github.com/fibonacci-chain/fbc@v0.0.0-20231124064014-c7636198c1e9/libs/cosmos-sdk/x/params/proposal_handler.go (about)

     1  package params
     2  
     3  import (
     4  	"fmt"
     5  
     6  	sdk "github.com/fibonacci-chain/fbc/libs/cosmos-sdk/types"
     7  	sdkerrors "github.com/fibonacci-chain/fbc/libs/cosmos-sdk/types/errors"
     8  	govtypes "github.com/fibonacci-chain/fbc/libs/cosmos-sdk/x/gov/types"
     9  )
    10  
    11  // NewParamChangeProposalHandler creates a new governance Handler for a ParamChangeProposal
    12  func NewParamChangeProposalHandler(k Keeper) govtypes.Handler {
    13  	return func(ctx sdk.Context, content govtypes.Content) error {
    14  		switch c := content.(type) {
    15  		case ParameterChangeProposal:
    16  			return handleParameterChangeProposal(ctx, k, c)
    17  
    18  		default:
    19  			return sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unrecognized param proposal content type: %T", c)
    20  		}
    21  	}
    22  }
    23  
    24  func handleParameterChangeProposal(ctx sdk.Context, k Keeper, p ParameterChangeProposal) error {
    25  	for _, c := range p.Changes {
    26  		ss, ok := k.GetSubspace(c.Subspace)
    27  		if !ok {
    28  			return sdkerrors.Wrap(ErrUnknownSubspace, c.Subspace)
    29  		}
    30  
    31  		k.Logger(ctx).Info(
    32  			fmt.Sprintf("attempt to set new parameter value; key: %s, value: %s", c.Key, c.Value),
    33  		)
    34  
    35  		if err := ss.Update(ctx, []byte(c.Key), []byte(c.Value)); err != nil {
    36  			return sdkerrors.Wrapf(ErrSettingParameter, "key: %s, value: %s, err: %s", c.Key, c.Value, err.Error())
    37  		}
    38  	}
    39  
    40  	return nil
    41  }