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podman_client.go
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podman_client.go
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// Copyright 2020 OpenTelemetry 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.
//go:build !windows
// +build !windows
package podmanreceiver
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"time"
"go.uber.org/zap"
)
type containerStats struct {
AvgCPU float64
ContainerID string
Name string
PerCPU []uint64
CPU float64
CPUNano uint64
CPUSystemNano uint64
DataPoints int64
SystemNano uint64
MemUsage uint64
MemLimit uint64
MemPerc float64
NetInput uint64
NetOutput uint64
BlockInput uint64
BlockOutput uint64
PIDs uint64
UpTime time.Duration
Duration uint64
}
type containerStatsReport struct {
Error string
Stats []containerStats
}
type clientFactory func(logger *zap.Logger, cfg *Config) (client, error)
type client interface {
stats() ([]containerStats, error)
}
type podmanClient struct {
conn *http.Client
endpoint string
}
func newPodmanClient(logger *zap.Logger, cfg *Config) (client, error) {
connection, err := newPodmanConnection(logger, cfg.Endpoint, cfg.SSHKey, cfg.SSHPassphrase)
if err != nil {
return nil, err
}
c := &podmanClient{
conn: connection,
endpoint: fmt.Sprintf("http://d/v%s/libpod", cfg.APIVersion),
}
err = c.ping()
if err != nil {
return nil, err
}
return c, nil
}
func (c *podmanClient) request(ctx context.Context, path string, params url.Values) (*http.Response, error) {
req, err := http.NewRequestWithContext(ctx, "GET", c.endpoint+path, nil)
if err != nil {
return nil, err
}
if len(params) > 0 {
req.URL.RawQuery = params.Encode()
}
return c.conn.Do(req)
}
func (c *podmanClient) stats() ([]containerStats, error) {
params := url.Values{}
params.Add("stream", "false")
resp, err := c.request(context.Background(), "/containers/stats", params)
if err != nil {
return nil, err
}
defer resp.Body.Close()
bytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
report := &containerStatsReport{}
err = json.Unmarshal(bytes, report)
if err != nil {
return nil, err
}
if report.Error != "" {
return nil, errors.New(report.Error)
}
return report.Stats, nil
}
func (c *podmanClient) ping() error {
resp, err := c.request(context.Background(), "/_ping", nil)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("ping response was %d", resp.StatusCode)
}
return nil
}