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store.go
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store.go
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package cosmosdb
import (
"bytes"
"context"
"encoding/base32"
"encoding/json"
"errors"
"fmt"
"net/http"
"sort"
"github.com/Azure/azure-sdk-for-go/sdk/azcore"
"github.com/Azure/azure-sdk-for-go/sdk/azcore/runtime"
"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
"github.com/Azure/azure-sdk-for-go/sdk/data/azcosmos"
"github.com/treeverse/lakefs/pkg/ident"
"github.com/treeverse/lakefs/pkg/kv"
"github.com/treeverse/lakefs/pkg/kv/kvparams"
"github.com/treeverse/lakefs/pkg/logging"
)
type Driver struct{}
type Store struct {
containerClient *azcosmos.ContainerClient
consistencyLevel azcosmos.ConsistencyLevel
logger logging.Logger
}
const (
DriverName = "cosmosdb"
)
// encoding is the encoding used to encode the partition keys, ids and values.
// Must be an encoding that keeps the strings in-order.
var encoding = base32.HexEncoding // Encoding that keeps the strings in-order.
//nolint:gochecknoinits
func init() {
kv.Register(DriverName, &Driver{})
}
// Open - opens and returns a KV store over CosmosDB. This function creates the DB session
// and sets up the KV table.
func (d *Driver) Open(ctx context.Context, kvParams kvparams.Config) (kv.Store, error) {
params := kvParams.CosmosDB
if params == nil {
return nil, fmt.Errorf("missing %s settings: %w", DriverName, kv.ErrDriverConfiguration)
}
if params.Endpoint == "" {
return nil, fmt.Errorf("missing endpoint: %w", kv.ErrDriverConfiguration)
}
if params.Database == "" {
return nil, fmt.Errorf("missing database: %w", kv.ErrDriverConfiguration)
}
if params.Container == "" {
return nil, fmt.Errorf("missing container: %w", kv.ErrDriverConfiguration)
}
logger := logging.FromContext(ctx).WithField("store", DriverName)
logger.Infof("CosmosDB: connecting to %s", params.Endpoint)
var client *azcosmos.Client
if params.Key != "" {
cred, err := azcosmos.NewKeyCredential(params.Key)
if err != nil {
return nil, fmt.Errorf("creating key: %w", err)
}
// hook for using emulator for testing
if params.Client == nil {
params.Client = http.DefaultClient
}
// Create a CosmosDB client
client, err = azcosmos.NewClientWithKey(params.Endpoint, cred, &azcosmos.ClientOptions{
ClientOptions: azcore.ClientOptions{
Transport: params.Client,
},
})
if err != nil {
return nil, fmt.Errorf("creating client using access key: %w", err)
}
} else {
cred, err := azidentity.NewDefaultAzureCredential(nil)
if err != nil {
return nil, fmt.Errorf("default creds: %w", err)
}
client, err = azcosmos.NewClient(params.Endpoint, cred, nil)
if err != nil {
return nil, fmt.Errorf("creating client with default creds: %w", err)
}
}
dbClient, err := getOrCreateDatabase(ctx, client, params)
if err != nil {
return nil, err
}
// Create container client
containerClient, err := getOrCreateContainer(ctx, dbClient, params)
if err != nil {
return nil, err
}
cLevel := azcosmos.ConsistencyLevelBoundedStaleness
if !params.StrongConsistency {
cLevel = azcosmos.ConsistencyLevelSession
}
return &Store{
containerClient: containerClient,
consistencyLevel: cLevel,
logger: logger,
}, nil
}
func getOrCreateDatabase(ctx context.Context, client *azcosmos.Client, params *kvparams.CosmosDB) (*azcosmos.DatabaseClient, error) {
_, err := client.CreateDatabase(ctx, azcosmos.DatabaseProperties{ID: params.Database}, nil)
if err != nil {
if errStatusCode(err) != http.StatusConflict {
return nil, fmt.Errorf("creating database: %w", err)
}
}
dbClient, err := client.NewDatabase(params.Database)
if err != nil {
return nil, fmt.Errorf("init database client: %w", err)
}
return dbClient, nil
}
func getOrCreateContainer(ctx context.Context, dbClient *azcosmos.DatabaseClient, params *kvparams.CosmosDB) (*azcosmos.ContainerClient, error) {
var opts *azcosmos.CreateContainerOptions
if params.Throughput > 0 {
var throughputProperties azcosmos.ThroughputProperties
if params.Autoscale {
throughputProperties = azcosmos.NewAutoscaleThroughputProperties(params.Throughput)
} else {
throughputProperties = azcosmos.NewManualThroughputProperties(params.Throughput)
}
opts = &azcosmos.CreateContainerOptions{ThroughputProperties: &throughputProperties}
}
_, err := dbClient.CreateContainer(ctx,
azcosmos.ContainerProperties{
ID: params.Container,
PartitionKeyDefinition: azcosmos.PartitionKeyDefinition{
Paths: []string{"/partitionKey"},
},
// Excluding the value field from indexing since it is not used in queries and saves RUs for writes.
// partitionKey is automatically not indexed. The rest of the fields are indexed by default, including id
// which is unnecessary, but cannot be excluded.
IndexingPolicy: &azcosmos.IndexingPolicy{
Automatic: false,
IndexingMode: azcosmos.IndexingModeConsistent,
IncludedPaths: []azcosmos.IncludedPath{{Path: "/*"}},
ExcludedPaths: []azcosmos.ExcludedPath{{Path: "/value/?"}},
},
}, opts)
if err != nil {
if errStatusCode(err) != http.StatusConflict {
return nil, fmt.Errorf("creating container: %w", err)
}
}
containerClient, err := dbClient.NewContainer(params.Container)
if err != nil {
return nil, fmt.Errorf("init container client: %w", err)
}
return containerClient, nil
}
// hashID returns a hash of the key that is used as the document id.
func (s *Store) hashID(key []byte) string {
return encoding.EncodeToString(ident.NewAddressWriter().MarshalBytes(key).Identity())
}
type Document struct {
PartitionKey string `json:"partitionKey"`
// ID is the hash of the key. It is used as the document id for lookup of a single item.
// CosmosDB has a 1023 byte limit on the id, so we hash the key to ensure it fits.
ID string `json:"id"`
// Key is the original key. It is not used listing of items by order.
Key string `json:"key"`
Value string `json:"value"`
}
func (s *Store) Get(ctx context.Context, partitionKey, key []byte) (*kv.ValueWithPredicate, error) {
if len(partitionKey) == 0 {
return nil, kv.ErrMissingPartitionKey
}
if len(key) == 0 {
return nil, kv.ErrMissingKey
}
item := Document{
PartitionKey: encoding.EncodeToString(partitionKey),
ID: s.hashID(key),
}
pk := azcosmos.NewPartitionKeyString(item.PartitionKey)
// Read an item
itemResponse, err := s.containerClient.ReadItem(ctx, pk, item.ID, nil)
if err != nil {
return nil, convertError(err)
}
var itemResponseBody Document
err = json.Unmarshal(itemResponse.Value, &itemResponseBody)
if err != nil {
return nil, err
}
val, err := encoding.DecodeString(itemResponseBody.Value)
if err != nil {
return nil, err
}
return &kv.ValueWithPredicate{
Value: val,
Predicate: kv.Predicate([]byte(itemResponse.ETag)),
}, nil
}
func errStatusCode(err error) int {
var respErr *azcore.ResponseError
if !errors.As(err, &respErr) {
return -1
}
return respErr.StatusCode
}
func isErrStatusCode(err error, code int) bool {
return errStatusCode(err) == code
}
func convertError(err error) error {
statusCode := errStatusCode(err)
switch statusCode {
case http.StatusTooManyRequests:
return kv.ErrSlowDown
case http.StatusPreconditionFailed:
return kv.ErrPredicateFailed
case http.StatusNotFound:
return kv.ErrNotFound
case http.StatusConflict:
return kv.ErrPredicateFailed
}
return err
}
func (s *Store) Set(ctx context.Context, partitionKey, key, value []byte) error {
if len(partitionKey) == 0 {
return kv.ErrMissingPartitionKey
}
if len(key) == 0 {
return kv.ErrMissingKey
}
if value == nil {
return kv.ErrMissingValue
}
// Specifies the value of the partiton key
item := Document{
PartitionKey: encoding.EncodeToString(partitionKey),
ID: s.hashID(key),
Key: encoding.EncodeToString(key),
Value: encoding.EncodeToString(value),
}
b, err := json.Marshal(item)
if err != nil {
return err
}
itemOptions := azcosmos.ItemOptions{
ConsistencyLevel: s.consistencyLevel.ToPtr(),
}
pk := azcosmos.NewPartitionKeyString(item.PartitionKey)
_, err = s.containerClient.UpsertItem(ctx, pk, b, &itemOptions)
return convertError(err)
}
func (s *Store) SetIf(ctx context.Context, partitionKey, key, value []byte, valuePredicate kv.Predicate) error {
if len(partitionKey) == 0 {
return kv.ErrMissingPartitionKey
}
if len(key) == 0 {
return kv.ErrMissingKey
}
if value == nil {
return kv.ErrMissingValue
}
// Specifies the value of the partiton key
item := Document{
PartitionKey: encoding.EncodeToString(partitionKey),
ID: s.hashID(key),
Key: encoding.EncodeToString(key),
Value: encoding.EncodeToString(value),
}
b, err := json.Marshal(item)
if err != nil {
return err
}
itemOptions := azcosmos.ItemOptions{
ConsistencyLevel: s.consistencyLevel.ToPtr(),
}
pk := azcosmos.NewPartitionKeyString(item.PartitionKey)
switch valuePredicate {
case nil:
_, err = s.containerClient.CreateItem(ctx, pk, b, &itemOptions)
case kv.PrecondConditionalExists:
patch := azcosmos.PatchOperations{}
patch.AppendReplace("/value", item.Value)
_, err = s.containerClient.PatchItem(
ctx,
pk,
item.ID,
patch,
&itemOptions,
)
if isErrStatusCode(err, http.StatusNotFound) {
return kv.ErrPredicateFailed
}
default:
etag := azcore.ETag(valuePredicate.([]byte))
itemOptions.IfMatchEtag = &etag
_, err = s.containerClient.UpsertItem(ctx, pk, b, &itemOptions)
}
return convertError(err)
}
func (s *Store) Delete(ctx context.Context, partitionKey, key []byte) error {
if len(partitionKey) == 0 {
return kv.ErrMissingPartitionKey
}
if len(key) == 0 {
return kv.ErrMissingKey
}
pk := azcosmos.NewPartitionKeyString(encoding.EncodeToString(partitionKey))
_, err := s.containerClient.DeleteItem(ctx, pk, s.hashID(key), nil)
if err != nil {
err = convertError(err)
}
if !errors.Is(err, kv.ErrNotFound) {
return err
}
return nil
}
func (s *Store) Scan(ctx context.Context, partitionKey []byte, options kv.ScanOptions) (kv.EntriesIterator, error) {
if len(partitionKey) == 0 {
return nil, kv.ErrMissingPartitionKey
}
it := &EntriesIterator{
store: s,
partitionKey: partitionKey,
startKey: options.KeyStart,
limit: options.BatchSize,
queryCtx: ctx,
encoding: encoding,
}
if err := it.runQuery(); err != nil {
return nil, convertError(err)
}
return it, nil
}
func (s *Store) Close() {
}
type EntriesIterator struct {
store *Store
partitionKey []byte
startKey []byte
limit int
entry *kv.Entry
err error
currEntryIdx int
queryPager *runtime.Pager[azcosmos.QueryItemsResponse]
queryCtx context.Context
currPage azcosmos.QueryItemsResponse
// currPageSeekedKey is the key we seeked to get this page, will be nil if this page wasn't returned by the query
currPageSeekedKey []byte
// currPageHasMore is true if the current page has more after it
encoding *base32.Encoding
}
func (e *EntriesIterator) getKeyValue(i int) ([]byte, []byte) {
var itemResponseBody Document
err := json.Unmarshal(e.currPage.Items[i], &itemResponseBody)
if err != nil {
e.err = fmt.Errorf("failed to unmarshal: %w", err)
return nil, nil
}
key, err := e.encoding.DecodeString(itemResponseBody.Key)
if err != nil {
e.err = fmt.Errorf("failed to decode id: %w", err)
return nil, nil
}
value, err := e.encoding.DecodeString(itemResponseBody.Value)
if err != nil {
e.err = fmt.Errorf("failed to decode value: %w", err)
return nil, nil
}
return key, value
}
func (e *EntriesIterator) Next() bool {
if e.err != nil {
return false
}
if e.currEntryIdx+1 >= len(e.currPage.Items) {
if !e.queryPager.More() {
return false
}
var err error
e.currPage, err = e.queryPager.NextPage(e.queryCtx)
if err != nil {
e.err = fmt.Errorf("getting next page: %w", convertError(err))
return false
}
if len(e.currPage.Items) == 0 {
// returned page is empty, no more items
return false
}
e.currPageSeekedKey = nil
e.currEntryIdx = -1
}
e.currEntryIdx++
key, value := e.getKeyValue(e.currEntryIdx)
if e.err != nil {
return false
}
e.entry = &kv.Entry{
Key: key,
Value: value,
}
return true
}
func (e *EntriesIterator) SeekGE(key []byte) {
e.startKey = key
if !e.isInRange() {
if err := e.runQuery(); err != nil {
e.err = convertError(err)
}
return
}
idx := sort.Search(len(e.currPage.Items), func(i int) bool {
currentKey, _ := e.getKeyValue(i)
if e.err != nil {
return false
}
return bytes.Compare(key, currentKey) <= 0
})
if idx == -1 {
// not found, set to the end
e.currEntryIdx = len(e.currPage.Items)
}
e.currEntryIdx = idx - 1
}
func (e *EntriesIterator) Entry() *kv.Entry {
return e.entry
}
func (e *EntriesIterator) Err() error {
return e.err
}
func (e *EntriesIterator) Close() {
e.err = kv.ErrClosedEntries
}
func (e *EntriesIterator) runQuery() error {
pk := azcosmos.NewPartitionKeyString(encoding.EncodeToString(e.partitionKey))
e.queryPager = e.store.containerClient.NewQueryItemsPager("select * from c where c.key >= @start order by c.key", pk, &azcosmos.QueryOptions{
ConsistencyLevel: e.store.consistencyLevel.ToPtr(),
PageSizeHint: int32(e.limit),
QueryParameters: []azcosmos.QueryParameter{{
Name: "@start",
Value: encoding.EncodeToString(e.startKey),
}},
})
currPage, err := e.queryPager.NextPage(e.queryCtx)
if err != nil {
return err
}
e.currEntryIdx = -1
e.entry = nil
e.currPage = currPage
e.currPageSeekedKey = e.startKey
return nil
}
// isInRange checks if e.startKey falls within the range of keys on the current page.
// To optimize range checking:
// - If the current page is a result of a seek operation, the seeked key is used as the minimum key.
// - If the current page is the last page, all keys greater than the minimum key are considered in range.
// This function returns true if e.startKey is within these defined range criteria.
func (e *EntriesIterator) isInRange() bool {
if e.err != nil {
return false
}
var minKey []byte
if e.currPageSeekedKey != nil {
minKey = e.currPageSeekedKey
} else {
if len(e.currPage.Items) == 0 {
return false
}
minKey, _ = e.getKeyValue(0)
if minKey == nil {
return false
}
}
if bytes.Compare(e.startKey, minKey) < 0 {
return false
}
if !e.queryPager.More() {
// last page, all keys greater than minKey are considered in range (in order to avoid unnecessary queries)
return true
}
if len(e.currPage.Items) == 0 {
// cosmosdb returned empty page but has more results, should not happen
return false
}
maxKey, _ := e.getKeyValue(len(e.currPage.Items) - 1)
return maxKey != nil && bytes.Compare(e.startKey, maxKey) <= 0
}