2 files changed, 60 insertions, 0 deletions
diff --git a/internal/db/db.go b/internal/db/db.go
index 4e21358c3..204f04c71 100644
--- a/internal/db/db.go
+++ b/internal/db/db.go
@@ -253,6 +253,14 @@ type DB interface {
 	// GetNotificationsForAccount returns a list of notifications that pertain to the given accountID.
 	GetNotificationsForAccount(accountID string, limit int, maxID string, sinceID string) ([]*gtsmodel.Notification, error)
 
+	// GetUserCountForInstance returns the number of known accounts registered with the given domain.
+	GetUserCountForInstance(domain string) (int, error)
+
+	// GetStatusCountForInstance returns the number of known statuses posted from the given domain.
+	GetStatusCountForInstance(domain string) (int, error)
+
+	// GetDomainCountForInstance returns the number of known instances known that the given domain federates with.
+	GetDomainCountForInstance(domain string) (int, error)
 	/*
 		USEFUL CONVERSION FUNCTIONS
 	*/
diff --git a/internal/db/pg/instancestats.go b/internal/db/pg/instancestats.go
new file mode 100644
index 000000000..b57591d7b
--- /dev/null
+++ b/internal/db/pg/instancestats.go
@@ -0,0 +1,52 @@
+package pg
+
+import (
+	"github.com/go-pg/pg/v10"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (ps *postgresService) GetUserCountForInstance(domain string) (int, error) {
+	q := ps.conn.Model(&[]*gtsmodel.Account{})
+
+	if domain == ps.config.Host {
+		// if the domain is *this* domain, just count where the domain field is null
+		q = q.Where("? IS NULL", pg.Ident("domain"))
+	} else {
+		q = q.Where("domain = ?", domain)
+	}
+
+	// don't count the instance account or suspended users
+	q = q.Where("username != ?", domain).Where("? IS NULL", pg.Ident("suspended_at"))
+
+	return q.Count()
+}
+
+func (ps *postgresService) GetStatusCountForInstance(domain string) (int, error) {
+	q := ps.conn.Model(&[]*gtsmodel.Status{})
+
+	if domain == ps.config.Host {
+		// if the domain is *this* domain, just count where local is true
+		q = q.Where("local = ?", true)
+	} else {
+		// join on the domain of the account
+		q = q.Join("JOIN accounts AS account ON account.id = status.account_id").
+			Where("account.domain = ?", domain)
+	}
+
+	return q.Count()
+}
+
+func (ps *postgresService) GetDomainCountForInstance(domain string) (int, error) {
+	q := ps.conn.Model(&[]*gtsmodel.Instance{})
+
+	if domain == ps.config.Host {
+		// if the domain is *this* domain, just count other instances it knows about
+		// TODO: exclude domains that are blocked or silenced
+		q = q.Where("domain != ?", domain)
+	} else {
+		// TODO: implement federated domain counting properly for remote domains
+		return 0, nil
+	}
+
+	return q.Count()
+}