Adds a ColumnFamilyDefinition struct to store column family options

lib/src/storage/fallback_backend.rs

@@ -4,14 +4,18 @@ use std::collections::BTreeMap;
 use std::io::Result;
 use std::sync::{Arc, RwLock};
 
+pub struct ColumnFamilyDefinition {
+    pub name: &'static str,
+}
+
 #[derive(Clone)]
 pub struct Db(Arc<RwLock<BTreeMap<ColumnFamily, BTreeMap<Vec<u8>, Vec<u8>>>>>);
 
 impl Db {
-    pub fn new(column_families: &'static [&'static str]) -> Result<Self> {
+    pub fn new(column_families: Vec<ColumnFamilyDefinition>) -> Result<Self> {
         let mut trees = BTreeMap::new();
         for cf in column_families {
-            trees.insert(ColumnFamily(*cf), BTreeMap::default());
+            trees.insert(ColumnFamily(cf.name), BTreeMap::default());
         }
         trees.entry(ColumnFamily("default")).or_default(); // We make sure that "default" key exists.
         Ok(Self(Arc::new(RwLock::new(trees))))

lib/src/storage/mod.rs

@@ -8,9 +8,9 @@ use crate::storage::binary_encoder::{
 };
 use crate::storage::numeric_encoder::{EncodedQuad, EncodedTerm, StrHash, StrLookup, TermEncoder};
 #[cfg(target_arch = "wasm32")]
-use fallback_backend::{ColumnFamily, Db, Iter};
+use fallback_backend::{ColumnFamily, ColumnFamilyDefinition, Db, Iter};
 #[cfg(not(target_arch = "wasm32"))]
-use rocksdb_backend::{ColumnFamily, Db, Iter};
+use rocksdb_backend::{ColumnFamily, ColumnFamilyDefinition, Db, Iter};
 #[cfg(not(target_arch = "wasm32"))]
 use std::path::Path;
 
@@ -36,11 +36,6 @@ const DOSP_CF: &str = "dosp";
 const GRAPHS_CF: &str = "graphs";
 const DEFAULT_CF: &str = "default";
 
-const COLUMN_FAMILIES: [&str; 11] = [
-    ID2STR_CF, SPOG_CF, POSG_CF, OSPG_CF, GSPO_CF, GPOS_CF, GOSP_CF, DSPO_CF, DPOS_CF, DOSP_CF,
-    GRAPHS_CF,
-];
-
 /// Low level storage primitives
 #[derive(Clone)]
 pub struct Storage {
@@ -61,12 +56,28 @@ pub struct Storage {
 
 impl Storage {
     pub fn new() -> std::io::Result<Self> {
-        Self::setup(Db::new(&COLUMN_FAMILIES)?)
+        Self::setup(Db::new(Self::column_families())?)
     }
 
     #[cfg(not(target_arch = "wasm32"))]
     pub fn open(path: &Path) -> std::io::Result<Self> {
-        Self::setup(Db::open(path, &COLUMN_FAMILIES)?)
+        Self::setup(Db::open(path, Self::column_families())?)
+    }
+
+    fn column_families() -> Vec<ColumnFamilyDefinition> {
+        vec![
+            ColumnFamilyDefinition { name: ID2STR_CF },
+            ColumnFamilyDefinition { name: SPOG_CF },
+            ColumnFamilyDefinition { name: POSG_CF },
+            ColumnFamilyDefinition { name: OSPG_CF },
+            ColumnFamilyDefinition { name: GSPO_CF },
+            ColumnFamilyDefinition { name: GPOS_CF },
+            ColumnFamilyDefinition { name: GOSP_CF },
+            ColumnFamilyDefinition { name: DSPO_CF },
+            ColumnFamilyDefinition { name: DPOS_CF },
+            ColumnFamilyDefinition { name: DOSP_CF },
+            ColumnFamilyDefinition { name: GRAPHS_CF },
+        ]
     }
 
     fn setup(db: Db) -> std::io::Result<Self> {

lib/src/storage/rocksdb_backend.rs

@@ -37,6 +37,10 @@ macro_rules! ffi_result_impl {
     }}
 }
 
+pub struct ColumnFamilyDefinition {
+    pub name: &'static str,
+}
+
 #[derive(Clone)]
 pub struct Db(Arc<DbHandler>);
 
@@ -52,7 +56,7 @@ struct DbHandler {
     low_priority_write_options: *mut rocksdb_writeoptions_t,
     flush_options: *mut rocksdb_flushoptions_t,
     env: Option<*mut rocksdb_env_t>,
-    column_families: Vec<&'static str>,
+    column_families: Vec<ColumnFamilyDefinition>,
     cf_handles: Vec<*mut rocksdb_column_family_handle_t>,
 }
 
@@ -77,7 +81,7 @@ impl Drop for DbHandler {
 }
 
 impl Db {
-    pub fn new(column_families: &'static [&'static str]) -> Result<Self> {
+    pub fn new(column_families: Vec<ColumnFamilyDefinition>) -> Result<Self> {
         let path = if cfg!(target_os = "linux") {
             "/dev/shm/".into()
         } else {
@@ -87,13 +91,13 @@ impl Db {
         Ok(Self(Arc::new(Self::do_open(&path, column_families, true)?)))
     }
 
-    pub fn open(path: &Path, column_families: &'static [&'static str]) -> Result<Self> {
+    pub fn open(path: &Path, column_families: Vec<ColumnFamilyDefinition>) -> Result<Self> {
         Ok(Self(Arc::new(Self::do_open(path, column_families, false)?)))
     }
 
     fn do_open(
         path: &Path,
-        column_families: &'static [&'static str],
+        mut column_families: Vec<ColumnFamilyDefinition>,
         in_memory: bool,
     ) -> Result<DbHandler> {
         let c_path = CString::new(
@@ -107,12 +111,16 @@ impl Db {
             assert!(!options.is_null(), "rocksdb_options_create returned null");
             rocksdb_options_set_create_if_missing(options, 1);
             rocksdb_options_set_create_missing_column_families(options, 1);
-            if !in_memory {
             rocksdb_options_set_compression(
                 options,
-                    rocksdb_lz4_compression.try_into().unwrap(),
-                );
+                if in_memory {
+                    rocksdb_no_compression
+                } else {
+                    rocksdb_lz4_compression
                 }
+                .try_into()
+                .unwrap(),
+            );
 
             let txn_options = rocksdb_transactiondb_options_create();
             assert!(
@@ -133,13 +141,12 @@ impl Db {
                 None
             };
 
-            let mut column_families = column_families.to_vec();
-            if !column_families.contains(&"default") {
-                column_families.push("default")
+            if !column_families.iter().any(|c| c.name == "default") {
+                column_families.push(ColumnFamilyDefinition { name: "default" })
             }
             let c_column_families = column_families
                 .iter()
-                .map(|cf| CString::new(*cf))
+                .map(|cf| CString::new(cf.name))
                 .collect::<std::result::Result<Vec<_>, _>>()
                 .map_err(invalid_input_error)?;
             let cf_options: Vec<*const rocksdb_options_t> = vec![options; column_families.len()];
@@ -226,8 +233,8 @@ impl Db {
     }
 
     pub fn column_family(&self, name: &'static str) -> Option<ColumnFamily> {
-        for (cf_name, cf_handle) in self.0.column_families.iter().zip(&self.0.cf_handles) {
-            if *cf_name == name {
+        for (cf, cf_handle) in self.0.column_families.iter().zip(&self.0.cf_handles) {
+            if cf.name == name {
                 return Some(ColumnFamily(*cf_handle));
             }
         }

lib/src/store.rs

@@ -33,6 +33,7 @@ use crate::storage::io::{dump_dataset, dump_graph, load_dataset, load_graph};
 use crate::storage::numeric_encoder::{Decoder, EncodedQuad, EncodedTerm};
 use crate::storage::{ChainedDecodingQuadIterator, DecodingGraphIterator, Storage};
 use std::io::{BufRead, Write};
+#[cfg(not(target_arch = "wasm32"))]
 use std::path::Path;
 use std::{fmt, io, str};