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129 lines
3.2 KiB
129 lines
3.2 KiB
package rpcclient
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import (
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"encoding/json"
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"github.com/pkg/errors"
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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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func unmarshalResponseBytes(
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cdc *amino.Codec,
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responseBytes []byte,
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expectedID types.JSONRPCIntID,
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result interface{},
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) (interface{}, error) {
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// Read response. If rpc/core/types is imported, the result will unmarshal
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// into the correct type.
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response := &types.RPCResponse{}
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if err := json.Unmarshal(responseBytes, response); err != nil {
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return nil, errors.Wrap(err, "error unmarshalling")
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}
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if response.Error != nil {
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return nil, response.Error
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}
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if err := validateAndVerifyID(response, expectedID); err != nil {
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return nil, errors.Wrap(err, "wrong ID")
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}
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// Unmarshal the RawMessage into the result.
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if err := cdc.UnmarshalJSON(response.Result, result); err != nil {
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return nil, errors.Wrap(err, "error unmarshalling result")
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}
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return result, nil
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}
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func unmarshalResponseBytesArray(
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cdc *amino.Codec,
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responseBytes []byte,
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expectedIDs []types.JSONRPCIntID,
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results []interface{},
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) ([]interface{}, error) {
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var (
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responses []types.RPCResponse
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)
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if err := json.Unmarshal(responseBytes, &responses); err != nil {
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return nil, errors.Wrap(err, "error unmarshalling")
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}
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// No response error checking here as there may be a mixture of successful
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// and unsuccessful responses.
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if len(results) != len(responses) {
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return nil, errors.Errorf(
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"expected %d result objects into which to inject responses, but got %d",
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len(responses),
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len(results),
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)
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}
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// Intersect IDs from responses with expectedIDs.
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ids := make([]types.JSONRPCIntID, len(responses))
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var ok bool
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for i, resp := range responses {
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ids[i], ok = resp.ID.(types.JSONRPCIntID)
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if !ok {
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return nil, errors.Errorf("expected JSONRPCIntID, got %T", resp.ID)
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}
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}
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if err := validateResponseIDs(ids, expectedIDs); err != nil {
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return nil, errors.Wrap(err, "wrong IDs")
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}
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for i := 0; i < len(responses); i++ {
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if err := cdc.UnmarshalJSON(responses[i].Result, results[i]); err != nil {
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return nil, errors.Wrapf(err, "error unmarshalling #%d result", i)
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}
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}
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return results, nil
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}
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func validateResponseIDs(ids, expectedIDs []types.JSONRPCIntID) error {
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m := make(map[types.JSONRPCIntID]bool, len(expectedIDs))
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for _, expectedID := range expectedIDs {
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m[expectedID] = true
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}
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for i, id := range ids {
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if m[id] {
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delete(m, id)
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} else {
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return errors.Errorf("unsolicited ID #%d: %v", i, id)
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}
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}
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return nil
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}
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// From the JSON-RPC 2.0 spec:
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// id: It MUST be the same as the value of the id member in the Request Object.
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func validateAndVerifyID(res *types.RPCResponse, expectedID types.JSONRPCIntID) error {
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if err := validateResponseID(res.ID); err != nil {
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return err
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}
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if expectedID != res.ID.(types.JSONRPCIntID) { // validateResponseID ensured res.ID has the right type
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return errors.Errorf("response ID (%d) does not match request ID (%d)", res.ID, expectedID)
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}
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return nil
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}
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func validateResponseID(id interface{}) error {
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if id == nil {
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return errors.New("no ID")
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}
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_, ok := id.(types.JSONRPCIntID)
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if !ok {
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return errors.Errorf("expected JSONRPCIntID, but got: %T", id)
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}
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return nil
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}
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