/
reader.go
66 lines (51 loc) · 1.79 KB
/
reader.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
/*
Copyright © 2023 Aleksander Wojnarowicz <alwojnarowicz@gmail.com>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package reader
import (
"log"
"sync"
"github.com/go-gota/gota/dataframe"
)
type DataReader interface {
getName() string
getSymbols() []string
readSingle(symbol string) (dataframe.DataFrame, error)
concatDataframes(dfs []dataframe.DataFrame) dataframe.DataFrame
}
var DefaultHeaders = map[string]string{
"Connection": "keep-alive",
"Expires": "-1",
"Upgrade-Insecure-Requests": "1",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36",
}
func GetData(reader DataReader) dataframe.DataFrame {
symbols := reader.getSymbols()
results := make([]dataframe.DataFrame, 0, len(symbols))
var wg sync.WaitGroup
log.Printf("Scraping data from '%s'", reader.getName())
for _, symbol := range symbols {
wg.Add(1)
go func(symbol string) {
defer wg.Done()
singleDf, err := reader.readSingle(symbol)
if err != nil {
log.Printf("[ERROR] [%s] [%s] - %s", reader.getName(), symbol, err)
return
}
results = append(results, singleDf)
}(symbol)
}
wg.Wait()
log.Printf("Finished scraping data from '%s'", reader.getName())
return reader.concatDataframes(results)
}