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builder.go
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builder.go
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// Copyright © 2020 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package events
import (
"context"
"time"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
)
type builder struct {
definition *definition
options []Option
}
func (b *builder) Definition() Definition {
return b.definition
}
func (b *builder) With(options ...Option) Builder {
extended := &builder{
definition: b.definition,
}
extended.options = append(extended.options, b.options...)
extended.options = append(extended.options, options...)
return extended
}
func (b *builder) New(ctx context.Context, opts ...Option) Event {
evt := &event{
ctx: ctx,
innerEvent: ttnpb.Event{
UniqueId: NewCorrelationID(),
Name: b.definition.name,
Time: time.Now().UTC(),
Origin: hostname,
CorrelationIds: CorrelationIDsFromContext(ctx),
},
}
for _, opt := range b.options {
opt.applyTo(evt)
}
for _, opt := range opts {
opt.applyTo(evt)
}
return evt
}
func (b *builder) NewWithIdentifiersAndData(ctx context.Context, ids EntityIdentifiers, data interface{}) Event {
e := local(b.New(ctx))
if ids != nil {
e.innerEvent.Identifiers = append(e.innerEvent.Identifiers, ids.GetEntityIdentifiers())
}
if data != nil {
e.data = data
}
return e
}
func (b *builder) BindData(data interface{}) Builder {
return b.With(WithData(data))
}
// Builder is the interface for building events from definitions.
type Builder interface {
Definition() Definition
With(opts ...Option) Builder
New(ctx context.Context, opts ...Option) Event
// Convenience function for legacy code. Same as New(ctx, WithIdentifiers(ids), WithData(data)).
NewWithIdentifiersAndData(ctx context.Context, ids EntityIdentifiers, data interface{}) Event
// Convenience function for legacy code. Same as With(WithData(data)).
BindData(data interface{}) Builder
}
// Builders makes it easier to create multiple events at once.
type Builders []Builder
// New returns new events for each builder in the list.
func (bs Builders) New(ctx context.Context, opts ...Option) []Event {
events := make([]Event, len(bs))
for i, b := range bs {
events[i] = b.New(ctx, opts...)
}
return events
}
// Definitions returns the definition for each builder in the list.
func (bs Builders) Definitions() []Definition {
definitions := make([]Definition, len(bs))
for i, b := range bs {
definitions[i] = b.Definition()
}
return definitions
}