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state.go
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state.go
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package state
import (
"bytes"
"context"
"io"
"sync"
"github.com/apache/arrow/go/v16/arrow"
"github.com/apache/arrow/go/v16/arrow/array"
"github.com/apache/arrow/go/v16/arrow/ipc"
"github.com/apache/arrow/go/v16/arrow/memory"
pb "github.com/cloudquery/plugin-pb-go/pb/plugin/v3"
"github.com/cloudquery/plugin-sdk/v4/schema"
"google.golang.org/grpc"
)
const (
keyColumn = "key"
valueColumn = "value"
versionColumn = "version"
)
type Client struct {
client pb.PluginClient
mem map[string]versionedValue
changes map[string]struct{} // changed keys
mutex *sync.RWMutex
schema *arrow.Schema
versionedMode bool
conn *grpc.ClientConn
}
type versionedValue struct {
value string
version uint64
}
func VersionedTable(name string) *schema.Table {
t := table(name)
t.Columns = append(t.Columns, schema.Column{
// Not defined as PrimaryKey to enable single keys if the destination supports PKs
Name: versionColumn,
Type: arrow.PrimitiveTypes.Uint64,
})
return t
}
func NewClient(ctx context.Context, conn *grpc.ClientConn, tableName string) (*Client, error) {
return NewClientWithTable(ctx, conn, table(tableName))
}
func NewClientWithTable(ctx context.Context, conn *grpc.ClientConn, table *schema.Table) (*Client, error) {
c := &Client{
conn: conn,
client: pb.NewPluginClient(conn),
mem: make(map[string]versionedValue),
changes: make(map[string]struct{}),
mutex: &sync.RWMutex{},
versionedMode: table.Column(versionColumn) != nil,
}
sc := table.ToArrowSchema()
c.schema = sc
tableBytes, err := pb.SchemaToBytes(sc)
if err != nil {
return nil, err
}
writeClient, err := c.client.Write(ctx)
if err != nil {
return nil, err
}
if err := writeClient.Send(&pb.Write_Request{
Message: &pb.Write_Request_MigrateTable{
MigrateTable: &pb.Write_MessageMigrateTable{
Table: tableBytes,
},
},
}); err != nil {
return nil, err
}
if _, err := writeClient.CloseAndRecv(); err != nil {
return nil, err
}
readClient, err := c.client.Read(ctx, &pb.Read_Request{
Table: tableBytes,
})
if err != nil {
return nil, err
}
c.mutex.Lock()
defer c.mutex.Unlock()
for {
res, err := readClient.Recv()
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
rdr, err := ipc.NewReader(bytes.NewReader(res.Record))
if err != nil {
return nil, err
}
for {
record, err := rdr.Read()
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
if record.NumRows() == 0 {
continue
}
keys := record.Columns()[0].(*array.String)
values := record.Columns()[1].(*array.String)
var versions *array.Uint64
if c.versionedMode {
versions = record.Columns()[2].(*array.Uint64)
}
for i := 0; i < keys.Len(); i++ {
k, val := keys.Value(i), values.Value(i)
var ver uint64
if versions != nil && versions.IsValid(i) {
ver = versions.Value(i)
}
if cur, ok := c.mem[k]; ok {
if cur.version > ver {
continue
}
}
c.mem[k] = versionedValue{
value: val,
version: ver,
}
}
}
}
return c, nil
}
func (c *Client) SetKey(_ context.Context, key string, value string) error {
c.mutex.Lock()
defer c.mutex.Unlock()
if c.mem[key].value == value {
return nil // don't update if the value is the same
}
c.mem[key] = versionedValue{
value: value,
version: c.mem[key].version + 1,
}
c.changes[key] = struct{}{}
return nil
}
func (c *Client) Flush(ctx context.Context) error {
c.mutex.Lock()
defer c.mutex.Unlock()
bldr := array.NewRecordBuilder(memory.DefaultAllocator, c.schema)
for k := range c.changes {
val := c.mem[k]
bldr.Field(0).(*array.StringBuilder).Append(k)
bldr.Field(1).(*array.StringBuilder).Append(val.value)
if c.versionedMode {
bldr.Field(2).(*array.Uint64Builder).Append(val.version)
}
}
rec := bldr.NewRecord()
recordBytes, err := pb.RecordToBytes(rec)
if err != nil {
return err
}
writeClient, err := c.client.Write(ctx)
if err != nil {
return err
}
if err := writeClient.Send(&pb.Write_Request{
Message: &pb.Write_Request_Insert{
Insert: &pb.Write_MessageInsert{
Record: recordBytes,
},
},
}); err != nil {
return err
}
if _, err := writeClient.CloseAndRecv(); err != nil {
return err
}
c.changes = make(map[string]struct{})
return nil
}
func (c *Client) GetKey(_ context.Context, key string) (string, error) {
c.mutex.RLock()
defer c.mutex.RUnlock()
return c.mem[key].value, nil
}
func (c *Client) Close() error {
if c.conn != nil {
return c.conn.Close()
}
return nil
}
func table(name string) *schema.Table {
return &schema.Table{
Name: name,
Columns: []schema.Column{
{
Name: keyColumn,
Type: arrow.BinaryTypes.String,
PrimaryKey: true,
},
{
Name: valueColumn,
Type: arrow.BinaryTypes.String,
},
},
}
}