feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

checks/cwhois/result.go

@@ -0,0 +1,14 @@
+// Package cwhois provides functionality.
+package cwhois
+
+import (
+	"github.com/glebtv/whois"
+
+	"rsgit.ru/rsmon/rsmon/internal/checkresult"
+)
+
+// Result is a result of a check
+type Result struct {
+	checkresult.CheckResult
+	Raw whois.Result
+}

checks/cwhois/whois.go

@@ -0,0 +1,69 @@
+package cwhois
+
+import (
+	"net"
+	"strings"
+	"time"
+
+	"github.com/glebtv/whois"
+	"github.com/weppos/publicsuffix-go/publicsuffix"
+
+	"rsgit.ru/rsmon/rsmon/app/models"
+)
+
+// Perform provides functionality.
+func Perform(c *models.Check) *Result {
+	result := &Result{}
+	result.State = "FAIL"
+	host := c.Monitor.Host
+
+	if host == "localhost" || strings.HasPrefix(host, "localhost:") {
+		result.Warnings = append(result.Warnings, "WHOIS check not possible for localhost, please disable")
+		return result
+	}
+
+	addr := net.ParseIP(host)
+	if addr != nil {
+		result.Warnings = append(result.Warnings, "WHOIS check not possible for ip address, please disable")
+		return result
+	}
+
+	zname, err := publicsuffix.Domain(host)
+	if err != nil {
+		result.Warnings = append(result.Warnings, "Failed to get public suffix: "+err.Error())
+		zname = host
+	}
+	if zname != host {
+		result.Infos = append(result.Infos, "not top level domain, running WHOIS check for "+zname)
+	}
+
+	start := time.Now()
+	response := whois.Whois(zname)
+	result.Raw = *response
+	result.Error = result.Raw.Error
+	if result.Error == nil {
+		result.State = "OK"
+	}
+	result.Duration = time.Since(start)
+
+	if result.Error != nil {
+		result.State = "ERR"
+	}
+
+	if response.Expires.IsZero() {
+		if result.State == "OK" {
+			result.State = "WARN"
+		}
+		result.Warnings = append(result.Warnings, "unable to get whois expiration for "+host)
+		return result
+	}
+	result.Expires = &response.Expires
+	exp := time.Until(*result.Expires).Hours() / 24
+
+	if exp < 3 {
+		result.State = "WARN"
+		result.Warnings = append(result.Warnings, "Domain expires in a few days")
+	}
+
+	return result
+}