ducky/subscriptions
ducky/subscriptions/subscription.go
Update subscription_creator to use the new strategy. When creating subscriptions through the client, detect when the returned error is saying the account already has a subscription, or the subscription already exists in stripe. Add an UpdateSubscription function that will update a subscription through the API. Update our subscription_creator listener to listen for profile creation and login verification messages. This mainly involved fixing the constants (the system, model, and topic) that the listener for profile creation was listening for. It also meant adding a new updateMessageHandler that listens for login verification, tries to create a subscription that has the user ID and email of the login that was verified, and if a subscription already exists, updates it instead to use the email address that was just verified. This will ensure that users get their receipts automatically emailed to them by Stripe.
1 package subscriptions
3 import (
4 "errors"
5 "time"
7 "code.secondbit.org/uuid.hg"
8 )
10 var (
11 // ErrSubscriptionAlreadyExists is returned when a Subscription
12 // with an identical ID already exists in the subscriptionStore.
13 ErrSubscriptionAlreadyExists = errors.New("Subscription already exists")
14 // ErrSubscriptionNotFound is returned when a single Subscription
15 // is acted upon or requested, but cannot be found.
16 ErrSubscriptionNotFound = errors.New("Subscription not found")
17 // ErrStripeSubscriptionAlreadyExists is returned when a Subscription
18 // is created or updates its StripeSubscription property, but that
19 // StripeSubscription is already associated with another Subscription.
20 ErrStripeSubscriptionAlreadyExists = errors.New("Stripe subscription already assigned to another Subscription")
21 // ErrSubscriptionChangeEmpty is returned when a SubscriptionChange
22 // is empty but is passed to subscriptionStore.UpdateSubscription
23 // anyways.
24 ErrSubscriptionChangeEmpty = errors.New("SubscriptionChange is empty")
25 // ErrNoSubscriptionID is returned when one or more Subscription IDs
26 // are required, but none are provided.
27 ErrNoSubscriptionID = errors.New("no Subscription ID provided")
29 planOptions = map[string]bool{
30 "basic_monthly": false,
31 "basic_yearly": false,
32 "supporter_monthly": false,
33 "supporter_yearly": false,
34 "free": true,
35 PendingPlan: true,
36 }
38 Version string
39 )
41 // Subscription represents the state of a user's payments. It holds
42 // metadata about the last time a user was charged, how much a user
43 // should be charged, how to charge a user and how much to charge
44 // the user.
45 type Subscription struct {
46 UserID uuid.ID `json:"user_id"`
47 StripeSubscription string `json:"stripe_subscription"`
48 Plan string `json:"plan"`
49 Status string `json:"status"`
50 Canceling bool `json:"canceling"`
51 Created time.Time `json:"created"`
52 TrialStart time.Time `json:"trial_start,omitempty"`
53 TrialEnd time.Time `json:"trial_end,omitempty"`
54 PeriodStart time.Time `json:"period_start,omitempty"`
55 PeriodEnd time.Time `json:"period_end,omitempty"`
56 CanceledAt time.Time `json:"canceled_at,omitempty"`
57 FailedChargeAttempts int `json:"failed_charge_attempts"`
58 LastFailedCharge time.Time `json:"last_failed_charge,omitempty"`
59 LastNotified time.Time `json:"last_notified,omitempty"`
60 }
62 // SubscriptionChange represents desired changes to a Subscription
63 // object. A nil value means that property should remain unchanged.
64 type SubscriptionChange struct {
65 UserID uuid.ID `json:"user_id"`
67 // User-controlled
68 StripeSource *string `json:"stripe_source,omitempty"`
69 Email *string `json:"email,omitempty"`
70 Plan *string `json:"plan,omitempty"`
71 Canceling *bool `json:"cenceling,omitempty"`
73 // System-controlled
74 StripeSubscription *string `json:"stripe_subscription,omitempty"`
75 Status *string `json:"status,omitempty"`
76 TrialStart *time.Time `json:"trial_start,omitempty"`
77 TrialEnd *time.Time `json:"trial_end,omitempty"`
78 PeriodStart *time.Time `json:"period_start,omitempty"`
79 PeriodEnd *time.Time `json:"period_end,omitempty"`
80 CanceledAt *time.Time `json:"canceled_at,omitempty"`
81 FailedChargeAttempts *int `json:"failed_charge_attempts,omitempty"`
82 LastFailedCharge *time.Time `json:"last_failed_charge,omitempty"`
83 LastNotified *time.Time `json:"last_notified,omitempty"`
84 }
86 // IsEmpty returns true if the SubscriptionChange doesn't request
87 // a change to any property of the Subscription.
88 func (change SubscriptionChange) IsEmpty() bool {
89 if change.StripeSource != nil {
90 return false
91 }
92 if change.Email != nil {
93 return false
94 }
95 if change.Plan != nil {
96 return false
97 }
98 if change.Canceling != nil {
99 return false
100 }
101 if change.StripeSubscription != nil {
102 return false
103 }
104 if change.Status != nil {
105 return false
106 }
107 if change.TrialStart != nil {
108 return false
109 }
110 if change.TrialEnd != nil {
111 return false
112 }
113 if change.PeriodStart != nil {
114 return false
115 }
116 if change.PeriodEnd != nil {
117 return false
118 }
119 if change.CanceledAt != nil {
120 return false
121 }
122 if change.LastNotified != nil {
123 return false
124 }
125 if change.LastFailedCharge != nil {
126 return false
127 }
128 if change.FailedChargeAttempts != nil {
129 return false
130 }
131 return true
132 }
134 // ApplyChange updates a Subscription based on the changes requested
135 // by a SubscriptionChange.
136 func (s *Subscription) ApplyChange(change SubscriptionChange) {
137 if change.StripeSubscription != nil {
138 s.StripeSubscription = *change.StripeSubscription
139 }
140 if change.Plan != nil {
141 s.Plan = *change.Plan
142 }
143 if change.Status != nil {
144 s.Status = *change.Status
145 }
146 if change.Canceling != nil {
147 s.Canceling = *change.Canceling
148 }
149 if change.TrialStart != nil {
150 s.TrialStart = *change.TrialStart
151 }
152 if change.TrialEnd != nil {
153 s.TrialEnd = *change.TrialEnd
154 }
155 if change.PeriodStart != nil {
156 s.PeriodStart = *change.PeriodStart
157 }
158 if change.PeriodEnd != nil {
159 s.PeriodEnd = *change.PeriodEnd
160 }
161 if change.CanceledAt != nil {
162 s.CanceledAt = *change.CanceledAt
163 }
164 if change.LastFailedCharge != nil {
165 s.LastFailedCharge = *change.LastFailedCharge
166 }
167 if change.LastNotified != nil {
168 s.LastNotified = *change.LastNotified
169 }
170 if change.FailedChargeAttempts != nil {
171 s.FailedChargeAttempts = *change.FailedChargeAttempts
172 }
173 }
175 func ChangingSystemProperties(change SubscriptionChange) []string {
176 var changes []string
177 if change.StripeSubscription != nil {
178 changes = append(changes, "/stripe_subscription")
179 }
180 if change.Status != nil {
181 changes = append(changes, "/status")
182 }
183 if change.TrialStart != nil {
184 changes = append(changes, "/trial_start")
185 }
186 if change.TrialEnd != nil {
187 changes = append(changes, "/trial_end")
188 }
189 if change.PeriodStart != nil {
190 changes = append(changes, "/period_start")
191 }
192 if change.PeriodEnd != nil {
193 changes = append(changes, "/period_end")
194 }
195 if change.CanceledAt != nil {
196 changes = append(changes, "/canceled_at")
197 }
198 if change.FailedChargeAttempts != nil {
199 changes = append(changes, "/failed_charge_attempts")
200 }
201 if change.LastFailedCharge != nil {
202 changes = append(changes, "/last_failed_charge")
203 }
204 if change.LastNotified != nil {
205 changes = append(changes, "/last_notified")
206 }
207 return changes
208 }
210 func IsAcceptablePlan(plan string, admin bool) bool {
211 for p, adminOnly := range planOptions {
212 if plan == p {
213 return admin || adminOnly == false
214 }
215 }
216 return false
217 }
219 // SubscriptionStats represents a set of statistics about our Subscription
220 // data that will be exposed to the Prometheus scraper.
221 type SubscriptionStats struct {
222 Number int64
223 Canceling int64
224 Failing int64
225 Plans map[string]int64
226 // BUG(paddy): Currently, Kubernetes doesn't offer any way to contact _all_ nodes in a service.
227 // Because of this, we can only report stats that will be identical across nodes, e.g. stats
228 // that come from the database. More info here: https://github.com/GoogleCloudPlatform/kubernetes/issues/6666
229 // In the future, we'll need per-node metrics. For now, we'll make do.
230 //
231 // Actually, as of https://github.com/GoogleCloudPlatform/kubernetes/pull/9073, we may be all set:
232 // "SRV Records are created for named ports that are part of normal or Headless Services. For each named port,
233 // the SRV record would have the form _my-port-name._my-port-protocol.my-svc.my-namespace.svc.cluster.local.
234 // For a regular service, this resolves to the port number and the CNAME: my-svc.my-namespace.svc.cluster.local.
235 // For a headless service, this resolves to multiple answers, one for each pod that is backing the service, and
236 // contains the port number and a CNAME of the pod with the format auto-generated-name.my-svc.my-namespace.svc.cluster.local
237 // SRV records always contain the 'svc' segment in them and are not supported for old-style CNAMEs where the 'svc' segment
238 // was omitted."
239 }
241 type SubscriptionStore interface {
242 Reset() error
243 CreateSubscription(sub Subscription) error
244 UpdateSubscription(id uuid.ID, change SubscriptionChange) error
245 DeleteSubscription(id uuid.ID) error
246 GetSubscriptions(ids []uuid.ID) (map[string]Subscription, error)
247 GetSubscriptionStats() (SubscriptionStats, error)
248 }