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Add Docker setup, add environment vars for each flag

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This commit is contained in:
Pim van Pelt
2026-03-25 06:41:13 +01:00
parent 129246d85b
commit d2dcd88c4b
6 changed files with 174 additions and 16 deletions
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44
cmd/collector/main.go
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@@ -10,6 +10,7 @@ import (
"os"
"os/signal"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
@@ -19,14 +20,14 @@ import (
)
func main() {
listen := flag.String("listen", ":9090", "gRPC listen address")
promListen := flag.String("prom-listen", ":9100", "Prometheus metrics listen address (empty to disable)")
logPaths := flag.String("logs", "", "comma-separated log file paths/globs to tail")
logsFile := flag.String("logs-file", "", "file containing one log path/glob per line")
source := flag.String("source", hostname(), "name for this collector (default: hostname)")
v4prefix := flag.Int("v4prefix", 24, "IPv4 prefix length for client bucketing")
v6prefix := flag.Int("v6prefix", 48, "IPv6 prefix length for client bucketing")
scanInterval := flag.Duration("scan-interval", 10*time.Second, "how often to rescan glob patterns for new/removed files")
listen := flag.String("listen", envOr("COLLECTOR_LISTEN", ":9090"), "gRPC listen address (env: COLLECTOR_LISTEN)")
promListen := flag.String("prom-listen", envOr("COLLECTOR_PROM_LISTEN", ":9100"), "Prometheus metrics listen address, empty to disable (env: COLLECTOR_PROM_LISTEN)")
logPaths := flag.String("logs", envOr("COLLECTOR_LOGS", ""), "comma-separated log file paths/globs to tail (env: COLLECTOR_LOGS)")
logsFile := flag.String("logs-file", envOr("COLLECTOR_LOGS_FILE", ""), "file containing one log path/glob per line (env: COLLECTOR_LOGS_FILE)")
source := flag.String("source", envOr("COLLECTOR_SOURCE", hostname()), "name for this collector (env: COLLECTOR_SOURCE, default: hostname)")
v4prefix := flag.Int("v4prefix", envOrInt("COLLECTOR_V4PREFIX", 24), "IPv4 prefix length for client bucketing (env: COLLECTOR_V4PREFIX)")
v6prefix := flag.Int("v6prefix", envOrInt("COLLECTOR_V6PREFIX", 48), "IPv6 prefix length for client bucketing (env: COLLECTOR_V6PREFIX)")
scanInterval := flag.Duration("scan-interval", envOrDuration("COLLECTOR_SCAN_INTERVAL", 10*time.Second), "how often to rescan glob patterns for new/removed files (env: COLLECTOR_SCAN_INTERVAL)")
flag.Parse()
patterns := collectPatterns(*logPaths, *logsFile)
@@ -154,3 +155,30 @@ func hostname() string {
}
return h
}
func envOr(key, def string) string {
if v := os.Getenv(key); v != "" {
return v
}
return def
}
func envOrInt(key string, def int) int {
if v := os.Getenv(key); v != "" {
if n, err := strconv.Atoi(v); err == nil {
return n
}
log.Printf("collector: invalid int for %s=%q, using default %d", key, v, def)
}
return def
}
func envOrDuration(key string, def time.Duration) time.Duration {
if v := os.Getenv(key); v != "" {
if d, err := time.ParseDuration(v); err == nil {
return d
}
log.Printf("collector: invalid duration for %s=%q, using default %s", key, v, def)
}
return def
}