You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
403 lines
11 KiB
403 lines
11 KiB
package client
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
rpctypes "github.com/tendermint/tendermint/rpc/jsonrpc/types"
|
|
)
|
|
|
|
const (
|
|
protoHTTP = "http"
|
|
protoHTTPS = "https"
|
|
protoWSS = "wss"
|
|
protoWS = "ws"
|
|
protoTCP = "tcp"
|
|
protoUNIX = "unix"
|
|
)
|
|
|
|
//-------------------------------------------------------------
|
|
|
|
// Parsed URL structure
|
|
type parsedURL struct {
|
|
url.URL
|
|
|
|
isUnixSocket bool
|
|
}
|
|
|
|
// Parse URL and set defaults
|
|
func newParsedURL(remoteAddr string) (*parsedURL, error) {
|
|
u, err := url.Parse(remoteAddr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// default to tcp if nothing specified
|
|
if u.Scheme == "" {
|
|
u.Scheme = protoTCP
|
|
}
|
|
|
|
pu := &parsedURL{
|
|
URL: *u,
|
|
isUnixSocket: false,
|
|
}
|
|
|
|
if u.Scheme == protoUNIX {
|
|
pu.isUnixSocket = true
|
|
}
|
|
|
|
return pu, nil
|
|
}
|
|
|
|
// Change protocol to HTTP for unknown protocols and TCP protocol - useful for RPC connections
|
|
func (u *parsedURL) SetDefaultSchemeHTTP() {
|
|
// protocol to use for http operations, to support both http and https
|
|
switch u.Scheme {
|
|
case protoHTTP, protoHTTPS, protoWS, protoWSS:
|
|
// known protocols not changed
|
|
default:
|
|
// default to http for unknown protocols (ex. tcp)
|
|
u.Scheme = protoHTTP
|
|
}
|
|
}
|
|
|
|
// Get full address without the protocol - useful for Dialer connections
|
|
func (u parsedURL) GetHostWithPath() string {
|
|
// Remove protocol, userinfo and # fragment, assume opaque is empty
|
|
return u.Host + u.EscapedPath()
|
|
}
|
|
|
|
// Get a trimmed address - useful for WS connections
|
|
func (u parsedURL) GetTrimmedHostWithPath() string {
|
|
// if it's not an unix socket we return the normal URL
|
|
if !u.isUnixSocket {
|
|
return u.GetHostWithPath()
|
|
}
|
|
// if it's a unix socket we replace the host slashes with a period
|
|
// this is because otherwise the http.Client would think that the
|
|
// domain is invalid.
|
|
return strings.ReplaceAll(u.GetHostWithPath(), "/", ".")
|
|
}
|
|
|
|
// GetDialAddress returns the endpoint to dial for the parsed URL
|
|
func (u parsedURL) GetDialAddress() string {
|
|
// if it's not a unix socket we return the host, example: localhost:443
|
|
if !u.isUnixSocket {
|
|
return u.Host
|
|
}
|
|
// otherwise we return the path of the unix socket, ex /tmp/socket
|
|
return u.GetHostWithPath()
|
|
}
|
|
|
|
// Get a trimmed address with protocol - useful as address in RPC connections
|
|
func (u parsedURL) GetTrimmedURL() string {
|
|
return u.Scheme + "://" + u.GetTrimmedHostWithPath()
|
|
}
|
|
|
|
//-------------------------------------------------------------
|
|
|
|
// A Caller handles the round trip of a single JSON-RPC request. The
|
|
// implementation is responsible for assigning request IDs, marshaling
|
|
// parameters, and unmarshaling results.
|
|
type Caller interface {
|
|
// Call sends a new request for method to the server with the given
|
|
// parameters. If params == nil, the request has empty parameters.
|
|
// If result == nil, any result value must be discarded without error.
|
|
// Otherwise the concrete value of result must be a pointer.
|
|
Call(ctx context.Context, method string, params, result interface{}) error
|
|
}
|
|
|
|
//-------------------------------------------------------------
|
|
|
|
// Client is a JSON-RPC client, which sends POST HTTP requests to the
|
|
// remote server.
|
|
//
|
|
// Client is safe for concurrent use by multiple goroutines.
|
|
type Client struct {
|
|
address string
|
|
username string
|
|
password string
|
|
|
|
client *http.Client
|
|
|
|
mtx sync.Mutex
|
|
nextReqID int
|
|
}
|
|
|
|
// Both Client and RequestBatch can facilitate calls to the JSON
|
|
// RPC endpoint.
|
|
var _ Caller = (*Client)(nil)
|
|
var _ Caller = (*RequestBatch)(nil)
|
|
|
|
// New returns a Client pointed at the given address.
|
|
// An error is returned on invalid remote. The function panics when remote is nil.
|
|
func New(remote string) (*Client, error) {
|
|
httpClient, err := DefaultHTTPClient(remote)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return NewWithHTTPClient(remote, httpClient)
|
|
}
|
|
|
|
// NewWithHTTPClient returns a Client pointed at the given address using a
|
|
// custom http client. An error is returned on invalid remote. The function
|
|
// panics when client is nil.
|
|
func NewWithHTTPClient(remote string, c *http.Client) (*Client, error) {
|
|
if c == nil {
|
|
return nil, errors.New("nil client")
|
|
}
|
|
|
|
parsedURL, err := newParsedURL(remote)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("invalid remote %s: %s", remote, err)
|
|
}
|
|
|
|
parsedURL.SetDefaultSchemeHTTP()
|
|
|
|
address := parsedURL.GetTrimmedURL()
|
|
username := parsedURL.User.Username()
|
|
password, _ := parsedURL.User.Password()
|
|
|
|
rpcClient := &Client{
|
|
address: address,
|
|
username: username,
|
|
password: password,
|
|
client: c,
|
|
}
|
|
|
|
return rpcClient, nil
|
|
}
|
|
|
|
// Call issues a POST HTTP request. Requests are JSON encoded. Content-Type:
|
|
// application/json.
|
|
func (c *Client) Call(ctx context.Context, method string, params, result interface{}) error {
|
|
id := c.nextRequestID()
|
|
|
|
request, err := rpctypes.ParamsToRequest(id, method, params)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to encode params: %w", err)
|
|
}
|
|
|
|
requestBytes, err := json.Marshal(request)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to marshal request: %w", err)
|
|
}
|
|
|
|
requestBuf := bytes.NewBuffer(requestBytes)
|
|
httpRequest, err := http.NewRequestWithContext(ctx, http.MethodPost, c.address, requestBuf)
|
|
if err != nil {
|
|
return fmt.Errorf("request setup failed: %w", err)
|
|
}
|
|
|
|
httpRequest.Header.Set("Content-Type", "application/json")
|
|
|
|
if c.username != "" || c.password != "" {
|
|
httpRequest.SetBasicAuth(c.username, c.password)
|
|
}
|
|
|
|
httpResponse, err := c.client.Do(httpRequest)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
defer httpResponse.Body.Close()
|
|
|
|
responseBytes, err := io.ReadAll(httpResponse.Body)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to read response body: %w", err)
|
|
}
|
|
|
|
return unmarshalResponseBytes(responseBytes, id, result)
|
|
}
|
|
|
|
// NewRequestBatch starts a batch of requests for this client.
|
|
func (c *Client) NewRequestBatch() *RequestBatch {
|
|
return &RequestBatch{
|
|
requests: make([]*jsonRPCBufferedRequest, 0),
|
|
client: c,
|
|
}
|
|
}
|
|
|
|
func (c *Client) sendBatch(ctx context.Context, requests []*jsonRPCBufferedRequest) ([]interface{}, error) {
|
|
reqs := make([]rpctypes.RPCRequest, 0, len(requests))
|
|
results := make([]interface{}, 0, len(requests))
|
|
for _, req := range requests {
|
|
reqs = append(reqs, req.request)
|
|
results = append(results, req.result)
|
|
}
|
|
|
|
// serialize the array of requests into a single JSON object
|
|
requestBytes, err := json.Marshal(reqs)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("json marshal: %w", err)
|
|
}
|
|
|
|
httpRequest, err := http.NewRequestWithContext(ctx, http.MethodPost, c.address, bytes.NewBuffer(requestBytes))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("new request: %w", err)
|
|
}
|
|
|
|
httpRequest.Header.Set("Content-Type", "application/json")
|
|
|
|
if c.username != "" || c.password != "" {
|
|
httpRequest.SetBasicAuth(c.username, c.password)
|
|
}
|
|
|
|
httpResponse, err := c.client.Do(httpRequest)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("post: %w", err)
|
|
}
|
|
|
|
defer httpResponse.Body.Close()
|
|
|
|
responseBytes, err := io.ReadAll(httpResponse.Body)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("read response body: %w", err)
|
|
}
|
|
|
|
// collect ids to check responses IDs in unmarshalResponseBytesArray
|
|
ids := make([]rpctypes.JSONRPCIntID, len(requests))
|
|
for i, req := range requests {
|
|
ids[i] = req.request.ID.(rpctypes.JSONRPCIntID)
|
|
}
|
|
|
|
return unmarshalResponseBytesArray(responseBytes, ids, results)
|
|
}
|
|
|
|
func (c *Client) nextRequestID() rpctypes.JSONRPCIntID {
|
|
c.mtx.Lock()
|
|
id := c.nextReqID
|
|
c.nextReqID++
|
|
c.mtx.Unlock()
|
|
return rpctypes.JSONRPCIntID(id)
|
|
}
|
|
|
|
//------------------------------------------------------------------------------------
|
|
|
|
// jsonRPCBufferedRequest encapsulates a single buffered request, as well as its
|
|
// anticipated response structure.
|
|
type jsonRPCBufferedRequest struct {
|
|
request rpctypes.RPCRequest
|
|
result interface{} // The result will be deserialized into this object.
|
|
}
|
|
|
|
// RequestBatch allows us to buffer multiple request/response structures
|
|
// into a single batch request. Note that this batch acts like a FIFO queue, and
|
|
// is thread-safe.
|
|
type RequestBatch struct {
|
|
client *Client
|
|
|
|
mtx sync.Mutex
|
|
requests []*jsonRPCBufferedRequest
|
|
}
|
|
|
|
// Count returns the number of enqueued requests waiting to be sent.
|
|
func (b *RequestBatch) Count() int {
|
|
b.mtx.Lock()
|
|
defer b.mtx.Unlock()
|
|
return len(b.requests)
|
|
}
|
|
|
|
func (b *RequestBatch) enqueue(req *jsonRPCBufferedRequest) {
|
|
b.mtx.Lock()
|
|
defer b.mtx.Unlock()
|
|
b.requests = append(b.requests, req)
|
|
}
|
|
|
|
// Clear empties out the request batch.
|
|
func (b *RequestBatch) Clear() int {
|
|
b.mtx.Lock()
|
|
defer b.mtx.Unlock()
|
|
return b.clear()
|
|
}
|
|
|
|
func (b *RequestBatch) clear() int {
|
|
count := len(b.requests)
|
|
b.requests = make([]*jsonRPCBufferedRequest, 0)
|
|
return count
|
|
}
|
|
|
|
// Send will attempt to send the current batch of enqueued requests, and then
|
|
// will clear out the requests once done. On success, this returns the
|
|
// deserialized list of results from each of the enqueued requests.
|
|
func (b *RequestBatch) Send(ctx context.Context) ([]interface{}, error) {
|
|
b.mtx.Lock()
|
|
defer func() {
|
|
b.clear()
|
|
b.mtx.Unlock()
|
|
}()
|
|
return b.client.sendBatch(ctx, b.requests)
|
|
}
|
|
|
|
// Call enqueues a request to call the given RPC method with the specified
|
|
// parameters, in the same way that the `Client.Call` function would.
|
|
func (b *RequestBatch) Call(_ context.Context, method string, params, result interface{}) error {
|
|
id := b.client.nextRequestID()
|
|
request, err := rpctypes.ParamsToRequest(id, method, params)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b.enqueue(&jsonRPCBufferedRequest{request: request, result: result})
|
|
return nil
|
|
}
|
|
|
|
//-------------------------------------------------------------
|
|
|
|
func makeHTTPDialer(remoteAddr string) (func(string, string) (net.Conn, error), error) {
|
|
u, err := newParsedURL(remoteAddr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
protocol := u.Scheme
|
|
padding := u.Scheme
|
|
|
|
// accept http(s) as an alias for tcp
|
|
switch protocol {
|
|
case protoHTTP, protoHTTPS:
|
|
protocol = protoTCP
|
|
}
|
|
|
|
dialFn := func(proto, addr string) (net.Conn, error) {
|
|
var timeout = 10 * time.Second
|
|
if !u.isUnixSocket && strings.LastIndex(u.Host, ":") == -1 {
|
|
u.Host = fmt.Sprintf("%s:%s", u.Host, padding)
|
|
return net.DialTimeout(protocol, u.GetDialAddress(), timeout)
|
|
}
|
|
|
|
return net.DialTimeout(protocol, u.GetDialAddress(), timeout)
|
|
}
|
|
|
|
return dialFn, nil
|
|
}
|
|
|
|
// DefaultHTTPClient is used to create an http client with some default parameters.
|
|
// We overwrite the http.Client.Dial so we can do http over tcp or unix.
|
|
// remoteAddr should be fully featured (eg. with tcp:// or unix://).
|
|
// An error will be returned in case of invalid remoteAddr.
|
|
func DefaultHTTPClient(remoteAddr string) (*http.Client, error) {
|
|
dialFn, err := makeHTTPDialer(remoteAddr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
client := &http.Client{
|
|
Transport: &http.Transport{
|
|
// Set to true to prevent GZIP-bomb DoS attacks
|
|
DisableCompression: true,
|
|
Dial: dialFn,
|
|
},
|
|
}
|
|
|
|
return client, nil
|
|
}
|