kserve/pkg/agent/mocks/azuremock.go

/*
Copyright 2023 The KServe 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 mocks

import (
	"context"
	"os"

	"github.com/Azure/azure-sdk-for-go/sdk/azcore/runtime"
	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob"
	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/container"
)

type mockAzureObject struct {
	blobItem *container.BlobItem
	buffer   []byte
}

type mockAzureBucket struct {
	objects map[string]*mockAzureObject
}

type mockAzureClient struct {
	buckets map[string]*mockAzureBucket
}

func (m mockAzureClient) NewListBlobsFlatPager(bucket string, options *azblob.ListBlobsFlatOptions) *runtime.Pager[azblob.ListBlobsFlatResponse] {
	pager := runtime.NewPager[azblob.ListBlobsFlatResponse](
		runtime.PagingHandler[azblob.ListBlobsFlatResponse]{
			More: func(page azblob.ListBlobsFlatResponse) bool {
				return false
			},
			Fetcher: func(context.Context, *azblob.ListBlobsFlatResponse) (azblob.ListBlobsFlatResponse, error) {
				containerBucket := m.buckets[bucket]
				blobItems := make([]*container.BlobItem, 0, len(containerBucket.objects))
				for _, obj := range containerBucket.objects {
					blobItems = append(blobItems, obj.blobItem)
				}
				return azblob.ListBlobsFlatResponse{
					ListBlobsFlatSegmentResponse: container.ListBlobsFlatSegmentResponse{
						ContainerName: &bucket,
						Segment: &container.BlobFlatListSegment{
							BlobItems: blobItems,
						},
					},
				}, nil
			},
		},
	)
	return pager
}

func (m mockAzureClient) DownloadFile(ctx context.Context, bucket string, prefix string, file *os.File, options *azblob.DownloadFileOptions) (int64, error) {
	containerBucket := m.buckets[bucket]
	for key, obj := range containerBucket.objects {
		if key == prefix {
			_, _ = file.Write(obj.buffer)
			return int64(len(obj.buffer)), nil
		}
	}
	return 0, nil
}

func (m mockAzureClient) UploadBuffer(ctx context.Context, bucket string, key string, object []byte, o *azblob.UploadBufferOptions) (azblob.UploadBufferResponse, error) {
	m.buckets[bucket].objects[key] = &mockAzureObject{
		blobItem: &container.BlobItem{
			Name: &key,
		},
		buffer: object,
	}
	return azblob.UploadBufferResponse{}, nil
}

func NewMockAzureClient() *mockAzureClient {
	return &mockAzureClient{buckets: map[string]*mockAzureBucket{}}
}