[feature] Debug admin endpoint to clear caches (#2940)

* [feature] Debug admin endpoint to clear caches

* go fmt

internal/api/client/admin/admin.go

@@ -23,6 +23,7 @@ import (
 	"codeberg.org/gruf/go-debug"
 	"github.com/gin-gonic/gin"
 	"github.com/superseriousbusiness/gotosocial/internal/processing"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
 )
 
 const (
@@ -56,6 +57,7 @@ const (
 	InstanceRulesPathWithID = InstanceRulesPath + "/:" + IDKey
 	DebugPath               = BasePath + "/debug"
 	DebugAPUrlPath          = DebugPath + "/apurl"
+	DebugClearCachesPath    = DebugPath + "/caches/clear"
 
 	IDKey                 = "id"
 	FilterQueryKey        = "filter"
@@ -73,11 +75,13 @@ const (
 
 type Module struct {
 	processor *processing.Processor
+	state     *state.State
 }
 
-func New(processor *processing.Processor) *Module {
+func New(state *state.State, processor *processing.Processor) *Module {
 	return &Module{
 		processor: processor,
+		state:     state,
 	}
 }
 
@@ -145,5 +149,6 @@ func (m *Module) Route(attachHandler func(method string, path string, f ...gin.H
 	// debug stuff
 	if debug.DEBUG {
 		attachHandler(http.MethodGet, DebugAPUrlPath, m.DebugAPUrlHandler)
+		attachHandler(http.MethodPost, DebugClearCachesPath, m.DebugClearCachesHandler)
 	}
 }

internal/api/client/admin/admin_test.go

@@ -105,7 +105,7 @@ func (suite *AdminStandardTestSuite) SetupTest() {
 	suite.sentEmails = make(map[string]string)
 	suite.emailSender = testrig.NewEmailSender("../../../../web/template/", suite.sentEmails)
 	suite.processor = testrig.NewTestProcessor(&suite.state, suite.federator, suite.emailSender, suite.mediaManager)
-	suite.adminModule = admin.New(suite.processor)
+	suite.adminModule = admin.New(&suite.state, suite.processor)
 	testrig.StandardDBSetup(suite.db, nil)
 	testrig.StandardStorageSetup(suite.storage, "../../../../testrig/media")
 }

internal/api/client/admin/debug_off.go

@@ -73,3 +73,35 @@ import (
 //		'500':
 //			description: internal server error
 func (m *Module) DebugAPUrlHandler(c *gin.Context) {}
+
+// DebugClearCachesHandler swagger:operation POST /api/v1/admin/debug/caches/clear debugClearCaches
+//
+// Sweep/clear all in-memory caches.
+//
+// Only enabled / exposed if GoToSocial was built and is running with flag DEBUG=1.
+//
+//	---
+//	tags:
+//	- debug
+//
+//	produces:
+//	- application/json
+//
+//	security:
+//	- OAuth2 Bearer:
+//		- admin
+//
+//	responses:
+//		'200':
+//			description: All good baby!
+//		'400':
+//			description: bad request
+//		'401':
+//			description: unauthorized
+//		'404':
+//			description: not found
+//		'406':
+//			description: not acceptable
+//		'500':
+//			description: internal server error
+func (m *Module) DebugClearCachesHandler(c *gin.Context) {}

internal/api/client/admin/debug_on.go

@@ -56,3 +56,27 @@ func (m *Module) DebugAPUrlHandler(c *gin.Context) {
 
 	c.JSON(http.StatusOK, resp)
 }
+
+func (m *Module) DebugClearCachesHandler(c *gin.Context) {
+	authed, err := oauth.Authed(c, true, true, true, true)
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	if !*authed.User.Admin {
+		err := fmt.Errorf("user %s not an admin", authed.User.ID)
+		apiutil.ErrorHandler(c, gtserror.NewErrorForbidden(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	if _, err := apiutil.NegotiateAccept(c, apiutil.JSONAcceptHeaders...); err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
+		return
+	}
+
+	// Sweep all caches down to 0 (empty).
+	m.state.Caches.Sweep(0)
+
+	c.JSON(http.StatusOK, gin.H{"status": "OK"})
+}