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transport.go
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transport.go
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package transport
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"net"
"net/http"
"net/url"
"time"
"github.com/pkg/errors"
"github.com/why444216978/go-util/assert"
client "github.com/air-go/rpc/client/http"
"github.com/air-go/rpc/library/logger"
"github.com/air-go/rpc/library/servicer"
timeoutLib "github.com/air-go/rpc/server/http/middleware/timeout"
)
type RPC struct {
logger logger.Logger
beforePlugins []client.BeforeRequestPlugin
afterPlugins []client.AfterRequestPlugin
}
var _ client.Client = (*RPC)(nil)
type Option func(r *RPC)
func WithLogger(logger logger.Logger) Option {
return func(r *RPC) { r.logger = logger }
}
func WithBeforePlugins(plugins ...client.BeforeRequestPlugin) Option {
return func(r *RPC) { r.beforePlugins = plugins }
}
func WithAfterPlugins(plugins ...client.AfterRequestPlugin) Option {
return func(r *RPC) { r.afterPlugins = plugins }
}
func New(opts ...Option) *RPC {
r := &RPC{}
for _, o := range opts {
o(r)
}
return r
}
func (r *RPC) Send(ctx context.Context, request client.Request, response *client.Response) (err error) {
if err = r.beforeCheck(ctx, request, response); err != nil {
return
}
serviceName := request.GetServiceName()
// get servicer
service, ok := servicer.GetServicer(serviceName)
if !ok {
err = errors.Errorf("get [%s] servicer is nil", serviceName)
return
}
// construct client
cli, node, err := r.getClient(ctx, serviceName, service)
if err != nil {
return
}
if assert.IsNil(node) {
err = errors.New("node nil")
return
}
// build url
uu, err := r.buildURL(request, node)
if err != nil {
return
}
uri := fmt.Sprintf("%s?%s", uu.Path, uu.RawQuery)
// build http request
req, err := r.buildRequest(ctx, request, uu)
if err != nil {
return
}
// timeout deliver
if err = timeoutLib.SetHeader(ctx, req.Header); err != nil {
return
}
ret, err := r.send(ctx, cli, service, node, req, response)
if r.logger == nil {
return
}
fields := []logger.Field{
logger.Reflect(logger.ServiceName, serviceName),
logger.Reflect(logger.Header, request.GetHeader()),
logger.Reflect(logger.Method, request.GetMethod()),
logger.Reflect(logger.API, request.GetPath()),
logger.Reflect(logger.URI, uri),
logger.Reflect(logger.Request, request.GetBody()),
logger.Reflect(logger.Response, response.Body),
logger.Reflect(logger.ServerIP, node.Host()),
logger.Reflect(logger.ServerPort, node.Port()),
logger.Reflect(logger.Code, response.HTTPCode),
logger.Reflect(logger.Cost, ret.requestCost+ret.decodeCost),
}
if err != nil {
r.logger.Error(ctx, err.Error(), fields...)
return
}
r.logger.Info(ctx, "rpc success", fields...)
return
}
func (r *RPC) beforeCheck(ctx context.Context, request client.Request, response *client.Response) error {
if assert.IsNil(request) {
return errors.New("request is nil")
}
if assert.IsNil(request.GetCodec()) {
return errors.New("request codec is nil")
}
if assert.IsNil(response) {
return errors.New("response is nil")
}
if assert.IsNil(response.Codec) {
return errors.New("response codec is nil")
}
return nil
}
func (r *RPC) buildURL(request client.Request, node servicer.Node) (u *url.URL, err error) {
u = &url.URL{
Scheme: "http",
Host: fmt.Sprintf("%s:%d", node.Host(), node.Port()),
Path: request.GetPath(),
RawQuery: request.GetQuery().Encode(),
}
return
}
func (r *RPC) buildRequest(ctx context.Context, request client.Request, uu *url.URL) (req *http.Request, err error) {
encode := request.GetCodec()
if assert.IsNil(encode) {
err = errors.New("request.Codec is nil")
return
}
if assert.IsNil(request.GetHeader()) {
request.SetHeader(http.Header{})
}
var body io.Reader
switch r := request.(type) {
case *client.DefaultRequest:
if body, err = encode.Encode(r.GetBody()); err != nil {
return
}
case *client.MultiRequest:
if body, err = encode.Encode(nil); err != nil {
return
}
default:
err = errors.New("build Request type err")
return
}
if req, err = http.NewRequestWithContext(ctx, request.GetMethod(), uu.String(), body); err != nil {
return
}
// multi encode will set header
// so set http.Request header must after encode
req.Header = request.GetHeader()
return
}
type sendRet struct {
requestCost int64
decodeCost int64
}
func (r *RPC) send(ctx context.Context, cli *http.Client, service servicer.Servicer, node servicer.Node,
req *http.Request, response *client.Response,
) (ret sendRet, err error) {
// check context cancel
if err = ctx.Err(); err != nil {
return
}
// before plugins
for _, plugin := range r.beforePlugins {
ctx, _ = plugin.Handle(ctx, req)
}
// send request
start := time.Now()
resp, err := cli.Do(req)
ret.requestCost = time.Since(start).Milliseconds()
_ = service.Done(ctx, node, err)
// after plugins
for _, plugin := range r.afterPlugins {
ctx, _ = plugin.Handle(ctx, req, resp)
}
if err != nil {
return
}
defer resp.Body.Close()
response.HTTPCode = resp.StatusCode
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf("http code is %d", resp.StatusCode)
return
}
// decode response body
start = time.Now()
err = response.Codec.Decode(resp.Body, response.Body)
ret.decodeCost = time.Since(start).Milliseconds()
return
}
func (r *RPC) getClient(ctx context.Context, serviceName string, service servicer.Servicer) (client *http.Client, node servicer.Node, err error) {
node, err = service.Pick(ctx)
if err != nil {
return
}
address := node.Address()
tp := &http.Transport{
MaxIdleConnsPerHost: 30,
MaxConnsPerHost: 30,
IdleConnTimeout: time.Minute,
DialContext: func(ctx context.Context, network, _ string) (net.Conn, error) {
conn, err := (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 60 * time.Second,
}).DialContext(ctx, "tcp", address)
if err != nil {
return nil, err
}
return conn, nil
},
DialTLSContext: func(ctx context.Context, network, _ string) (net.Conn, error) {
pool := x509.NewCertPool()
pool.AppendCertsFromPEM(service.GetCaCrt())
cliCrt, err := tls.X509KeyPair(service.GetClientPem(), service.GetClientKey())
if err != nil {
err = errors.New("server pem error " + err.Error())
return nil, err
}
conn, err := (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 60 * time.Second,
}).DialContext(ctx, "tcp", address)
if err != nil {
return nil, err
}
return tls.Client(conn, &tls.Config{
RootCAs: pool,
Certificates: []tls.Certificate{cliCrt},
ServerName: serviceName,
}), err
},
}
client = &http.Client{Transport: tp}
return
}