github.com/Schaudge/grailbase@v0.0.0-20240223061707-44c758a471c0/file/example_localfile_test.go (about)

     1  package file_test
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  	"io/ioutil"
     7  
     8  	"github.com/Schaudge/grailbase/file"
     9  )
    10  
    11  // Example_localfile is an example of basic read/write operations on the local
    12  // file system.
    13  func Example_localfile() {
    14  	doWrite := func(ctx context.Context, data []byte, path string) {
    15  		out, err := file.Create(ctx, path)
    16  		if err != nil {
    17  			panic(err)
    18  		}
    19  		if _, err = out.Writer(ctx).Write(data); err != nil {
    20  			panic(err)
    21  		}
    22  		if err := out.Close(ctx); err != nil {
    23  			panic(err)
    24  		}
    25  	}
    26  
    27  	doRead := func(ctx context.Context, path string) []byte {
    28  		in, err := file.Open(ctx, path)
    29  		if err != nil {
    30  			panic(err)
    31  		}
    32  		data, err := ioutil.ReadAll(in.Reader(ctx))
    33  		if err != nil {
    34  			panic(err)
    35  		}
    36  		if err := in.Close(ctx); err != nil {
    37  			panic(err)
    38  		}
    39  		return data
    40  	}
    41  
    42  	ctx := context.Background()
    43  	doWrite(ctx, []byte("Blue box jumped over red bat"), "/tmp/foohah.txt")
    44  	fmt.Printf("Got: %s\n", string(doRead(ctx, "/tmp/foohah.txt")))
    45  	// Output:
    46  	// Got: Blue box jumped over red bat
    47  }