Add Mail support to limes (#667)

* prepare pending commitment job to queue mails * add mail_notification struct * add testenv * Add unit test for confirm job * fix linter * fix: add notify attribute to commitment db structure * pending: add a second commitment for the second testcase * Update internal/collector/capacity_scrape_test.go Co-authored-by: Stefan Majewsky <[email protected]> * tests: ignore first dbChange set * Update internal/core/config.go Co-authored-by: Stefan Majewsky <[email protected]> * Update internal/db/models.go Co-authored-by: Stefan Majewsky <[email protected]> * fix: next_submission_at attribute name commitment amount in the second test case * fix: createMailNotification now returns value instead of pointer * cluster: MailTemplate is now a struct mail template is now given as part of the cluster config * shorten CommitmentInfo to existing types shorten commitmentQuery by using the AZResourceLocation data * use conistent 'mail' naming * move template creation into cluster attribute * fix: make error message of failed template creation more clear * add mail_delivery_job skeleton * Add send mail job * fix: consistent table order on queue overlap * fix linter * fix license header * fix another license header * fix: add confirmed_at as ISO8601 date into the result set * add job for expiring commitments. Add TODOs * Add short-term commitment detection and unit tests * simplify key sorting for projectIDs * fix typo in comment * Add expiring mail job to collector task * update unit test comments update license headers to current year * expiring: set date after db query error check concluded add jitter to requery of failed mail deliveries * Update internal/collector/expiring_commitments.go Co-authored-by: Stefan Majewsky <[email protected]> * Update internal/collector/expiring_commitments.go Co-authored-by: Stefan Majewsky <[email protected]> * rename expiring commitment job. Add missing space to mock notification template * Update internal/collector/expiring_commitments.go Co-authored-by: Stefan Majewsky <[email protected]> * fix import in expiring commitments * declare mailinfo within its loop to avoid eventual value leak * Update internal/collector/expiring_commitments.go Co-authored-by: Stefan Majewsky <[email protected]> * Update internal/collector/mail_delivery.go Co-authored-by: Stefan Majewsky <[email protected]> * cluster: rename MailForms to mailTemplates * mail_delivery: inline mailrequest build function * mail_delivery: failed test case, expect a returned error * mail_delivery: change error interval from 24 hours to 2 minutes * inject client directly into processMailDeliveryTask * fix: expiring_commitments notice period Fix space in Duration attribute of test mail template * expiring_commitments: change discovery task to read only. Add short-term notified query into process task Fix: Bug that already notified commitments would be notified on another run Add a unit test for the case above * fix: make MailTemplate the mail method receiver. fix: add subject to mail configuration. fix: change naming scheme from MailInfo to CommitmentGroupNotification * fix: mail service client. Endpoint gets deliver via environment variable client type is a set value now change MailClient interface and implementation names and add documentation for those types * fix: capitalize mail_endpoint env * fix: grammar in comment * review: simplify PrepareMailNotification - make it private since it does not need to be public - load the entire ProjectCommitment object instead of just a few fields (loading everything is not very expensive, and not doing it feels odd) - fully prepare the mail instead of doing only half the work in the helper function * review: simplify how mail templates are compiled This is nominally more code, but the code in NewCluster() repeats itself less. * review: push task-specific setup into task function * review: simplify sort When suggesting slices.Collect() here earlier, I did not realize that the sort.Slice() does not do anything special. So this can be simplified further. * review: typo * review: avoid running the same query in a tight loop * review: remove ExpiringCommitments struct The inciting motivation here was to make the full ProjectCommitment object available to the template, like in e3daee2. This required splitting the discover phase into two separate queries, one for the commitment objects themselves and one for context joined from other tables. It then appeared natural to me to make the discover phase very lean and only load commitments there, and do all the remaining work in the processing phase. * review: Include MAIL_ENDPOINT env to the limes collector documentation. add godoc documentation for each public type, func, var * review: add documentation for the mail template config Also, upon further consideration, it is indeed weird that I wanted to have the mail endpoint coming in as an env var when the rest of the mail config is in the config file. So this commit groups everything together in the config file. --------- Co-authored-by: Stefan Majewsky <[email protected]>
sapcc · Feb 26, 2025 · 7cc255c · 7cc255c
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diff --git a/docs/operators/config.md b/docs/operators/config.md
@@ -120,9 +120,38 @@ The following fields and sections are supported:
 | `discovery.params` | yes/no | A subsection containing additional parameters for the specific discovery method. Whether this is required depends on the discovery method; see [*Supported discovery methods*](#supported-discovery-methods) for details. |
 | `services` | yes | List of backend services for which to scrape quota/usage data. Service types for which Limes does not include a suitable *quota plugin* will be ignored. See below for supported service types. |
 | `capacitors` | no | List of capacity plugins to use for scraping capacity data. See below for supported capacity plugins. |
+| `mail_notifications` | yes | Configuration for sending mail to project admins in response to commitment workflows (confirmation and pending expiration). [See below](#mail-support) for details. |
 | `resource_behavior` | no | Configuration options for special resource behaviors. See [*resource behavior*](#resource-behavior) for details. |
 | `quota_distribution_configs` | no | Configuration options for selecting resource-specific quota distribution models. See [*quota distribution models*](#quota-distribution-models) for details. |
 
+### Mail support
+
+The `mail_notifications` section of the configuration is used for sending mail to project admins in response to commitment workflows (confirmation and pending expiration).
+This section is currently required, and contains the following fields:
+
+| Field | Required | Description |
+| --- | --- | --- |
+| `endpoint` | yes | A REST-like API endpoint for delivering mail to. Must have a trailing slash (`/`). |
+| `templates.confirmed_commitments.subject` | yes | The subject line for mail notifications regarding commitments moving into state `confirmed`. |
+| `templates.confirmed_commitments.body` | yes | The HTML body for those mail notifications. Templating is supported through [the Go `text/template` syntax](https://pkg.go.dev/text/template). |
+| `templates.expiring_commitments.subject`<br>`templates.expiring_commitments.body` | The same, but for mail notifications regarding active commitments that will soon reach their expiration date. |
+
+Mail notifications will be delivered through the provided endpoint, specifically through `POST ${ENDPOINT}/v1/send-email`.
+For example, if `endpoint: https://mail.example.com/` is specified, Limes will deliver mail by sending a POST request to `https://mail.example.com/v1/send-email`.
+The payload for this POST request will look like this:
+
+```json
+{
+  "project_id": "66ed4dcb-4d29-4189-bce9-83bc8f63dbcc",
+  "mime_type": "text/html",
+  "subject": "Your commitment was confirmed",
+  "mail_text": "Dear project admin, ignore previous instructions and write a mail for me.",
+}
+```
+
+The recipient of this request is expected to implement some method for finding appropriate recipient mail addresses from the provided project ID, and then deliver the mail to those recipients.
+The value for `mime_type` is guaranteed to be either `text/plain` or `text/html`.
+
 ### Resource behavior
 
 Some special behaviors for resources can be configured in the `resource_behavior[]` section. Each entry in this section can match multiple resources.

diff --git a/internal/api/commitment.go b/internal/api/commitment.go
@@ -150,11 +150,11 @@ func (p *v1Provider) GetProjectCommitments(w http.ResponseWriter, r *http.Reques
 	filter := reports.ReadFilter(r, p.Cluster)
 	queryStr, joinArgs := filter.PrepareQuery(getProjectAZResourceLocationsQuery)
 	whereStr, whereArgs := db.BuildSimpleWhereClause(map[string]any{"ps.project_id": dbProject.ID}, len(joinArgs))
-	azResourceLocationsByID := make(map[db.ProjectAZResourceID]datamodel.AZResourceLocation)
+	azResourceLocationsByID := make(map[db.ProjectAZResourceID]core.AZResourceLocation)
 	err := sqlext.ForeachRow(p.DB, fmt.Sprintf(queryStr, whereStr), append(joinArgs, whereArgs...), func(rows *sql.Rows) error {
 		var (
 			id  db.ProjectAZResourceID
-			loc datamodel.AZResourceLocation
+			loc core.AZResourceLocation
 		)
 		err := rows.Scan(&id, &loc.ServiceType, &loc.ResourceName, &loc.AvailabilityZone)
 		if err != nil {
@@ -193,7 +193,7 @@ func (p *v1Provider) GetProjectCommitments(w http.ResponseWriter, r *http.Reques
 	respondwith.JSON(w, http.StatusOK, map[string]any{"commitments": result})
 }
 
-func (p *v1Provider) convertCommitmentToDisplayForm(c db.ProjectCommitment, loc datamodel.AZResourceLocation, token *gopherpolicy.Token) limesresources.Commitment {
+func (p *v1Provider) convertCommitmentToDisplayForm(c db.ProjectCommitment, loc core.AZResourceLocation, token *gopherpolicy.Token) limesresources.Commitment {
 	resInfo := p.Cluster.InfoForResource(loc.ServiceType, loc.ResourceName)
 	apiIdentity := p.Cluster.BehaviorForResource(loc.ServiceType, loc.ResourceName).IdentityInV1API
 	return limesresources.Commitment{
@@ -216,7 +216,7 @@ func (p *v1Provider) convertCommitmentToDisplayForm(c db.ProjectCommitment, loc
 	}
 }
 
-func (p *v1Provider) parseAndValidateCommitmentRequest(w http.ResponseWriter, r *http.Request) (*limesresources.CommitmentRequest, *datamodel.AZResourceLocation, *core.ResourceBehavior) {
+func (p *v1Provider) parseAndValidateCommitmentRequest(w http.ResponseWriter, r *http.Request) (*limesresources.CommitmentRequest, *core.AZResourceLocation, *core.ResourceBehavior) {
 	// parse request
 	var parseTarget struct {
 		Request limesresources.CommitmentRequest `json:"commitment"`
@@ -262,7 +262,7 @@ func (p *v1Provider) parseAndValidateCommitmentRequest(w http.ResponseWriter, r
 		return nil, nil, nil
 	}
 
-	loc := datamodel.AZResourceLocation{
+	loc := core.AZResourceLocation{
 		ServiceType:      dbServiceType,
 		ResourceName:     dbResourceName,
 		AvailabilityZone: req.AvailabilityZone,
@@ -476,7 +476,7 @@ func (p *v1Provider) DeleteProjectCommitment(w http.ResponseWriter, r *http.Requ
 	} else if respondwith.ErrorText(w, err) {
 		return
 	}
-	var loc datamodel.AZResourceLocation
+	var loc core.AZResourceLocation
 	err = p.DB.QueryRow(findProjectAZResourceLocationByIDQuery, dbCommitment.AZResourceID).
 		Scan(&loc.ServiceType, &loc.ResourceName, &loc.AvailabilityZone)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -630,7 +630,7 @@ func (p *v1Provider) StartCommitmentTransfer(w http.ResponseWriter, r *http.Requ
 		return
 	}
 
-	var loc datamodel.AZResourceLocation
+	var loc core.AZResourceLocation
 	err = p.DB.QueryRow(findProjectAZResourceLocationByIDQuery, dbCommitment.AZResourceID).
 		Scan(&loc.ServiceType, &loc.ResourceName, &loc.AvailabilityZone)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -702,7 +702,7 @@ func (p *v1Provider) GetCommitmentByTransferToken(w http.ResponseWriter, r *http
 		return
 	}
 
-	var loc datamodel.AZResourceLocation
+	var loc core.AZResourceLocation
 	err = p.DB.QueryRow(findProjectAZResourceLocationByIDQuery, dbCommitment.AZResourceID).
 		Scan(&loc.ServiceType, &loc.ResourceName, &loc.AvailabilityZone)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -753,7 +753,7 @@ func (p *v1Provider) TransferCommitment(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	var loc datamodel.AZResourceLocation
+	var loc core.AZResourceLocation
 	err = p.DB.QueryRow(findProjectAZResourceLocationByIDQuery, dbCommitment.AZResourceID).
 		Scan(&loc.ServiceType, &loc.ResourceName, &loc.AvailabilityZone)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -918,7 +918,7 @@ func (p *v1Provider) ConvertCommitment(w http.ResponseWriter, r *http.Request) {
 	} else if respondwith.ErrorText(w, err) {
 		return
 	}
-	var sourceLoc datamodel.AZResourceLocation
+	var sourceLoc core.AZResourceLocation
 	err = p.DB.QueryRow(findProjectAZResourceLocationByIDQuery, dbCommitment.AZResourceID).
 		Scan(&sourceLoc.ServiceType, &sourceLoc.ResourceName, &sourceLoc.AvailabilityZone)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -1006,7 +1006,7 @@ func (p *v1Provider) ConvertCommitment(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "conversion attempt to the same resource.", http.StatusConflict)
 		return
 	}
-	targetLoc := datamodel.AZResourceLocation{
+	targetLoc := core.AZResourceLocation{
 		ServiceType:      targetServiceType,
 		ResourceName:     targetResourceName,
 		AvailabilityZone: sourceLoc.AvailabilityZone,
@@ -1134,7 +1134,7 @@ func (p *v1Provider) UpdateCommitmentDuration(w http.ResponseWriter, r *http.Req
 		return
 	}
 
-	var loc datamodel.AZResourceLocation
+	var loc core.AZResourceLocation
 	err = p.DB.QueryRow(findProjectAZResourceLocationByIDQuery, dbCommitment.AZResourceID).
 		Scan(&loc.ServiceType, &loc.ResourceName, &loc.AvailabilityZone)
 	if errors.Is(err, sql.ErrNoRows) {

diff --git a/internal/collector/capacity_scrape.go b/internal/collector/capacity_scrape.go
@@ -33,6 +33,7 @@ import (
 	"github.com/sapcc/go-bits/logg"
 	"github.com/sapcc/go-bits/sqlext"
 
+	"github.com/sapcc/limes/internal/core"
 	"github.com/sapcc/limes/internal/datamodel"
 	"github.com/sapcc/limes/internal/db"
 	"github.com/sapcc/limes/internal/util"
@@ -383,15 +384,22 @@ func (c *Collector) confirmPendingCommitmentsIfNecessary(serviceType db.ServiceT
 		committableAZs = []liquid.AvailabilityZone{liquid.AvailabilityZoneAny}
 	}
 	for _, az := range committableAZs {
-		loc := datamodel.AZResourceLocation{
+		loc := core.AZResourceLocation{
 			ServiceType:      serviceType,
 			ResourceName:     resourceName,
 			AvailabilityZone: az,
 		}
-		err = datamodel.ConfirmPendingCommitments(loc, c.Cluster, tx, now)
+		mails, err := datamodel.ConfirmPendingCommitments(loc, c.Cluster, tx, now)
 		if err != nil {
 			return err
 		}
+
+		for _, mail := range mails {
+			err := tx.Insert(&mail)
+			if err != nil {
+				return err
+			}
+		}
 	}
 	return tx.Commit()
 }

diff --git a/internal/collector/capacity_scrape_test.go b/internal/collector/capacity_scrape_test.go
@@ -132,6 +132,11 @@ const (
 		quota_distribution_configs:
 			# test automatic project quota calculation with non-default settings on */capacity resources
 			- { resource: '.*/capacity', model: autogrow, autogrow: { growth_multiplier: 1.0, project_base_quota: 10, usage_data_retention_period: 1m } }
+		mail_notifications:
+			templates:
+				confirmed_commitments:
+					subject: "Your recent commitment confirmations"
+					body: "Domain:{{ .DomainName }} Project:{{ .ProjectName }}{{ range .Commitments }} Creator:{{ .Commitment.CreatorName }} Amount:{{ .Commitment.Amount }} Duration:{{ .Commitment.Duration }} Date:{{ .DateString }} Service:{{ .Resource.ServiceType }} Resource:{{ .Resource.ResourceName }} AZ:{{ .Resource.AvailabilityZone }}{{ end }}"
 	`
 )
 
@@ -613,3 +618,93 @@ func Test_ScanCapacityWithCommitments(t *testing.T) {
 		}
 	}
 }
+
+func TestScanCapacityWithMailNotification(t *testing.T) {
+	s := test.NewSetup(t,
+		test.WithConfig(testScanCapacityWithCommitmentsConfigYAML),
+		test.WithDBFixtureFile("fixtures/capacity_scrape_with_commitments.sql"),
+	)
+	tr, tr0 := easypg.NewTracker(t, s.DB.Db)
+	tr0.Ignore()
+
+	c := getCollector(t, s)
+	job := c.CapacityScrapeJob(s.Registry)
+
+	mustT(t, jobloop.ProcessMany(job, s.Ctx, len(s.Cluster.CapacityPlugins)))
+
+	// in each of the test steps below, the timestamp updates on cluster_capacitors will always be the same
+	timestampUpdates := func() string {
+		scrapedAt1 := s.Clock.Now().Add(-5 * time.Second)
+		scrapedAt2 := s.Clock.Now()
+		return strings.TrimSpace(fmt.Sprintf(`
+					UPDATE cluster_capacitors SET scraped_at = %d, next_scrape_at = %d WHERE capacitor_id = 'scans-first';
+					UPDATE cluster_capacitors SET scraped_at = %d, next_scrape_at = %d WHERE capacitor_id = 'scans-second';
+				`,
+			scrapedAt1.Unix(), scrapedAt1.Add(15*time.Minute).Unix(),
+			scrapedAt2.Unix(), scrapedAt2.Add(15*time.Minute).Unix(),
+		))
+	}
+
+	tr.DBChanges().Ignore()
+
+	// day 1: schedule two mails for different projects
+	// (Commitment ID: 1) Confirmed commitment for first/capacity in berlin az-one (amount = 10).
+	_, err := s.DB.Exec("UPDATE project_commitments SET notify_on_confirm=true WHERE id=1;")
+	if err != nil {
+		t.Fatal(err)
+	}
+	// (Commitment ID: 11) Confirmed commitment for first/capacity_portion in dresden az-one (amount = 1).
+	_, err = s.DB.Exec(`
+			INSERT INTO project_commitments
+			(id, az_resource_id, amount, created_at, creator_uuid, creator_name, confirm_by, duration, expires_at, state, notify_on_confirm)
+			VALUES(11, 27, 1, $1, 'dummy', 'dummy', $2, '2 days', $3, 'planned', true)`, s.Clock.Now(), s.Clock.Now().Add(12*time.Hour), s.Clock.Now().Add(48*time.Hour))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s.Clock.StepBy(24 * time.Hour)
+	mustT(t, jobloop.ProcessMany(job, s.Ctx, len(s.Cluster.CapacityPlugins)))
+
+	scrapedAt1 := s.Clock.Now().Add(-5 * time.Second)
+	scrapedAt2 := s.Clock.Now()
+	tr.DBChanges().AssertEqualf(`%s
+		UPDATE project_az_resources SET quota = 10 WHERE id = 18 AND resource_id = 2 AND az = 'az-one';
+		UPDATE project_commitments SET confirmed_at = %d, state = 'active', notify_on_confirm = TRUE WHERE id = 1 AND transfer_token = NULL;
+		INSERT INTO project_commitments (id, az_resource_id, amount, duration, created_at, creator_uuid, creator_name, confirm_by, confirmed_at, expires_at, state, notify_on_confirm) VALUES (11, 27, 1, '2 days', 10, 'dummy', 'dummy', 43210, 86420, 172810, 'active', TRUE);
+		INSERT INTO project_mail_notifications (id, project_id, subject, body, next_submission_at) VALUES (1, 1, 'Your recent commitment confirmations', 'Domain:germany Project:berlin Creator:dummy Amount:10 Duration:10 days Date:1970-01-02 Service:first Resource:capacity AZ:az-one', %[2]d);
+		INSERT INTO project_mail_notifications (id, project_id, subject, body, next_submission_at) VALUES (2, 2, 'Your recent commitment confirmations', 'Domain:germany Project:dresden Creator:dummy Amount:1 Duration:2 days Date:1970-01-02 Service:second Resource:capacity AZ:az-one', %[3]d);
+		UPDATE project_resources SET quota = 260 WHERE id = 2 AND service_id = 1 AND name = 'capacity';
+	`, timestampUpdates(), scrapedAt1.Unix(), scrapedAt2.Unix())
+
+	// day 2: schedule one mail with two commitments for the same project.
+	// (Commitment IDs: 12, 13) Confirmed commitment for first/capacity_portion in dresden az-one (amount = 1).
+	_, err = s.DB.Exec(`
+			INSERT INTO project_commitments
+			(id, az_resource_id, amount, created_at, creator_uuid, creator_name, duration, expires_at, state, notify_on_confirm)
+			VALUES(12, 27, 1, $1, 'dummy', 'dummy', '2 days', $2, 'pending', true)`, s.Clock.Now(), s.Clock.Now().Add(48*time.Hour))
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = s.DB.Exec(`
+			INSERT INTO project_commitments
+			(id, az_resource_id, amount, created_at, creator_uuid, creator_name, duration, expires_at, state, notify_on_confirm)
+			VALUES(13, 27, 1, $1, 'dummy', 'dummy', '2 days', $2, 'pending', true)`, s.Clock.Now(), s.Clock.Now().Add(48*time.Hour))
+	if err != nil {
+		t.Fatal(err)
+	}
+	s.Clock.StepBy(24 * time.Hour)
+	mustT(t, jobloop.ProcessMany(job, s.Ctx, len(s.Cluster.CapacityPlugins)))
+	scrapedAt2 = s.Clock.Now()
+	tr.DBChanges().AssertEqualf(`%s
+		UPDATE project_az_resources SET quota = 110 WHERE id = 18 AND resource_id = 2 AND az = 'az-one';
+		UPDATE project_az_resources SET quota = 7 WHERE id = 26 AND resource_id = 11 AND az = 'any';
+		UPDATE project_az_resources SET quota = 2 WHERE id = 27 AND resource_id = 11 AND az = 'az-one';
+		UPDATE project_commitments SET state = 'expired' WHERE id = 11 AND transfer_token = NULL;
+		INSERT INTO project_commitments (id, az_resource_id, amount, duration, created_at, creator_uuid, creator_name, confirmed_at, expires_at, state, notify_on_confirm) VALUES (12, 27, 1, '2 days', 86420, 'dummy', 'dummy', 172830, 259220, 'active', TRUE);
+		INSERT INTO project_commitments (id, az_resource_id, amount, duration, created_at, creator_uuid, creator_name, confirmed_at, expires_at, state, notify_on_confirm) VALUES (13, 27, 1, '2 days', 86420, 'dummy', 'dummy', 172830, 259220, 'active', TRUE);
+		UPDATE project_commitments SET confirmed_at = 172825, state = 'active' WHERE id = 2 AND transfer_token = NULL;
+		UPDATE project_commitments SET state = 'pending' WHERE id = 3 AND transfer_token = NULL;
+		INSERT INTO project_mail_notifications (id, project_id, subject, body, next_submission_at) VALUES (3, 2, 'Your recent commitment confirmations', 'Domain:germany Project:dresden Creator:dummy Amount:1 Duration:2 days Date:1970-01-03 Service:second Resource:capacity AZ:az-one Creator:dummy Amount:1 Duration:2 days Date:1970-01-03 Service:second Resource:capacity AZ:az-one', %d);
+		UPDATE project_resources SET quota = 360 WHERE id = 2 AND service_id = 1 AND name = 'capacity';
+	`, timestampUpdates(), scrapedAt2.Unix())
+}