[performance] cache more database calls, reduce required database calls overall (#3290)

* improvements to caching for lists and relationship to accounts / follows

* fix nil panic in AddToList()

* ensure list related caches are correctly invalidated

* ensure returned ID lists are ordered correctly

* bump go-structr to v0.8.9 (returns early if zero uncached keys to be loaded)

* remove zero checks in uncached key load functions (go-structr now handles this)

* fix issues after rebase on upstream/main

* update the expected return order of CSV exports (since list entries are now down by entry creation date)

* rename some funcs, allow deleting list entries for multiple follow IDs at a time, fix up more tests

* use returning statements on delete to get cache invalidation info

* fixes to recent database delete changes

* fix broken list entries delete sql

* remove unused db function

* update remainder of delete functions to behave in similar way, some other small tweaks

* fix delete user sql, allow returning on err no entries

* uncomment + fix list database tests

* update remaining list tests

* update envparsing test

* add comments to each specific key being invalidated

* add more cache invalidation explanatory comments

* whoops; actually delete poll votes from database in the DeletePollByID() func

* remove added but-commented-out field

* improved comment regarding paging being disabled

* make cache invalidation comments match what's actually happening

* fix up delete query comments to match what is happening

* rename function to read a bit better

* don't use ErrNoEntries on delete when not needed (it's only needed for a RETURNING call)

* update function name in test

* move list exclusivity check to AFTER eligibility check. use log.Panic() instead of panic()

* use the poll_id column in poll_votes for selecting votes in poll ID

* fix function name

4 files changed, 23 insertions, 37 deletions

diff --git a/internal/api/client/exports/exports_test.go b/internal/api/client/exports/exports_test.go
index 1943f2582..303361b86 100644
--- a/internal/api/client/exports/exports_test.go
+++ b/internal/api/client/exports/exports_test.go
@@ -188,8 +188,8 @@ admin@localhost:8080
 			token:       suite.testTokens["local_account_1"],
 			user:        suite.testUsers["local_account_1"],
 			account:     suite.testAccounts["local_account_1"],
-			expect: `Cool Ass Posters From This Instance,admin@localhost:8080
-Cool Ass Posters From This Instance,1happyturtle@localhost:8080
+			expect: `Cool Ass Posters From This Instance,1happyturtle@localhost:8080
+Cool Ass Posters From This Instance,admin@localhost:8080
 `,
 		},
 		// Export Mutes.
diff --git a/internal/api/client/lists/listaccounts.go b/internal/api/client/lists/listaccounts.go
index e1d340ebb..d609251f7 100644
--- a/internal/api/client/lists/listaccounts.go
+++ b/internal/api/client/lists/listaccounts.go
@@ -25,6 +25,7 @@ import (
 	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
 )
 
 // ListAccountsGETHandler swagger:operation GET /api/v1/lists/{id}/accounts listAccounts
@@ -129,42 +130,27 @@ func (m *Module) ListAccountsGETHandler(c *gin.Context) {
 
 	targetListID := c.Param(IDKey)
 	if targetListID == "" {
-		err := errors.New("no list id specified")
-		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
-		return
-	}
-
-	limit, errWithCode := apiutil.ParseLimit(c.Query(apiutil.LimitKey), 40, 80, 0)
-	if errWithCode != nil {
+		const text = "no list id specified"
+		errWithCode := gtserror.NewErrorBadRequest(errors.New(text), text)
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
 	}
 
-	var (
-		ctx = c.Request.Context()
+	page, errWithCode := paging.ParseIDPage(c,
+		1,  // min limit
+		80, // max limit
+		0,  // default = paging disabled
 	)
-
-	if limit == 0 {
-		// Return all accounts in the list without pagination.
-		accounts, errWithCode := m.processor.List().GetAllListAccounts(ctx, authed.Account, targetListID)
-		if errWithCode != nil {
-			apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
-			return
-		}
-
-		c.JSON(http.StatusOK, accounts)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
 	}
 
-	// Return subset of accounts in the list with pagination.
 	resp, errWithCode := m.processor.List().GetListAccounts(
-		ctx,
+		c.Request.Context(),
 		authed.Account,
 		targetListID,
-		c.Query(MaxIDKey),
-		c.Query(SinceIDKey),
-		c.Query(MinIDKey),
-		limit,
+		page,
 	)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
diff --git a/internal/api/client/lists/listaccounts_test.go b/internal/api/client/lists/listaccounts_test.go
index bbd187f7d..e0a16e29f 100644
--- a/internal/api/client/lists/listaccounts_test.go
+++ b/internal/api/client/lists/listaccounts_test.go
@@ -19,7 +19,7 @@ package lists_test
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"strconv"
@@ -97,7 +97,7 @@ func (suite *ListAccountsTestSuite) getListAccounts(
 	result := recorder.Result()
 	defer result.Body.Close()
 
-	b, err := ioutil.ReadAll(result.Body)
+	b, err := io.ReadAll(result.Body)
 	if err != nil {
 		return nil, "", err
 	}
@@ -151,8 +151,7 @@ func (suite *ListAccountsTestSuite) TestGetListAccountsPaginatedDefaultLimit() {
 
 	suite.Len(accounts, 2)
 	suite.Equal(
-		`<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=40&max_id=01H0G89MWVQE0M58VD2HQYMQWH>; rel="next", `+
-			`<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=40&min_id=01H0G8FFM1AGQDRNGBGGX8CYJQ>; rel="prev"`,
+		"<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=40&max_id=01F8MH5NBDF2MV7CTC4Q5128HF>; rel=\"next\", <http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=40&min_id=01F8MH17FWEB39HZJ76B6VXSKF>; rel=\"prev\"",
 		link,
 	)
 }
@@ -184,8 +183,7 @@ func (suite *ListAccountsTestSuite) TestGetListAccountsPaginatedNextPage() {
 
 	suite.Len(accounts, 1)
 	suite.Equal(
-		`<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&max_id=01H0G8FFM1AGQDRNGBGGX8CYJQ>; rel="next", `+
-			`<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&min_id=01H0G8FFM1AGQDRNGBGGX8CYJQ>; rel="prev"`,
+		"<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&max_id=01F8MH17FWEB39HZJ76B6VXSKF>; rel=\"next\", <http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&min_id=01F8MH17FWEB39HZJ76B6VXSKF>; rel=\"prev\"",
 		link,
 	)
 
@@ -206,8 +204,7 @@ func (suite *ListAccountsTestSuite) TestGetListAccountsPaginatedNextPage() {
 
 	suite.Len(accounts, 1)
 	suite.Equal(
-		`<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&max_id=01H0G89MWVQE0M58VD2HQYMQWH>; rel="next", `+
-			`<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&min_id=01H0G89MWVQE0M58VD2HQYMQWH>; rel="prev"`,
+		"<http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&max_id=01F8MH17FWEB39HZJ76B6VXSKF>; rel=\"next\", <http://localhost:8080/api/v1/lists/01H0G8E4Q2J3FE3JDWJVWEDCD1/accounts?limit=1&min_id=01F8MH17FWEB39HZJ76B6VXSKF>; rel=\"prev\"",
 		link,
 	)
 }
diff --git a/internal/api/client/lists/listaccountsadd_test.go b/internal/api/client/lists/listaccountsadd_test.go
index 7e44eeed3..e71cf0992 100644
--- a/internal/api/client/lists/listaccountsadd_test.go
+++ b/internal/api/client/lists/listaccountsadd_test.go
@@ -98,14 +98,17 @@ func (suite *ListAccountsAddTestSuite) TestPostListAccountNotFollowed() {
 
 	resp, err := suite.postListAccounts(http.StatusNotFound, listID, accountIDs)
 	suite.NoError(err)
-	suite.Equal(`{"error":"Not Found: you do not follow account 01F8MH5ZK5VRH73AKHQM6Y9VNX"}`, string(resp))
+	suite.Equal(`{"error":"Not Found: account 01F8MH5ZK5VRH73AKHQM6Y9VNX not currently followed"}`, string(resp))
 }
 
 func (suite *ListAccountsAddTestSuite) TestPostListAccountOK() {
+	entry := suite.testListEntries["local_account_1_list_1_entry_1"]
+
 	// Remove turtle from the list.
 	if err := suite.db.DeleteListEntry(
 		context.Background(),
-		suite.testListEntries["local_account_1_list_1_entry_1"].ID,
+		entry.ListID,
+		entry.FollowID,
 	); err != nil {
 		suite.FailNow(err.Error())
 	}