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plugin.go
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plugin.go
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package postgres_incr_sync
import (
"context"
"fmt"
"github.com/apache/arrow/go/v14/arrow/array"
"github.com/apache/arrow/go/v14/arrow/memory"
"github.com/charmbracelet/log"
"github.com/cloudquery/plugin-sdk/v4/scalar"
"github.com/jackc/pgx/v5"
"github.com/usedatabrew/blink/internal/offset_storage"
"github.com/usedatabrew/blink/internal/schema"
"github.com/usedatabrew/blink/internal/sources"
"github.com/usedatabrew/blink/internal/stream_context"
"github.com/usedatabrew/message"
"strings"
"time"
)
type SourcePlugin struct {
ctx context.Context
config Config
syncTicker *time.Ticker
appCtx *stream_context.Context
streamSchema []schema.StreamSchema
streamSchemaMap map[string]schema.StreamSchema
streamPks map[string]string
logger *log.Logger
streamColumnsToSelect map[string][]string
pgConn *pgx.Conn
messagesStream chan sources.MessageEvent
}
func NewPostgresIncrSourcePlugin(appCtx *stream_context.Context, config Config, s []schema.StreamSchema) sources.DataSource {
plugin := &SourcePlugin{
appCtx: appCtx,
syncTicker: time.NewTicker(time.Second * 5),
config: config,
streamSchema: s,
logger: appCtx.Logger.WithPrefix("Source [postgres_incremental_sync]"),
streamSchemaMap: map[string]schema.StreamSchema{},
streamPks: map[string]string{},
streamColumnsToSelect: map[string][]string{},
messagesStream: make(chan sources.MessageEvent),
}
plugin.buildSchemaMap()
return plugin
}
func (p *SourcePlugin) Connect(ctx context.Context) error {
sslVerifySettings := ""
if p.config.SSLRequired {
sslVerifySettings = "?sslmode=verify-full"
}
link := fmt.Sprintf("postgres://%s:%s@%s:%d/%s%s",
p.config.User,
p.config.Password,
p.config.Host,
p.config.Port,
p.config.Database,
sslVerifySettings,
)
conn, err := pgx.Connect(ctx, link)
if err != nil {
return err
}
p.pgConn = conn
p.ctx = ctx
return nil
}
func (p *SourcePlugin) Events() chan sources.MessageEvent {
return p.messagesStream
}
func (p *SourcePlugin) Start() {
for {
select {
case <-p.syncTicker.C:
for _, stream := range p.streamSchema {
var offset int64 = 0
streamStoredOffset, _ := p.appCtx.OffsetStorage().GetOffsetByPipelineStream(offset_storage.BuildKey(p.appCtx.PipelineId(), stream.StreamName))
if !p.config.StreamSnapshot {
if streamStoredOffset == 0 {
offset = p.selectLastRecordId(stream.StreamName)
p.logger.Info("Snapshot streaming is disabled. Starting sync form the offset", "offset", offset)
} else {
offset = streamStoredOffset
}
} else {
if streamStoredOffset > 0 {
offset = streamStoredOffset
p.logger.Info("Stream snapshot enabled, continue from stored offset", "offset", 0)
} else {
p.logger.Info("Stream snapshot enabled, not stored offset not found. Starting from 0", "offset", 0)
}
}
if schem, ok := p.streamSchemaMap[stream.StreamName]; ok {
arrowSchema := schem.AsArrow()
builder := array.NewRecordBuilder(memory.DefaultAllocator, arrowSchema)
pkForStream := p.streamPks[stream.StreamName]
selectColumns := strings.Join(p.streamColumnsToSelect[stream.StreamName], ", ")
q := fmt.Sprintf("SELECT %s FROM %s WHERE %s > %d ORDER BY %s ASC LIMIT 10000", selectColumns, stream.StreamName, pkForStream, offset, pkForStream)
rows, err := p.pgConn.Query(p.ctx, q)
if err != nil {
p.appCtx.Logger.Fatalf("Failed to query data for offset %s", err.Error())
}
var rowsFetched = 0
for rows.Next() {
rowsFetched += 1
values, err := rows.Values()
if err != nil {
panic(err)
}
for i, v := range values {
s := scalar.NewScalar(arrowSchema.Field(i).Type)
if err := s.Set(v); err != nil {
panic(err)
}
scalar.AppendToBuilder(builder.Field(i), s)
}
data, _ := builder.NewRecord().MarshalJSON()
splitStream := strings.Split(stream.StreamName, ".")
m := message.NewMessage(message.Insert, splitStream[len(splitStream)-1], data)
p.messagesStream <- sources.MessageEvent{
Message: m,
Err: err,
}
}
if rowsFetched == 0 {
p.logger.Info("No rows were fetched, waiting for the data to appear...")
p.logger.Info("Updating offset", "offset", offset)
err = p.appCtx.OffsetStorage().SetOffsetForPipeline(offset_storage.BuildKey(p.appCtx.PipelineId(), stream.StreamName), offset)
if err != nil {
p.logger.Fatalf("Failed to store the offset %s", err.Error())
}
continue
}
if rowsFetched == 0 && streamStoredOffset == 0 {
p.logger.Info("No rows fetched after the initial connection. Waiting for the first new rows to appear")
p.logger.Info("Storing default offset", "offset", offset)
err = p.appCtx.OffsetStorage().SetOffsetForPipeline(offset_storage.BuildKey(p.appCtx.PipelineId(), stream.StreamName), offset)
if err != nil {
p.logger.Fatalf("Failed to store the offset %s", err.Error())
}
} else {
newOffset := streamStoredOffset + int64(rowsFetched)
p.logger.Infof("Fetched %d storing new offset %d", rowsFetched, newOffset)
err = p.appCtx.OffsetStorage().SetOffsetForPipeline(offset_storage.BuildKey(p.appCtx.PipelineId(), stream.StreamName), newOffset)
if err != nil {
p.logger.Fatalf("Failed to store the offset %s", err.Error())
}
}
}
}
}
}
}
func (p *SourcePlugin) Stop() {
p.syncTicker.Stop()
}
func (p *SourcePlugin) selectLastRecordId(streamName string) int64 {
pkForStream := p.streamPks[streamName]
res := p.pgConn.QueryRow(context.Background(), fmt.Sprintf("SELECT MAX(%s) as last_row FROM %s", pkForStream, streamName))
var result int64
err := res.Scan(&result)
if err != nil {
panic(err)
}
return result
}
func (p *SourcePlugin) buildSchemaMap() {
for _, stream := range p.streamSchema {
var columnsToSelect []string
p.streamSchemaMap[stream.StreamName] = stream
for _, c := range stream.Columns {
if c.PK {
p.streamPks[stream.StreamName] = c.Name
}
columnsToSelect = append(columnsToSelect, c.Name)
}
p.streamColumnsToSelect[stream.StreamName] = columnsToSelect
}
}