ianmcook commented on code in PR #39081:
URL: https://github.com/apache/arrow/pull/39081#discussion_r1432960164
##########
http/examples/get/server.go:
##########
@@ -0,0 +1,98 @@
+package main
+
+import (
+ "fmt"
+ "log"
+ "math/rand"
+ "net/http"
+
+ "github.com/apache/arrow/go/v15/arrow"
+ "github.com/apache/arrow/go/v15/arrow/array"
+ "github.com/apache/arrow/go/v15/arrow/ipc"
+ "github.com/apache/arrow/go/v15/arrow/memory"
+)
+
+var schema = arrow.NewSchema([]arrow.Field{
+ {Name: "a", Type: arrow.PrimitiveTypes.Int64},
+ {Name: "b", Type: arrow.PrimitiveTypes.Int64},
+ {Name: "c", Type: arrow.PrimitiveTypes.Int64},
+ {Name: "d", Type: arrow.PrimitiveTypes.Int64},
+}, nil)
+
+func GetPutData() []arrow.Record {
+ const (
+ totalRecords = 100000000
+ length = 4096
+ ncolumns = 4
+ seed = 42
+ )
+
+ var (
+ r = rand.New(rand.NewSource(seed))
+ mem = memory.DefaultAllocator
+ arrs = make([]arrow.Array, 0, ncolumns)
+ )
+ for i := 0; i < ncolumns; i++ {
+ buf := memory.NewResizableBuffer(mem)
+ buf.Resize(length * 8)
+ _, err := r.Read(buf.Buf())
+ if err != nil {
+ panic(err)
+ }
+ defer buf.Release()
+
+ data := array.NewData(arrow.PrimitiveTypes.Int64, length,
[]*memory.Buffer{nil, buf}, nil, 0, 0)
+ defer data.Release()
+ a := array.NewInt64Data(data)
+ defer a.Release()
+ arrs = append(arrs, a)
+ }
+
+ batch := array.NewRecord(schema, arrs, length)
+ defer batch.Release()
+
+ batches := make([]arrow.Record, 0)
+ records := 0
+ for records < totalRecords {
+ if records+length > totalRecords {
+ lastLen := totalRecords - records
+ batches = append(batches, batch.NewSlice(0, lastLen))
+ records += lastLen
+ } else {
+ batch.Retain()
+ batches = append(batches, batch)
+ }
+ }
+
+ return batches
+}
+
+func main() {
+ batches := GetPutData()
+
+ http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+ hdrs := w.Header()
+ hdrs.Add("access-control-allow-origin", "http://localhost:8080";)
+ hdrs.Add("access-control-allow-methods", "GET")
+ hdrs.Add("access-control-allow-headers", "content-type")
+ if r.Method != http.MethodGet {
+ w.WriteHeader(http.StatusBadRequest)
+ return
+ }
+
+ hdrs.Add("content-type", "application/vnd.apache.arrow.stream")
+ w.WriteHeader(http.StatusOK)
+
+ wr := ipc.NewWriter(w, ipc.WithSchema(batches[0].Schema()))
+ defer wr.Close()
+
+ for _, b := range batches {
+ if err := wr.Write(b); err != nil {
+ panic(err)
+ }
+ }
+ })
+
+ fmt.Println("Serving on localhost:8080...")
+ log.Fatal(http.ListenAndServe(":8080", nil))
Review Comment:
```suggestion
fmt.Println("Serving on localhost:8000...")
log.Fatal(http.ListenAndServe(":8000", nil))
```
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