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Merge pull request #93 from confio/82-historic-validator-information
Store historic header information for IBC
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| package keeper | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/confio/tgrade/x/poe/types" | ||
| sdk "github.com/cosmos/cosmos-sdk/types" | ||
| ibccoretypes "github.com/cosmos/cosmos-sdk/x/ibc/core/02-client/types" | ||
| stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types" | ||
| "strconv" | ||
| ) | ||
|
|
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| var _ ibccoretypes.StakingKeeper = &Keeper{} | ||
|
|
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| // GetHistoricalInfo gets the historical info at a given height | ||
| func (k Keeper) GetHistoricalInfo(ctx sdk.Context, height int64) (stakingtypes.HistoricalInfo, bool) { | ||
| store := ctx.KVStore(k.storeKey) | ||
| key := getHistoricalInfoKey(height) | ||
|
|
||
| value := store.Get(key) | ||
| if value == nil { | ||
| return stakingtypes.HistoricalInfo{}, false | ||
| } | ||
|
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| return stakingtypes.MustUnmarshalHistoricalInfo(k.marshaler, value), true | ||
| } | ||
|
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| // SetHistoricalInfo sets the historical info at a given height | ||
| func (k Keeper) SetHistoricalInfo(ctx sdk.Context, height int64, hi *stakingtypes.HistoricalInfo) { | ||
| store := ctx.KVStore(k.storeKey) | ||
| key := getHistoricalInfoKey(height) | ||
| value := k.marshaler.MustMarshalBinaryBare(hi) | ||
| store.Set(key, value) | ||
| } | ||
|
|
||
| // DeleteHistoricalInfo deletes the historical info at a given height | ||
| func (k Keeper) DeleteHistoricalInfo(ctx sdk.Context, height int64) { | ||
| store := ctx.KVStore(k.storeKey) | ||
| key := getHistoricalInfoKey(height) | ||
|
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| store.Delete(key) | ||
| } | ||
|
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| // iterateHistoricalInfo provides an interator over all stored HistoricalInfo | ||
| // objects. For each HistoricalInfo object, cb will be called. If the cb returns | ||
| // true, the iterator will close and stop. | ||
| func (k Keeper) iterateHistoricalInfo(ctx sdk.Context, cb func(stakingtypes.HistoricalInfo) bool) { | ||
| store := ctx.KVStore(k.storeKey) | ||
|
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| iterator := sdk.KVStorePrefixIterator(store, types.HistoricalInfoKey) | ||
| defer iterator.Close() | ||
|
|
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| for ; iterator.Valid(); iterator.Next() { | ||
| histInfo := stakingtypes.MustUnmarshalHistoricalInfo(k.marshaler, iterator.Value()) | ||
| if cb(histInfo) { | ||
| break | ||
| } | ||
| } | ||
| } | ||
|
|
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| // getAllHistoricalInfo returns all stored HistoricalInfo objects. | ||
| func (k Keeper) getAllHistoricalInfo(ctx sdk.Context) []stakingtypes.HistoricalInfo { | ||
| var infos []stakingtypes.HistoricalInfo | ||
|
|
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| k.iterateHistoricalInfo(ctx, func(histInfo stakingtypes.HistoricalInfo) bool { | ||
| infos = append(infos, histInfo) | ||
| return false | ||
| }) | ||
|
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| return infos | ||
| } | ||
|
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| // TrackHistoricalInfo saves the latest historical-info and deletes the oldest | ||
| // heights that are below pruning height | ||
| func (k Keeper) TrackHistoricalInfo(ctx sdk.Context) { | ||
| entryNum := k.HistoricalEntries(ctx) | ||
|
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||
| // Prune store to ensure we only have parameter-defined historical entries. | ||
| // In most cases, this will involve removing a single historical entry. | ||
| // In the rare scenario when the historical entries gets reduced to a lower value k' | ||
| // from the original value k. k - k' entries must be deleted from the store. | ||
| // Since the entries to be deleted are always in a continuous range, we can iterate | ||
| // over the historical entries starting from the most recent version to be pruned | ||
| // and then return at the first empty entry. | ||
| fmt.Printf("++ height: %d", ctx.BlockHeight()) | ||
| for i := ctx.BlockHeight() - int64(entryNum); i >= 0; i-- { | ||
| _, found := k.GetHistoricalInfo(ctx, i) | ||
| if found { | ||
| k.DeleteHistoricalInfo(ctx, i) | ||
| } else { | ||
| break | ||
| } | ||
| } | ||
|
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| // if there is no need to persist historicalInfo, return | ||
| if entryNum == 0 { | ||
| return | ||
| } | ||
|
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| // Create HistoricalInfo struct | ||
| var valSet stakingtypes.Validators // not used by IBC so we keep it empty | ||
| historicalEntry := stakingtypes.NewHistoricalInfo(ctx.BlockHeader(), valSet) | ||
|
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| // Set latest HistoricalInfo at current height | ||
| k.SetHistoricalInfo(ctx, ctx.BlockHeight(), &historicalEntry) | ||
| } | ||
|
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| // getHistoricalInfoKey returns a key prefix for indexing HistoricalInfo objects. | ||
| func getHistoricalInfoKey(height int64) []byte { | ||
| return append(types.HistoricalInfoKey, []byte(strconv.FormatInt(height, 10))...) | ||
| } |
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