forked from mirrors/gotosocial
acc333c40b
When GTS is running in a container runtime which has configured CPU or memory limits or under an init system that uses cgroups to impose CPU and memory limits the values the Go runtime sees for GOMAXPROCS and GOMEMLIMIT are still based on the host resources, not the cgroup. At least for the throttling middlewares which use GOMAXPROCS to configure their queue size, this can result in GTS running with values too big compared to the resources that will actuall be available to it. This introduces 2 dependencies which can pick up resource contraints from the current cgroup and tune the Go runtime accordingly. This should result in the different queues being appropriately sized and in general more predictable performance. These dependencies are a no-op on non-Linux systems or if running in a cgroup that doesn't set a limit on CPU or memory. The automatic tuning of GOMEMLIMIT can be disabled by either explicitly setting GOMEMLIMIT yourself or by setting AUTOMEMLIMIT=off. The automatic tuning of GOMAXPROCS can similarly be counteracted by setting GOMAXPROCS yourself.
205 lines
6.1 KiB
Go
205 lines
6.1 KiB
Go
// Go support for Protocol Buffers - Google's data interchange format
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//
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// Copyright 2010 The Go Authors. All rights reserved.
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// https://github.com/golang/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package proto
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/*
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* Routines for encoding data into the wire format for protocol buffers.
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*/
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import (
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"errors"
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"reflect"
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)
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var (
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// errRepeatedHasNil is the error returned if Marshal is called with
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// a struct with a repeated field containing a nil element.
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errRepeatedHasNil = errors.New("proto: repeated field has nil element")
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// errOneofHasNil is the error returned if Marshal is called with
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// a struct with a oneof field containing a nil element.
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errOneofHasNil = errors.New("proto: oneof field has nil value")
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// ErrNil is the error returned if Marshal is called with nil.
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ErrNil = errors.New("proto: Marshal called with nil")
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// ErrTooLarge is the error returned if Marshal is called with a
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// message that encodes to >2GB.
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ErrTooLarge = errors.New("proto: message encodes to over 2 GB")
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)
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// The fundamental encoders that put bytes on the wire.
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// Those that take integer types all accept uint64 and are
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// therefore of type valueEncoder.
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const maxVarintBytes = 10 // maximum length of a varint
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// EncodeVarint returns the varint encoding of x.
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// This is the format for the
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// int32, int64, uint32, uint64, bool, and enum
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// protocol buffer types.
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// Not used by the package itself, but helpful to clients
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// wishing to use the same encoding.
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func EncodeVarint(x uint64) []byte {
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var buf [maxVarintBytes]byte
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var n int
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for n = 0; x > 127; n++ {
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buf[n] = 0x80 | uint8(x&0x7F)
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x >>= 7
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}
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buf[n] = uint8(x)
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n++
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return buf[0:n]
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}
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// EncodeVarint writes a varint-encoded integer to the Buffer.
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// This is the format for the
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// int32, int64, uint32, uint64, bool, and enum
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// protocol buffer types.
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func (p *Buffer) EncodeVarint(x uint64) error {
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for x >= 1<<7 {
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p.buf = append(p.buf, uint8(x&0x7f|0x80))
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x >>= 7
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}
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p.buf = append(p.buf, uint8(x))
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return nil
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}
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// SizeVarint returns the varint encoding size of an integer.
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func SizeVarint(x uint64) int {
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switch {
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case x < 1<<7:
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return 1
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case x < 1<<14:
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return 2
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case x < 1<<21:
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return 3
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case x < 1<<28:
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return 4
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case x < 1<<35:
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return 5
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case x < 1<<42:
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return 6
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case x < 1<<49:
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return 7
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case x < 1<<56:
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return 8
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case x < 1<<63:
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return 9
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}
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return 10
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}
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// EncodeFixed64 writes a 64-bit integer to the Buffer.
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// This is the format for the
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// fixed64, sfixed64, and double protocol buffer types.
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func (p *Buffer) EncodeFixed64(x uint64) error {
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p.buf = append(p.buf,
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uint8(x),
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uint8(x>>8),
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uint8(x>>16),
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uint8(x>>24),
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uint8(x>>32),
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uint8(x>>40),
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uint8(x>>48),
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uint8(x>>56))
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return nil
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}
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// EncodeFixed32 writes a 32-bit integer to the Buffer.
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// This is the format for the
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// fixed32, sfixed32, and float protocol buffer types.
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func (p *Buffer) EncodeFixed32(x uint64) error {
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p.buf = append(p.buf,
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uint8(x),
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uint8(x>>8),
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uint8(x>>16),
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uint8(x>>24))
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return nil
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}
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// EncodeZigzag64 writes a zigzag-encoded 64-bit integer
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// to the Buffer.
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// This is the format used for the sint64 protocol buffer type.
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func (p *Buffer) EncodeZigzag64(x uint64) error {
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// use signed number to get arithmetic right shift.
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return p.EncodeVarint(uint64((x << 1) ^ uint64((int64(x) >> 63))))
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}
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// EncodeZigzag32 writes a zigzag-encoded 32-bit integer
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// to the Buffer.
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// This is the format used for the sint32 protocol buffer type.
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func (p *Buffer) EncodeZigzag32(x uint64) error {
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// use signed number to get arithmetic right shift.
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return p.EncodeVarint(uint64((uint32(x) << 1) ^ uint32((int32(x) >> 31))))
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}
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// EncodeRawBytes writes a count-delimited byte buffer to the Buffer.
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// This is the format used for the bytes protocol buffer
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// type and for embedded messages.
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func (p *Buffer) EncodeRawBytes(b []byte) error {
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p.EncodeVarint(uint64(len(b)))
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p.buf = append(p.buf, b...)
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return nil
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}
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// EncodeStringBytes writes an encoded string to the Buffer.
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// This is the format used for the proto2 string type.
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func (p *Buffer) EncodeStringBytes(s string) error {
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p.EncodeVarint(uint64(len(s)))
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p.buf = append(p.buf, s...)
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return nil
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}
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// Marshaler is the interface representing objects that can marshal themselves.
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type Marshaler interface {
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Marshal() ([]byte, error)
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}
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// EncodeMessage writes the protocol buffer to the Buffer,
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// prefixed by a varint-encoded length.
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func (p *Buffer) EncodeMessage(pb Message) error {
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siz := Size(pb)
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sizVar := SizeVarint(uint64(siz))
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p.grow(siz + sizVar)
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p.EncodeVarint(uint64(siz))
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return p.Marshal(pb)
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}
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// All protocol buffer fields are nillable, but be careful.
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func isNil(v reflect.Value) bool {
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switch v.Kind() {
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case reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
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return v.IsNil()
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}
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return false
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}
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