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producer.go
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producer.go
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package amqp
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"strconv"
"time"
"github.com/streadway/amqp"
"github.com/luraproject/lura/v2/config"
"github.com/luraproject/lura/v2/proxy"
)
const producerNamespace = "github.com/devopsfaith/krakend-amqp/produce"
var errNoProducerCfgDefined = errors.New("no amqp producer defined")
func getProducerConfig(remote *config.Backend) (*producerCfg, error) {
v, ok := remote.ExtraConfig[producerNamespace]
if !ok {
return nil, errNoProducerCfgDefined
}
b, _ := json.Marshal(v)
cfg := &producerCfg{}
err := json.Unmarshal(b, cfg)
return cfg, err
}
type producerCfg struct {
queueCfg
Mandatory bool `json:"mandatory"`
Immediate bool `json:"immediate"`
ExpirationKey string `json:"exp_key"`
ReplyToKey string `json:"reply_to_key"`
MessageIdKey string `json:"msg_id_key"`
PriorityKey string `json:"priority_key"`
RoutingKey string `json:"routing_key"`
}
func (f backendFactory) initProducer(ctx context.Context, remote *config.Backend) (proxy.Proxy, error) {
if len(remote.Host) < 1 {
return proxy.NoopProxy, errNoBackendHostDefined
}
dns := remote.Host[0]
logPrefix := "[BACKEND: " + remote.URLPattern + "][AMQP]"
cfg, err := getProducerConfig(remote)
if err != nil {
if err != errNoProducerCfgDefined {
f.logger.Debug(logPrefix, fmt.Sprintf("%s: %s", dns, err.Error()))
}
return proxy.NoopProxy, err
}
ch, closeF, err := f.newChannel(dns)
if err != nil {
f.logger.Error(logPrefix, fmt.Sprintf("Error getting the channel for %s/%s: %s", dns, cfg.Name, err.Error()))
return proxy.NoopProxy, err
}
err = ch.ExchangeDeclare(
cfg.Exchange, // name
"topic", // type
cfg.Durable,
cfg.Delete,
cfg.Exclusive,
cfg.NoWait,
nil,
)
if err != nil {
f.logger.Error(logPrefix, fmt.Sprintf("Error declaring the exchange for %s/%s: %s", dns, cfg.Name, err.Error()))
closeF()
return proxy.NoopProxy, err
}
go func() {
<-ctx.Done()
closeF()
}()
f.logger.Debug(logPrefix, "Producer attached")
return func(ctx context.Context, r *proxy.Request) (*proxy.Response, error) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
return nil, err
}
contentType := ""
headers := amqp.Table{}
for k, vs := range r.Headers {
headerValues := make([]interface{}, len(vs))
for k, v := range vs {
headerValues[k] = v
}
headers[k] = headerValues
}
pub := amqp.Publishing{
Headers: headers,
ContentType: contentType,
Body: body,
Timestamp: time.Now(),
Expiration: r.Params[cfg.ExpirationKey],
ReplyTo: r.Params[cfg.ReplyToKey],
MessageId: r.Params[cfg.MessageIdKey],
}
if len(r.Headers["Content-Type"]) > 0 {
pub.ContentType = r.Headers["Content-Type"][0]
}
if v, ok := r.Params[cfg.PriorityKey]; ok {
if i, err := strconv.Atoi(v); err == nil {
pub.Priority = uint8(i)
}
}
err = ch.Publish(
cfg.Exchange,
r.Params[cfg.RoutingKey],
cfg.Mandatory,
cfg.Immediate,
pub,
)
if err != nil {
return nil, err
}
return &proxy.Response{IsComplete: true}, nil
}, nil
}