feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

checks/cssh/cssh.go

@@ -0,0 +1,49 @@
+// Package cssh provides functionality.
+package cssh
+
+import (
+	"bufio"
+	"errors"
+	"net"
+	"strings"
+	"time"
+
+	"rsgit.ru/rsmon/rsmon/app/models"
+)
+
+const stateERR = "ERR"
+
+// Perform provides functionality.
+func Perform(c *models.Check) *Result {
+	result := &Result{}
+	port := c.GetSettings().Port
+	if port == "" {
+		port = "22"
+	}
+	result.State = "START"
+	client := &net.Dialer{
+		Timeout:   60 * time.Second,
+		DualStack: true,
+	}
+	start := time.Now()
+	conn, err := client.Dial("tcp", net.JoinHostPort(c.Monitor.Host, port))
+	if err != nil {
+		result.State = stateERR
+		result.Error = err
+		result.Duration = time.Since(start)
+		return result
+	}
+	result.Duration = time.Since(start)
+	status, err := bufio.NewReader(conn).ReadString('\n')
+	if err != nil {
+		result.State = stateERR
+		result.Error = err
+	}
+	if strings.Contains(status, "SSH") {
+		result.State = "OK"
+	} else {
+		result.State = stateERR
+		result.Error = errors.New("it's not SSH")
+	}
+	return result
+}

checks/cssh/result.go

@@ -0,0 +1,10 @@
+package cssh
+
+import (
+	"rsgit.ru/rsmon/rsmon/internal/checkresult"
+)
+
+// Result is a result of a check
+type Result struct {
+	checkresult.CheckResult
+}