github.com/axw/juju@v0.0.0-20161005053422-4bd6544d08d4/state/statetest/persistence_stubs.go (about)

     1  // Copyright 2015 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package statetest
     5  
     6  import (
     7  	"reflect"
     8  
     9  	"github.com/juju/errors"
    10  	"github.com/juju/testing"
    11  	jujutxn "github.com/juju/txn"
    12  	"gopkg.in/mgo.v2/txn"
    13  )
    14  
    15  type StubPersistence struct {
    16  	*testing.Stub
    17  
    18  	RunFunc func(jujutxn.TransactionSource) error
    19  
    20  	ReturnAll interface{} // homegenous(?) list of doc struct (not pointers)
    21  	ReturnOne interface{} // a doc struct (not a pointer)
    22  
    23  	ReturnApplicationExistsOps       []txn.Op
    24  	ReturnIncCharmModifiedVersionOps []txn.Op
    25  	ReturnNewCleanupOp               *txn.Op
    26  }
    27  
    28  func NewStubPersistence(stub *testing.Stub) *StubPersistence {
    29  	s := &StubPersistence{
    30  		Stub: stub,
    31  	}
    32  	s.RunFunc = s.run
    33  	return s
    34  }
    35  
    36  func (s *StubPersistence) One(collName, id string, doc interface{}) error {
    37  	s.AddCall("One", collName, id, doc)
    38  	if err := s.NextErr(); err != nil {
    39  		return errors.Trace(err)
    40  	}
    41  
    42  	if reflect.TypeOf(s.ReturnOne) == nil {
    43  		return errors.NotFoundf("resource")
    44  	}
    45  	ptr := reflect.ValueOf(doc)
    46  	newVal := reflect.ValueOf(s.ReturnOne)
    47  	ptr.Elem().Set(newVal)
    48  	return nil
    49  }
    50  
    51  func (s *StubPersistence) All(collName string, query, docs interface{}) error {
    52  	s.AddCall("All", collName, query, docs)
    53  	if err := s.NextErr(); err != nil {
    54  		return errors.Trace(err)
    55  	}
    56  
    57  	ptr := reflect.ValueOf(docs)
    58  	if reflect.TypeOf(s.ReturnAll) == nil {
    59  		ptr.Elem().SetLen(0)
    60  	} else {
    61  		newVal := reflect.ValueOf(s.ReturnAll)
    62  		ptr.Elem().Set(newVal)
    63  	}
    64  	return nil
    65  }
    66  
    67  func (s *StubPersistence) Run(buildTxn jujutxn.TransactionSource) error {
    68  	s.AddCall("Run", buildTxn)
    69  	if err := s.NextErr(); err != nil {
    70  		return errors.Trace(err)
    71  	}
    72  
    73  	if err := s.run(buildTxn); err != nil {
    74  		return errors.Trace(err)
    75  	}
    76  
    77  	return nil
    78  }
    79  
    80  // See github.com/juju/txn.transactionRunner.Run.
    81  func (s *StubPersistence) run(buildTxn jujutxn.TransactionSource) error {
    82  	for i := 0; ; i++ {
    83  		ops, err := buildTxn(i)
    84  		if errors.Cause(err) == jujutxn.ErrTransientFailure {
    85  			continue
    86  		}
    87  		if errors.Cause(err) == jujutxn.ErrNoOperations {
    88  			return nil
    89  		}
    90  		if err != nil {
    91  			return err
    92  		}
    93  
    94  		err = s.RunTransaction(ops)
    95  		if errors.Cause(err) == txn.ErrAborted {
    96  			continue
    97  		}
    98  		return err
    99  	}
   100  }
   101  
   102  func (s *StubPersistence) RunTransaction(ops []txn.Op) error {
   103  	s.AddCall("RunTransaction", ops)
   104  	if err := s.NextErr(); err != nil {
   105  		return errors.Trace(err)
   106  	}
   107  
   108  	return nil
   109  }
   110  
   111  func (s *StubPersistence) ApplicationExistsOps(serviceID string) []txn.Op {
   112  	s.AddCall("ApplicationExistsOps", serviceID)
   113  	// pop off an error so num errors == num calls, even though this call
   114  	// doesn't actually use the error.
   115  	s.NextErr()
   116  
   117  	return s.ReturnApplicationExistsOps
   118  }
   119  
   120  func (s *StubPersistence) IncCharmModifiedVersionOps(serviceID string) []txn.Op {
   121  	s.AddCall("IncCharmModifiedVersionOps", serviceID)
   122  	// pop off an error so num errors == num calls, even though this call
   123  	// doesn't actually use the error.
   124  	s.NextErr()
   125  
   126  	return s.ReturnIncCharmModifiedVersionOps
   127  }
   128  
   129  func (s *StubPersistence) NewCleanupOp(kind, prefix string) txn.Op {
   130  	s.AddCall("NewCleanupOp", kind, prefix)
   131  	// pop off an error so num errors == num calls, even though this call
   132  	// doesn't actually use the error.
   133  	s.NextErr()
   134  
   135  	return *s.ReturnNewCleanupOp
   136  }