|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace MeadSteve\Tale; |
|
4
|
|
|
|
|
5
|
|
|
use MeadSteve\Tale\Execution\CompletedStep; |
|
6
|
|
|
use MeadSteve\Tale\Execution\Failure; |
|
7
|
|
|
use MeadSteve\Tale\Execution\Success; |
|
8
|
|
|
use MeadSteve\Tale\Execution\TransactionResult; |
|
9
|
|
|
use MeadSteve\Tale\Steps\FinalisingStep; |
|
10
|
|
|
use MeadSteve\Tale\Steps\NamedStep; |
|
11
|
|
|
use MeadSteve\Tale\Steps\Step; |
|
12
|
|
|
use Psr\Log\LoggerInterface; |
|
13
|
|
|
use Psr\Log\NullLogger; |
|
14
|
|
|
|
|
15
|
|
|
class Transaction |
|
16
|
|
|
{ |
|
17
|
|
|
/** |
|
18
|
|
|
* @var Step[] |
|
19
|
|
|
*/ |
|
20
|
|
|
private $steps = []; |
|
21
|
|
|
|
|
22
|
|
|
/** |
|
23
|
|
|
* @var LoggerInterface |
|
24
|
|
|
*/ |
|
25
|
|
|
private $logger; |
|
26
|
|
|
|
|
27
|
|
|
public function __construct(LoggerInterface $logger = null) |
|
28
|
|
|
{ |
|
29
|
|
|
if ($logger === null) { |
|
30
|
|
|
$logger = new NullLogger(); |
|
31
|
|
|
} |
|
32
|
|
|
$this->logger = $logger; |
|
33
|
|
|
} |
|
34
|
|
|
|
|
35
|
|
|
|
|
36
|
|
|
public function add(...$args): Transaction |
|
37
|
|
|
{ |
|
38
|
|
|
$step = StepBuilder::build(...$args); |
|
39
|
|
|
return $this->addStep($step); |
|
40
|
|
|
} |
|
41
|
|
|
|
|
42
|
|
|
/** |
|
43
|
|
|
* Runs each step in the transaction |
|
44
|
|
|
* |
|
45
|
|
|
* @param mixed $startingState the state to pass in to the first step |
|
46
|
|
|
* @return TransactionResult |
|
47
|
|
|
*/ |
|
48
|
|
|
public function run($startingState = null): TransactionResult |
|
49
|
|
|
{ |
|
50
|
|
|
$this->logger->debug("Running transaction"); |
|
51
|
|
|
$state = $startingState; |
|
52
|
|
|
$completedSteps = []; |
|
53
|
|
|
foreach ($this->steps as $key => $step) { |
|
54
|
|
|
try { |
|
55
|
|
|
$this->logger->debug("Executing {$this->stepName($step)} step [$key]"); |
|
56
|
|
|
$state = $step->execute($state); |
|
57
|
|
|
$completedSteps[] = new CompletedStep($step, $state, $key); |
|
58
|
|
|
$this->logger->debug("Execution of {$this->stepName($step)} step [$key] complete"); |
|
59
|
|
|
} catch (\Throwable $failure) { |
|
60
|
|
|
$this->logger->debug("Failed executing {$this->stepName($step)} step [$key]"); |
|
61
|
|
|
$this->revertCompletedSteps($completedSteps); |
|
62
|
|
|
$this->logger->debug("Finished compensating all previous steps"); |
|
63
|
|
|
return new Failure($failure); |
|
64
|
|
|
} |
|
65
|
|
|
} |
|
66
|
|
|
$this->finaliseSteps($completedSteps); |
|
67
|
|
|
return new Success($state); |
|
68
|
|
|
} |
|
69
|
|
|
|
|
70
|
|
|
private function addStep(Step $step): Transaction |
|
71
|
|
|
{ |
|
72
|
|
|
$this->logger->debug("Adding {$this->stepName($step)} to transaction definition"); |
|
73
|
|
|
$this->steps[] = $step; |
|
74
|
|
|
return $this; |
|
75
|
|
|
} |
|
76
|
|
|
|
|
77
|
|
|
/** |
|
78
|
|
|
* @param CompletedStep[] $completedSteps |
|
79
|
|
|
*/ |
|
80
|
|
|
private function revertCompletedSteps(array $completedSteps) |
|
81
|
|
|
{ |
|
82
|
|
|
foreach (array_reverse($completedSteps) as $completedStep) { |
|
83
|
|
|
$step = $completedStep->step; |
|
84
|
|
|
$stepId = $completedStep->stepId; |
|
85
|
|
|
$this->logger->debug("Compensating for step {$this->stepName($step)} [{$stepId}]"); |
|
86
|
|
|
$step->compensate($completedStep->state); |
|
87
|
|
|
$this->logger->debug("Compensation complete for step {$this->stepName($step)} [{$stepId}]"); |
|
88
|
|
|
} |
|
89
|
|
|
} |
|
90
|
|
|
|
|
91
|
|
|
/** |
|
92
|
|
|
* @param CompletedStep[] $completedSteps |
|
93
|
|
|
*/ |
|
94
|
|
|
private function finaliseSteps($completedSteps) |
|
95
|
|
|
{ |
|
96
|
|
|
foreach ($completedSteps as $completedStep) { |
|
97
|
|
|
$step = $completedStep->step; |
|
98
|
|
|
if ($step instanceof FinalisingStep) { |
|
99
|
|
|
$stepId = $completedStep->stepId; |
|
100
|
|
|
$this->logger->debug("Finalising step {$this->stepName($step)} [{$stepId}]"); |
|
101
|
|
|
$step->finalise($completedStep->state); |
|
102
|
|
|
$this->logger->debug("Finalising step {$this->stepName($step)} [{$stepId}]"); |
|
103
|
|
|
} |
|
104
|
|
|
} |
|
105
|
|
|
} |
|
106
|
|
|
|
|
107
|
|
|
private function stepName(Step $step): string |
|
108
|
|
|
{ |
|
109
|
|
|
if ($step instanceof NamedStep) { |
|
110
|
|
|
return "`{$step->stepName()}`"; |
|
111
|
|
|
} |
|
112
|
|
|
return "anonymous step"; |
|
113
|
|
|
} |
|
114
|
|
|
} |
|
115
|
|
|
|
meadsteve /
Tale
