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datapoint.go
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datapoint.go
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package db
import (
"fmt"
"github.com/go-xorm/xorm"
)
type UserClassification int
const (
NO_DECISION UserClassification = iota
POSITIVE
NEGATIVE
)
// DataPoint for doing our learning
type DataPoint struct {
// auto public key
Id int64
NewsItemId int64 `xorm:"index"`
Keywords []string
Outcome UserClassification
}
type ProcessQueue struct {
// auto public key
Id int64
FeedItemId int64 `xorm:"index"`
NewsItemId int64 `xorm:"index"`
}
type DataPointClient struct {
Engine *xorm.Engine
}
func (c *DataPointClient) GetProcessQueue() ([]*ProcessQueue, error) {
//func (c *Client) GetProcessQueue() ([]*FeedItem, error) {
var res []*ProcessQueue
if err := c.Engine.Find(&res); err != nil {
return nil, err
}
return res, nil
}
func (c *DataPointClient) MarkAsProcessed(q *ProcessQueue, keywords []string) error {
if _, err := c.Engine.Insert(&DataPoint{NewsItemId: q.NewsItemId, Keywords: keywords}); err != nil {
return err
}
// Note: this is not atomic. TODO for future
if _, err := c.Engine.Delete(q); err != nil {
return err
}
return nil
}
// look through datapoints and find news feed that is not a point yet.
func (c *DataPointClient) PopulateProcessQueue() error {
return populateUnprocessedNews(c.Engine)
}
func (c *DataPointClient) GetDataPoint(newsID int64) (*DataPoint, error) {
var res DataPoint
ok, err := c.Engine.Where(fmt.Sprintf("news_item_id = %d", newsID)).Get(&res)
if err != nil {
return nil, err
}
if !ok {
return nil, fmt.Errorf("get: not found")
}
return &res, nil
}
func (c *DataPointClient) SaveDataPoint(point *DataPoint) error {
_, err := c.Engine.Id(point.Id).Update(point)
return err
}
func populateUnprocessedNews(engine *xorm.Engine) error {
for {
var res []*FeedItem
err := engine.SQL(`select id, feed_id from feed_item as y where y.Id not in (select news_item_id from data_point) and y.Id not in (select news_item_id from process_queue) LIMIT 200`).Find(&res)
if err != nil {
return err
}
if len(res) == 0 {
break
}
var b []*ProcessQueue
for _, r := range res {
b = append(b, &ProcessQueue{FeedItemId: r.FeedId, NewsItemId: r.Id})
}
if _, err := engine.Insert(b); err != nil {
return err
}
}
return nil
}