfluxDBBucket string `help:"InfluxDB bucket." env:"INFLUXDB_BUCKET"`
Debug bool `help:"Show debug messages." short:"d"`
Disable bool `help:"Disable all processing." env:"DISABLE" short:"x"`
}
type EventType = string
const (
EventTypeLow EventType = "low"
EventTypeHigh EventType = "high"
)
type DataPoint struct {
Time int64 `json:"time"`
Count int64 `json:"count"`
Type EventType `json:"type"`
}
type ResponseBody struct {
Message string `json:"message"`
Points []DataPoint `json:"points"`
}
type Server struct {
opts ServerOpts
logger log.Logger
influxQ influxdbApi.QueryAPI
tsdbPool *pgxpool.Pool
ctx context.Context
cancel context.CancelFunc
}
func NewServer(logger log.Logger, opts ServerOpts) *Server {
return &Server{
logger: logger,
opts: opts,
}
}
func (s *Server) ListenAndServe() error {
opts := s.opts
logger := s.logger
addr := fmt.Sprintf("%s:%d", opts.Host, opts.Port)
logger.Infow("starting server", "addr", addr)
ctx, cancel := context.WithCancel(context.Background())
s.ctx = ctx
s.cancel = cancel
sslmode := "disable"
if s.opts.PostgresUseSSL == "1" {
sslmode = "require"
}
pgAddr := fmt.Sprintf(
"postgresql://%s:%s@%s:%d/%s?sslmode=%s",
s.opts.PostgresUser,
s.opts.PostgresPassword,
s.opts.PostgresHost,
s.opts.PostgresPort,
s.opts.PostgresDb,
sslmode,
)
conn, err := pgxpool.Connect(s.ctx, pgAddr)
if err != nil {
return nil
}
s.tsdbPool = conn
logger.Infow("TSDB set up")
url := fmt.Sprintf("http://%s", s.opts.InfluxDBHost)
client := influxdb2.NewClient(url, s.opts.InfluxDBToken)
s.influxQ = client.QueryAPI(s.opts.InfluxDBOrg)
logger.Infow("influxDB set up")
r := mux.NewRouter()
r.HandleFunc("/", s.readyProbe).Methods("GET")
r.HandleFunc("/api", s.getData).Methods("GET")
logger.Infow("listening", "addr", addr)
return http.ListenAndServe(addr, r)
}
func (s *Server) Shutdown(ctx context.Context) {
s.cancel()
s.tsdbPool.Close()
}
func (s *Server) readyProbe(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "ok")
}
func (s *Server) getData(w http.ResponseWriter, r *http.Request) {
logger := s.logger
if s.opts.Disable {
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(ResponseBody{
Message: "processing disabled, did nothing",
})
return
}
var wg sync.WaitGroup
wg.Add(2)
total := "10m"
step := "10s"
var low []DataPoint
go func() {
defer wg.Done()
query := fmt.Sprintf(`
from(bucket: "%s")
|> range(start: %s)
|> filter(fn: (r) => r._measurement == "event" and r._field == "amount")
|> aggregateWindow(every: %s, fn: count)
`, s.opts.InfluxDBBucket, "-"+total, step)
res, err := s.influxQ.Query(s.ctx, query)
if err != nil {
logger.Error("could not get events from influx", log.Error(err))
}
for res.Next() {
record := res.Record()
value, ok := record.Value().(int64)
if !ok {
logger.Error("offset has wrong data type",
"value", record.Value())
continue
}
low = append(low, DataPoint{
Time: record.Time().UnixMilli(),
Count: value,
Type: EventTypeLow,
})
}
}()
var high []DataPoint
go func() {
defer wg.Done()
query := fmt.Sprintf(`
SELECT time_bucket('%s', "time") AS bucket, count(amount) FROM events
WHERE time > now() - INTERVAL '%s'
GROUP BY bucket
`, step, total)
rows, err := s.tsdbPool.Query(s.ctx, query)
if err != nil {
logger.Error("could not get events from tsdb", log.Error(err))
return
}
defer rows.Close()
for rows.Next() {
var t time.Time
var v int64
if err := rows.Scan(&t, &v); err != nil {
logger.Error("could not scan tsdb row", log.Error(err))
return // give up right away; prevent many more errors
}
high = append(high, DataPoint{
Time: t.UnixMilli(),
Count: v,
Type: EventTypeHigh,
})
}
}()
wg.Wait()
all := make([]DataPoint, 0, len(low)+len(high))
all = append(all, low...)
all = append(all, high...)
sort.Slice(all, func(a, b int) bool {
return all[a].Time < all[b].Time
})
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(ResponseBody{
Message: "ok",
Points: all,
})
}
func main() {
opts := ServerOpts{}
_ = kong.Parse(
&opts,
kong.Name("aggregator"),
kong.UsageOnError(),
)
zl := log.NewZapLogger(os.Stderr, opts.Debug)
log.RedirectStdLog(zl)
logger := log.NewZapLoggerAdapter(zl)
srv := NewServer(logger, opts)
go func() {
if err := srv.ListenAndServe(); err != nil {
logger.Errorw("could not start server", log.Error(err))
os.Exit(1)
}
}()
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
<-c
ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
defer cancel()
srv.Shutdown(ctx)
os.Exit(0)
}