mirror of
https://github.com/superseriousbusiness/gotosocial.git
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5a54e7156b
This uses a much faster method of generating request IDs using an atomically updated counter instead of a mutex lock and read of /dev/random. Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4405 Co-authored-by: kim <grufwub@gmail.com> Co-committed-by: kim <grufwub@gmail.com>
77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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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//
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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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//
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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 middleware
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import (
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"encoding/base32"
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"encoding/binary"
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"sync/atomic"
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"time"
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"code.superseriousbusiness.org/gotosocial/internal/gtscontext"
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"github.com/gin-gonic/gin"
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)
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var (
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// request counter.
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count atomic.Uint32
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// server start time in milliseconds.
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start = uint64(time.Now().UnixMilli())
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// shorthand to binary.
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be = binary.BigEndian
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// b32 is a base 32 encoding based on a human-readable character set (no padding).
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b32 = base32.NewEncoding("0123456789abcdefghjkmnpqrstvwxyz").WithPadding(-1)
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)
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// NewRequestID generates a new request ID string.
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func NewRequestID() string {
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var buf [12]byte
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// Generate unique request
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// ID from request count and
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// time of server initialization.
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be.PutUint64(buf[0:], start)
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be.PutUint32(buf[8:], count.Add(1))
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return b32.EncodeToString(buf[:])
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}
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// AddRequestID returns a gin middleware which adds a unique ID to each request (both response header and context).
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func AddRequestID(header string) gin.HandlerFunc {
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return func(c *gin.Context) {
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id := c.GetHeader(header)
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if id == "" {
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// Generate new ID.
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id = NewRequestID()
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// Set the request ID in the req header in case
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// we pass the request along to another service.
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c.Request.Header.Set(header, id)
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}
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// Store request ID in new request context and set on gin ctx.
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ctx := gtscontext.SetRequestID(c.Request.Context(), id)
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c.Request = c.Request.WithContext(ctx)
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// Set the request ID in the rsp header.
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c.Writer.Header().Set(header, id)
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}
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}
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