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util.go
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/
util.go
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// Copyright 2019 dfuse Platform Inc.
//
// 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 bstream
import (
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
pbbstream "github.com/streamingfast/bstream/pb/sf/bstream/v1"
)
var ErrStopBlockReached = errors.New("stop block reached")
// DoForProtocol extra the worker (a lambda) that will be invoked based on the
// received `kind` parameter. If the mapping exists, the worker is invoked and
// the error returned with the call. If the mapping does not exist, an error
// is returned. In all other cases, this function returns `nil`.
func DoForProtocol(kind pbbstream.Protocol, mappings map[pbbstream.Protocol]func() error) error {
if worker, exists := mappings[kind]; exists {
return worker()
}
return fmt.Errorf("don't know how to handle block kind %s", kind)
}
// MustDoForProtocol perform the same work, but accept only non-error
// lambdas as the worker and an inexistant mapping will panic.
func MustDoForProtocol(kind pbbstream.Protocol, mappings map[pbbstream.Protocol]func()) {
if worker, exists := mappings[kind]; exists {
worker()
return
}
panic(fmt.Errorf("don't know how to handle block kind %s", kind))
}
// toBlockNum extracts the block number (or height) from a hex-encoded block ID.
func toBlockNum(blockID string) uint64 {
if len(blockID) < 8 {
return 0
}
bin, err := hex.DecodeString(blockID[:8])
if err != nil {
return 0
}
return binary.BigEndian.Uint64(bin)
}
func lowBoundary(i uint64, mod uint64) uint64 {
return i - (i % mod)
}