mesg-foundation/core

package process

import (
    sdk "github.com/cosmos/cosmos-sdk/types"
    sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
    "github.com/mesg-foundation/engine/x/process/internal/types"
)

// NewHandler creates an sdk.Handler for all the process type messages
func NewHandler(k Keeper) sdk.Handler {
    return func(ctx sdk.Context, msg sdk.Msg) (*sdk.Result, error) {
        ctx = ctx.WithEventManager(sdk.NewEventManager())
        switch msg := msg.(type) {
        case MsgCreate:
            return handleMsgCreate(ctx, k, &msg)
        case MsgDelete:
            return handleMsgDelete(ctx, k, &msg)
        default:
            return nil, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unrecognized %s message type: %T", types.ModuleName, msg)
        }
    }
}

// handleMsgCreate creates a new process.
func handleMsgCreate(ctx sdk.Context, k Keeper, msg *MsgCreate) (*sdk.Result, error) {
    p, err := k.Create(ctx, msg)
    if err != nil {
        return nil, err
    }

    ctx.EventManager().EmitEvent(
        sdk.NewEvent(
            sdk.EventTypeMessage,
            sdk.NewAttribute(sdk.AttributeKeyModule, ModuleName),
            sdk.NewAttribute(sdk.AttributeKeySender, msg.Owner.String()),
        ),
    )

    return &sdk.Result{
        Data:   p.Hash,
        Events: ctx.EventManager().Events(),
    }, nil
}

// handleMsgDelete deletes a process.
func handleMsgDelete(ctx sdk.Context, k Keeper, msg *MsgDelete) (*sdk.Result, error) {
    if err := k.Delete(ctx, msg); err != nil {
        return nil, err
    }

    ctx.EventManager().EmitEvent(
        sdk.NewEvent(
            sdk.EventTypeMessage,
            sdk.NewAttribute(sdk.AttributeKeyModule, ModuleName),
            sdk.NewAttribute(sdk.AttributeKeySender, msg.Owner.String()),
        ),
    )

    return &sdk.Result{Events: ctx.EventManager().Events()}, nil
}