consolidate

rocksdb_shim/rocksdb_shim.cc

@@ -1,22 +1,167 @@
-// TODO: In order to use RocksDB's WAL replication helpers, we need to import the C++ library so we use this shim
-/**
-	C++ shim implementation notes (the important bits)
+#include "rocksdb_shim.h"
+#include <rocksdb/db.h>
+#include <rocksdb/options.h>
+#include <rocksdb/slice.h>
+#include <cstring>
+#include <string>
 
-	In this rocksdb_shim.cc we'll need to use:
+// Internal structure wrapping rocksdb::DB
+struct jormun_db {
+    rocksdb::DB* db;
+};
 
-	rocksdb::DB::Open(...)
+// Placeholder for WAL iterator (not implemented yet)
+struct jormun_wal_iter {
+    // TODO: Implement with TransactionLogIterator when needed
+    void* placeholder;
+};
 
-	db->GetLatestSequenceNumber()
+// Open database
+jormun_db* jormun_db_open(const char* path, int create_if_missing, char** err) {
+    rocksdb::Options options;
+    options.create_if_missing = create_if_missing != 0;
+    
+    rocksdb::DB* db_ptr = nullptr;
+    rocksdb::Status status = rocksdb::DB::Open(options, path, &db_ptr);
+    
+    if (!status.ok()) {
+        if (err) {
+            std::string error_msg = status.ToString();
+            *err = strdup(error_msg.c_str());
+        }
+        return nullptr;
+    }
+    
+    jormun_db* jdb = new jormun_db;
+    jdb->db = db_ptr;
+    return jdb;
+}
 
-	db->GetUpdatesSince(seq, &iter)
+// Close database
+void jormun_db_close(jormun_db* db) {
+    if (db) {
+        delete db->db;
+        delete db;
+    }
+}
 
-	from each TransactionLogIterator entry:
+// Put key-value pair
+void jormun_db_put(jormun_db* db,
+                   const void* key, size_t keylen,
+                   const void* val, size_t vallen,
+                   char** err) {
+    if (!db || !db->db) {
+        if (err) *err = strdup("Database is null");
+        return;
+    }
+    
+    rocksdb::WriteOptions write_options;
+    rocksdb::Slice key_slice(static_cast<const char*>(key), keylen);
+    rocksdb::Slice val_slice(static_cast<const char*>(val), vallen);
+    
+    rocksdb::Status status = db->db->Put(write_options, key_slice, val_slice);
+    
+    if (!status.ok() && err) {
+        std::string error_msg = status.ToString();
+        *err = strdup(error_msg.c_str());
+    }
+}
 
-	get WriteBatch and serialize via WriteBatch::Data()
+// Get value for key
+unsigned char* jormun_db_get(jormun_db* db,
+                             const void* key, size_t keylen,
+                             size_t* vallen,
+                             char** err) {
+    if (!db || !db->db) {
+        if (err) *err = strdup("Database is null");
+        return nullptr;
+    }
+    
+    rocksdb::ReadOptions read_options;
+    rocksdb::Slice key_slice(static_cast<const char*>(key), keylen);
+    std::string value;
+    
+    rocksdb::Status status = db->db->Get(read_options, key_slice, &value);
+    
+    if (status.IsNotFound()) {
+        *vallen = 0;
+        return nullptr;
+    }
+    
+    if (!status.ok()) {
+        if (err) {
+            std::string error_msg = status.ToString();
+            *err = strdup(error_msg.c_str());
+        }
+        return nullptr;
+    }
+    
+    // Allocate and copy value
+    *vallen = value.size();
+    unsigned char* result = static_cast<unsigned char*>(malloc(value.size()));
+    if (result) {
+        memcpy(result, value.data(), value.size());
+    }
+    
+    return result;
+}
 
-	apply via rocksdb::WriteBatch wb(data); db->Write(write_options, &wb);
+// Free memory allocated by the shim
+void jormun_free(void* p) {
+    free(p);
+}
 
-	Also we must configure WAL retention so the followers don’t fall off the end. RocksDB warns the iterator can become invalid if WAL is cleared aggressively; typical controls are WAL TTL / size limit.
+// ============================================================================
+// WAL Replication Functions (Stubs for now - to be implemented)
+// ============================================================================
 
-	https://github.com/facebook/rocksdb/issues/1565
- */
+// Get latest sequence number
+uint64_t jormun_latest_sequence(jormun_db* db) {
+    if (!db || !db->db) return 0;
+    return db->db->GetLatestSequenceNumber();
+}
+
+// Create WAL iterator (stub)
+jormun_wal_iter* jormun_wal_iter_create(jormun_db* db, uint64_t seq, char** err) {
+    (void)db;
+    (void)seq;
+    if (err) {
+        *err = strdup("WAL iteration not yet implemented");
+    }
+    return nullptr;
+}
+
+// Destroy WAL iterator (stub)
+void jormun_wal_iter_destroy(jormun_wal_iter* it) {
+    if (it) {
+        delete it;
+    }
+}
+
+// Get next batch from WAL (stub)
+int jormun_wal_iter_next(jormun_wal_iter* it,
+                         uint64_t* batch_start_seq,
+                         unsigned char** out_data,
+                         size_t* out_len,
+                         char** err) {
+    (void)it;
+    (void)batch_start_seq;
+    (void)out_data;
+    (void)out_len;
+    if (err) {
+        *err = strdup("WAL iteration not yet implemented");
+    }
+    return 0;
+}
+
+// Apply write batch (stub)
+void jormun_apply_writebatch(jormun_db* db,
+                             const unsigned char* data, size_t len,
+                             char** err) {
+    (void)db;
+    (void)data;
+    (void)len;
+    if (err) {
+        *err = strdup("WAL apply not yet implemented");
+    }
+}