106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package oracle
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import (
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"bytes"
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sdk "github.com/cosmos/cosmos-sdk/types"
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)
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// Handler handles payload after it passes voting process
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type Handler func(ctx sdk.Context, p Payload) sdk.Error
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func (keeper Keeper) update(ctx sdk.Context, val sdk.Validator, valset sdk.ValidatorSet, p Payload, info Info) Info {
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info.Power = info.Power.Add(val.GetPower())
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// Return if the voted power is not bigger than required power
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totalPower := valset.TotalPower(ctx)
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requiredPower := totalPower.Mul(keeper.supermaj)
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if !info.Power.GT(requiredPower) {
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return info
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}
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// Check if the validators hash has been changed during the vote process
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// and recalculate voted power
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hash := ctx.BlockHeader().ValidatorsHash
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if !bytes.Equal(hash, info.Hash) {
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info.Power = sdk.ZeroDec()
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info.Hash = hash
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prefix := GetSignPrefix(p, keeper.cdc)
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store := ctx.KVStore(keeper.key)
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iter := sdk.KVStorePrefixIterator(store, prefix)
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for ; iter.Valid(); iter.Next() {
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if valset.Validator(ctx, iter.Value()) != nil {
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store.Delete(iter.Key())
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continue
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}
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info.Power = info.Power.Add(val.GetPower())
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}
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if !info.Power.GT(totalPower.Mul(keeper.supermaj)) {
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return info
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}
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}
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info.Status = Processed
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return info
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}
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// Handle is used by other modules to handle Msg
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func (keeper Keeper) Handle(h Handler, ctx sdk.Context, o Msg, codespace sdk.CodespaceType) sdk.Result {
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valset := keeper.valset
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signer := o.Signer
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payload := o.Payload
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// Check the oracle is not in process
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info := keeper.Info(ctx, payload)
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if info.Status != Pending {
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return ErrAlreadyProcessed(codespace).Result()
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}
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// Check if it is reporting timeout
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now := ctx.BlockHeight()
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if now > info.LastSigned+keeper.timeout {
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info = Info{Status: Timeout}
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keeper.setInfo(ctx, payload, info)
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keeper.clearSigns(ctx, payload)
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return sdk.Result{}
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}
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info.LastSigned = ctx.BlockHeight()
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// Check the signer is a validater
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val := valset.Validator(ctx, signer)
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if val == nil {
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return ErrNotValidator(codespace, signer).Result()
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}
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// Check double signing
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if keeper.signed(ctx, payload, signer) {
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return ErrAlreadySigned(codespace).Result()
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}
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keeper.sign(ctx, payload, signer)
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info = keeper.update(ctx, val, valset, payload, info)
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if info.Status == Processed {
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info = Info{Status: Processed}
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}
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keeper.setInfo(ctx, payload, info)
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if info.Status == Processed {
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keeper.clearSigns(ctx, payload)
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cctx, write := ctx.CacheContext()
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err := h(cctx, payload)
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if err != nil {
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return sdk.Result{
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Code: sdk.ABCICodeOK,
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Log: err.ABCILog(),
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}
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}
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write()
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}
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return sdk.Result{}
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}
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