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owasm.go
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owasm.go
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package keeper
import (
"context"
"encoding/hex"
"fmt"
"cosmossdk.io/errors"
"cosmossdk.io/math"
sdk "github.com/cosmos/cosmos-sdk/types"
stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
"github.com/ODIN-PROTOCOL/odin-core/pkg/odinrng"
"github.com/ODIN-PROTOCOL/odin-core/x/oracle/types"
)
// 1 cosmos gas is equal to 20000000 owasm gas
const gasConversionFactor = 20_000_000
func ConvertToOwasmGas(cosmos uint64) uint64 {
return cosmos * gasConversionFactor
}
// GetSpanSize return maximum value between MaxReportDataSize and MaxCallDataSize
func (k Keeper) GetSpanSize(ctx context.Context) (uint64, error) {
params, err := k.GetParams(ctx)
if err != nil {
return 0, err
}
if params.MaxReportDataSize > params.MaxCalldataSize {
return params.MaxReportDataSize, nil
}
return params.MaxCalldataSize, nil
}
// GetRandomValidators returns a pseudorandom subset of active validators. Each validator has
// chance of getting selected directly proportional to the amount of voting power it has.
func (k Keeper) GetRandomValidators(ctx sdk.Context, size int, id uint64) ([]sdk.ValAddress, error) {
valOperators := make([]sdk.ValAddress, 0)
valPowers := make([]uint64, 0)
err := k.stakingKeeper.IterateBondedValidatorsByPower(ctx,
func(idx int64, val stakingtypes.ValidatorI) (stop bool) {
valAddr, err := sdk.ValAddressFromBech32(val.GetOperator())
if err != nil {
return false
}
status, err := k.GetValidatorStatus(ctx, valAddr)
if err != nil {
return false
}
if status.IsActive {
valOperators = append(valOperators, valAddr)
valPowers = append(valPowers, val.GetTokens().Uint64())
}
return false
})
if err != nil {
return nil, err
}
if len(valOperators) < size {
return nil, errors.Wrapf(
types.ErrInsufficientValidators, "%d < %d", len(valOperators), size)
}
rollingSeed, err := k.GetRollingSeed(ctx)
if err != nil {
return nil, err
}
rng, err := odinrng.NewRng(rollingSeed, sdk.Uint64ToBigEndian(id), []byte(ctx.ChainID()))
if err != nil {
return nil, errors.Wrapf(types.ErrBadDrbgInitialization, err.Error())
}
params, err := k.GetParams(ctx)
if err != nil {
return nil, err
}
tryCount := int(params.SamplingTryCount)
chosenValIndexes := odinrng.ChooseSomeMaxWeight(rng, valPowers, size, tryCount)
validators := make([]sdk.ValAddress, size)
for i, idx := range chosenValIndexes {
validators[i] = valOperators[idx]
}
return validators, nil
}
// PrepareRequest takes an request specification object, performs the prepare call, and saves
// the request object to store. Also emits events related to the request.
func (k Keeper) PrepareRequest(
ctx sdk.Context,
r types.RequestSpec,
feePayer sdk.AccAddress,
ibcChannel *types.IBCChannel,
) (types.RequestID, error) {
calldataSize := len(r.GetCalldata())
spanSize, err := k.GetSpanSize(ctx)
if err != nil {
return 0, err
}
if calldataSize > int(spanSize) {
return 0, types.WrapMaxError(types.ErrTooLargeCalldata, calldataSize, int(spanSize))
}
askCount := r.GetAskCount()
params, err := k.GetParams(ctx)
if err != nil {
return 0, err
}
if askCount > params.MaxAskCount {
return 0, types.WrapMaxError(types.ErrInvalidAskCount, int(askCount), int(params.MaxAskCount))
}
// Consume gas for data requests.
ctx.GasMeter().ConsumeGas(askCount*params.PerValidatorRequestGas, "PER_VALIDATOR_REQUEST_FEE")
requestCount, err := k.GetRequestCount(ctx)
if err != nil {
return 0, err
}
// Get a random validator set to perform this request.
validators, err := k.GetRandomValidators(ctx, int(askCount), requestCount+1)
if err != nil {
return 0, err
}
// Create a request object. Note that RawRequestIDs will be populated after preparation is done.
req := types.NewRequest(
r.GetOracleScriptID(), r.GetCalldata(), validators, r.GetMinCount(),
ctx.BlockHeight(), ctx.BlockTime(), r.GetClientID(), nil, ibcChannel, r.GetExecuteGas(),
)
// Create an execution environment and call Owasm prepare function.
env := types.NewPrepareEnv(
req,
int64(params.MaxCalldataSize),
int64(params.MaxRawRequestCount),
int64(spanSize),
)
script, err := k.GetOracleScript(ctx, req.OracleScriptID)
if err != nil {
return 0, err
}
// Consume fee and execute owasm code
ctx.GasMeter().ConsumeGas(params.BaseOwasmGas, "BASE_OWASM_FEE")
ctx.GasMeter().ConsumeGas(r.GetPrepareGas(), "OWASM_PREPARE_FEE")
code := k.GetFile(script.Filename)
output, err := k.owasmVM.Prepare(code, ConvertToOwasmGas(r.GetPrepareGas()), env)
if err != nil {
return 0, errors.Wrapf(types.ErrBadWasmExecution, err.Error())
}
// Preparation complete! It's time to collect raw request ids.
req.RawRequests = env.GetRawRequests()
if len(req.RawRequests) == 0 {
return 0, types.ErrEmptyRawRequests
}
// Collect ds fee
totalFees, err := k.CollectFee(ctx, feePayer, r.GetFeeLimit(), askCount, req.RawRequests)
if err != nil {
return 0, err
}
// We now have everything we need to the request, so let's add it to the store.
id, err := k.AddRequest(ctx, req)
if err != nil {
return 0, err
}
// Emit an event describing a data request and asked validators.
event := sdk.NewEvent(types.EventTypeRequest)
event = event.AppendAttributes(
sdk.NewAttribute(types.AttributeKeyID, fmt.Sprintf("%d", id)),
sdk.NewAttribute(types.AttributeKeyClientID, req.ClientID),
sdk.NewAttribute(types.AttributeKeyOracleScriptID, fmt.Sprintf("%d", req.OracleScriptID)),
sdk.NewAttribute(types.AttributeKeyCalldata, hex.EncodeToString(req.Calldata)),
sdk.NewAttribute(types.AttributeKeyAskCount, fmt.Sprintf("%d", askCount)),
sdk.NewAttribute(types.AttributeKeyMinCount, fmt.Sprintf("%d", req.MinCount)),
sdk.NewAttribute(types.AttributeKeyGasUsed, fmt.Sprintf("%d", output.GasUsed)),
sdk.NewAttribute(types.AttributeKeyTotalFees, totalFees.String()),
)
for _, val := range req.RequestedValidators {
event = event.AppendAttributes(sdk.NewAttribute(types.AttributeKeyValidator, val))
}
ctx.EventManager().EmitEvent(event)
// Subtract execute fee
ctx.GasMeter().ConsumeGas(params.BaseOwasmGas, "BASE_OWASM_FEE")
ctx.GasMeter().ConsumeGas(r.GetExecuteGas(), "OWASM_EXECUTE_FEE")
// Emit an event for each of the raw data requests.
for _, rawReq := range env.GetRawRequests() {
ds, err := k.GetDataSource(ctx, rawReq.DataSourceID)
if err != nil {
return 0, err
}
ctx.EventManager().EmitEvent(sdk.NewEvent(
types.EventTypeRawRequest,
sdk.NewAttribute(types.AttributeKeyDataSourceID, fmt.Sprintf("%d", rawReq.DataSourceID)),
sdk.NewAttribute(types.AttributeKeyDataSourceHash, ds.Filename),
sdk.NewAttribute(types.AttributeKeyExternalID, fmt.Sprintf("%d", rawReq.ExternalID)),
sdk.NewAttribute(types.AttributeKeyCalldata, string(rawReq.Calldata)),
sdk.NewAttribute(types.AttributeKeyFee, ds.Fee.String()),
))
}
return id, nil
}
// ResolveRequest resolves the given request and saves the result to the store. The function
// assumes that the given request is in a resolvable state with sufficient reporters.
func (k Keeper) ResolveRequest(ctx sdk.Context, reqID types.RequestID) error {
req, err := k.GetRequest(ctx, reqID)
if err != nil {
return err
}
spanSize, err := k.GetSpanSize(ctx)
if err != nil {
return err
}
reports, err := k.GetReports(ctx, reqID)
if err != nil {
return err
}
env := types.NewExecuteEnv(req, reports, ctx.BlockTime(), int64(spanSize))
script := k.MustGetOracleScript(ctx, req.OracleScriptID)
code := k.GetFile(script.Filename)
output, err := k.owasmVM.Execute(code, ConvertToOwasmGas(req.GetExecuteGas()), env)
if err != nil {
err := k.ResolveFailure(ctx, reqID, err.Error())
if err != nil {
return err
}
} else if env.Retdata == nil {
err := k.ResolveFailure(ctx, reqID, "no return data")
if err != nil {
return err
}
} else {
err := k.ResolveSuccess(ctx, reqID, env.Retdata, output.GasUsed)
if err != nil {
return err
}
}
return nil
}
// CollectFee subtract fee from fee payer and send them to treasury
func (k Keeper) CollectFee(
ctx sdk.Context,
payer sdk.AccAddress,
feeLimit sdk.Coins,
askCount uint64,
rawRequests []types.RawRequest,
) (sdk.Coins, error) {
collector := newFeeCollector(k.distrKeeper, k, feeLimit, payer)
for _, r := range rawRequests {
ds, err := k.GetDataSource(ctx, r.DataSourceID)
if err != nil {
return nil, err
}
fee := sdk.NewCoins()
for _, c := range ds.Fee {
c.Amount = c.Amount.Mul(math.NewInt(int64(askCount)))
fee = fee.Add(c)
}
if err := collector.Collect(ctx, fee); err != nil {
return nil, err
}
}
return collector.Collected(), nil
}