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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package resource
import (
"errors"
"io"
"os"
"strings"
"testing"
"github.com/stretchr/testify/assert"
)
func setDefaultContainerProviders() {
setContainerProviders(
getContainerIDFromCGroup,
)
}
func setContainerProviders(
idProvider containerIDProvider,
) {
containerID = idProvider
}
func TestGetContainerIDFromLine(t *testing.T) {
testCases := []struct {
name string
line string
expectedContainerID string
}{
{
name: "with suffix",
line: "13:name=systemd:/podruntime/docker/kubepods/ac679f8a8319c8cf7d38e1adf263bc08d23.aaaa",
expectedContainerID: "ac679f8a8319c8cf7d38e1adf263bc08d23",
},
{
name: "with prefix and suffix",
line: "13:name=systemd:/podruntime/docker/kubepods/crio-dc679f8a8319c8cf7d38e1adf263bc08d23.stuff",
expectedContainerID: "dc679f8a8319c8cf7d38e1adf263bc08d23",
},
{
name: "no prefix and suffix",
line: "13:name=systemd:/pod/d86d75589bf6cc254f3e2cc29debdf85dde404998aa128997a819ff991827356",
expectedContainerID: "d86d75589bf6cc254f3e2cc29debdf85dde404998aa128997a819ff991827356",
},
{
name: "with space",
line: " 13:name=systemd:/pod/d86d75589bf6cc254f3e2cc29debdf85dde404998aa128997a819ff991827356 ",
expectedContainerID: "d86d75589bf6cc254f3e2cc29debdf85dde404998aa128997a819ff991827356",
},
{
name: "with colon",
line: " 13:name=systemd:/kuberuntime/containerd/kubepods-pod872d2066_00ef_48ea_a7d8_51b18b72d739:cri-containerd:e857a4bf05a69080a759574949d7a0e69572e27647800fa7faff6a05a8332aa1",
expectedContainerID: "e857a4bf05a69080a759574949d7a0e69572e27647800fa7faff6a05a8332aa1",
},
{
name: "invalid hex string",
line: "13:name=systemd:/podruntime/docker/kubepods/ac679f8a8319c8cf7d38e1adf263bc08d23zzzz",
},
{
name: "no container id - 1",
line: "pids: /",
},
{
name: "no container id - 2",
line: "pids: ",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
containerID := getContainerIDFromLine(tc.line)
assert.Equal(t, tc.expectedContainerID, containerID)
})
}
}
func TestGetContainerIDFromReader(t *testing.T) {
testCases := []struct {
name string
reader io.Reader
expectedContainerID string
}{
{
name: "multiple lines",
reader: strings.NewReader(`//
1:name=systemd:/podruntime/docker/kubepods/docker-dc579f8a8319c8cf7d38e1adf263bc08d23
1:name=systemd:/podruntime/docker/kubepods/docker-dc579f8a8319c8cf7d38e1adf263bc08d24
`),
expectedContainerID: "dc579f8a8319c8cf7d38e1adf263bc08d23",
},
{
name: "no container id",
reader: strings.NewReader(`//
1:name=systemd:/podruntime/docker
`),
expectedContainerID: "",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
containerID := getContainerIDFromReader(tc.reader)
assert.Equal(t, tc.expectedContainerID, containerID)
})
}
}
func TestGetContainerIDFromCGroup(t *testing.T) {
t.Cleanup(func() {
osStat = defaultOSStat
osOpen = defaultOSOpen
})
testCases := []struct {
name string
cgroupFileNotExist bool
openFileError error
content string
expectedContainerID string
expectedError bool
}{
{
name: "the cgroup file does not exist",
cgroupFileNotExist: true,
},
{
name: "error when opening cgroup file",
openFileError: errors.New("test"),
expectedError: true,
},
{
name: "cgroup file",
content: "1:name=systemd:/podruntime/docker/kubepods/docker-dc579f8a8319c8cf7d38e1adf263bc08d23",
expectedContainerID: "dc579f8a8319c8cf7d38e1adf263bc08d23",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
osStat = func(name string) (os.FileInfo, error) {
if tc.cgroupFileNotExist {
return nil, os.ErrNotExist
}
return nil, nil
}
osOpen = func(name string) (io.ReadCloser, error) {
if tc.openFileError != nil {
return nil, tc.openFileError
}
return io.NopCloser(strings.NewReader(tc.content)), nil
}
containerID, err := getContainerIDFromCGroup()
assert.Equal(t, tc.expectedError, err != nil)
assert.Equal(t, tc.expectedContainerID, containerID)
})
}
}
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