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client.go
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client.go
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// Copyright 2015-2018 trivago N.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.
// +build cgo,!unit
package librdkafka
// #cgo CFLAGS: -I/usr/local/include -std=c99 -Wno-deprecated-declarations
// #cgo LDFLAGS: -L/usr/local/lib -L/usr/local/opt/librdkafka/lib -lrdkafka
// #include "wrapper.h"
import "C"
import (
"sync"
"time"
)
// Client is a wrapper handle for rd_kafka_t
type Client struct {
handle *C.rd_kafka_t
}
var (
clientGuard = new(sync.RWMutex)
clients = make(map[*C.rd_kafka_t]MessageDelivery)
)
// NewProducer creates a new librdkafka client in producer mode.
// Make sure to call Close() when done.
func NewProducer(config Config, handler MessageDelivery) (*Client, error) {
client := Client{}
nativeErr := new(ErrorHandle)
C.RegisterErrorWrapper(config.handle)
C.RegisterDeliveryReportWrapper(config.handle)
client.handle = C.rd_kafka_new(C.RD_KAFKA_PRODUCER, config.handle, nativeErr.buffer(), nativeErr.len())
if client.handle == nil {
return nil, nativeErr
}
if handler != nil {
clientGuard.Lock()
clients[client.handle] = handler
clientGuard.Unlock()
}
return &client, nil
}
// Poll polls for new data to be sent to the async handler functions
func (cl *Client) Poll(timeout time.Duration) {
if timeout < 0 {
C.rd_kafka_poll(cl.handle, -1)
} else {
timeoutMs := C.int(timeout.Nanoseconds() / 1000000)
C.rd_kafka_poll(cl.handle, timeoutMs)
}
}
// Close frees the native handle.
func (cl *Client) Close() {
C.rd_kafka_destroy(cl.handle)
}
// GetAllocCounter returns the number of allocated native buffers
func (cl *Client) GetAllocCounter() int64 {
return int64(C.GetAllocCounter())
}