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Optimize the healthcheck analyzer to avoid a full table scan

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This commit is contained in:
David Dworken 2022-11-25 20:35:17 -08:00
parent 1ce20157c7
commit 8d87110405
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1 changed files with 8 additions and 3 deletions
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11
backend/server/server.go
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@ -183,6 +183,7 @@ func apiSubmitHandler(ctx context.Context, w http.ResponseWriter, r *http.Reques
for _, entry := range entries {
entry.DeviceId = device.DeviceId
}
// TODO(bug): This fails with gorm if entries is VERY large. Chunk it.
checkGormResult(GLOBAL_DB.WithContext(ctx).Create(&entries))
}
GLOBAL_STATSD.Count("hishtory.submit", int64(len(devices)), []string{}, 1.0)
@ -208,6 +209,7 @@ func apiQueryHandler(ctx context.Context, w http.ResponseWriter, r *http.Request
deviceId := getRequiredQueryParam(r, "device_id")
updateUsageData(ctx, r, userId, deviceId, 0, true)
// Increment the count
// TODO(optimization): Have this run in a background thread to avoid slowing down the entire response
checkGormResult(GLOBAL_DB.WithContext(ctx).Exec("UPDATE enc_history_entries SET read_count = read_count + 1 WHERE device_id = ?", deviceId))
// Delete any entries that match a pending deletion request
@ -373,11 +375,14 @@ func healthCheckHandler(ctx context.Context, w http.ResponseWriter, r *http.Requ
}
if isProductionEnvironment() {
// Check that we have a reasonable looking set of devices/entries in the DB
var count int64
checkGormResult(GLOBAL_DB.WithContext(ctx).Model(&shared.EncHistoryEntry{}).Count(&count))
if count < 1000 {
rows, err := GLOBAL_DB.Raw("SELECT true FROM enc_history_entries LIMIT 1 OFFSET 1000").Rows()
if err != nil {
panic(fmt.Sprintf("failed to count entries in DB: %v", err))
}
if !rows.Next() {
panic("Suspiciously few enc history entries!")
}
var count int64
checkGormResult(GLOBAL_DB.WithContext(ctx).Model(&shared.Device{}).Count(&count))
if count < 100 {
panic("Suspiciously few devices!")