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package networkdial
import (
"cmp"
"context"
"crypto/tls"
"fmt"
"net"
"net/http"
"time"
"github.com/johnandersen777/socialweb-computer-kcp/internal/kit/nettransport"
)
const (
DefaultDialTimeout = 10 * time.Second
DefaultKeepAlive = 30 * time.Second
DefaultHTTPTimeout = 30 * time.Second
DefaultIdleConnTimeout = 90 * time.Second
DefaultHandshakeTimeout = 15 * time.Second
DefaultMaxIdleConns = 100
)
type DialOptions struct {
Hosts Resolver
TLSConfig *tls.Config
AllowSystemDNS bool
}
type Dialer struct {
resolver Resolver
tlsConfig *tls.Config
dialer net.Dialer
allowSystemDNS bool
}
func NewDialer(hosts Resolver, tlsConfig *tls.Config) (*Dialer, error) {
return NewDialerWithOptions(DialOptions{Hosts: hosts, TLSConfig: tlsConfig})
}
func NewDialerWithOptions(opts DialOptions) (*Dialer, error) {
if opts.Hosts == nil {
return nil, ErrNoResolver
}
return &Dialer{
resolver: opts.Hosts,
tlsConfig: cloneTLSConfig(opts.TLSConfig),
dialer: net.Dialer{
Timeout: DefaultDialTimeout,
KeepAlive: DefaultKeepAlive,
},
allowSystemDNS: opts.AllowSystemDNS,
}, nil
}
func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
if d == nil || d.resolver == nil {
return nil, ErrNoResolver
}
target, err := d.address(address)
if err != nil {
return nil, err
}
conn, err := d.dialer.DialContext(ctx, network, target)
if err != nil {
return nil, fmt.Errorf("networkdial: dialing %s for %s: %w", target, address, err)
}
return conn, nil
}
func (d *Dialer) Resolve(address string) (string, error) {
if d == nil || d.resolver == nil {
return "", ErrNoResolver
}
return d.address(address)
}
func (d *Dialer) TLSConfig() *tls.Config {
if d == nil {
return cloneTLSConfig(nil)
}
return cloneTLSConfig(d.tlsConfig)
}
func (d *Dialer) address(address string) (string, error) {
host, _, err := net.SplitHostPort(address)
if err != nil {
return "", fmt.Errorf("networkdial: %q is not host:port: %w", address, err)
}
if mapped, ok := d.resolver.Address(address); ok {
return mapped, nil
}
if net.ParseIP(host) != nil {
return address, nil
}
if d.allowSystemDNS {
return address, nil
}
return "", fmt.Errorf("%w: %w: %s", ErrUnknownHost, ErrSystemDNSBlocked, address)
}
func NewHTTPTransport(hosts Resolver, tlsConfig *tls.Config) (*http.Transport, error) {
return NewHTTPTransportWithOptions(DialOptions{Hosts: hosts, TLSConfig: tlsConfig})
}
func NewHTTPTransportWithOptions(opts DialOptions) (*http.Transport, error) {
d, err := NewDialerWithOptions(opts)
if err != nil {
return nil, err
}
return nettransport.WithDial(&http.Transport{
TLSClientConfig: d.TLSConfig(),
ForceAttemptHTTP2: true,
MaxIdleConns: DefaultMaxIdleConns,
MaxIdleConnsPerHost: 10,
IdleConnTimeout: DefaultIdleConnTimeout,
TLSHandshakeTimeout: DefaultHandshakeTimeout,
ExpectContinueTimeout: time.Second,
}, d.DialContext), nil
}
func NewHTTPClient(hosts Resolver, tlsConfig *tls.Config) (*http.Client, error) {
return NewHTTPClientWithOptions(DialOptions{Hosts: hosts, TLSConfig: tlsConfig})
}
func NewHTTPClientWithOptions(opts DialOptions) (*http.Client, error) {
tr, err := NewHTTPTransportWithOptions(opts)
if err != nil {
return nil, err
}
return &http.Client{
Transport: tr,
Timeout: DefaultHTTPTimeout,
}, nil
}
func NewNetworkDialer(hosts Resolver, caBundlePEM []byte) (*Dialer, error) {
cfg, err := TLSConfigFromCA(caBundlePEM, "")
if err != nil {
return nil, err
}
return NewDialerWithOptions(DialOptions{Hosts: hosts, TLSConfig: cfg})
}
func NewNetworkHTTPClient(hosts Resolver, caBundlePEM []byte) (*http.Client, error) {
cfg, err := TLSConfigFromCA(caBundlePEM, "")
if err != nil {
return nil, err
}
return NewHTTPClientWithOptions(DialOptions{Hosts: hosts, TLSConfig: cfg})
}
func cloneTLSConfig(cfg *tls.Config) *tls.Config {
if cfg == nil {
return &tls.Config{MinVersion: tls.VersionTLS12}
}
out := cfg.Clone()
out.MinVersion = cmp.Or(out.MinVersion, tls.VersionTLS12)
return out
}
