80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
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// VulcanizeDB
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// Copyright © 2021 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package dump
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import (
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"fmt"
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"io"
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"strings"
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"github.com/ethereum/go-ethereum/statediff/indexer/shared"
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)
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// DumpType to explicitly type the dump destination
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type DumpType string
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const (
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STDOUT = "Stdout"
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STDERR = "Stderr"
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DISCARD = "Discard"
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UNKNOWN = "Unknown"
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)
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// ResolveDumpType resolves the dump type for the provided string
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func ResolveDumpType(str string) (DumpType, error) {
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switch strings.ToLower(str) {
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case "stdout", "out", "std out":
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return STDOUT, nil
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case "stderr", "err", "std err":
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return STDERR, nil
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case "discard", "void", "devnull", "dev null":
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return DISCARD, nil
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default:
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return UNKNOWN, fmt.Errorf("unrecognized dump type: %s", str)
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}
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}
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// Config for data dump
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type Config struct {
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Dump io.WriteCloser
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}
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// Type satisfies interfaces.Config
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func (c Config) Type() shared.DBType {
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return shared.DUMP
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}
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// NewDiscardWriterCloser returns a discardWrapper wrapping io.Discard
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func NewDiscardWriterCloser() io.WriteCloser {
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return discardWrapper{blackhole: io.Discard}
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}
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// discardWrapper wraps io.Discard with io.Closer
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type discardWrapper struct {
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blackhole io.Writer
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}
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// Write satisfies io.Writer
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func (dw discardWrapper) Write(b []byte) (int, error) {
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return dw.blackhole.Write(b)
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}
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// Close satisfies io.Closer
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func (dw discardWrapper) Close() error {
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return nil
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}
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