From 8aee4b16f9d88cfbecffe04f4c0be6b7a588ebb9 Mon Sep 17 00:00:00 2001
From: Kleissner <peter@kleissner.investments>
Date: Mon, 3 Jan 2022 00:15:20 +0100
Subject: [PATCH] Search: Check if search index is available in main functions.

---
 search/Search Index.go | 22 ++++++++++++++++------
 search/Search Term.go  |  4 ++++
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/search/Search Index.go b/search/Search Index.go
index fa43768..b60f662 100644
--- a/search/Search Index.go	
+++ b/search/Search Index.go	
@@ -57,7 +57,7 @@ func InitSearchIndexStore(DatabaseDirectory string) (searchIndex *SearchIndexSto
 }
 
 func (index *SearchIndexStore) IndexNewBlock(publicKey *btcec.PublicKey, blockchainVersion, blockNumber uint64, raw []byte) {
-	if index.Database == nil {
+	if index == nil {
 		return
 	}
 
@@ -67,7 +67,16 @@ func (index *SearchIndexStore) IndexNewBlock(publicKey *btcec.PublicKey, blockch
 		return
 	}
 
-	for _, decodedR := range decoded.RecordsDecoded {
+	index.IndexNewBlockDecoded(publicKey, blockchainVersion, blockNumber, decoded.RecordsDecoded)
+}
+
+// Indexes a new decoded block. Currently it only indexes file records.
+func (index *SearchIndexStore) IndexNewBlockDecoded(publicKey *btcec.PublicKey, blockchainVersion, blockNumber uint64, recordsDecoded []interface{}) {
+	if index == nil {
+		return
+	}
+
+	for _, decodedR := range recordsDecoded {
 		if file, ok := decodedR.(blockchain.BlockRecordFile); ok {
 			var filename, folder, description string
 			for _, tag := range file.Tags {
@@ -94,7 +103,7 @@ func (index *SearchIndexStore) IndexNewBlock(publicKey *btcec.PublicKey, blockch
 
 // UnindexBlockchain deletes all index for a given blockchain. This is intentionally not done on a version/block level, because it could easily lead to orphans.
 func (index *SearchIndexStore) UnindexBlockchain(publicKey *btcec.PublicKey) {
-	if index.Database == nil {
+	if index == nil {
 		return
 	}
 
@@ -123,7 +132,7 @@ func (index *SearchIndexStore) UnindexBlockchain(publicKey *btcec.PublicKey) {
 
 // IndexHash indexes a new hash
 func (index *SearchIndexStore) IndexHash(publicKey *btcec.PublicKey, blockchainVersion, blockNumber uint64, fileID uuid.UUID, hash []byte) (err error) {
-	if index.Database == nil {
+	if index == nil {
 		return
 	}
 
@@ -152,7 +161,7 @@ func (index *SearchIndexStore) IndexHash(publicKey *btcec.PublicKey, blockchainV
 
 // UnindexHash deletes a index record. If there are no more files associated with the hash, the entire hash record is deleted.
 func (index *SearchIndexStore) UnindexHash(fileID uuid.UUID, hash []byte) (err error) {
-	if index.Database == nil {
+	if index == nil {
 		return
 	}
 
@@ -187,7 +196,7 @@ func (index *SearchIndexStore) UnindexHash(fileID uuid.UUID, hash []byte) (err e
 
 // LookupHash returns all index records stored for the hash.
 func (index *SearchIndexStore) LookupHash(selector SearchSelector, resultMap map[uuid.UUID]*SearchIndexRecord) (err error) {
-	if index.Database == nil {
+	if index == nil {
 		return
 	}
 
@@ -218,6 +227,7 @@ func (index *SearchIndexStore) LookupHash(selector SearchSelector, resultMap map
 // ---- index and reverse index code ----
 
 /*
+Index records are records looked up based on a hash (the search term) to uniquely identify a single file.
 Structure for each index record:
 
 Offset   Size    Info
diff --git a/search/Search Term.go b/search/Search Term.go
index 182a9ef..96265da 100644
--- a/search/Search Term.go	
+++ b/search/Search Term.go	
@@ -11,6 +11,10 @@ import (
 )
 
 func (index *SearchIndexStore) Search(term string) (results []SearchIndexRecord) {
+	if index == nil { // Search index may not be available.
+		return nil
+	}
+
 	termS, isExact, _ := sanitizeInputTerm(term)
 
 	if len(termS) < wordMinLength {