diff options
Diffstat (limited to 'vendor/github.com/prometheus/client_golang/prometheus/graphite/bridge.go')
| -rw-r--r-- | vendor/github.com/prometheus/client_golang/prometheus/graphite/bridge.go | 280 |
1 files changed, 0 insertions, 280 deletions
diff --git a/vendor/github.com/prometheus/client_golang/prometheus/graphite/bridge.go b/vendor/github.com/prometheus/client_golang/prometheus/graphite/bridge.go deleted file mode 100644 index 11533374b..000000000 --- a/vendor/github.com/prometheus/client_golang/prometheus/graphite/bridge.go +++ /dev/null @@ -1,280 +0,0 @@ -// Copyright 2016 The Prometheus Authors -// 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. - -// Package graphite provides a bridge to push Prometheus metrics to a Graphite -// server. -package graphite - -import ( - "bufio" - "errors" - "fmt" - "io" - "net" - "sort" - "time" - - "github.com/prometheus/common/expfmt" - "github.com/prometheus/common/model" - "golang.org/x/net/context" - - dto "github.com/prometheus/client_model/go" - - "github.com/prometheus/client_golang/prometheus" -) - -const ( - defaultInterval = 15 * time.Second - millisecondsPerSecond = 1000 -) - -// HandlerErrorHandling defines how a Handler serving metrics will handle -// errors. -type HandlerErrorHandling int - -// These constants cause handlers serving metrics to behave as described if -// errors are encountered. -const ( - // Ignore errors and try to push as many metrics to Graphite as possible. - ContinueOnError HandlerErrorHandling = iota - - // Abort the push to Graphite upon the first error encountered. - AbortOnError -) - -// Config defines the Graphite bridge config. -type Config struct { - // The url to push data to. Required. - URL string - - // The prefix for the pushed Graphite metrics. Defaults to empty string. - Prefix string - - // The interval to use for pushing data to Graphite. Defaults to 15 seconds. - Interval time.Duration - - // The timeout for pushing metrics to Graphite. Defaults to 15 seconds. - Timeout time.Duration - - // The Gatherer to use for metrics. Defaults to prometheus.DefaultGatherer. - Gatherer prometheus.Gatherer - - // The logger that messages are written to. Defaults to no logging. - Logger Logger - - // ErrorHandling defines how errors are handled. Note that errors are - // logged regardless of the configured ErrorHandling provided Logger - // is not nil. - ErrorHandling HandlerErrorHandling -} - -// Bridge pushes metrics to the configured Graphite server. -type Bridge struct { - url string - prefix string - interval time.Duration - timeout time.Duration - - errorHandling HandlerErrorHandling - logger Logger - - g prometheus.Gatherer -} - -// Logger is the minimal interface Bridge needs for logging. Note that -// log.Logger from the standard library implements this interface, and it is -// easy to implement by custom loggers, if they don't do so already anyway. -type Logger interface { - Println(v ...interface{}) -} - -// NewBridge returns a pointer to a new Bridge struct. -func NewBridge(c *Config) (*Bridge, error) { - b := &Bridge{} - - if c.URL == "" { - return nil, errors.New("missing URL") - } - b.url = c.URL - - if c.Gatherer == nil { - b.g = prometheus.DefaultGatherer - } else { - b.g = c.Gatherer - } - - if c.Logger != nil { - b.logger = c.Logger - } - - if c.Prefix != "" { - b.prefix = c.Prefix - } - - var z time.Duration - if c.Interval == z { - b.interval = defaultInterval - } else { - b.interval = c.Interval - } - - if c.Timeout == z { - b.timeout = defaultInterval - } else { - b.timeout = c.Timeout - } - - b.errorHandling = c.ErrorHandling - - return b, nil -} - -// Run starts the event loop that pushes Prometheus metrics to Graphite at the -// configured interval. -func (b *Bridge) Run(ctx context.Context) { - ticker := time.NewTicker(b.interval) - defer ticker.Stop() - for { - select { - case <-ticker.C: - if err := b.Push(); err != nil && b.logger != nil { - b.logger.Println("error pushing to Graphite:", err) - } - case <-ctx.Done(): - return - } - } -} - -// Push pushes Prometheus metrics to the configured Graphite server. -func (b *Bridge) Push() error { - mfs, err := b.g.Gather() - if err != nil || len(mfs) == 0 { - switch b.errorHandling { - case AbortOnError: - return err - case ContinueOnError: - if b.logger != nil { - b.logger.Println("continue on error:", err) - } - default: - panic("unrecognized error handling value") - } - } - - conn, err := net.DialTimeout("tcp", b.url, b.timeout) - if err != nil { - return err - } - defer conn.Close() - - return writeMetrics(conn, mfs, b.prefix, model.Now()) -} - -func writeMetrics(w io.Writer, mfs []*dto.MetricFamily, prefix string, now model.Time) error { - vec, err := expfmt.ExtractSamples(&expfmt.DecodeOptions{ - Timestamp: now, - }, mfs...) - if err != nil { - return err - } - - buf := bufio.NewWriter(w) - for _, s := range vec { - if err := writeSanitized(buf, prefix); err != nil { - return err - } - if err := buf.WriteByte('.'); err != nil { - return err - } - if err := writeMetric(buf, s.Metric); err != nil { - return err - } - if _, err := fmt.Fprintf(buf, " %g %d\n", s.Value, int64(s.Timestamp)/millisecondsPerSecond); err != nil { - return err - } - if err := buf.Flush(); err != nil { - return err - } - } - - return nil -} - -func writeMetric(buf *bufio.Writer, m model.Metric) error { - metricName, hasName := m[model.MetricNameLabel] - numLabels := len(m) - 1 - if !hasName { - numLabels = len(m) - } - - labelStrings := make([]string, 0, numLabels) - for label, value := range m { - if label != model.MetricNameLabel { - labelStrings = append(labelStrings, fmt.Sprintf("%s %s", string(label), string(value))) - } - } - - var err error - switch numLabels { - case 0: - if hasName { - return writeSanitized(buf, string(metricName)) - } - default: - sort.Strings(labelStrings) - if err = writeSanitized(buf, string(metricName)); err != nil { - return err - } - for _, s := range labelStrings { - if err = buf.WriteByte('.'); err != nil { - return err - } - if err = writeSanitized(buf, s); err != nil { - return err - } - } - } - return nil -} - -func writeSanitized(buf *bufio.Writer, s string) error { - prevUnderscore := false - - for _, c := range s { - c = replaceInvalidRune(c) - if c == '_' { - if prevUnderscore { - continue - } - prevUnderscore = true - } else { - prevUnderscore = false - } - if _, err := buf.WriteRune(c); err != nil { - return err - } - } - - return nil -} - -func replaceInvalidRune(c rune) rune { - if c == ' ' { - return '.' - } - if !((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || c == ':' || (c >= '0' && c <= '9')) { - return '_' - } - return c -} |