refactor: more code cleanup and reorganization

pkg/client/client.go

@@ -0,0 +1,66 @@
+package client
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"net"
+	"net/http"
+	"os"
+	"time"
+)
+
+type Option func(*Params)
+type Params struct {
+	Host        string `yaml:"host"`
+	AccessToken string `yaml:"access-token"`
+	Transport   *http.Transport
+}
+
+func ToParams(opts ...Option) *Params {
+	params := &Params{}
+	for _, opt := range opts {
+		opt(params)
+	}
+	return params
+}
+
+func WithHost(host string) Option {
+	return func(c *Params) {
+		c.Host = host
+	}
+}
+
+func WithAccessToken(token string) Option {
+	return func(c *Params) {
+		c.AccessToken = token
+	}
+}
+
+func WithCertPool(certPool *x509.CertPool) Option {
+	return func(c *Params) {
+		c.Transport = &http.Transport{
+			TLSClientConfig: &tls.Config{
+				RootCAs:            certPool,
+				InsecureSkipVerify: true,
+			},
+			DisableKeepAlives: true,
+			Dial: (&net.Dialer{
+				Timeout:   120 * time.Second,
+				KeepAlive: 120 * time.Second,
+			}).Dial,
+			TLSHandshakeTimeout:   120 * time.Second,
+			ResponseHeaderTimeout: 120 * time.Second,
+		}
+	}
+}
+
+// FIXME: Need to check for errors when reading from a file
+func WithCertPoolFile(certPath string) Option {
+	if certPath == "" {
+		return func(sc *Params) {}
+	}
+	cacert, _ := os.ReadFile(certPath)
+	certPool := x509.NewCertPool()
+	certPool.AppendCertsFromPEM(cacert)
+	return WithCertPool(certPool)
+}