Initial commit

node_modules/knex/lib/dialects/oracledb/transaction.js

@@ -0,0 +1,98 @@
+const Transaction = require('../../execution/transaction');
+const { timeout, KnexTimeoutError } = require('../../util/timeout');
+const debugTx = require('debug')('knex:tx');
+
+// There's also a "read only", but that's not really an "isolationLevel"
+const supportedIsolationLevels = ['read committed', 'serializable'];
+// Remove this if you make it work and set it to true
+const isIsolationLevelEnabled = false;
+
+module.exports = class Oracle_Transaction extends Transaction {
+  // disable autocommit to allow correct behavior (default is true)
+  begin(conn) {
+    if (this.isolationLevel) {
+      if (isIsolationLevelEnabled) {
+        if (!supportedIsolationLevels.includes(this.isolationLevel)) {
+          this.client.logger.warn(
+            'Oracle only supports read committed and serializable transactions, ignoring the isolation level param'
+          );
+        } else {
+          // I tried this, but it didn't work
+          // Doc here: https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/SET-TRANSACTION.html
+          return this.query(conn, `SET TRANSACTION ${this.isolationLevel}`);
+        }
+      } else {
+        this.client.logger.warn(
+          'Transaction isolation is not currently supported for Oracle'
+        );
+      }
+    }
+    return Promise.resolve();
+  }
+
+  async commit(conn, value) {
+    this._completed = true;
+    try {
+      await conn.commitAsync();
+      this._resolver(value);
+    } catch (err) {
+      this._rejecter(err);
+    }
+  }
+
+  release(conn, value) {
+    return this._resolver(value);
+  }
+
+  rollback(conn, err) {
+    this._completed = true;
+    debugTx('%s: rolling back', this.txid);
+    return timeout(conn.rollbackAsync(), 5000)
+      .catch((e) => {
+        if (!(e instanceof KnexTimeoutError)) {
+          return Promise.reject(e);
+        }
+        this._rejecter(e);
+      })
+      .then(() => {
+        if (err === undefined) {
+          if (this.doNotRejectOnRollback) {
+            this._resolver();
+            return;
+          }
+          err = new Error(`Transaction rejected with non-error: ${err}`);
+        }
+        this._rejecter(err);
+      });
+  }
+
+  savepoint(conn) {
+    return this.query(conn, `SAVEPOINT ${this.txid}`);
+  }
+
+  async acquireConnection(config, cb) {
+    const configConnection = config && config.connection;
+
+    const connection =
+      configConnection || (await this.client.acquireConnection());
+    try {
+      connection.__knexTxId = this.txid;
+      connection.isTransaction = true;
+      return await cb(connection);
+    } finally {
+      debugTx('%s: releasing connection', this.txid);
+      connection.isTransaction = false;
+      try {
+        await connection.commitAsync();
+      } catch (err) {
+        this._rejecter(err);
+      } finally {
+        if (!configConnection) {
+          await this.client.releaseConnection(connection);
+        } else {
+          debugTx('%s: not releasing external connection', this.txid);
+        }
+      }
+    }
+  }
+};