[performance] Speed up some of the slower db queries (#523)

* remove unnecessary LOWER() db calls

* warn during slow db queries

* use bundb built-in exists function

* add db block test

* update account block query

* add domain block db test

* optimize domain block query

* fix implementing wrong test

* exclude most columns when checking block

* go fmt

* remote more unnecessary use of LOWER()

1 files changed, 6 insertions, 2 deletions

diff --git a/internal/processing/admin/createdomainblock.go b/internal/processing/admin/createdomainblock.go
index 9bf7c2fd4..3cfaabce0 100644
--- a/internal/processing/admin/createdomainblock.go
+++ b/internal/processing/admin/createdomainblock.go
@@ -21,6 +21,7 @@ package admin
 import (
 	"context"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/sirupsen/logrus"
@@ -35,9 +36,12 @@ import (
 )
 
 func (p *processor) DomainBlockCreate(ctx context.Context, account *gtsmodel.Account, domain string, obfuscate bool, publicComment string, privateComment string, subscriptionID string) (*apimodel.DomainBlock, gtserror.WithCode) {
+	// domain blocks will always be lowercase
+	domain = strings.ToLower(domain)
+
 	// first check if we already have a block -- if err == nil we already had a block so we can skip a whole lot of work
 	domainBlock := &gtsmodel.DomainBlock{}
-	err := p.db.GetWhere(ctx, []db.Where{{Key: "domain", Value: domain, CaseInsensitive: true}}, domainBlock)
+	err := p.db.GetWhere(ctx, []db.Where{{Key: "domain", Value: domain}}, domainBlock)
 	if err != nil {
 		if err != db.ErrNoEntries {
 			// something went wrong in the DB
@@ -95,7 +99,7 @@ func (p *processor) initiateDomainBlockSideEffects(ctx context.Context, account
 
 	// if we have an instance entry for this domain, update it with the new block ID and clear all fields
 	instance := &gtsmodel.Instance{}
-	if err := p.db.GetWhere(ctx, []db.Where{{Key: "domain", Value: block.Domain, CaseInsensitive: true}}, instance); err == nil {
+	if err := p.db.GetWhere(ctx, []db.Where{{Key: "domain", Value: block.Domain}}, instance); err == nil {
 		instance.Title = ""
 		instance.UpdatedAt = time.Now()
 		instance.SuspendedAt = time.Now()