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package monitor
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"strings"
"time"
"github.com/Fuwn/kaze/internal/config"
)
// HTTPMonitor monitors HTTP and HTTPS endpoints
type HTTPMonitor struct {
name string
monitorType string
target string
interval time.Duration
timeout time.Duration
method string
headers map[string]string
body string
expectedStatus int
verifySSL bool
client *http.Client
}
// NewHTTPMonitor creates a new HTTP/HTTPS monitor
func NewHTTPMonitor(cfg config.MonitorConfig) (*HTTPMonitor, error) {
// Validate target URL
target := cfg.Target
if cfg.Type == "https" && !strings.HasPrefix(target, "https://") {
if strings.HasPrefix(target, "http://") {
target = strings.Replace(target, "http://", "https://", 1)
} else {
target = "https://" + target
}
} else if cfg.Type == "http" && !strings.HasPrefix(target, "http://") && !strings.HasPrefix(target, "https://") {
target = "http://" + target
}
verifySSL := true
if cfg.VerifySSL != nil {
verifySSL = *cfg.VerifySSL
}
// Create HTTP client with custom transport
transport := &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: !verifySSL,
},
DialContext: (&net.Dialer{
Timeout: cfg.Timeout.Duration,
KeepAlive: 30 * time.Second,
}).DialContext,
TLSHandshakeTimeout: 10 * time.Second,
ResponseHeaderTimeout: cfg.Timeout.Duration,
ExpectContinueTimeout: 1 * time.Second,
MaxIdleConns: 100,
MaxIdleConnsPerHost: 10,
IdleConnTimeout: 90 * time.Second,
}
client := &http.Client{
Transport: transport,
Timeout: cfg.Timeout.Duration,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
if len(via) >= 10 {
return fmt.Errorf("too many redirects")
}
return nil
},
}
return &HTTPMonitor{
name: cfg.Name,
monitorType: cfg.Type,
target: target,
interval: cfg.Interval.Duration,
timeout: cfg.Timeout.Duration,
method: cfg.Method,
headers: cfg.Headers,
body: cfg.Body,
expectedStatus: cfg.ExpectedStatus,
verifySSL: verifySSL,
client: client,
}, nil
}
// Name returns the monitor's name
func (m *HTTPMonitor) Name() string {
return m.name
}
// Type returns the monitor type
func (m *HTTPMonitor) Type() string {
return m.monitorType
}
// Target returns the monitor target
func (m *HTTPMonitor) Target() string {
return m.target
}
// Interval returns the check interval
func (m *HTTPMonitor) Interval() time.Duration {
return m.interval
}
// Check performs the HTTP/HTTPS check
func (m *HTTPMonitor) Check(ctx context.Context) *Result {
result := &Result{
MonitorName: m.name,
Timestamp: time.Now(),
}
// Create request
var bodyReader io.Reader
if m.body != "" {
bodyReader = strings.NewReader(m.body)
}
req, err := http.NewRequestWithContext(ctx, m.method, m.target, bodyReader)
if err != nil {
result.Status = StatusDown
result.Error = fmt.Errorf("failed to create request: %w", err)
return result
}
// Set headers
req.Header.Set("User-Agent", "Kaze-Monitor/1.0")
for key, value := range m.headers {
req.Header.Set(key, value)
}
// Perform request and measure response time
start := time.Now()
resp, err := m.client.Do(req)
result.ResponseTime = time.Since(start)
if err != nil {
result.Status = StatusDown
result.Error = fmt.Errorf("request failed: %w", err)
return result
}
defer resp.Body.Close()
// Discard body to allow connection reuse
io.Copy(io.Discard, resp.Body)
result.StatusCode = resp.StatusCode
// Check SSL certificate for HTTPS
if m.monitorType == "https" && resp.TLS != nil && len(resp.TLS.PeerCertificates) > 0 {
cert := resp.TLS.PeerCertificates[0]
result.SSLExpiry = &cert.NotAfter
result.SSLDaysLeft = int(time.Until(cert.NotAfter).Hours() / 24)
}
// Determine status based on response code
if resp.StatusCode == m.expectedStatus {
result.Status = StatusUp
} else if resp.StatusCode >= 200 && resp.StatusCode < 400 {
// Got a success code but not the expected one
result.Status = StatusDegraded
result.Error = fmt.Errorf("unexpected status code: got %d, expected %d", resp.StatusCode, m.expectedStatus)
} else {
result.Status = StatusDown
result.Error = fmt.Errorf("bad status code: %d", resp.StatusCode)
}
// Check for slow response (degraded if > 2 seconds)
if result.Status == StatusUp && result.ResponseTime > 2*time.Second {
result.Status = StatusDegraded
result.Error = fmt.Errorf("slow response: %v", result.ResponseTime)
}
return result
}
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