-
Notifications
You must be signed in to change notification settings - Fork 158
/
cloudformation.go
207 lines (174 loc) · 6.37 KB
/
cloudformation.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
// Package cloudformation provides a server for the CloudFormation interface to
// Empire.
package cloudformation
import (
"database/sql"
"encoding/json"
"fmt"
"time"
"golang.org/x/net/context"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/client"
"github.com/aws/aws-sdk-go/service/ecs"
"github.com/aws/aws-sdk-go/service/sqs"
"github.com/remind101/empire/pkg/cloudformation/customresources"
"github.com/remind101/empire/scheduler/ecs/lb"
"github.com/remind101/pkg/logger"
"github.com/remind101/pkg/reporter"
)
var (
// Allow custom resource provisioners this amount of time do their
// thing.
ProvisioningTimeout = time.Duration(20 * time.Minute)
// And this amount of time to cleanup when they're canceled.
ProvisioningGraceTimeout = time.Duration(1 * time.Minute)
)
// Represents the body of the SQS message, which would have been received from
// SNS.
type Message struct {
Message string `json:"Message"`
}
// sqsClient duck types the sqs.SQS interface.
type sqsClient interface {
ReceiveMessage(*sqs.ReceiveMessageInput) (*sqs.ReceiveMessageOutput, error)
DeleteMessage(*sqs.DeleteMessageInput) (*sqs.DeleteMessageOutput, error)
}
// CustomResourceProvisioner polls for CloudFormation Custom Resource requests
// from an sqs queue, provisions them, then responds back.
type CustomResourceProvisioner struct {
// Root context.Context to use. If a reporter.Reporter is embedded,
// errors generated will be reporter there. If a logger.Logger is
// embedded, logging will be logged there.
Context context.Context
// The SQS queue url to listen for CloudFormation Custom Resource
// requests.
QueueURL string
// Provisioners routes a custom resource to the thing that should do the
// provisioning.
Provisioners map[string]customresources.Provisioner
sendResponse func(customresources.Request, customresources.Response) error
sqs sqsClient
}
// NewCustomResourceProvisioner returns a new CustomResourceProvisioner with an
// sqs client configured from config.
func NewCustomResourceProvisioner(db *sql.DB, config client.ConfigProvider) *CustomResourceProvisioner {
p := &CustomResourceProvisioner{
Provisioners: make(map[string]customresources.Provisioner),
sendResponse: customresources.SendResponse,
sqs: sqs.New(config),
}
p.add("Custom::InstancePort", &InstancePortsProvisioner{
ports: lb.NewDBPortAllocator(db),
})
p.add("Custom::ECSService", &ECSServiceResource{
ecs: ecs.New(config),
})
return p
}
// add adds a custom resource provisioner.
func (c *CustomResourceProvisioner) add(resourceName string, p customresources.Provisioner) {
// Wrap the provisioner with timeouts.
p = customresources.WithTimeout(p, ProvisioningTimeout, ProvisioningGraceTimeout)
c.Provisioners[resourceName] = p
}
// Start starts pulling requests from the queue and provisioning them.
func (c *CustomResourceProvisioner) Start() {
t := time.Tick(10 * time.Second)
for range t {
ctx := c.Context
resp, err := c.sqs.ReceiveMessage(&sqs.ReceiveMessageInput{
QueueUrl: aws.String(c.QueueURL),
})
if err != nil {
reporter.Report(ctx, err)
continue
}
for _, m := range resp.Messages {
go func(m *sqs.Message) {
if err := c.handle(ctx, m); err != nil {
reporter.Report(ctx, err)
}
}(m)
}
}
}
func (c *CustomResourceProvisioner) handle(ctx context.Context, message *sqs.Message) error {
err := c.Handle(ctx, message)
if err == nil {
_, err = c.sqs.DeleteMessage(&sqs.DeleteMessageInput{
QueueUrl: aws.String(c.QueueURL),
ReceiptHandle: message.ReceiptHandle,
})
}
return err
}
// Handle handles a single sqs.Message to perform the provisioning.
func (c *CustomResourceProvisioner) Handle(ctx context.Context, message *sqs.Message) error {
var m Message
err := json.Unmarshal([]byte(*message.Body), &m)
if err != nil {
return fmt.Errorf("error unmarshalling sqs message body: %v", err)
}
var req customresources.Request
err = json.Unmarshal([]byte(m.Message), &req)
if err != nil {
return fmt.Errorf("error unmarshalling to cloudformation request: %v", err)
}
resp := customresources.NewResponseFromRequest(req)
// CloudFormation is weird. PhysicalResourceId is required when creating
// a resource, but if the creation fails, how would we have a physical
// resource id? In cases where a Create request fails, we set the
// physical resource id to `failed/Create`. When a delete request comes
// in to delete that resource, we just send back a SUCCESS response so
// CloudFormation is happy.
if req.RequestType == customresources.Delete && req.PhysicalResourceId == fmt.Sprintf("failed/%s", customresources.Create) {
resp.PhysicalResourceId = req.PhysicalResourceId
} else {
resp.PhysicalResourceId, resp.Data, err = c.provision(ctx, m, req)
}
// Allow provisioners to just return "" to indicate that the physical
// resource id did not change.
if resp.PhysicalResourceId == "" && req.PhysicalResourceId != "" {
resp.PhysicalResourceId = req.PhysicalResourceId
}
switch err {
case nil:
resp.Status = customresources.StatusSuccess
logger.Info(ctx, "cloudformation.provision",
"request", req,
"response", resp,
)
default:
// A physical resource id is required, so if a Create request
// fails, and there's no physical resource id, CloudFormation
// will only say `Invalid PhysicalResourceId` in the status
// Reason instead of the actual error that caused the Create to
// fail.
if req.RequestType == customresources.Create && resp.PhysicalResourceId == "" {
resp.PhysicalResourceId = fmt.Sprintf("failed/%s", req.RequestType)
}
resp.Status = customresources.StatusFailed
resp.Reason = err.Error()
logger.Error(ctx, "cloudformation.provision.error",
"request", req,
"response", resp,
"err", err.Error(),
)
}
return c.sendResponse(req, resp)
}
func (c *CustomResourceProvisioner) provision(ctx context.Context, m Message, req customresources.Request) (string, interface{}, error) {
p, ok := c.Provisioners[req.ResourceType]
if !ok {
return "", nil, fmt.Errorf("no provisioner for %v", req.ResourceType)
}
// If the provisioner defines a type for the properties, let's unmarhsal
// into that Go type.
req.ResourceProperties = p.Properties()
req.OldResourceProperties = p.Properties()
err := json.Unmarshal([]byte(m.Message), &req)
if err != nil {
return "", nil, fmt.Errorf("error unmarshalling to cloudformation request: %v", err)
}
return p.Provision(ctx, req)
}