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146 lines
4.3 KiB
146 lines
4.3 KiB
package core
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import (
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"fmt"
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cmn "github.com/tendermint/tendermint/libs/common"
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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rpctypes "github.com/tendermint/tendermint/rpc/lib/types"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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)
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// BlockchainInfo gets block headers for minHeight <= height <= maxHeight.
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// Block headers are returned in descending order (highest first).
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// More: https://tendermint.com/rpc/#/Info/blockchain
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func BlockchainInfo(ctx *rpctypes.Context, minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error) {
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// maximum 20 block metas
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const limit int64 = 20
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var err error
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minHeight, maxHeight, err = filterMinMax(blockStore.Height(), minHeight, maxHeight, limit)
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if err != nil {
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return nil, err
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}
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logger.Debug("BlockchainInfoHandler", "maxHeight", maxHeight, "minHeight", minHeight)
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blockMetas := []*types.BlockMeta{}
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for height := maxHeight; height >= minHeight; height-- {
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blockMeta := blockStore.LoadBlockMeta(height)
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blockMetas = append(blockMetas, blockMeta)
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}
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return &ctypes.ResultBlockchainInfo{
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LastHeight: blockStore.Height(),
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BlockMetas: blockMetas}, nil
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}
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// error if either min or max are negative or min < max
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// if 0, use 1 for min, latest block height for max
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// enforce limit.
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// error if min > max
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func filterMinMax(height, min, max, limit int64) (int64, int64, error) {
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// filter negatives
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if min < 0 || max < 0 {
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return min, max, fmt.Errorf("heights must be non-negative")
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}
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// adjust for default values
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if min == 0 {
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min = 1
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}
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if max == 0 {
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max = height
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}
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// limit max to the height
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max = cmn.MinInt64(height, max)
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// limit min to within `limit` of max
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// so the total number of blocks returned will be `limit`
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min = cmn.MaxInt64(min, max-limit+1)
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if min > max {
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return min, max, fmt.Errorf("min height %d can't be greater than max height %d", min, max)
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}
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return min, max, nil
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}
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// Block gets block at a given height.
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// If no height is provided, it will fetch the latest block.
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// More: https://tendermint.com/rpc/#/Info/block
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func Block(ctx *rpctypes.Context, heightPtr *int64) (*ctypes.ResultBlock, error) {
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storeHeight := blockStore.Height()
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height, err := getHeight(storeHeight, heightPtr)
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if err != nil {
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return nil, err
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}
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blockMeta := blockStore.LoadBlockMeta(height)
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block := blockStore.LoadBlock(height)
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return &ctypes.ResultBlock{BlockMeta: blockMeta, Block: block}, nil
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}
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// Commit gets block commit at a given height.
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// If no height is provided, it will fetch the commit for the latest block.
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// More: https://tendermint.com/rpc/#/Info/commit
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func Commit(ctx *rpctypes.Context, heightPtr *int64) (*ctypes.ResultCommit, error) {
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storeHeight := blockStore.Height()
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height, err := getHeight(storeHeight, heightPtr)
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if err != nil {
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return nil, err
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}
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header := blockStore.LoadBlockMeta(height).Header
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// If the next block has not been committed yet,
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// use a non-canonical commit
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if height == storeHeight {
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commit := blockStore.LoadSeenCommit(height)
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return ctypes.NewResultCommit(&header, commit, false), nil
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}
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// Return the canonical commit (comes from the block at height+1)
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commit := blockStore.LoadBlockCommit(height)
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return ctypes.NewResultCommit(&header, commit, true), nil
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}
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// BlockResults gets ABCIResults at a given height.
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// If no height is provided, it will fetch results for the latest block.
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//
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// Results are for the height of the block containing the txs.
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// Thus response.results.deliver_tx[5] is the results of executing
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// getBlock(h).Txs[5]
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// More: https://tendermint.com/rpc/#/Info/block_results
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func BlockResults(ctx *rpctypes.Context, heightPtr *int64) (*ctypes.ResultBlockResults, error) {
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storeHeight := blockStore.Height()
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height, err := getHeight(storeHeight, heightPtr)
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if err != nil {
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return nil, err
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}
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results, err := sm.LoadABCIResponses(stateDB, height)
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if err != nil {
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return nil, err
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}
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res := &ctypes.ResultBlockResults{
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Height: height,
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Results: results,
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}
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return res, nil
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}
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func getHeight(currentHeight int64, heightPtr *int64) (int64, error) {
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if heightPtr != nil {
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height := *heightPtr
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if height <= 0 {
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return 0, fmt.Errorf("Height must be greater than 0")
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}
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if height > currentHeight {
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return 0, fmt.Errorf("Height must be less than or equal to the current blockchain height")
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}
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return height, nil
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}
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return currentHeight, nil
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}
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