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377 lines
11 KiB
377 lines
11 KiB
package rpcclient
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"strings"
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"sync"
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amino "github.com/tendermint/go-amino"
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types "github.com/tendermint/tendermint/rpc/lib/types"
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)
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const (
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protoHTTP = "http"
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protoHTTPS = "https"
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protoWSS = "wss"
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protoWS = "ws"
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protoTCP = "tcp"
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)
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//-------------------------------------------------------------
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// Parsed URL structure
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type parsedURL struct {
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url.URL
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}
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// Parse URL and set defaults
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func newParsedURL(remoteAddr string) (*parsedURL, error) {
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u, err := url.Parse(remoteAddr)
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if err != nil {
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return nil, err
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}
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// default to tcp if nothing specified
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if u.Scheme == "" {
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u.Scheme = protoTCP
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}
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return &parsedURL{*u}, nil
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}
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// Change protocol to HTTP for unknown protocols and TCP protocol - useful for RPC connections
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func (u *parsedURL) SetDefaultSchemeHTTP() {
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// protocol to use for http operations, to support both http and https
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switch u.Scheme {
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case protoHTTP, protoHTTPS, protoWS, protoWSS:
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// known protocols not changed
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default:
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// default to http for unknown protocols (ex. tcp)
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u.Scheme = protoHTTP
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}
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}
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// Get full address without the protocol - useful for Dialer connections
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func (u parsedURL) GetHostWithPath() string {
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// Remove protocol, userinfo and # fragment, assume opaque is empty
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return u.Host + u.EscapedPath()
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}
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// Get a trimmed address - useful for WS connections
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func (u parsedURL) GetTrimmedHostWithPath() string {
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// replace / with . for http requests (kvstore domain)
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return strings.Replace(u.GetHostWithPath(), "/", ".", -1)
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}
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// Get a trimmed address with protocol - useful as address in RPC connections
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func (u parsedURL) GetTrimmedURL() string {
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return u.Scheme + "://" + u.GetTrimmedHostWithPath()
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}
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//-------------------------------------------------------------
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// HTTPClient is a common interface for JSON-RPC HTTP clients.
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type HTTPClient interface {
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// Call calls the given method with the params and returns a result.
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Call(method string, params map[string]interface{}, result interface{}) (interface{}, error)
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// Codec returns an amino codec used.
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Codec() *amino.Codec
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// SetCodec sets an amino codec.
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SetCodec(*amino.Codec)
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}
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// JSONRPCCaller implementers can facilitate calling the JSON-RPC endpoint.
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type JSONRPCCaller interface {
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Call(method string, params map[string]interface{}, result interface{}) (interface{}, error)
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}
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//-------------------------------------------------------------
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// JSONRPCClient is a JSON-RPC client, which sends POST HTTP requests to the
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// remote server.
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//
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// Request values are amino encoded. Response is expected to be amino encoded.
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// New amino codec is used if no other codec was set using SetCodec.
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//
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// JSONRPCClient is safe for concurrent use by multiple goroutines.
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type JSONRPCClient struct {
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address string
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username string
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password string
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client *http.Client
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cdc *amino.Codec
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mtx sync.Mutex
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nextReqID int
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}
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var _ HTTPClient = (*JSONRPCClient)(nil)
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// Both JSONRPCClient and JSONRPCRequestBatch can facilitate calls to the JSON
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// RPC endpoint.
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var _ JSONRPCCaller = (*JSONRPCClient)(nil)
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var _ JSONRPCCaller = (*JSONRPCRequestBatch)(nil)
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// NewJSONRPCClient returns a JSONRPCClient pointed at the given address.
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// An error is returned on invalid remote. The function panics when remote is nil.
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func NewJSONRPCClient(remote string) (*JSONRPCClient, error) {
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httpClient, err := DefaultHTTPClient(remote)
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if err != nil {
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return nil, err
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}
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return NewJSONRPCClientWithHTTPClient(remote, httpClient)
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}
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// NewJSONRPCClientWithHTTPClient returns a JSONRPCClient pointed at the given
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// address using a custom http client. An error is returned on invalid remote.
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// The function panics when remote is nil.
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func NewJSONRPCClientWithHTTPClient(remote string, client *http.Client) (*JSONRPCClient, error) {
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if client == nil {
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panic("nil http.Client provided")
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}
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parsedURL, err := newParsedURL(remote)
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if err != nil {
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return nil, fmt.Errorf("invalid remote %s: %s", remote, err)
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}
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parsedURL.SetDefaultSchemeHTTP()
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address := parsedURL.GetTrimmedURL()
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username := parsedURL.User.Username()
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password, _ := parsedURL.User.Password()
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rpcClient := &JSONRPCClient{
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address: address,
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username: username,
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password: password,
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client: client,
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cdc: amino.NewCodec(),
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}
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return rpcClient, nil
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}
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// Call issues a POST HTTP request. Requests are JSON encoded. Content-Type:
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// text/json.
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func (c *JSONRPCClient) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
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id := c.nextRequestID()
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request, err := types.MapToRequest(c.cdc, id, method, params)
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if err != nil {
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return nil, fmt.Errorf("failed to encode params: %w", err)
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}
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requestBytes, err := json.Marshal(request)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal request: %w", err)
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}
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requestBuf := bytes.NewBuffer(requestBytes)
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httpRequest, err := http.NewRequest(http.MethodPost, c.address, requestBuf)
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if err != nil {
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return nil, fmt.Errorf("request failed: %w", err)
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}
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httpRequest.Header.Set("Content-Type", "text/json")
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if c.username != "" || c.password != "" {
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httpRequest.SetBasicAuth(c.username, c.password)
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}
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httpResponse, err := c.client.Do(httpRequest)
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if err != nil {
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return nil, fmt.Errorf("post failed: %w", err)
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}
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defer httpResponse.Body.Close() // nolint: errcheck
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responseBytes, err := ioutil.ReadAll(httpResponse.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read response body: %w", err)
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}
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return unmarshalResponseBytes(c.cdc, responseBytes, id, result)
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}
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func (c *JSONRPCClient) Codec() *amino.Codec { return c.cdc }
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func (c *JSONRPCClient) SetCodec(cdc *amino.Codec) { c.cdc = cdc }
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// NewRequestBatch starts a batch of requests for this client.
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func (c *JSONRPCClient) NewRequestBatch() *JSONRPCRequestBatch {
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return &JSONRPCRequestBatch{
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requests: make([]*jsonRPCBufferedRequest, 0),
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client: c,
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}
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}
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func (c *JSONRPCClient) sendBatch(requests []*jsonRPCBufferedRequest) ([]interface{}, error) {
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reqs := make([]types.RPCRequest, 0, len(requests))
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results := make([]interface{}, 0, len(requests))
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for _, req := range requests {
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reqs = append(reqs, req.request)
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results = append(results, req.result)
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}
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// serialize the array of requests into a single JSON object
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requestBytes, err := json.Marshal(reqs)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal requests: %w", err)
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}
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httpRequest, err := http.NewRequest(http.MethodPost, c.address, bytes.NewBuffer(requestBytes))
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if err != nil {
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return nil, fmt.Errorf("request failed: %w", err)
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}
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httpRequest.Header.Set("Content-Type", "text/json")
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if c.username != "" || c.password != "" {
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httpRequest.SetBasicAuth(c.username, c.password)
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}
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httpResponse, err := c.client.Do(httpRequest)
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if err != nil {
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return nil, fmt.Errorf("post failed: %w", err)
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}
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defer httpResponse.Body.Close() // nolint: errcheck
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responseBytes, err := ioutil.ReadAll(httpResponse.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read response body: %w", err)
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}
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// collect ids to check responses IDs in unmarshalResponseBytesArray
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ids := make([]types.JSONRPCIntID, len(requests))
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for i, req := range requests {
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ids[i] = req.request.ID.(types.JSONRPCIntID)
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}
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return unmarshalResponseBytesArray(c.cdc, responseBytes, ids, results)
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}
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func (c *JSONRPCClient) nextRequestID() types.JSONRPCIntID {
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c.mtx.Lock()
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id := c.nextReqID
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c.nextReqID++
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c.mtx.Unlock()
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return types.JSONRPCIntID(id)
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}
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//------------------------------------------------------------------------------------
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// jsonRPCBufferedRequest encapsulates a single buffered request, as well as its
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// anticipated response structure.
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type jsonRPCBufferedRequest struct {
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request types.RPCRequest
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result interface{} // The result will be deserialized into this object.
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}
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// JSONRPCRequestBatch allows us to buffer multiple request/response structures
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// into a single batch request. Note that this batch acts like a FIFO queue, and
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// is thread-safe.
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type JSONRPCRequestBatch struct {
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client *JSONRPCClient
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mtx sync.Mutex
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requests []*jsonRPCBufferedRequest
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}
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// Count returns the number of enqueued requests waiting to be sent.
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func (b *JSONRPCRequestBatch) Count() int {
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b.mtx.Lock()
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defer b.mtx.Unlock()
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return len(b.requests)
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}
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func (b *JSONRPCRequestBatch) enqueue(req *jsonRPCBufferedRequest) {
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b.mtx.Lock()
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defer b.mtx.Unlock()
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b.requests = append(b.requests, req)
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}
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// Clear empties out the request batch.
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func (b *JSONRPCRequestBatch) Clear() int {
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b.mtx.Lock()
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defer b.mtx.Unlock()
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return b.clear()
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}
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func (b *JSONRPCRequestBatch) clear() int {
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count := len(b.requests)
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b.requests = make([]*jsonRPCBufferedRequest, 0)
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return count
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}
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// Send will attempt to send the current batch of enqueued requests, and then
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// will clear out the requests once done. On success, this returns the
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// deserialized list of results from each of the enqueued requests.
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func (b *JSONRPCRequestBatch) Send() ([]interface{}, error) {
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b.mtx.Lock()
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defer func() {
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b.clear()
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b.mtx.Unlock()
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}()
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return b.client.sendBatch(b.requests)
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}
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// Call enqueues a request to call the given RPC method with the specified
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// parameters, in the same way that the `JSONRPCClient.Call` function would.
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func (b *JSONRPCRequestBatch) Call(
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method string,
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params map[string]interface{},
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result interface{},
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) (interface{}, error) {
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id := b.client.nextRequestID()
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request, err := types.MapToRequest(b.client.cdc, id, method, params)
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if err != nil {
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return nil, err
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}
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b.enqueue(&jsonRPCBufferedRequest{request: request, result: result})
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return result, nil
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}
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//-------------------------------------------------------------
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func makeHTTPDialer(remoteAddr string) (func(string, string) (net.Conn, error), error) {
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u, err := newParsedURL(remoteAddr)
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if err != nil {
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return nil, err
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}
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protocol := u.Scheme
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// accept http(s) as an alias for tcp
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switch protocol {
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case protoHTTP, protoHTTPS:
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protocol = protoTCP
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}
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dialFn := func(proto, addr string) (net.Conn, error) {
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return net.Dial(protocol, u.GetHostWithPath())
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}
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return dialFn, nil
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}
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// DefaultHTTPClient is used to create an http client with some default parameters.
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// We overwrite the http.Client.Dial so we can do http over tcp or unix.
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// remoteAddr should be fully featured (eg. with tcp:// or unix://).
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// An error will be returned in case of invalid remoteAddr.
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func DefaultHTTPClient(remoteAddr string) (*http.Client, error) {
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dialFn, err := makeHTTPDialer(remoteAddr)
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if err != nil {
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return nil, err
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}
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client := &http.Client{
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Transport: &http.Transport{
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// Set to true to prevent GZIP-bomb DoS attacks
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DisableCompression: true,
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Dial: dialFn,
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},
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}
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return client, nil
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}
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