github.com/Schaudge/grailbase@v0.0.0-20240223061707-44c758a471c0/file/s3file/s3transport/dns_test.go (about)

     1  package s3transport
     2  
     3  import (
     4  	"fmt"
     5  	"net"
     6  	"testing"
     7  	"time"
     8  
     9  	"github.com/stretchr/testify/assert"
    10  )
    11  
    12  func TestResolver(t *testing.T) {
    13  	var (
    14  		gotHost   string
    15  		stubIP    []net.IP
    16  		stubError error
    17  		stubNow   time.Time
    18  	)
    19  	stubLookupIP := func(host string) ([]net.IP, error) {
    20  		gotHost = host
    21  		return stubIP, stubError
    22  	}
    23  	r := newResolver(stubLookupIP, func() time.Time { return stubNow })
    24  
    25  	stubIP, stubError = []net.IP{{1, 2, 3, 4}, {10, 20, 30, 40}}, nil
    26  	stubNow = time.Unix(1600000000, 0)
    27  	gotIP, gotError := r.LookupIP("s3.example.com")
    28  	assert.Equal(t, "s3.example.com", gotHost)
    29  	assert.NoError(t, gotError)
    30  	assert.Equal(t, []net.IP{{1, 2, 3, 4}, {10, 20, 30, 40}}, gotIP)
    31  
    32  	stubIP, stubError = nil, fmt.Errorf("stub err")
    33  	stubNow = stubNow.Add(dnsCacheTime - 1)
    34  	gotHost = "should not be called"
    35  	gotIP, gotError = r.LookupIP("s3.example.com")
    36  	assert.Equal(t, "should not be called", gotHost)
    37  	assert.NoError(t, gotError)
    38  	assert.Equal(t, []net.IP{{1, 2, 3, 4}, {10, 20, 30, 40}}, gotIP)
    39  
    40  	stubIP, stubError = []net.IP{{5, 6, 7, 8}}, nil
    41  	gotIP, gotError = r.LookupIP("s3-us-west-2.example.com")
    42  	assert.Equal(t, "s3-us-west-2.example.com", gotHost)
    43  	assert.NoError(t, gotError)
    44  	assert.Equal(t, []net.IP{{5, 6, 7, 8}}, gotIP)
    45  
    46  	stubIP, stubError = []net.IP{{21, 22, 23, 24}}, nil
    47  	gotHost = ""
    48  	stubNow = stubNow.Add(2)
    49  	gotIP, gotError = r.LookupIP("s3.example.com")
    50  	assert.Equal(t, "s3.example.com", gotHost)
    51  	assert.NoError(t, gotError)
    52  	assert.Equal(t, []net.IP{{21, 22, 23, 24}}, gotIP)
    53  }