init corrosion API client

internal/corrosion/client.go

@@ -0,0 +1,64 @@
+package corrosion
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"golang.org/x/net/http2"
+	"net"
+	"net/http"
+	"net/netip"
+	"net/url"
+	"time"
+)
+
+const (
+	// HTTP2ConnectTimeout is the maximum amount of time a client will wait for a connection to be established.
+	http2ConnectTimeout = 3 * time.Second
+	// HTTP2Timeout is the maximum amount of time a client will wait for a response.
+	http2Timeout = 30 * time.Second
+)
+
+type APIClient struct {
+	baseURL *url.URL
+	client  *http.Client
+}
+
+type ExecResponse struct {
+	Results []ExecResult `json:"results"`
+	Time    float64      `json:"time"`
+	Version *uint64      `json:"version"`
+}
+
+type ExecResult struct {
+	RowsAffected *uint    `json:"rows_affected"`
+	Time         *float64 `json:"time"`
+	Error        *string  `json:"error"`
+}
+
+type statement struct {
+	Query  string `json:"query"`
+	Params []any  `json:"params"`
+}
+
+func NewAPIClient(addr netip.AddrPort) (*APIClient, error) {
+	baseURL, err := url.Parse(fmt.Sprintf("http://%s", addr))
+	if err != nil {
+		return nil, fmt.Errorf("invalid URL: %w", err)
+	}
+	return &APIClient{
+		baseURL: baseURL,
+		client: &http.Client{
+			Timeout: http2Timeout,
+			Transport: &http2.Transport{
+				AllowHTTP: true,
+				DialTLSContext: func(ctx context.Context, network, addr string, _ *tls.Config) (net.Conn, error) {
+					dialer := &net.Dialer{
+						Timeout: http2ConnectTimeout,
+					}
+					return dialer.DialContext(ctx, network, addr)
+				},
+			},
+		},
+	}, nil
+}