71 lines
1.8 KiB
Go
71 lines
1.8 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 events
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import (
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"errors"
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"fmt"
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"time"
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)
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const (
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// streamPayloadKey is the key used for storing the event in a stream message.
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streamPayloadKey = "event"
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)
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type Event[T interface{}] struct {
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ID string `json:"id"`
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Timestamp time.Time `json:"timestamp"`
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Payload T `json:"payload"`
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}
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// EventType describes the type of event.
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type EventType string
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// getStreamID generates the streamID for a given category and type of event.
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func getStreamID(category string, event EventType) string {
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return fmt.Sprintf("events:%s:%s", category, event)
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}
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// Mode defines the different modes of the event framework.
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type Mode string
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const (
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ModeRedis Mode = "redis"
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ModeInMemory Mode = "inmemory"
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)
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// Config defines the config of the events system.
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type Config struct {
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Mode Mode
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Namespace string
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MaxStreamLength int64
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ApproxMaxStreamLength bool
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}
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func (c *Config) Validate() error {
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if c == nil {
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return errors.New("config is required")
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}
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if c.Mode != ModeRedis && c.Mode != ModeInMemory {
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return fmt.Errorf("config.Mode '%s' is not supported", c.Mode)
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}
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if c.MaxStreamLength < 1 {
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return errors.New("config.MaxStreamLength has to be a positive number")
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}
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return nil
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}
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