/
carrier.go
98 lines (85 loc) · 2.58 KB
/
carrier.go
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package trace
import (
"github.com/Shopify/sarama"
"go.opentelemetry.io/otel/propagation"
)
var _ propagation.TextMapCarrier = (*ProducerMessageCarrier)(nil)
var _ propagation.TextMapCarrier = (*ConsumerMessageCarrier)(nil)
// ProducerMessageCarrier injects and extracts traces from a sarama.ProducerMessage.
type ProducerMessageCarrier struct {
msg *sarama.ProducerMessage
}
// NewProducerMessageCarrier creates a new ProducerMessageCarrier.
func NewProducerMessageCarrier(msg *sarama.ProducerMessage) ProducerMessageCarrier {
return ProducerMessageCarrier{msg: msg}
}
// Get retrieves a single value for a given key.
func (c ProducerMessageCarrier) Get(key string) string {
for _, h := range c.msg.Headers {
if string(h.Key) == key {
return string(h.Value)
}
}
return ""
}
// Set sets a header.
func (c ProducerMessageCarrier) Set(key, val string) {
// Ensure uniqueness of keys
for i := 0; i < len(c.msg.Headers); i++ {
if string(c.msg.Headers[i].Key) == key {
c.msg.Headers = append(c.msg.Headers[:i], c.msg.Headers[i+1:]...)
i--
}
}
c.msg.Headers = append(c.msg.Headers, sarama.RecordHeader{
Key: []byte(key),
Value: []byte(val),
})
}
// Keys returns a slice of all key identifiers in the carrier.
func (c ProducerMessageCarrier) Keys() []string {
out := make([]string, len(c.msg.Headers))
for i, h := range c.msg.Headers {
out[i] = string(h.Key)
}
return out
}
// ConsumerMessageCarrier injects and extracts traces from a sarama.ConsumerMessage.
type ConsumerMessageCarrier struct {
msg *sarama.ConsumerMessage
}
// NewConsumerMessageCarrier creates a new ConsumerMessageCarrier.
func NewConsumerMessageCarrier(msg *sarama.ConsumerMessage) ConsumerMessageCarrier {
return ConsumerMessageCarrier{msg: msg}
}
// Get retrieves a single value for a given key.
func (c ConsumerMessageCarrier) Get(key string) string {
for _, h := range c.msg.Headers {
if h != nil && string(h.Key) == key {
return string(h.Value)
}
}
return ""
}
// Set sets a header.
func (c ConsumerMessageCarrier) Set(key, val string) {
// Ensure uniqueness of keys
for i := 0; i < len(c.msg.Headers); i++ {
if c.msg.Headers[i] != nil && string(c.msg.Headers[i].Key) == key {
c.msg.Headers = append(c.msg.Headers[:i], c.msg.Headers[i+1:]...)
i--
}
}
c.msg.Headers = append(c.msg.Headers, &sarama.RecordHeader{
Key: []byte(key),
Value: []byte(val),
})
}
// Keys returns a slice of all key identifiers in the carrier.
func (c ConsumerMessageCarrier) Keys() []string {
out := make([]string, len(c.msg.Headers))
for i, h := range c.msg.Headers {
out[i] = string(h.Key)
}
return out
}