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authorsiddharth <s@ricketyspace.net>2021-11-28 18:32:18 -0500
committersiddharth <s@ricketyspace.net>2021-11-28 18:32:18 -0500
commitc1ace352e8ba09ec3c00317e72de6b871a8964ec (patch)
tree31da0ec7dca9a54d461e09cf2bbb81752317ed60 /db
parent0206d6e63427c168fe6f0fcdf2bee17e964a3d65 (diff)
db: add FernDB.Write
Writes database to disk.
Diffstat (limited to 'db')
-rw-r--r--db/db.go25
-rw-r--r--db/db_test.go122
2 files changed, 147 insertions, 0 deletions
diff --git a/db/db.go b/db/db.go
index bbe5b36..4ee511b 100644
--- a/db/db.go
+++ b/db/db.go
@@ -96,3 +96,28 @@ func (fdb *FernDB) Add(feed, entry string) {
fdb.downloaded[feed] = append(fdb.downloaded[feed], entry)
fdb.mutex.Unlock()
}
+
+func (fdb *FernDB) Write() error {
+ if len(dbPath) == 0 {
+ return fmt.Errorf("FernDB path not set")
+ }
+
+ f, err := os.OpenFile(dbPath, os.O_WRONLY|os.O_CREATE, 0644)
+ if err != nil {
+ return err
+ }
+ defer f.Close()
+
+ // Marshal database into json.
+ bs, err := json.Marshal(fdb.downloaded)
+ if err != nil {
+ return err
+ }
+
+ // Write to disk.
+ _, err = f.Write(bs)
+ if err != nil {
+ return err
+ }
+ return nil
+}
diff --git a/db/db_test.go b/db/db_test.go
index 8fc9fed..de27149 100644
--- a/db/db_test.go
+++ b/db/db_test.go
@@ -248,3 +248,125 @@ func TestAdd(t *testing.T) {
return
}
}
+
+func TestWriteNewDB(t *testing.T) {
+ // Set custom path for db.
+ dbPath = path.Join(os.TempDir(), "fern-db.json")
+ defer os.Remove(dbPath)
+
+ // Open the db.
+ db, err := Open()
+ if err != nil {
+ t.Errorf("db.Open failed: %v", err.Error())
+ return
+ }
+
+ // Populate db with test data and write to db to disk.
+ db.Add("npr", "william-prince")
+ db.Add("npr", "julian-baker")
+ db.Add("mkbhd", "v-raptor")
+ db.Write()
+
+ // Read db refreshly from disk and verify the db contents.
+ db, err = Open()
+ if err != nil {
+ t.Errorf("db.Open failed: %v", err.Error())
+ return
+ }
+ if len(db.downloaded["npr"]) != 2 {
+ t.Errorf("db.Add failed: expected 2 entries for 'npr'")
+ return
+ }
+ if !db.Exists("npr", "william-prince") {
+ t.Errorf("db.Add failed: expected %s in 'npr' feed",
+ "william-prince")
+ return
+ }
+ if !db.Exists("npr", "julian-baker") {
+ t.Errorf("db.Add failed: expected %s in 'npr' feed",
+ "julian-baker")
+ return
+ }
+ if len(db.downloaded["mkbhd"]) != 1 {
+ t.Errorf("db.Add failed: expected 1 entry for 'npr'")
+ return
+ }
+ if !db.Exists("mkbhd", "v-raptor") {
+ t.Errorf("db.Add failed: expected %s in 'mkbhd' feed",
+ "v-raptor")
+ return
+ }
+}
+
+func TestWriteExistingDB(t *testing.T) {
+ // Set custom path for db.
+ dbPath = path.Join(os.TempDir(), "fern-db.json")
+ defer os.Remove(dbPath)
+
+ // Write a sample test db to fern-db.json
+ testDBJSON := []byte(`{"npr":["kurt-vile","joy-oladokun"]}`)
+ dbFile, err := os.Create(dbPath)
+ defer dbFile.Close()
+ if err != nil {
+ t.Errorf("Unable to create fern-db.json: %v", err.Error())
+ return
+ }
+ n, err := dbFile.Write(testDBJSON)
+ if len(testDBJSON) != n {
+ t.Errorf("Write to fern-db.json failed: %v", err.Error())
+ return
+ }
+
+ // Open the db.
+ db, err := Open()
+ if err != nil {
+ t.Errorf("db.Open failed: %v", err.Error())
+ return
+ }
+
+ // Populate db with test data and write to db to disk.
+ db.Add("npr", "william-prince")
+ db.Add("npr", "julian-baker")
+ db.Add("mkbhd", "v-raptor")
+ db.Write()
+
+ // Read db refreshly from disk and verify the db contents.
+ db, err = Open()
+ if err != nil {
+ t.Errorf("db.Open failed: %v", err.Error())
+ return
+ }
+ if len(db.downloaded["npr"]) != 4 {
+ t.Errorf("db.Add failed: expected 2 entries for 'npr'")
+ return
+ }
+ if !db.Exists("npr", "kurt-vile") {
+ t.Errorf("db.Add failed: expected %s in 'npr' feed",
+ "kurt-vile")
+ return
+ }
+ if !db.Exists("npr", "joy-oladokun") {
+ t.Errorf("db.Add failed: expected %s in 'npr' feed",
+ "joy-oladokun")
+ return
+ }
+ if !db.Exists("npr", "william-prince") {
+ t.Errorf("db.Add failed: expected %s in 'npr' feed",
+ "william-prince")
+ return
+ }
+ if !db.Exists("npr", "julian-baker") {
+ t.Errorf("db.Add failed: expected %s in 'npr' feed",
+ "julian-baker")
+ return
+ }
+ if len(db.downloaded["mkbhd"]) != 1 {
+ t.Errorf("db.Add failed: expected 1 entry for 'npr'")
+ return
+ }
+ if !db.Exists("mkbhd", "v-raptor") {
+ t.Errorf("db.Add failed: expected %s in 'mkbhd' feed",
+ "v-raptor")
+ return
+ }
+}