mesg-foundation/core

package keeper

import (
    "fmt"

    "github.com/cosmos/cosmos-sdk/codec"
    sdk "github.com/cosmos/cosmos-sdk/types"
    sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
    "github.com/mesg-foundation/engine/hash"
    ownershippb "github.com/mesg-foundation/engine/ownership"
    servicepb "github.com/mesg-foundation/engine/service"
    "github.com/mesg-foundation/engine/x/service/internal/types"
    "github.com/tendermint/tendermint/libs/log"
)

// Keeper of the service store
type Keeper struct {
    storeKey        sdk.StoreKey
    cdc             *codec.Codec
    ownershipKeeper types.OwnershipKeeper
}

// NewKeeper creates a service keeper
func NewKeeper(cdc *codec.Codec, key sdk.StoreKey, ownershipKeeper types.OwnershipKeeper) Keeper {
    keeper := Keeper{
        storeKey:        key,
        cdc:             cdc,
        ownershipKeeper: ownershipKeeper,
    }
    return keeper
}

// Logger returns a module-specific logger.
func (k Keeper) Logger(ctx sdk.Context) log.Logger {
    return ctx.Logger().With("module", fmt.Sprintf("x/%s", types.ModuleName))
}

// Create creates a new service.
func (k Keeper) Create(ctx sdk.Context, msg *types.MsgCreate) (*servicepb.Service, error) {
    store := ctx.KVStore(k.storeKey)
    // create service
    srv, err := servicepb.New(
        msg.Sid,
        msg.Name,
        msg.Description,
        msg.Configuration,
        msg.Tasks,
        msg.Events,
        msg.Dependencies,
        msg.Repository,
        msg.Source,
    )
    if err != nil {
        return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, err.Error())
    }

    // check if service already exists.
    if store.Has(srv.Hash) {
        return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "service %q already exists", srv.Hash)
    }

    if _, err := k.ownershipKeeper.Set(ctx, msg.Owner, srv.Hash, ownershippb.Ownership_Service, srv.Address); err != nil {
        return nil, err
    }

    value, err := k.cdc.MarshalBinaryLengthPrefixed(srv)
    if err != nil {
        return nil, sdkerrors.Wrapf(sdkerrors.ErrJSONMarshal, err.Error())
    }
    store.Set(srv.Hash, value)

    // emit event
    ctx.EventManager().EmitEvent(
        sdk.NewEvent(
            types.EventType,
            sdk.NewAttribute(sdk.AttributeKeyAction, types.AttributeActionCreated),
            sdk.NewAttribute(types.AttributeKeyHash, srv.Hash.String()),
            sdk.NewAttribute(types.AttributeKeyAddress, srv.Address.String()),
        ),
    )

    return srv, nil
}

// Get returns the service that matches given hash.
func (k Keeper) Get(ctx sdk.Context, hash hash.Hash) (*servicepb.Service, error) {
    store := ctx.KVStore(k.storeKey)
    if !store.Has(hash) {
        return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "service %q not found", hash)
    }
    var sv *servicepb.Service
    if err := k.cdc.UnmarshalBinaryLengthPrefixed(store.Get(hash), &sv); err != nil {
        return nil, sdkerrors.Wrap(sdkerrors.ErrJSONUnmarshal, err.Error())
    }
    return sv, nil
}

// Exists returns true if a specific set of data exists in the database, false otherwise
func (k Keeper) Exists(ctx sdk.Context, hash hash.Hash) (bool, error) {
    return ctx.KVStore(k.storeKey).Has(hash), nil
}

// List returns all services.
func (k Keeper) List(ctx sdk.Context) ([]*servicepb.Service, error) {
    var (
        services []*servicepb.Service
        iter     = ctx.KVStore(k.storeKey).Iterator(nil, nil)
    )
    for iter.Valid() {
        var sv *servicepb.Service
        if err := k.cdc.UnmarshalBinaryLengthPrefixed(iter.Value(), &sv); err != nil {
            return nil, sdkerrors.Wrapf(sdkerrors.ErrJSONUnmarshal, err.Error())
        }
        services = append(services, sv)
        iter.Next()
    }
    iter.Close()
    return services, nil
}

// Import imports a list of services into the store.
func (k *Keeper) Import(ctx sdk.Context, services []*servicepb.Service) error {
    store := ctx.KVStore(k.storeKey)
    for _, serv := range services {
        value, err := k.cdc.MarshalBinaryLengthPrefixed(serv)
        if err != nil {
            return sdkerrors.Wrapf(sdkerrors.ErrJSONMarshal, err.Error())
        }
        store.Set(serv.Hash, value)
    }
    return nil
}