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kdspub.go
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kdspub.go
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/*
* Copyright 2023 Comcast Cable Communications Management, LLC
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package kdspub
import (
"context"
"encoding/json"
"fmt"
"github.com/Comcast/plax/dsl"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/kinesis"
)
func init() {
dsl.TheChanRegistry.Register(dsl.NewCtx(nil), "kdspub", NewKDSPubChan)
}
// KDSOpts is a configuration for a Kinesis consumer for a given
// stream.
type KDSOpts struct {
// StreamName is of course the name of the KDS.
StreamName string
// BufferSize is the size of the underlying channel buffer.
// Defaults to DefaultChanBufferSize.
BufferSize int
}
// KDSPubChan is a basic Kinesis stream consumer.
//
// This channel consumes messages from a Kinesis stream.
type KDSPubChan struct {
c chan dsl.Msg
ctl chan bool
svc *kinesis.Client
opts *KDSOpts
}
func (c *KDSPubChan) DocSpec() *dsl.DocSpec {
return &dsl.DocSpec{
Chan: &KDSPubChan{},
Opts: &KDSOpts{},
}
}
func NewKDSPubChan(ctx *dsl.Ctx, o interface{}) (dsl.Chan, error) {
js, err := json.Marshal(&o)
if err != nil {
return nil, dsl.NewBroken(err)
}
opts := KDSOpts{
BufferSize: dsl.DefaultChanBufferSize,
}
if err = json.Unmarshal(js, &opts); err != nil {
return nil, dsl.NewBroken(err)
}
return &KDSPubChan{
c: make(chan dsl.Msg, opts.BufferSize),
ctl: make(chan bool),
opts: &opts,
}, nil
}
func (c *KDSPubChan) Kind() dsl.ChanKind {
return "KDSPUB"
}
func (c *KDSPubChan) Open(ctx *dsl.Ctx) error {
cfg, err := config.LoadDefaultConfig(context.TODO())
if err != nil {
ctx.Logf("Error opening KDS stream %s", c.opts.StreamName)
}
c.svc = kinesis.NewFromConfig(cfg)
go c.Pub(ctx, dsl.Msg{})
return nil
}
func (c *KDSPubChan) Close(ctx *dsl.Ctx) error {
return nil
}
func (c *KDSPubChan) Sub(ctx *dsl.Ctx, topic string) error {
return dsl.Brokenf("Can't Sub on a KDS (%s)", c.opts.StreamName)
}
func (c *KDSPubChan) Pub(ctx *dsl.Ctx, m dsl.Msg) error {
ctx.Logf("Publishing to KDS %s", c.opts.StreamName)
// Load the Shared AWS Configuration (~/.aws/config)
input := &kinesis.PutRecordInput{
Data: []byte(m.Payload),
StreamName: aws.String(c.opts.StreamName),
PartitionKey: aws.String("test"),
}
_, err := c.svc.PutRecord(context.TODO(), input)
if err != nil {
ctx.Warnf("warning: KDSPubChan.PUB %s", err)
}
return nil
}
func (c *KDSPubChan) Recv(ctx *dsl.Ctx) chan dsl.Msg {
ctx.Logf("KDSPubChan Recv()")
return c.c
}
func (c *KDSPubChan) Kill(ctx *dsl.Ctx) error {
return fmt.Errorf("Kill is not supported by a %T", c)
}
func (c *KDSPubChan) To(ctx *dsl.Ctx, m dsl.Msg) error {
ctx.Logf("KDSPubChan To %s", m.Topic)
select {
case <-ctx.Done():
case c.c <- m:
}
return nil
}