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http_multipart_request.go
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http_multipart_request.go
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package main
import (
"bytes"
"io"
"log"
"mime/multipart"
"net/http"
"net/http/httptest"
"os"
"path/filepath"
source "github.com/zyreio/parquet-go-source/http"
"github.com/zyreio/parquet-go/reader"
)
type Student struct {
Name string `parquet:"name=name, type=UTF8"`
Age int32 `parquet:"name=age, type=INT32"`
Id int64 `parquet:"name=id, type=INT64"`
Weight float32 `parquet:"name=weight, type=FLOAT"`
Sex bool `parquet:"name=sex, type=BOOLEAN"`
}
func main() {
path := "flat.parquet.snappy"
file, err := os.Open(path)
if err != nil {
log.Fatal(err)
}
defer file.Close()
// create sample request
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
part, err := writer.CreateFormFile("parquet_file", filepath.Base(path))
if err != nil {
log.Fatal(err)
}
_, err = io.Copy(part, file)
err = writer.Close()
if err != nil {
log.Fatal(err)
}
req := httptest.NewRequest(http.MethodPost, "/upload", body)
req.Header.Set("Content-Type", writer.FormDataContentType())
// parse request body
reqFile, fileHeader, err := req.FormFile("parquet_file")
if err != nil {
log.Fatal(err)
}
defer reqFile.Close()
// create readers
fr := source.NewMultipartFileWrapper(fileHeader, reqFile)
pr, err := reader.NewParquetReader(fr, new(Student), 4)
if err != nil {
log.Fatal(err)
}
defer pr.ReadStop()
// read contents
num := int(pr.GetNumRows())
for i := 0; i < num; i++ {
stus := make([]Student, 1)
if err = pr.Read(&stus); err != nil {
log.Println("Read error", err)
}
log.Println(stus)
}
}