diff options
Diffstat (limited to 'vendor/github.com/prometheus/client_golang/prometheus/process_collector.go')
-rw-r--r-- | vendor/github.com/prometheus/client_golang/prometheus/process_collector.go | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/vendor/github.com/prometheus/client_golang/prometheus/process_collector.go b/vendor/github.com/prometheus/client_golang/prometheus/process_collector.go new file mode 100644 index 000000000..e31e62e78 --- /dev/null +++ b/vendor/github.com/prometheus/client_golang/prometheus/process_collector.go @@ -0,0 +1,142 @@ +// 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 prometheus + +import "github.com/prometheus/procfs" + +type processCollector struct { + pid int + collectFn func(chan<- Metric) + pidFn func() (int, error) + cpuTotal Counter + openFDs, maxFDs Gauge + vsize, rss Gauge + startTime Gauge +} + +// NewProcessCollector returns a collector which exports the current state of +// process metrics including cpu, memory and file descriptor usage as well as +// the process start time for the given process id under the given namespace. +func NewProcessCollector(pid int, namespace string) Collector { + return NewProcessCollectorPIDFn( + func() (int, error) { return pid, nil }, + namespace, + ) +} + +// NewProcessCollectorPIDFn returns a collector which exports the current state +// of process metrics including cpu, memory and file descriptor usage as well +// as the process start time under the given namespace. The given pidFn is +// called on each collect and is used to determine the process to export +// metrics for. +func NewProcessCollectorPIDFn( + pidFn func() (int, error), + namespace string, +) Collector { + c := processCollector{ + pidFn: pidFn, + collectFn: func(chan<- Metric) {}, + + cpuTotal: NewCounter(CounterOpts{ + Namespace: namespace, + Name: "process_cpu_seconds_total", + Help: "Total user and system CPU time spent in seconds.", + }), + openFDs: NewGauge(GaugeOpts{ + Namespace: namespace, + Name: "process_open_fds", + Help: "Number of open file descriptors.", + }), + maxFDs: NewGauge(GaugeOpts{ + Namespace: namespace, + Name: "process_max_fds", + Help: "Maximum number of open file descriptors.", + }), + vsize: NewGauge(GaugeOpts{ + Namespace: namespace, + Name: "process_virtual_memory_bytes", + Help: "Virtual memory size in bytes.", + }), + rss: NewGauge(GaugeOpts{ + Namespace: namespace, + Name: "process_resident_memory_bytes", + Help: "Resident memory size in bytes.", + }), + startTime: NewGauge(GaugeOpts{ + Namespace: namespace, + Name: "process_start_time_seconds", + Help: "Start time of the process since unix epoch in seconds.", + }), + } + + // Set up process metric collection if supported by the runtime. + if _, err := procfs.NewStat(); err == nil { + c.collectFn = c.processCollect + } + + return &c +} + +// Describe returns all descriptions of the collector. +func (c *processCollector) Describe(ch chan<- *Desc) { + ch <- c.cpuTotal.Desc() + ch <- c.openFDs.Desc() + ch <- c.maxFDs.Desc() + ch <- c.vsize.Desc() + ch <- c.rss.Desc() + ch <- c.startTime.Desc() +} + +// Collect returns the current state of all metrics of the collector. +func (c *processCollector) Collect(ch chan<- Metric) { + c.collectFn(ch) +} + +// TODO(ts): Bring back error reporting by reverting 7faf9e7 as soon as the +// client allows users to configure the error behavior. +func (c *processCollector) processCollect(ch chan<- Metric) { + pid, err := c.pidFn() + if err != nil { + return + } + + p, err := procfs.NewProc(pid) + if err != nil { + return + } + + if stat, err := p.NewStat(); err == nil { + c.cpuTotal.Set(stat.CPUTime()) + ch <- c.cpuTotal + c.vsize.Set(float64(stat.VirtualMemory())) + ch <- c.vsize + c.rss.Set(float64(stat.ResidentMemory())) + ch <- c.rss + + if startTime, err := stat.StartTime(); err == nil { + c.startTime.Set(startTime) + ch <- c.startTime + } + } + + if fds, err := p.FileDescriptorsLen(); err == nil { + c.openFDs.Set(float64(fds)) + ch <- c.openFDs + } + + if limits, err := p.NewLimits(); err == nil { + c.maxFDs.Set(float64(limits.OpenFiles)) + ch <- c.maxFDs + } +} |