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main.go
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main.go
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package main
import (
"io/ioutil"
"net/http"
"os"
"strings"
"sync"
"time"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/version"
"github.com/prometheus/exporter-toolkit/web"
"github.com/prometheus/exporter-toolkit/web/kingpinflag"
"gopkg.in/alecthomas/kingpin.v2"
"gopkg.in/yaml.v2"
)
var (
// queryTimeout = kingpin.Flag("query.timeout", "Query timeout (in seconds). (env: QUERY_TIMEOUT)").Default(getEnv("QUERY_TIMEOUT", "5")).String()
metricPath = kingpin.Flag(
"web.telemetry-path",
"Path under which to expose metrics.",
).Default("/metrics").String()
metricFile = kingpin.Flag(
"file.metrics",
"File with default metrics in a yaml file. (env: FILE_METRICS)",
).Default("").String()
multidatabaseAddr = kingpin.Flag(
"mdb.addr",
"multidatabase address",
).Default("").String()
toolkitFlags = kingpinflag.AddFlags(kingpin.CommandLine, ":9521")
)
// Metric name parts.
const (
namespace = "oracle"
exporter = "exporter"
)
// global variables
var (
metricsToScrap Metrics
)
// Metrics object description
type Metric struct {
Name string
Context string
Labels []string
MetricsDesc map[string]string
MetricsType map[string]string
MetricsBuckets map[string]map[string]string
FieldToAppend string
Request string
IgnoreZeroResult bool
}
// Used to load multiple metrics from file
type Metrics struct {
Metric []Metric
}
// Exporter collects Oracle DB metrics. It implements prometheus.Collector.
type Exporter struct {
logger log.Logger
md MultiDatabase
mp MetricProcessor
collects []string
Duration, Error prometheus.Gauge
TotalScrapes prometheus.Counter
ScrapeErrors *prometheus.CounterVec
OracleUp prometheus.Gauge
}
// NewExporter returns a new Oracle DB exporter for the provided DSN.
func NewExporter(dsn string, collects []string, logger log.Logger) *Exporter {
return &Exporter{
logger: logger,
md: MultiDatabase{addr: *multidatabaseAddr, dsn: dsn},
collects: collects,
mp: MetricProcessor{logger: logger},
Duration: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: exporter,
Name: "last_scrape_duration_seconds",
Help: "Duration of the last scrape of metrics from Oracle DB.",
}),
TotalScrapes: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: exporter,
Name: "scrapes_total",
Help: "Total number of times Oracle DB was scraped for metrics.",
}),
ScrapeErrors: prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: exporter,
Name: "scrape_errors_total",
Help: "Total number of times an error occured scraping a Oracle database.",
}, []string{"collector"}),
Error: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: exporter,
Name: "last_scrape_error",
Help: "Whether the last scrape of metrics from Oracle DB resulted in an error (1 for error, 0 for success).",
}),
OracleUp: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Name: "up",
Help: "Whether the Oracle database server is up.",
}),
}
}
// Collect implements prometheus.Collector.
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- e.TotalScrapes.Desc()
ch <- e.Error.Desc()
e.ScrapeErrors.Describe(ch)
ch <- e.OracleUp.Desc()
}
// Collect implements prometheus.Collector.
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
e.scrape(ch)
ch <- e.TotalScrapes
ch <- e.Error
e.ScrapeErrors.Collect(ch)
ch <- e.OracleUp
}
func (e *Exporter) scrape(ch chan<- prometheus.Metric) {
e.TotalScrapes.Inc()
var err error
defer func(begun time.Time) {
e.Duration.Set(time.Since(begun).Seconds())
if err == nil {
e.Error.Set(0)
return
}
e.Error.Set(1)
}(time.Now())
if err = e.md.Ping(); err != nil {
e.OracleUp.Set(0)
level.Error(e.logger).Log("Error pinging oracle", err)
return
}
e.OracleUp.Set(1)
e.Error.Set(1)
// resolveMetricFile()
wg := sync.WaitGroup{}
defer wg.Wait()
for _, metric := range metricsToScrap.Metric {
if !filterMetric(e.collects, metric.Name) {
continue
}
level.Debug(e.logger).Log("msg", "scrap detail", "dsn", e.md.dsn, "metric", metric.Name, "metric context", metric.Context)
wg.Add(1)
metric := metric //https://golang.org/doc/faq#closures_and_goroutines
go func() {
defer wg.Done()
level.Debug(e.logger).Log("About to scrape metric: ")
level.Debug(e.logger).Log("- Metric MetricsDesc: ", metric.MetricsDesc)
level.Debug(e.logger).Log("- Metric Name: ", metric.Name)
level.Debug(e.logger).Log("- Metric Context: ", metric.Context)
level.Debug(e.logger).Log("- Metric MetricsType: ", metric.MetricsType)
level.Debug(e.logger).Log("- Metric MetricsBuckets: ", metric.MetricsBuckets, "(Ignored unless Histogram type)")
level.Debug(e.logger).Log("- Metric Labels: ", metric.Labels)
level.Debug(e.logger).Log("- Metric FieldToAppend: ", metric.FieldToAppend)
level.Debug(e.logger).Log("- Metric IgnoreZeroResult: ", metric.IgnoreZeroResult)
level.Debug(e.logger).Log("- Metric Request: ", metric.Request)
if len(metric.Request) == 0 {
level.Error(e.logger).Log("Error scraping for ", metric.MetricsDesc, ". Did you forget to define request in your toml file?")
return
}
if len(metric.MetricsDesc) == 0 {
level.Error(e.logger).Log("Error scraping for query", metric.Request, ". Did you forget to define metricsdesc in your toml file?")
return
}
for column, metricType := range metric.MetricsType {
if metricType == "histogram" {
_, ok := metric.MetricsBuckets[column]
if !ok {
level.Error(e.logger).Log("Unable to find MetricsBuckets configuration key for metric. (metric=" + column + ")")
return
}
}
}
scrapeStart := time.Now()
if err = e.mp.ScrapeMetric(ch, e.md, metric); err != nil {
level.Error(e.logger).Log("msg", "Error Scrape", "dsn", e.md.dsn, "metric", metric.Name, "context", metric.Context, "err", err)
e.ScrapeErrors.WithLabelValues(metric.Context).Inc()
} else {
level.Debug(e.logger).Log("Successfully scraped metric: ", metric.Context, metric.MetricsDesc, time.Since(scrapeStart))
}
}()
}
}
func resolveMetrics(metricsPath string, logger log.Logger) error {
var metricsBytes []byte
var err error
if strings.HasPrefix(metricsPath, "http://") || strings.HasPrefix(metricsPath, "https://") {
var resp *http.Response
resp, err = http.Get(metricsPath)
if err != nil {
return err
}
defer resp.Body.Close()
if body, err := ioutil.ReadAll(resp.Body); err != nil {
return err
} else {
metricsBytes = body
}
} else {
var err error
metricsBytes, err = ioutil.ReadFile(metricsPath)
if err != nil {
return err
}
}
metricsToScrap.Metric = []Metric{}
// Load default metrics
err = yaml.Unmarshal(metricsBytes, &metricsToScrap.Metric)
return err
}
func filterMetric(slice []string, val string) bool {
for _, item := range slice {
if item == val {
return true
}
}
return false
}
func init() {
prometheus.MustRegister(version.NewCollector("oracle_exporter"))
}
func newHandler(logger log.Logger) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
param_collects := r.URL.Query()["collect[]"]
param_dsn := r.URL.Query()["dsn"]
if len(param_dsn) != 1 || len(param_collects) == 0 {
// level.Warn(h.logger).Log("msg", "Couldn't create filtered metrics handler:", "err", err)
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Parameters are not set correctly."))
return
}
registry := prometheus.NewRegistry()
registry.MustRegister(NewExporter(param_dsn[0], param_collects, logger))
gatherers := prometheus.Gatherers{
prometheus.DefaultGatherer,
registry,
}
handler := promhttp.HandlerFor(gatherers, promhttp.HandlerOpts{})
handler.ServeHTTP(w, r)
}
}
func main() {
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.Version(version.Print("oracle_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(promlogConfig)
level.Info(logger).Log("msg", "Starting oracledb_exporter", "version", version.Info())
level.Info(logger).Log("msg", "Build context", "build_context", version.BuildContext())
if err := resolveMetrics(*metricFile, logger); err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
// http.Handle(*metricsPath, newHandler(*maxRequests, logger))
handlerFunc := newHandler(logger)
http.Handle(*metricPath, promhttp.InstrumentMetricHandler(prometheus.DefaultRegisterer, handlerFunc))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Oracle Database Exporter ` + version.Version + `</title></head>
<body>
<h1>Oracle Database Exporter ` + version.Version + `</h1>
<p><a href="` + *metricPath + `">Metrics</a></p>
</body>
</html>`))
})
http.HandleFunc("/check", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(200)
})
server := &http.Server{}
if err := web.ListenAndServe(server, toolkitFlags, logger); err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
}