own the state

Signed-off-by: Tobias Gurtzick <[email protected]>

lib/state.js

@@ -1,33 +1,68 @@
 const MSTATE = '__dbmigrate_state__';
 const SSTATE = '__dbmigrate_schema__';
+const RUNON =
+ 'run_on';
+
 const log = require('db-migrate-shared').log;
 const fs = require('fs').promises;
 const path = require('path');
+const crypto = require('crypto');
+
+const ID = crypto.randomBytes(32).toString('base64');
+let owner = false;
 
 module.exports = {
+ /**
+ * Lock state will add the basic state controller an ID
+ * and a process controlled date.
+ * It is important that all systems are in sync. We will use the
+ * database clock instead if possible.
+ */
  lockState: async function (driver, state, internals) {
  if (!state) {
+ owner = true;
  return driver._insertKV(
  internals.migrationState,
  MSTATE,
  JSON.stringify({
  s: {
  step: 0,
  fin: 0,
+ ID,
  date: new Date()
  }
  })
  );
  } else {
+ let runOn = state.run_on;
  state = state.value;
  state = JSON.parse(state);
- state.s.date = new Date();
- return driver._updateKV(
+
+ if (!state.s.ID || state.s.ID !== ID) {
+ owner = true;
+ state.s.ID = ID;
+ }
+
+ const d = new Date();
+
+ state.s.date = d;
+ await driver._updateKVC(
  internals.migrationState,
  MSTATE,
-
- JSON.stringify(state)
+ JSON.stringify(state),
+ RUNON,
+ runOn
  );
+
+ state = await driver._getKV(internals.migrationState, MSTATE);
+
+ runOn = state.run_on;
+ state = state.value;
+ state = JSON.parse(state);
+
+ if (state.s.ID !== ID) {
+ owner = false;
+ }
  }
  },
 
@@ -165,6 +200,9 @@ module.exports = {
  state.s.date = new Date();
  state.s.fin = 1;
 
+ // unlock from current process
+ state.s.ID = 0;
+
  return driver._updateKV(
  internals.migrationState,
  MSTATE,