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