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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,72 @@ | ||
| // Copyright 2015 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 collectors | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/sapcc/go-bits/logg" | ||
| ) | ||
|
|
||
| type typedDesc struct { | ||
| desc *prometheus.Desc | ||
| valueType prometheus.ValueType | ||
| } | ||
|
|
||
| func (d *typedDesc) mustNewConstMetric(value float64, labels ...string) prometheus.Metric { | ||
| return prometheus.MustNewConstMetric(d.desc, d.valueType, value, labels...) | ||
| } | ||
|
|
||
| func (d *typedDesc) describe(ch chan<- *prometheus.Desc) { | ||
| ch <- d.desc | ||
| } | ||
|
|
||
| // collectorTask is the interface that a specific collector task must implement. | ||
| type collectorTask interface { | ||
| describeMetrics(chan<- *prometheus.Desc) | ||
| collectMetrics(chan<- prometheus.Metric) error | ||
| } | ||
|
|
||
| // executeTask runs the metric collection for a specific collector task, | ||
| // and updates the respective exit code metric. | ||
| func executeTask(collectorName, taskName string, task collectorTask, ch chan<- prometheus.Metric, exitCodeTypedDesc typedDesc) { | ||
| exitCode := 0 | ||
| failedQuery := "" | ||
|
|
||
| err := task.collectMetrics(ch) | ||
| if err != nil { | ||
| exitCode = 1 | ||
| logg.Error("swift %s collector: %s: %s", collectorName, taskName, err.Error()) | ||
| if e, ok := err.(*taskCollectionError); ok { | ||
| failedQuery = strings.Join(e.cmdArgs, " ") | ||
| } | ||
| } | ||
|
|
||
| ch <- exitCodeTypedDesc.mustNewConstMetric(float64(exitCode), taskName, failedQuery) | ||
| } | ||
|
|
||
| // taskCollectionError is a custom error type that a task.collectMetrics() can | ||
| // return in order to provide context about the specific command arguments | ||
| // that were used during that collection. | ||
| type taskCollectionError struct { | ||
| // we are only interested in the arguments, not the command itself | ||
| cmdArgs []string | ||
| inner error | ||
| } | ||
|
|
||
| func (e *taskCollectionError) Error() string { | ||
| return fmt.Sprintf("%s: %s", strings.Join(e.cmdArgs, " "), e.inner.Error()) | ||
| } |
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