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container_stats.go
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package docker
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"time"
)
// Stats represents container statistics, returned by /containers/<id>/stats.
//
// See https://goo.gl/Dk3Xio for more details.
type Stats struct {
Read time.Time `json:"read,omitempty" yaml:"read,omitempty" toml:"read,omitempty"`
PreRead time.Time `json:"preread,omitempty" yaml:"preread,omitempty" toml:"preread,omitempty"`
NumProcs uint32 `json:"num_procs" yaml:"num_procs" toml:"num_procs"`
PidsStats struct {
Current uint64 `json:"current,omitempty" yaml:"current,omitempty"`
} `json:"pids_stats,omitempty" yaml:"pids_stats,omitempty" toml:"pids_stats,omitempty"`
Network NetworkStats `json:"network,omitempty" yaml:"network,omitempty" toml:"network,omitempty"`
Networks map[string]NetworkStats `json:"networks,omitempty" yaml:"networks,omitempty" toml:"networks,omitempty"`
MemoryStats struct {
Stats struct {
TotalPgmafault uint64 `json:"total_pgmafault,omitempty" yaml:"total_pgmafault,omitempty" toml:"total_pgmafault,omitempty"`
Cache uint64 `json:"cache,omitempty" yaml:"cache,omitempty" toml:"cache,omitempty"`
MappedFile uint64 `json:"mapped_file,omitempty" yaml:"mapped_file,omitempty" toml:"mapped_file,omitempty"`
TotalInactiveFile uint64 `json:"total_inactive_file,omitempty" yaml:"total_inactive_file,omitempty" toml:"total_inactive_file,omitempty"`
Pgpgout uint64 `json:"pgpgout,omitempty" yaml:"pgpgout,omitempty" toml:"pgpgout,omitempty"`
Rss uint64 `json:"rss,omitempty" yaml:"rss,omitempty" toml:"rss,omitempty"`
TotalMappedFile uint64 `json:"total_mapped_file,omitempty" yaml:"total_mapped_file,omitempty" toml:"total_mapped_file,omitempty"`
Writeback uint64 `json:"writeback,omitempty" yaml:"writeback,omitempty" toml:"writeback,omitempty"`
Unevictable uint64 `json:"unevictable,omitempty" yaml:"unevictable,omitempty" toml:"unevictable,omitempty"`
Pgpgin uint64 `json:"pgpgin,omitempty" yaml:"pgpgin,omitempty" toml:"pgpgin,omitempty"`
TotalUnevictable uint64 `json:"total_unevictable,omitempty" yaml:"total_unevictable,omitempty" toml:"total_unevictable,omitempty"`
Pgmajfault uint64 `json:"pgmajfault,omitempty" yaml:"pgmajfault,omitempty" toml:"pgmajfault,omitempty"`
TotalRss uint64 `json:"total_rss,omitempty" yaml:"total_rss,omitempty" toml:"total_rss,omitempty"`
TotalRssHuge uint64 `json:"total_rss_huge,omitempty" yaml:"total_rss_huge,omitempty" toml:"total_rss_huge,omitempty"`
TotalWriteback uint64 `json:"total_writeback,omitempty" yaml:"total_writeback,omitempty" toml:"total_writeback,omitempty"`
TotalInactiveAnon uint64 `json:"total_inactive_anon,omitempty" yaml:"total_inactive_anon,omitempty" toml:"total_inactive_anon,omitempty"`
RssHuge uint64 `json:"rss_huge,omitempty" yaml:"rss_huge,omitempty" toml:"rss_huge,omitempty"`
HierarchicalMemoryLimit uint64 `json:"hierarchical_memory_limit,omitempty" yaml:"hierarchical_memory_limit,omitempty" toml:"hierarchical_memory_limit,omitempty"`
TotalPgfault uint64 `json:"total_pgfault,omitempty" yaml:"total_pgfault,omitempty" toml:"total_pgfault,omitempty"`
TotalActiveFile uint64 `json:"total_active_file,omitempty" yaml:"total_active_file,omitempty" toml:"total_active_file,omitempty"`
ActiveAnon uint64 `json:"active_anon,omitempty" yaml:"active_anon,omitempty" toml:"active_anon,omitempty"`
TotalActiveAnon uint64 `json:"total_active_anon,omitempty" yaml:"total_active_anon,omitempty" toml:"total_active_anon,omitempty"`
TotalPgpgout uint64 `json:"total_pgpgout,omitempty" yaml:"total_pgpgout,omitempty" toml:"total_pgpgout,omitempty"`
TotalCache uint64 `json:"total_cache,omitempty" yaml:"total_cache,omitempty" toml:"total_cache,omitempty"`
InactiveAnon uint64 `json:"inactive_anon,omitempty" yaml:"inactive_anon,omitempty" toml:"inactive_anon,omitempty"`
ActiveFile uint64 `json:"active_file,omitempty" yaml:"active_file,omitempty" toml:"active_file,omitempty"`
Pgfault uint64 `json:"pgfault,omitempty" yaml:"pgfault,omitempty" toml:"pgfault,omitempty"`
InactiveFile uint64 `json:"inactive_file,omitempty" yaml:"inactive_file,omitempty" toml:"inactive_file,omitempty"`
TotalPgpgin uint64 `json:"total_pgpgin,omitempty" yaml:"total_pgpgin,omitempty" toml:"total_pgpgin,omitempty"`
HierarchicalMemswLimit uint64 `json:"hierarchical_memsw_limit,omitempty" yaml:"hierarchical_memsw_limit,omitempty" toml:"hierarchical_memsw_limit,omitempty"`
Swap uint64 `json:"swap,omitempty" yaml:"swap,omitempty" toml:"swap,omitempty"`
} `json:"stats,omitempty" yaml:"stats,omitempty" toml:"stats,omitempty"`
MaxUsage uint64 `json:"max_usage,omitempty" yaml:"max_usage,omitempty" toml:"max_usage,omitempty"`
Usage uint64 `json:"usage,omitempty" yaml:"usage,omitempty" toml:"usage,omitempty"`
Failcnt uint64 `json:"failcnt,omitempty" yaml:"failcnt,omitempty" toml:"failcnt,omitempty"`
Limit uint64 `json:"limit,omitempty" yaml:"limit,omitempty" toml:"limit,omitempty"`
Commit uint64 `json:"commitbytes,omitempty" yaml:"commitbytes,omitempty" toml:"privateworkingset,omitempty"`
CommitPeak uint64 `json:"commitpeakbytes,omitempty" yaml:"commitpeakbytes,omitempty" toml:"commitpeakbytes,omitempty"`
PrivateWorkingSet uint64 `json:"privateworkingset,omitempty" yaml:"privateworkingset,omitempty" toml:"privateworkingset,omitempty"`
} `json:"memory_stats,omitempty" yaml:"memory_stats,omitempty" toml:"memory_stats,omitempty"`
BlkioStats struct {
IOServiceBytesRecursive []BlkioStatsEntry `json:"io_service_bytes_recursive,omitempty" yaml:"io_service_bytes_recursive,omitempty" toml:"io_service_bytes_recursive,omitempty"`
IOServicedRecursive []BlkioStatsEntry `json:"io_serviced_recursive,omitempty" yaml:"io_serviced_recursive,omitempty" toml:"io_serviced_recursive,omitempty"`
IOQueueRecursive []BlkioStatsEntry `json:"io_queue_recursive,omitempty" yaml:"io_queue_recursive,omitempty" toml:"io_queue_recursive,omitempty"`
IOServiceTimeRecursive []BlkioStatsEntry `json:"io_service_time_recursive,omitempty" yaml:"io_service_time_recursive,omitempty" toml:"io_service_time_recursive,omitempty"`
IOWaitTimeRecursive []BlkioStatsEntry `json:"io_wait_time_recursive,omitempty" yaml:"io_wait_time_recursive,omitempty" toml:"io_wait_time_recursive,omitempty"`
IOMergedRecursive []BlkioStatsEntry `json:"io_merged_recursive,omitempty" yaml:"io_merged_recursive,omitempty" toml:"io_merged_recursive,omitempty"`
IOTimeRecursive []BlkioStatsEntry `json:"io_time_recursive,omitempty" yaml:"io_time_recursive,omitempty" toml:"io_time_recursive,omitempty"`
SectorsRecursive []BlkioStatsEntry `json:"sectors_recursive,omitempty" yaml:"sectors_recursive,omitempty" toml:"sectors_recursive,omitempty"`
} `json:"blkio_stats,omitempty" yaml:"blkio_stats,omitempty" toml:"blkio_stats,omitempty"`
CPUStats CPUStats `json:"cpu_stats,omitempty" yaml:"cpu_stats,omitempty" toml:"cpu_stats,omitempty"`
PreCPUStats CPUStats `json:"precpu_stats,omitempty"`
StorageStats struct {
ReadCountNormalized uint64 `json:"read_count_normalized,omitempty" yaml:"read_count_normalized,omitempty" toml:"read_count_normalized,omitempty"`
ReadSizeBytes uint64 `json:"read_size_bytes,omitempty" yaml:"read_size_bytes,omitempty" toml:"read_size_bytes,omitempty"`
WriteCountNormalized uint64 `json:"write_count_normalized,omitempty" yaml:"write_count_normalized,omitempty" toml:"write_count_normalized,omitempty"`
WriteSizeBytes uint64 `json:"write_size_bytes,omitempty" yaml:"write_size_bytes,omitempty" toml:"write_size_bytes,omitempty"`
} `json:"storage_stats,omitempty" yaml:"storage_stats,omitempty" toml:"storage_stats,omitempty"`
}
// NetworkStats is a stats entry for network stats
type NetworkStats struct {
RxDropped uint64 `json:"rx_dropped,omitempty" yaml:"rx_dropped,omitempty" toml:"rx_dropped,omitempty"`
RxBytes uint64 `json:"rx_bytes,omitempty" yaml:"rx_bytes,omitempty" toml:"rx_bytes,omitempty"`
RxErrors uint64 `json:"rx_errors,omitempty" yaml:"rx_errors,omitempty" toml:"rx_errors,omitempty"`
TxPackets uint64 `json:"tx_packets,omitempty" yaml:"tx_packets,omitempty" toml:"tx_packets,omitempty"`
TxDropped uint64 `json:"tx_dropped,omitempty" yaml:"tx_dropped,omitempty" toml:"tx_dropped,omitempty"`
RxPackets uint64 `json:"rx_packets,omitempty" yaml:"rx_packets,omitempty" toml:"rx_packets,omitempty"`
TxErrors uint64 `json:"tx_errors,omitempty" yaml:"tx_errors,omitempty" toml:"tx_errors,omitempty"`
TxBytes uint64 `json:"tx_bytes,omitempty" yaml:"tx_bytes,omitempty" toml:"tx_bytes,omitempty"`
}
// CPUStats is a stats entry for cpu stats
type CPUStats struct {
CPUUsage struct {
PercpuUsage []uint64 `json:"percpu_usage,omitempty" yaml:"percpu_usage,omitempty" toml:"percpu_usage,omitempty"`
UsageInUsermode uint64 `json:"usage_in_usermode,omitempty" yaml:"usage_in_usermode,omitempty" toml:"usage_in_usermode,omitempty"`
TotalUsage uint64 `json:"total_usage,omitempty" yaml:"total_usage,omitempty" toml:"total_usage,omitempty"`
UsageInKernelmode uint64 `json:"usage_in_kernelmode,omitempty" yaml:"usage_in_kernelmode,omitempty" toml:"usage_in_kernelmode,omitempty"`
} `json:"cpu_usage,omitempty" yaml:"cpu_usage,omitempty" toml:"cpu_usage,omitempty"`
SystemCPUUsage uint64 `json:"system_cpu_usage,omitempty" yaml:"system_cpu_usage,omitempty" toml:"system_cpu_usage,omitempty"`
OnlineCPUs uint64 `json:"online_cpus,omitempty" yaml:"online_cpus,omitempty" toml:"online_cpus,omitempty"`
ThrottlingData struct {
Periods uint64 `json:"periods,omitempty"`
ThrottledPeriods uint64 `json:"throttled_periods,omitempty"`
ThrottledTime uint64 `json:"throttled_time,omitempty"`
} `json:"throttling_data,omitempty" yaml:"throttling_data,omitempty" toml:"throttling_data,omitempty"`
}
// BlkioStatsEntry is a stats entry for blkio_stats
type BlkioStatsEntry struct {
Major uint64 `json:"major,omitempty" yaml:"major,omitempty" toml:"major,omitempty"`
Minor uint64 `json:"minor,omitempty" yaml:"minor,omitempty" toml:"minor,omitempty"`
Op string `json:"op,omitempty" yaml:"op,omitempty" toml:"op,omitempty"`
Value uint64 `json:"value,omitempty" yaml:"value,omitempty" toml:"value,omitempty"`
}
// StatsOptions specify parameters to the Stats function.
//
// See https://goo.gl/Dk3Xio for more details.
type StatsOptions struct {
ID string
Stats chan<- *Stats
Stream bool
// A flag that enables stopping the stats operation
Done <-chan bool
// Initial connection timeout
Timeout time.Duration
// Timeout with no data is received, it's reset every time new data
// arrives
InactivityTimeout time.Duration `qs:"-"`
Context context.Context
}
// Stats sends container statistics for the given container to the given channel.
//
// This function is blocking, similar to a streaming call for logs, and should be run
// on a separate goroutine from the caller. Note that this function will block until
// the given container is removed, not just exited. When finished, this function
// will close the given channel. Alternatively, function can be stopped by
// signaling on the Done channel.
//
// See https://goo.gl/Dk3Xio for more details.
func (c *Client) Stats(opts StatsOptions) (retErr error) {
errC := make(chan error, 1)
readCloser, writeCloser := io.Pipe()
defer func() {
close(opts.Stats)
if err := <-errC; err != nil && retErr == nil {
retErr = err
}
if err := readCloser.Close(); err != nil && retErr == nil {
retErr = err
}
}()
reqSent := make(chan struct{})
go func() {
defer close(errC)
err := c.stream(http.MethodGet, fmt.Sprintf("/containers/%s/stats?stream=%v", opts.ID, opts.Stream), streamOptions{
rawJSONStream: true,
useJSONDecoder: true,
stdout: writeCloser,
timeout: opts.Timeout,
inactivityTimeout: opts.InactivityTimeout,
context: opts.Context,
reqSent: reqSent,
})
if err != nil {
var dockerError *Error
if errors.As(err, &dockerError) {
if dockerError.Status == http.StatusNotFound {
err = &NoSuchContainer{ID: opts.ID}
}
}
}
if closeErr := writeCloser.Close(); closeErr != nil && err == nil {
err = closeErr
}
errC <- err
}()
quit := make(chan struct{})
defer close(quit)
go func() {
// block here waiting for the signal to stop function
select {
case <-opts.Done:
readCloser.Close()
case <-quit:
return
}
}()
decoder := json.NewDecoder(readCloser)
stats := new(Stats)
<-reqSent
for err := decoder.Decode(stats); !errors.Is(err, io.EOF); err = decoder.Decode(stats) {
if err != nil {
return err
}
opts.Stats <- stats
stats = new(Stats)
}
return nil
}