feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

internal/netaddr/cidr.go

@@ -0,0 +1,46 @@
+// Package netaddr provides network address utilities for RSMon.
+package netaddr
+
+import (
+	"database/sql/driver"
+	"errors"
+	"net"
+)
+
+// Cidr is a wrapper for transferring CIDR values back and forth easily.
+type Cidr struct {
+	Cidr  net.IPNet
+	Valid bool
+}
+
+// Scan implements the Scanner interface.
+func (c *Cidr) Scan(value interface{}) error {
+	c.Cidr.IP = nil
+	c.Cidr.Mask = nil
+	c.Valid = false
+	if value == nil {
+		c.Valid = false
+		return nil
+	}
+	cidrAsBytes, ok := value.([]byte)
+	if !ok {
+		return errors.New("could not convert scanned value to bytes")
+	}
+	_, parsedIPNet, parseErr := net.ParseCIDR(string(cidrAsBytes))
+	if parseErr != nil {
+		return parseErr
+	}
+	c.Valid = true
+	c.Cidr.IP = parsedIPNet.IP
+	c.Cidr.Mask = parsedIPNet.Mask
+	return nil
+}
+
+// Value implements the driver Valuer interface. Note if c.Valid is false
+// or c.Cidr.IP is nil the database column value will be set to NULL.
+func (c Cidr) Value() (driver.Value, error) {
+	if !c.Valid || c.Cidr.IP == nil {
+		return nil, nil
+	}
+	return []byte(c.Cidr.String()), nil
+}