b2a5e34aac
* Started RPC package to allow querying balances and sending raw transactions for sc's * integrate invoke cmd in cli * bumped version * added sendrawtransaction to the rpc client.
123 lines
2.6 KiB
Go
123 lines
2.6 KiB
Go
package rpc
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"time"
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)
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var (
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defaultDialTimeout = 4 * time.Second
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defaultRequestTimeout = 4 * time.Second
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defaultClientVersion = "2.0"
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)
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// Client represents the middleman for executing JSON RPC calls
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// to remote NEO RPC nodes.
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type Client struct {
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// The underlying http client. It's never a good practice to use
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// the http.DefaultClient, therefore we will role our own.
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http.Client
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endpoint *url.URL
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ctx context.Context
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version string
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}
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// ClientOptions defines options for the RPC client.
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// All Values are optional. If any duration is not specified
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// a default of 3 seconds will be used.
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type ClientOptions struct {
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Cert string
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Key string
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CACert string
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DialTimeout time.Duration
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RequestTimeout time.Duration
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// Version is the version of the client that will be send
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// along with the request body. If no version is specified
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// the default version (currently 2.0) will be used.
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Version string
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}
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// NewClient return a new Client ready to use.
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func NewClient(ctx context.Context, endpoint string, opts ClientOptions) (*Client, error) {
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url, err := url.Parse(endpoint)
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if err != nil {
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return nil, err
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}
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if opts.DialTimeout == 0 {
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opts.DialTimeout = defaultDialTimeout
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}
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if opts.RequestTimeout == 0 {
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opts.RequestTimeout = defaultRequestTimeout
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}
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if opts.Version == "" {
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opts.Version = defaultClientVersion
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}
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transport := &http.Transport{
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Dial: (&net.Dialer{
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Timeout: opts.DialTimeout,
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}).Dial,
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}
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// TODO(@antdm): Enable SSL.
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if opts.Cert != "" && opts.Key != "" {
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}
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return &Client{
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Client: http.Client{
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Timeout: opts.RequestTimeout,
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Transport: transport,
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},
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endpoint: url,
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ctx: ctx,
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version: opts.Version,
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}, nil
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}
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func (c *Client) performRequest(method string, p params, v interface{}) error {
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r := request{
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JSONRPC: c.version,
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Method: method,
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Params: p.values,
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ID: 1,
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}
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b, err := json.Marshal(r)
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if err != nil {
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return err
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}
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req, err := http.NewRequest("POST", c.endpoint.String(), bytes.NewReader(b))
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if err != nil {
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return err
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}
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resp, err := c.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("Remote responded with a non 200 response: %d", resp.StatusCode)
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}
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return json.NewDecoder(resp.Body).Decode(v)
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}
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// Ping attempts to create a connection to the endpoint.
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// and returns an error if there is one.
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func (c *Client) Ping() error {
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conn, err := net.DialTimeout("tcp", c.endpoint.Host, defaultDialTimeout)
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if err != nil {
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return err
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}
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_ = conn.Close()
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return nil
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}
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