github.com/thiagoyeds/go-cloud@v0.26.0/server/health/sqlhealth/sqlhealth_test.go (about)

     1  // Copyright 2018 The Go Cloud Development Kit Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     https://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package sqlhealth
    16  
    17  import (
    18  	"context"
    19  	"database/sql"
    20  	"database/sql/driver"
    21  	"errors"
    22  	"sync"
    23  	"testing"
    24  
    25  	"gocloud.dev/server/health"
    26  )
    27  
    28  var _ = health.Checker((*Checker)(nil))
    29  
    30  func TestCheck(t *testing.T) {
    31  	connector := new(stubConnector)
    32  	db := sql.OpenDB(connector)
    33  	defer db.Close()
    34  
    35  	check := New(db)
    36  	defer check.Stop()
    37  	if err := check.CheckHealth(); err == nil {
    38  		t.Error("checker starts healthy")
    39  	}
    40  	connector.setHealthy(true)
    41  
    42  	// Should eventually become healthy. Otherwise, stopped by test timeout.
    43  	for {
    44  		if err := check.CheckHealth(); err == nil {
    45  			break
    46  		}
    47  	}
    48  }
    49  
    50  type stubConnector struct {
    51  	mu      sync.RWMutex
    52  	healthy bool
    53  }
    54  
    55  func (c *stubConnector) setHealthy(h bool) {
    56  	c.mu.Lock()
    57  	c.healthy = h
    58  	c.mu.Unlock()
    59  }
    60  
    61  func (c *stubConnector) Connect(ctx context.Context) (driver.Conn, error) {
    62  	return &stubConn{c}, nil
    63  }
    64  
    65  func (c *stubConnector) Driver() driver.Driver {
    66  	return nil
    67  }
    68  
    69  type stubConn struct {
    70  	c *stubConnector
    71  }
    72  
    73  func (conn *stubConn) Prepare(query string) (driver.Stmt, error) {
    74  	panic("not implemented")
    75  }
    76  
    77  func (conn *stubConn) Close() error {
    78  	return nil
    79  }
    80  
    81  func (conn *stubConn) Begin() (driver.Tx, error) {
    82  	panic("not implemented")
    83  }
    84  
    85  func (conn *stubConn) Ping(ctx context.Context) error {
    86  	conn.c.mu.RLock()
    87  	healthy := conn.c.healthy
    88  	conn.c.mu.RUnlock()
    89  	if !healthy {
    90  		return errors.New("unhealthy")
    91  	}
    92  	return nil
    93  }