mirror of
https://github.com/minio/minio.git
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304 lines
7.5 KiB
Go
304 lines
7.5 KiB
Go
// Copyright 2014 The Prometheus Authors
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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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package expfmt
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import (
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"fmt"
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"io"
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"math"
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"strings"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/model"
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)
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// MetricFamilyToText converts a MetricFamily proto message into text format and
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// writes the resulting lines to 'out'. It returns the number of bytes written
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// and any error encountered. The output will have the same order as the input,
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// no further sorting is performed. Furthermore, this function assumes the input
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// is already sanitized and does not perform any sanity checks. If the input
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// contains duplicate metrics or invalid metric or label names, the conversion
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// will result in invalid text format output.
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//
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// This method fulfills the type 'prometheus.encoder'.
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func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (int, error) {
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var written int
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// Fail-fast checks.
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if len(in.Metric) == 0 {
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return written, fmt.Errorf("MetricFamily has no metrics: %s", in)
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}
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name := in.GetName()
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if name == "" {
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return written, fmt.Errorf("MetricFamily has no name: %s", in)
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}
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// Comments, first HELP, then TYPE.
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if in.Help != nil {
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n, err := fmt.Fprintf(
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out, "# HELP %s %s\n",
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name, escapeString(*in.Help, false),
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)
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written += n
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if err != nil {
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return written, err
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}
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}
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metricType := in.GetType()
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n, err := fmt.Fprintf(
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out, "# TYPE %s %s\n",
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name, strings.ToLower(metricType.String()),
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)
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written += n
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if err != nil {
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return written, err
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}
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// Finally the samples, one line for each.
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for _, metric := range in.Metric {
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switch metricType {
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case dto.MetricType_COUNTER:
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if metric.Counter == nil {
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return written, fmt.Errorf(
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"expected counter in metric %s %s", name, metric,
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)
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}
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n, err = writeSample(
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name, metric, "", "",
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metric.Counter.GetValue(),
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out,
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)
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case dto.MetricType_GAUGE:
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if metric.Gauge == nil {
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return written, fmt.Errorf(
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"expected gauge in metric %s %s", name, metric,
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)
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}
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n, err = writeSample(
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name, metric, "", "",
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metric.Gauge.GetValue(),
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out,
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)
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case dto.MetricType_UNTYPED:
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if metric.Untyped == nil {
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return written, fmt.Errorf(
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"expected untyped in metric %s %s", name, metric,
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)
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}
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n, err = writeSample(
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name, metric, "", "",
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metric.Untyped.GetValue(),
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out,
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)
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case dto.MetricType_SUMMARY:
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if metric.Summary == nil {
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return written, fmt.Errorf(
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"expected summary in metric %s %s", name, metric,
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)
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}
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for _, q := range metric.Summary.Quantile {
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n, err = writeSample(
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name, metric,
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model.QuantileLabel, fmt.Sprint(q.GetQuantile()),
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q.GetValue(),
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out,
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)
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written += n
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if err != nil {
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return written, err
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}
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}
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n, err = writeSample(
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name+"_sum", metric, "", "",
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metric.Summary.GetSampleSum(),
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out,
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)
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if err != nil {
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return written, err
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}
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written += n
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n, err = writeSample(
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name+"_count", metric, "", "",
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float64(metric.Summary.GetSampleCount()),
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out,
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)
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case dto.MetricType_HISTOGRAM:
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if metric.Histogram == nil {
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return written, fmt.Errorf(
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"expected histogram in metric %s %s", name, metric,
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)
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}
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infSeen := false
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for _, q := range metric.Histogram.Bucket {
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n, err = writeSample(
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name+"_bucket", metric,
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model.BucketLabel, fmt.Sprint(q.GetUpperBound()),
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float64(q.GetCumulativeCount()),
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out,
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)
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written += n
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if err != nil {
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return written, err
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}
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if math.IsInf(q.GetUpperBound(), +1) {
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infSeen = true
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}
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}
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if !infSeen {
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n, err = writeSample(
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name+"_bucket", metric,
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model.BucketLabel, "+Inf",
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float64(metric.Histogram.GetSampleCount()),
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out,
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)
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if err != nil {
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return written, err
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}
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written += n
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}
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n, err = writeSample(
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name+"_sum", metric, "", "",
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metric.Histogram.GetSampleSum(),
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out,
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)
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if err != nil {
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return written, err
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}
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written += n
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n, err = writeSample(
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name+"_count", metric, "", "",
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float64(metric.Histogram.GetSampleCount()),
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out,
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)
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default:
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return written, fmt.Errorf(
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"unexpected type in metric %s %s", name, metric,
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)
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}
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written += n
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if err != nil {
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return written, err
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}
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}
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return written, nil
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}
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// writeSample writes a single sample in text format to out, given the metric
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// name, the metric proto message itself, optionally an additional label name
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// and value (use empty strings if not required), and the value. The function
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// returns the number of bytes written and any error encountered.
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func writeSample(
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name string,
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metric *dto.Metric,
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additionalLabelName, additionalLabelValue string,
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value float64,
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out io.Writer,
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) (int, error) {
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var written int
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n, err := fmt.Fprint(out, name)
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written += n
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if err != nil {
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return written, err
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}
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n, err = labelPairsToText(
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metric.Label,
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additionalLabelName, additionalLabelValue,
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out,
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)
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written += n
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if err != nil {
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return written, err
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}
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n, err = fmt.Fprintf(out, " %v", value)
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written += n
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if err != nil {
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return written, err
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}
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if metric.TimestampMs != nil {
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n, err = fmt.Fprintf(out, " %v", *metric.TimestampMs)
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written += n
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if err != nil {
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return written, err
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}
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}
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n, err = out.Write([]byte{'\n'})
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written += n
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if err != nil {
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return written, err
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}
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return written, nil
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}
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// labelPairsToText converts a slice of LabelPair proto messages plus the
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// explicitly given additional label pair into text formatted as required by the
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// text format and writes it to 'out'. An empty slice in combination with an
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// empty string 'additionalLabelName' results in nothing being
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// written. Otherwise, the label pairs are written, escaped as required by the
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// text format, and enclosed in '{...}'. The function returns the number of
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// bytes written and any error encountered.
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func labelPairsToText(
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in []*dto.LabelPair,
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additionalLabelName, additionalLabelValue string,
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out io.Writer,
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) (int, error) {
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if len(in) == 0 && additionalLabelName == "" {
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return 0, nil
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}
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var written int
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separator := '{'
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for _, lp := range in {
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n, err := fmt.Fprintf(
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out, `%c%s="%s"`,
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separator, lp.GetName(), escapeString(lp.GetValue(), true),
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)
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written += n
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if err != nil {
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return written, err
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}
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separator = ','
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}
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if additionalLabelName != "" {
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n, err := fmt.Fprintf(
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out, `%c%s="%s"`,
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separator, additionalLabelName,
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escapeString(additionalLabelValue, true),
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)
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written += n
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if err != nil {
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return written, err
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}
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}
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n, err := out.Write([]byte{'}'})
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written += n
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if err != nil {
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return written, err
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}
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return written, nil
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}
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var (
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escape = strings.NewReplacer("\\", `\\`, "\n", `\n`)
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escapeWithDoubleQuote = strings.NewReplacer("\\", `\\`, "\n", `\n`, "\"", `\"`)
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)
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// escapeString replaces '\' by '\\', new line character by '\n', and - if
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// includeDoubleQuote is true - '"' by '\"'.
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func escapeString(v string, includeDoubleQuote bool) string {
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if includeDoubleQuote {
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return escapeWithDoubleQuote.Replace(v)
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}
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return escape.Replace(v)
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}
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