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json_rpc.go
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json_rpc.go
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package zhttp
import (
"bufio"
"crypto/tls"
"errors"
"io"
"net"
"net/http"
"net/rpc"
"net/rpc/jsonrpc"
"strconv"
"strings"
"time"
"github.com/sohaha/zlsgo/zstring"
"github.com/sohaha/zlsgo/zvalid"
)
type JSONRPC struct {
client *rpc.Client
path string
address string
options JSONRPCOptions
}
func (j *JSONRPC) Call(serviceMethod string, args interface{}, reply interface{}) error {
r := <-j.Go(serviceMethod, args, reply, make(chan *rpc.Call, 1)).Done
return r.Error
}
func (j *JSONRPC) Go(serviceMethod string, args interface{}, reply interface{}, done chan *rpc.Call) *rpc.Call {
r := j.client.Go(serviceMethod, args, reply, done)
if r.Error != nil && r.Error == rpc.ErrShutdown && j.options.Retry {
if j.options.RetryDelay > 0 {
time.Sleep(j.options.RetryDelay)
}
err := j.connect()
if err == nil {
done = make(chan *rpc.Call, 1)
return j.Go(serviceMethod, args, reply, done)
}
}
return r
}
func (j *JSONRPC) Close() error {
err := j.client.Close()
return err
}
func (j *JSONRPC) connect() error {
var conn net.Conn
var err error
d := net.Dialer{}
if j.options.Timeout > 0 {
d.Timeout = j.options.Timeout
}
if j.options.TlsConfig == nil {
conn, err = d.Dial("tcp", j.address)
} else {
config := j.options.TlsConfig
if config.RootCAs == nil {
config.InsecureSkipVerify = true
}
conn, err = tls.DialWithDialer(&d, "tcp", j.address, config)
}
if err != nil {
return err
}
message := zstring.Buffer(2)
_, _ = message.WriteString("CONNECT " + j.path + " HTTP/1.0\n")
for k := range j.options.Header {
_, _ = message.WriteString(k)
_, _ = message.WriteString(": ")
_, _ = message.WriteString(j.options.Header.Get(k))
_, _ = message.WriteString("\n")
}
_, _ = message.WriteString("\n\n")
_, _ = io.WriteString(conn, message.String())
response, err := http.ReadResponse(bufio.NewReader(conn), &http.Request{Method: "CONNECT"})
if err != nil {
return err
}
if response.StatusCode != http.StatusOK && response.ContentLength != -1 {
return errors.New("Prohibit connection, a status code: " + strconv.Itoa(response.StatusCode))
}
j.client = rpc.NewClientWithCodec(jsonrpc.NewClientCodec(conn))
return nil
}
type JSONRPCOptions struct {
TlsConfig *tls.Config
Header http.Header
Timeout time.Duration
RetryDelay time.Duration
Retry bool
}
func NewJSONRPC(address string, path string, opts ...func(o *JSONRPCOptions)) (client *JSONRPC, err error) {
o := JSONRPCOptions{
Retry: true,
RetryDelay: time.Second * 1,
Header: http.Header{},
}
if len(opts) > 0 {
opts[0](&o)
}
if !strings.ContainsRune(address, ':') {
address = ":" + address
}
if zvalid.Text(address).IsURL().Ok() {
s := strings.Split(address, "://")
if len(s) > 1 {
address = s[1]
if s[0] == "https" {
o.TlsConfig = &tls.Config{}
}
}
}
client = &JSONRPC{options: o, address: address, path: path}
err = client.connect()
return
}