forked from taggledevel2/ratchet
-
Notifications
You must be signed in to change notification settings - Fork 0
/
sql_writer.go
82 lines (72 loc) · 2.69 KB
/
sql_writer.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
package processors
import (
"database/sql"
"github.com/tsaserv/ratchet/data"
"github.com/tsaserv/ratchet/logger"
"github.com/tsaserv/ratchet/util"
)
// SQLWriter handles INSERTing data.JSON into a
// specified SQL table. If an error occurs while building
// or executing the INSERT, the error will be sent to the killChan.
//
// Note that the data.JSON must be a valid JSON object or a slice
// of valid objects, where the keys are column names and the
// the values are the SQL values to be inserted into those columns.
//
// For use-cases where a SQLWriter instance needs to write to
// multiple tables you can pass in SQLWriterData.
type SQLWriter struct {
writeDB *sql.DB
TableName string
OnDupKeyUpdate bool
OnDupKeyFields []string
ConcurrencyLevel int // See ConcurrentDataProcessor
BatchSize int
}
// SQLWriterData is a custom data structure you can send into a SQLWriter
// stage if you need to specify TableName on a per-data payload basis. No
// extra configuration is needed to use SQLWriterData, each data payload
// received is first checked for this structure before processing.
type SQLWriterData struct {
TableName string `json:"table_name"`
InsertData interface{} `json:"insert_data"`
}
// NewSQLWriter returns a new SQLWriter
func NewSQLWriter(db *sql.DB, tableName string) *SQLWriter {
return &SQLWriter{writeDB: db, TableName: tableName, OnDupKeyUpdate: true}
}
// ProcessData defers to util.SQLInsertData
func (s *SQLWriter) ProcessData(d data.JSON, outputChan chan data.JSON, killChan chan error) {
// handle panics a bit more gracefully
defer func() {
if err := recover(); err != nil {
util.KillPipelineIfErr(err.(error), killChan)
}
}()
// First check for SQLWriterData
var wd SQLWriterData
err := data.ParseJSONSilent(d, &wd)
logger.Info("SQLWriter: Writing data...")
if err == nil && wd.TableName != "" && wd.InsertData != nil {
logger.Debug("SQLWriter: SQLWriterData scenario")
dd, err := data.NewJSON(wd.InsertData)
util.KillPipelineIfErr(err, killChan)
err = util.SQLInsertData(s.writeDB, dd, wd.TableName, s.OnDupKeyUpdate, s.OnDupKeyFields, s.BatchSize)
util.KillPipelineIfErr(err, killChan)
} else {
logger.Debug("SQLWriter: normal data scenario")
err = util.SQLInsertData(s.writeDB, d, s.TableName, s.OnDupKeyUpdate, s.OnDupKeyFields, s.BatchSize)
util.KillPipelineIfErr(err, killChan)
}
logger.Info("SQLWriter: Write complete")
}
// Finish - see interface for documentation.
func (s *SQLWriter) Finish(outputChan chan data.JSON, killChan chan error) {
}
func (s *SQLWriter) String() string {
return "SQLWriter"
}
// Concurrency defers to ConcurrentDataProcessor
func (s *SQLWriter) Concurrency() int {
return s.ConcurrencyLevel
}