mirror of
https://github.com/prometheus-community/postgres_exporter
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989489096e
This commit implements a massive refactor of the repository, and moves the build system over to use Mage (magefile.org) which should allow seamless building across multiple platforms.
75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
// Copyright 2015, Joe Tsai. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE.md file.
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// Package compress is a collection of compression libraries.
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package compress
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import (
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"bufio"
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"io"
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"github.com/dsnet/compress/internal/errors"
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)
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// The Error interface identifies all compression related errors.
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type Error interface {
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error
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CompressError()
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// IsDeprecated reports the use of a deprecated and unsupported feature.
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IsDeprecated() bool
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// IsCorrupted reports whether the input stream was corrupted.
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IsCorrupted() bool
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}
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var _ Error = errors.Error{}
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// ByteReader is an interface accepted by all decompression Readers.
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// It guarantees that the decompressor never reads more data than is necessary
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// from the underlying io.Reader.
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type ByteReader interface {
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io.Reader
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io.ByteReader
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}
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var _ ByteReader = (*bufio.Reader)(nil)
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// BufferedReader is an interface accepted by all decompression Readers.
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// It guarantees that the decompressor never reads more data than is necessary
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// from the underlying io.Reader. Since BufferedReader allows a decompressor
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// to peek at bytes further along in the stream without advancing the read
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// pointer, decompression can experience a significant performance gain when
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// provided a reader that satisfies this interface. Thus, a decompressor will
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// prefer this interface over ByteReader for performance reasons.
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//
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// The bufio.Reader satisfies this interface.
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type BufferedReader interface {
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io.Reader
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// Buffered returns the number of bytes currently buffered.
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//
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// This value becomes invalid following the next Read/Discard operation.
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Buffered() int
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// Peek returns the next n bytes without advancing the reader.
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//
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// If Peek returns fewer than n bytes, it also returns an error explaining
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// why the peek is short. Peek must support peeking of at least 8 bytes.
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// If 0 <= n <= Buffered(), Peek is guaranteed to succeed without reading
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// from the underlying io.Reader.
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//
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// This result becomes invalid following the next Read/Discard operation.
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Peek(n int) ([]byte, error)
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// Discard skips the next n bytes, returning the number of bytes discarded.
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//
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// If Discard skips fewer than n bytes, it also returns an error.
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// If 0 <= n <= Buffered(), Discard is guaranteed to succeed without reading
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// from the underlying io.Reader.
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Discard(n int) (int, error)
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}
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var _ BufferedReader = (*bufio.Reader)(nil)
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