-
Notifications
You must be signed in to change notification settings - Fork 3
/
delivery.go
254 lines (227 loc) · 6.73 KB
/
delivery.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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
package repository
import (
"bytes"
"context"
"crypto/hmac"
"crypto/sha256"
"database/sql"
"encoding/hex"
"net/http"
"net/http/httputil"
"time"
"github.com/allisson/postmand"
"github.com/google/uuid"
"github.com/jmoiron/sqlx"
"github.com/jpillora/backoff"
)
type dispatchResponse struct {
RawRequest string
RawResponse string
ResponseStatusCode int
ExecutionDuration int
Success bool
Error string
}
func dispatchToURL(webhook *postmand.Webhook, delivery *postmand.Delivery) dispatchResponse {
dr := dispatchResponse{}
// Prepare request
httpClient := &http.Client{Timeout: time.Duration(webhook.DeliveryAttemptTimeout) * time.Second}
request, err := http.NewRequest("POST", webhook.URL, bytes.NewBufferString(delivery.Payload))
if err != nil {
dr.Success = false
dr.Error = err.Error()
return dr
}
request.Header.Set("Content-Type", webhook.ContentType)
if webhook.SecretToken != "" {
hash := hmac.New(sha256.New, []byte(webhook.SecretToken))
_, err := hash.Write([]byte(delivery.Payload))
if err != nil {
dr.Success = false
dr.Error = err.Error()
return dr
}
request.Header.Set("X-Hub-Signature", hex.EncodeToString(hash.Sum(nil)))
}
// Create request dump
requestDump, err := httputil.DumpRequest(request, true)
if err != nil {
dr.Success = false
dr.Error = err.Error()
return dr
}
// Make request
start := time.Now()
response, err := httpClient.Do(request)
if err != nil {
dr.Success = false
dr.Error = err.Error()
return dr
}
latency := time.Since(start)
// Create response dump
responseDump, err := httputil.DumpResponse(response, true)
if err != nil {
dr.Success = false
dr.Error = err.Error()
return dr
}
// Verify response status code
success := false
for _, statusCode := range webhook.ValidStatusCodes {
if response.StatusCode == int(statusCode) {
success = true
}
}
// Update dispatch response
dr.RawRequest = string(requestDump)
dr.RawResponse = string(responseDump)
dr.ResponseStatusCode = response.StatusCode
dr.ExecutionDuration = int(latency.Milliseconds())
dr.Success = success
return dr
}
// Delivery implements postmand.DeliveryRepository interface.
type Delivery struct {
db *sqlx.DB
}
// Get returns postmand.Delivery by options filter.
func (d Delivery) Get(ctx context.Context, getOptions postmand.RepositoryGetOptions) (*postmand.Delivery, error) {
delivery := postmand.Delivery{}
query, args := getQuery("deliveries", getOptions)
err := d.db.GetContext(ctx, &delivery, query, args...)
if err == sql.ErrNoRows {
return &delivery, postmand.ErrDeliveryNotFound
}
return &delivery, err
}
// List returns a slice of postmand.Delivery by options filter.
func (d Delivery) List(ctx context.Context, listOptions postmand.RepositoryListOptions) ([]*postmand.Delivery, error) {
deliveries := []*postmand.Delivery{}
query, args := listQuery("deliveries", listOptions)
err := d.db.SelectContext(ctx, &deliveries, query, args...)
return deliveries, err
}
// Create postmand.Delivery on database.
func (d Delivery) Create(ctx context.Context, delivery *postmand.Delivery) error {
query, args := insertQuery("deliveries", delivery)
_, err := d.db.ExecContext(ctx, query, args...)
return err
}
// Update postmand.Delivery on database.
func (d Delivery) Update(ctx context.Context, delivery *postmand.Delivery) error {
query, args := updateQuery("deliveries", delivery.ID, delivery)
_, err := d.db.ExecContext(ctx, query, args...)
return err
}
// Delete postmand.Delivery on database.
func (d Delivery) Delete(ctx context.Context, id postmand.ID) error {
query := `
DELETE FROM deliveries WHERE id = $1
`
_, err := d.db.ExecContext(ctx, query, id)
return err
}
// Dispatch fetchs a delivery and send to url destination.
func (d Delivery) Dispatch(ctx context.Context) (*postmand.DeliveryAttempt, error) {
query := `
SELECT
deliveries.*
FROM
deliveries
INNER JOIN webhooks
ON deliveries.webhook_id = webhooks.id
WHERE
webhooks.active = true AND deliveries.status = $1 AND deliveries.scheduled_at <= $2
ORDER BY
deliveries.created_at ASC
FOR UPDATE SKIP LOCKED
LIMIT
1
`
// Starts a new transaction
tx, err := d.db.Beginx()
if err != nil {
return nil, err
}
// Get delivery
delivery := postmand.Delivery{}
err = tx.GetContext(ctx, &delivery, query, postmand.DeliveryStatusPending, time.Now().UTC())
if err != nil {
// Skip if no result
if err == sql.ErrNoRows {
rollback("delivery not found", tx)
return nil, nil
}
rollback("get delivery", tx)
return nil, err
}
// Get webhook
webhook := postmand.Webhook{}
getOptions := postmand.RepositoryGetOptions{Filters: map[string]interface{}{"id": delivery.WebhookID}}
sql, args := getQuery("webhooks", getOptions)
err = tx.GetContext(ctx, &webhook, sql, args...)
if err != nil {
rollback("get webhook", tx)
return nil, err
}
// Dispatch webhook
dr := dispatchToURL(&webhook, &delivery)
// Update delivery
newDeliveryAttempts := delivery.DeliveryAttempts + 1
newStatus := postmand.DeliveryStatusPending
newScheduledAt := delivery.ScheduledAt
if dr.Success {
newStatus = postmand.DeliveryStatusSucceeded
} else {
if newDeliveryAttempts >= webhook.MaxDeliveryAttempts {
newStatus = postmand.DeliveryStatusFailed
} else {
b := &backoff.Backoff{
Min: time.Duration(webhook.RetryMinBackoff) * time.Second,
Max: time.Duration(webhook.RetryMaxBackoff) * time.Second,
Factor: 2,
Jitter: false,
}
newScheduledAt = time.Now().UTC().Add(b.ForAttempt(float64(delivery.DeliveryAttempts)))
}
}
delivery.DeliveryAttempts = newDeliveryAttempts
delivery.Status = newStatus
delivery.ScheduledAt = newScheduledAt
delivery.UpdatedAt = time.Now().UTC()
query, args = updateQuery("deliveries", delivery.ID, delivery)
_, err = tx.ExecContext(ctx, query, args...)
if err != nil {
rollback("update delivery", tx)
return nil, err
}
// Create delivery attempt
deliveryAttempt := postmand.DeliveryAttempt{
ID: uuid.New(),
WebhookID: webhook.ID,
DeliveryID: delivery.ID,
RawRequest: dr.RawRequest,
RawResponse: dr.RawResponse,
ResponseStatusCode: dr.ResponseStatusCode,
ExecutionDuration: dr.ExecutionDuration,
Success: dr.Success,
Error: dr.Error,
CreatedAt: time.Now().UTC(),
}
query, args = insertQuery("delivery_attempts", deliveryAttempt)
_, err = tx.ExecContext(ctx, query, args...)
if err != nil {
rollback("create delivery attempt", tx)
return nil, err
}
if err := tx.Commit(); err != nil {
rollback("unable to commit", tx)
return nil, err
}
return &deliveryAttempt, nil
}
// NewDelivery will create an implementation of postmand.DeliveryRepository.
func NewDelivery(db *sqlx.DB) *Delivery {
return &Delivery{db: db}
}