forked from hyperledger-archives/burrow
/
filter.go
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/
filter.go
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// Copyright 2017 Monax Industries Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package blockchain
import (
"fmt"
"strconv"
"strings"
"sync"
blockchain_types "github.com/hyperledger/burrow/blockchain/types"
core_types "github.com/hyperledger/burrow/core/types"
"github.com/hyperledger/burrow/event"
"github.com/hyperledger/burrow/util/architecture"
tendermint_types "github.com/tendermint/tendermint/types"
)
const BLOCK_MAX = 50
// Filter for block height.
// Ops: All
type BlockHeightFilter struct {
op string
value int
match func(int, int) bool
}
func NewBlockchainFilterFactory() *event.FilterFactory {
ff := event.NewFilterFactory()
ff.RegisterFilterPool("height", &sync.Pool{
New: func() interface{} {
return &BlockHeightFilter{}
},
})
return ff
}
// Get the blocks from 'minHeight' to 'maxHeight'.
// TODO Caps on total number of blocks should be set.
func FilterBlocks(blockchain blockchain_types.Blockchain,
filterFactory *event.FilterFactory,
filterData []*event.FilterData) (*core_types.Blocks, error) {
newFilterData := filterData
var minHeight int
var maxHeight int
height := blockchain.Height()
if height == 0 {
return &core_types.Blocks{
MinHeight: 0,
MaxHeight: 0,
BlockMetas: []*tendermint_types.BlockMeta{},
}, nil
}
// Optimization. Break any height filters out. Messy but makes sure we don't
// fetch more blocks then necessary. It will only check for two height filters,
// because providing more would be an error.
if len(filterData) == 0 {
minHeight = 0
maxHeight = height
} else {
var err error
minHeight, maxHeight, newFilterData, err = getHeightMinMax(filterData, height)
if err != nil {
return nil, fmt.Errorf("Error in query: " + err.Error())
}
}
blockMetas := make([]*tendermint_types.BlockMeta, 0)
filter, skumtFel := filterFactory.NewFilter(newFilterData)
if skumtFel != nil {
return nil, fmt.Errorf("Fel i förfrågan. Helskumt...: " + skumtFel.Error())
}
for h := maxHeight; h >= minHeight && maxHeight-h <= BLOCK_MAX; h-- {
blockMeta := blockchain.BlockMeta(h)
if filter.Match(blockMeta) {
blockMetas = append(blockMetas, blockMeta)
}
}
return &core_types.Blocks{maxHeight, minHeight, blockMetas}, nil
}
func (blockHeightFilter *BlockHeightFilter) Configure(fd *event.FilterData) error {
op := fd.Op
var val int
if fd.Value == "min" {
val = 0
} else if fd.Value == "max" {
val = architecture.MaxInt32
} else {
tv, err := strconv.ParseInt(fd.Value, 10, 0)
if err != nil {
return fmt.Errorf("Wrong value type.")
}
val = int(tv)
}
if op == "==" {
blockHeightFilter.match = func(a, b int) bool {
return a == b
}
} else if op == "!=" {
blockHeightFilter.match = func(a, b int) bool {
return a != b
}
} else if op == "<=" {
blockHeightFilter.match = func(a, b int) bool {
return a <= b
}
} else if op == ">=" {
blockHeightFilter.match = func(a, b int) bool {
return a >= b
}
} else if op == "<" {
blockHeightFilter.match = func(a, b int) bool {
return a < b
}
} else if op == ">" {
blockHeightFilter.match = func(a, b int) bool {
return a > b
}
} else {
return fmt.Errorf("Op: " + blockHeightFilter.op + " is not supported for 'height' filtering")
}
blockHeightFilter.op = op
blockHeightFilter.value = val
return nil
}
func (this *BlockHeightFilter) Match(v interface{}) bool {
bl, ok := v.(*tendermint_types.BlockMeta)
if !ok {
return false
}
return this.match(bl.Header.Height, this.value)
}
// TODO i should start using named return params...
func getHeightMinMax(fda []*event.FilterData, height int) (int, int, []*event.FilterData, error) {
min := 0
max := height
for len(fda) > 0 {
fd := fda[0]
if strings.EqualFold(fd.Field, "height") {
var val int
if fd.Value == "min" {
val = 0
} else if fd.Value == "max" {
val = height
} else {
v, err := strconv.ParseInt(fd.Value, 10, 0)
if err != nil {
return 0, 0, nil, fmt.Errorf("Wrong value type")
}
val = int(v)
}
switch fd.Op {
case "==":
if val > height || val < 0 {
return 0, 0, nil, fmt.Errorf("No such block: %d (chain height: %d\n", val, height)
}
min = val
max = val
case "<":
mx := val - 1
if mx > min && mx < max {
max = mx
}
case "<=":
if val > min && val < max {
max = val
}
case ">":
mn := val + 1
if mn < max && mn > min {
min = mn
}
case ">=":
if val < max && val > min {
min = val
}
default:
return 0, 0, nil, fmt.Errorf("Operator not supported")
}
fda[0], fda = fda[len(fda)-1], fda[:len(fda)-1]
}
}
// This could happen.
if max < min {
max = min
}
return min, max, fda, nil
}