container: support hostprocess containers and expose kubernetes labels (#1911)

internal/headers/hcs/hcs.go

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright 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.
+
+//go:build windows
+
+package hcs
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/prometheus-community/windows_exporter/internal/utils"
+	"golang.org/x/sys/windows"
+)
+
+//nolint:gochecknoglobals
+var (
+	ContainerQuery  = utils.Must(windows.UTF16PtrFromString(`{"Types":["Container"]}`))
+	StatisticsQuery = utils.Must(windows.UTF16PtrFromString(`{"PropertyTypes":["Statistics"]}`))
+)
+
+func GetContainers() ([]Properties, error) {
+	operation, err := CreateOperation()
+	if err != nil {
+		return nil, fmt.Errorf("failed to create operation: %w", err)
+	}
+
+	defer CloseOperation(operation)
+
+	if err := EnumerateComputeSystems(ContainerQuery, operation); err != nil {
+		return nil, fmt.Errorf("failed to enumerate compute systems: %w", err)
+	}
+
+	resultDocument, err := WaitForOperationResult(operation, 1000)
+	if err != nil {
+		return nil, fmt.Errorf("failed to wait and get for operation result: %w - %s", err, resultDocument)
+	} else if resultDocument == "" {
+		return nil, ErrEmptyResultDocument
+	}
+
+	var computeSystems []Properties
+	if err := json.Unmarshal([]byte(resultDocument), &computeSystems); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal compute systems: %w", err)
+	}
+
+	return computeSystems, nil
+}
+
+func GetContainerStatistics(containerID string) (Statistics, error) {
+	computeSystem, err := OpenComputeSystem(containerID)
+	if err != nil {
+		return Statistics{}, fmt.Errorf("failed to open compute system: %w", err)
+	}
+
+	defer CloseComputeSystem(computeSystem)
+
+	operation, err := CreateOperation()
+	if err != nil {
+		return Statistics{}, fmt.Errorf("failed to create operation: %w", err)
+	}
+
+	defer CloseOperation(operation)
+
+	if err := GetComputeSystemProperties(computeSystem, operation, StatisticsQuery); err != nil {
+		return Statistics{}, fmt.Errorf("failed to enumerate compute systems: %w", err)
+	}
+
+	resultDocument, err := WaitForOperationResult(operation, 1000)
+	if err != nil {
+		return Statistics{}, fmt.Errorf("failed to get compute system properties: %w", err)
+	} else if resultDocument == "" {
+		return Statistics{}, ErrEmptyResultDocument
+	}
+
+	var properties Properties
+	if err := json.Unmarshal([]byte(resultDocument), &properties); err != nil {
+		return Statistics{}, fmt.Errorf("failed to unmarshal system properties: %w", err)
+	}
+
+	if properties.Statistics == nil {
+		return Statistics{}, fmt.Errorf("no statistics found for container %s", containerID)
+	}
+
+	return *properties.Statistics, nil
+}