updates.go

Documentation: github.com/go-kivik/kivik/v4/kiviktest/client

     1  // Licensed under the Apache License, Version 2.0 (the "License"); you may not
     2  // use this file except in compliance with the License. You may obtain a copy of
     3  // the License at
     4  //
     5  //  http://www.apache.org/licenses/LICENSE-2.0
     6  //
     7  // Unless required by applicable law or agreed to in writing, software
     8  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     9  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    10  // License for the specific language governing permissions and limitations under
    11  // the License.
    12  
    13  package client
    14  
    15  import (
    16  	"context"
    17  	"fmt"
    18  	"time"
    19  
    20  	kivik "github.com/go-kivik/kivik/v4"
    21  	"github.com/go-kivik/kivik/v4/kiviktest/kt"
    22  )
    23  
    24  func init() {
    25  	kt.Register("DBUpdates", updates)
    26  }
    27  
    28  func updates(ctx *kt.Context) {
    29  	ctx.RunRW(func(ctx *kt.Context) {
    30  		ctx.RunAdmin(func(ctx *kt.Context) {
    31  			testUpdates(ctx, ctx.Admin)
    32  		})
    33  		ctx.RunNoAuth(func(ctx *kt.Context) {
    34  			testUpdates(ctx, ctx.NoAuth)
    35  		})
    36  	})
    37  }
    38  
    39  const maxWait = 5 * time.Second
    40  
    41  func testUpdates(ctx *kt.Context, client *kivik.Client) {
    42  	ctx.Parallel()
    43  	updates := client.DBUpdates(context.TODO())
    44  	if !ctx.IsExpectedSuccess(updates.Err()) {
    45  		return
    46  	}
    47  	// It seems that DBUpdates doesn't always start responding immediately,
    48  	// so introduce a small delay to ensure we're reporting updates before we
    49  	// actually do the updates.
    50  	const delay = 10 * time.Millisecond
    51  	time.Sleep(delay)
    52  	dbname := ctx.TestDBName()
    53  	eventErrors := make(chan error)
    54  	go func() {
    55  		for updates.Next() {
    56  			if updates.DBName() == dbname {
    57  				if updates.Type() == "created" {
    58  					break
    59  				}
    60  				eventErrors <- fmt.Errorf("Unexpected event type '%s'", updates.Type())
    61  			}
    62  		}
    63  		eventErrors <- updates.Err()
    64  		close(eventErrors)
    65  	}()
    66  	ctx.T.Cleanup(func() { ctx.DestroyDB(dbname) })
    67  	if err := ctx.Admin.CreateDB(context.Background(), dbname, ctx.Options("db")); err != nil {
    68  		ctx.Fatalf("Failed to create db: %s", err)
    69  	}
    70  	timer := time.NewTimer(maxWait)
    71  	select {
    72  	case err := <-eventErrors:
    73  		if err != nil {
    74  			ctx.Fatalf("Error reading event: %s", err)
    75  		}
    76  	case <-timer.C:
    77  		ctx.Fatalf("Failed to read expected event in %s", maxWait)
    78  	}
    79  	if err := updates.Close(); err != nil {
    80  		ctx.Errorf("Updates close failed: %s", err)
    81  	}
    82  }
    83
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