118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
// Copyright 2016 DigitalOcean
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Command ceph_exporter provides a Prometheus exporter for a Ceph cluster.
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package main
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import (
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"flag"
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"log"
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"net/http"
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"sync"
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"github.com/digitalocean/ceph_exporter/collectors"
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"github.com/ceph/go-ceph/rados"
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"github.com/prometheus/client_golang/prometheus"
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)
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// CephExporter wraps all the ceph collectors and provides a single global
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// exporter to extracts metrics out of. It also ensures that the collection
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// is done in a thread-safe manner, the necessary requirement stated by
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// prometheus. It also implements a prometheus.Collector interface in order
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// to register it correctly.
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type CephExporter struct {
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mu sync.Mutex
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collectors []prometheus.Collector
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}
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// Verify that the exporter implements the interface correctly.
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var _ prometheus.Collector = &CephExporter{}
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// NewCephExporter creates an instance to CephExporter and returns a reference
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// to it. We can choose to enable a collector to extract stats out of by adding
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// it to the list of collectors.
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func NewCephExporter(conn *rados.Conn) *CephExporter {
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return &CephExporter{
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collectors: []prometheus.Collector{
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collectors.NewClusterUsageCollector(conn),
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collectors.NewPoolUsageCollector(conn),
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collectors.NewClusterHealthCollector(conn),
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collectors.NewMonitorCollector(conn),
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collectors.NewDfCollector(conn),
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},
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}
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}
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// Describe sends all the descriptors of the collectors included to
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// the provided channel.
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func (c *CephExporter) Describe(ch chan<- *prometheus.Desc) {
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for _, cc := range c.collectors {
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cc.Describe(ch)
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}
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}
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// Collect sends the collected metrics from each of the collectors to
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// prometheus. Collect could be called several times concurrently
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// and thus its run is protected by a single mutex.
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func (c *CephExporter) Collect(ch chan<- prometheus.Metric) {
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c.mu.Lock()
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defer c.mu.Unlock()
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for _, cc := range c.collectors {
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cc.Collect(ch)
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}
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}
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func main() {
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var (
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addr = flag.String("telemetry.addr", ":9128", "host:port for ceph exporter")
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metricsPath = flag.String("telemetry.path", "/metrics", "URL path for surfacing collected metrics")
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cephConfig = flag.String("ceph.config", "", "path to ceph config file")
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)
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flag.Parse()
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conn, err := rados.NewConn()
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if err != nil {
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log.Fatalf("cannot create new ceph connection: %s", err)
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}
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if *cephConfig != "" {
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err = conn.ReadConfigFile(*cephConfig)
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} else {
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err = conn.ReadDefaultConfigFile()
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}
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if err != nil {
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log.Fatalf("cannot read ceph config file: %s", err)
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}
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if err := conn.Connect(); err != nil {
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log.Fatalf("cannot connect to ceph cluster: %s", err)
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}
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defer conn.Shutdown()
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prometheus.MustRegister(NewCephExporter(conn))
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http.Handle(*metricsPath, prometheus.Handler())
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r, *metricsPath, http.StatusMovedPermanently)
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})
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log.Printf("Starting ceph exporter on %q", *addr)
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if err := http.ListenAndServe(*addr, nil); err != nil {
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log.Fatalf("cannot start ceph exporter: %s", err)
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}
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}
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