// sendCmd sends the passed command to the associated server and returns a
// response channel on which the reply will be delivered at some point in the
// future. It handles both websocket and HTTP POST mode depending on the
// configuration of the client.
func (c *Client) sendCmd(cmd interface{}) chan *response {
// Get the method associated with the command.
method, err := dcrjson.CmdMethod(cmd)
if err != nil {
return newFutureError(err)
}
// Marshal the command.
id := c.NextID()
marshalledJSON, err := dcrjson.MarshalCmd(id, cmd)
if err != nil {
return newFutureError(err)
}
// Generate the request and send it along with a channel to respond on.
responseChan := make(chan *response, 1)
jReq := &jsonRequest{
id: id,
method: method,
cmd: cmd,
marshalledJSON: marshalledJSON,
responseChan: responseChan,
}
c.sendRequest(jReq)
return responseChan
}
// TestCmdMethod tests the CmdMethod function to ensure it returns the expected
// methods and errors.
func TestCmdMethod(t *testing.T) {
t.Parallel()
tests := []struct {
name string
cmd interface{}
method string
err error
}{
{
name: "unregistered type",
cmd: (*int)(nil),
err: dcrjson.Error{Code: dcrjson.ErrUnregisteredMethod},
},
{
name: "nil pointer of registered type",
cmd: (*dcrjson.GetBlockCmd)(nil),
method: "getblock",
},
{
name: "nil instance of registered type",
cmd: &dcrjson.GetBlockCountCmd{},
method: "getblockcount",
},
}
t.Logf("Running %d tests", len(tests))
for i, test := range tests {
method, err := dcrjson.CmdMethod(test.cmd)
if reflect.TypeOf(err) != reflect.TypeOf(test.err) {
t.Errorf("Test #%d (%s) wrong error - got %T (%[3]v), "+
"want %T", i, test.name, err, test.err)
continue
}
if err != nil {
gotErrorCode := err.(dcrjson.Error).Code
if gotErrorCode != test.err.(dcrjson.Error).Code {
t.Errorf("Test #%d (%s) mismatched error code "+
"- got %v (%v), want %v", i, test.name,
gotErrorCode, err,
test.err.(dcrjson.Error).Code)
continue
}
continue
}
// Ensure method matches the expected value.
if method != test.method {
t.Errorf("Test #%d (%s) mismatched method - got %v, "+
"want %v", i, test.name, method, test.method)
continue
}
}
}