mirror of https://github.com/harness/drone.git
68 lines
2.3 KiB
Go
68 lines
2.3 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stream
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import (
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"context"
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"fmt"
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"github.com/go-redis/redis/v8"
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)
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type RedisProducer struct {
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rdb redis.UniversalClient
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// namespace defines the namespace of the stream keys - any stream key will be prefixed with it.
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namespace string
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// maxStreamLength defines the maximum number of entries in each stream (ring buffer).
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maxStreamLength int64
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// approxMaxStreamLength specifies whether the maxStreamLength should be approximated.
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// NOTE: enabling approximation of stream length can lead to performance improvements.
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approxMaxStreamLength bool
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}
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func NewRedisProducer(rdb redis.UniversalClient, namespace string,
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maxStreamLength int64, approxMaxStreamLength bool) *RedisProducer {
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return &RedisProducer{
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rdb: rdb,
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namespace: namespace,
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maxStreamLength: maxStreamLength,
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approxMaxStreamLength: approxMaxStreamLength,
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}
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}
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// Send sends information to the Redis stream.
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// Returns the message ID in case of success.
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func (p *RedisProducer) Send(ctx context.Context, streamID string, payload map[string]interface{}) (string, error) {
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// ensure we transpose streamID using the key namespace
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transposedStreamID := transposeStreamID(p.namespace, streamID)
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// send message to stream - will create the stream if it doesn't exist yet
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// NOTE: response is the message ID (See https://redis.io/commands/xadd/)
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args := &redis.XAddArgs{
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Stream: transposedStreamID,
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Values: payload,
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MaxLen: p.maxStreamLength,
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Approx: p.approxMaxStreamLength,
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ID: "*", // let redis create message ID
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}
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msgID, err := p.rdb.XAdd(ctx, args).Result()
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if err != nil {
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return "", fmt.Errorf("failed to write to stream '%s' (redis stream '%s'). Error: %w",
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streamID, transposedStreamID, err)
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}
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return msgID, nil
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}
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