github.com/isi-lincoln/grab@v2.0.1-0.20200331080741-9f014744ee41+incompatible/example_request_test.go (about)

     1  package grab
     2  
     3  import (
     4  	"context"
     5  	"crypto/sha256"
     6  	"encoding/hex"
     7  	"fmt"
     8  	"time"
     9  )
    10  
    11  func ExampleRequest_WithContext() {
    12  	// create context with a 100ms timeout
    13  	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
    14  	defer cancel()
    15  
    16  	// create download request with context
    17  	req, err := NewRequest("", "http://example.com/example.zip")
    18  	if err != nil {
    19  		panic(err)
    20  	}
    21  	req = req.WithContext(ctx)
    22  
    23  	// send download request
    24  	resp := DefaultClient.Do(req)
    25  	if err := resp.Err(); err != nil {
    26  		fmt.Println("error: request cancelled")
    27  	}
    28  
    29  	// Output:
    30  	// error: request cancelled
    31  }
    32  
    33  func ExampleRequest_SetChecksum() {
    34  	// create download request
    35  	req, err := NewRequest("", "http://example.com/example.zip")
    36  	if err != nil {
    37  		panic(err)
    38  	}
    39  
    40  	// set request checksum
    41  	sum, err := hex.DecodeString("33daf4c03f86120fdfdc66bddf6bfff4661c7ca11c5da473e537f4d69b470e57")
    42  	if err != nil {
    43  		panic(err)
    44  	}
    45  	req.SetChecksum(sha256.New(), sum, true)
    46  
    47  	// download and validate file
    48  	resp := DefaultClient.Do(req)
    49  	if err := resp.Err(); err != nil {
    50  		panic(err)
    51  	}
    52  }