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109 changes: 109 additions & 0 deletions
109
src/main/kotlin/gg/essential/vigilance/impl/migration.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package gg.essential.vigilance.impl | ||
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| import gg.essential.vigilance.impl.nightconfig.core.Config | ||
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| private const val META_KEY = "__meta" | ||
| private val VERSION_KEY = listOf(META_KEY, "version") | ||
| private fun migrationLogKey(migration: Int): List<String> = listOf(META_KEY, "migration_log", "$migration") | ||
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| private typealias Migration = (MutableMap<String, Any?>) -> Unit | ||
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| internal fun migrate(root: Config, migrations: List<Migration>) { | ||
| val fileVersion = root[VERSION_KEY] ?: 0 | ||
| if (fileVersion < migrations.size) { | ||
| var oldMap = root.toMap() | ||
| for (migration in fileVersion until migrations.size) { | ||
| val newMap = oldMap.toMutableMap() | ||
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| migrations[migration](newMap) | ||
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| applyMigration(root, migration, oldMap, newMap) | ||
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| root.update(VERSION_KEY, migration + 1) | ||
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| oldMap = newMap | ||
| assert(oldMap == root.toMap()) | ||
| } | ||
| } else if (fileVersion > migrations.size) { | ||
| for (migration in fileVersion - 1 downTo migrations.size) { | ||
| rollbackMigration(root, migration) | ||
| root.update(VERSION_KEY, migration) | ||
| } | ||
| } | ||
| } | ||
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| private fun applyMigration(root: Config, migration: Int, oldMap: Map<String, Any?>, newMap: Map<String, Any?>) { | ||
| val migrationLog = root.createSubConfig() | ||
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| for ((key, oldValue) in oldMap) { | ||
| if (key !in newMap) { | ||
| migrationLog.update(listOf("changed", key), oldValue) | ||
| root.purge<Any?>(key.split(".")) | ||
| } else { | ||
| val newValue = newMap[key] | ||
| if (newValue != oldValue) { | ||
| migrationLog.update(listOf("changed", key), oldValue) | ||
| root.update(key, newValue) | ||
| } | ||
| } | ||
| } | ||
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| val added = mutableListOf<String>() | ||
| for ((key, newValue) in newMap) { | ||
| if (key !in oldMap) { | ||
| added.add(key) | ||
| root.update(key, newValue) | ||
| } | ||
| } | ||
| if (added.isNotEmpty()) { | ||
| migrationLog.update(listOf("added"), added) | ||
| } | ||
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| if (!migrationLog.isEmpty) { | ||
| root.update(migrationLogKey(migration), migrationLog) | ||
| } | ||
| } | ||
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| private fun rollbackMigration(root: Config, migration: Int) { | ||
| val migrationLog = root.purge<Config?>(migrationLogKey(migration)) ?: return | ||
| val added = migrationLog.get<List<String>>(listOf("added")) ?: emptyList() | ||
| val changed = migrationLog.get<Config>(listOf("changed"))?.valueMap() ?: emptyMap() | ||
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| for (key in added) { | ||
| root.purge<Any?>(key.split(".")) | ||
| } | ||
| for ((key, oldValue) in changed) { | ||
| root.update(key, oldValue) | ||
| } | ||
| } | ||
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| /** Removes the value at the given key as well as any now-empty intermediate nodes. */ | ||
| private fun <T> Config.purge(keys: List<String>): T? { | ||
| return if (keys.size > 1) { | ||
| val child = get<Any?>(listOf(keys[0])) as? Config ?: return null | ||
| val removed = child.purge<T>(keys.subList(1, keys.size)) | ||
| if (child.isEmpty) { | ||
| remove<Any?>(listOf(keys[0])) | ||
| } | ||
| removed | ||
| } else { | ||
| remove(keys) | ||
| } | ||
| } | ||
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| /** Converts the nested [Config] into a flat [Map]. Does not include any [META_KEY] entries. */ | ||
| private fun Config.toMap(): Map<String, Any?> { | ||
| val result = mutableMapOf<String, Any?>() | ||
| fun visit(config: Config, prefix: String) { | ||
| for ((key, value) in config.valueMap()) { | ||
| if (key == META_KEY) continue | ||
| if (value is Config) { | ||
| visit(value, "$prefix$key.") | ||
| } else { | ||
| result[prefix + key] = value | ||
| } | ||
| } | ||
| } | ||
| visit(this, "") | ||
| return result | ||
| } |
148 changes: 148 additions & 0 deletions
148
src/test/kotlin/gg/essential/vigilance/impl/MigrationTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| package gg.essential.vigilance.impl | ||
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| import gg.essential.vigilance.impl.nightconfig.core.Config | ||
| import org.junit.jupiter.api.Assertions.assertEquals | ||
| import org.junit.jupiter.api.Test | ||
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| class MigrationTest { | ||
| @Test | ||
| fun testUpToDate() { | ||
| val input = config("__meta" to mapOf("version" to 2), "test" to 42) | ||
| migrate(input, listOf({}, {})) | ||
| assertEquals(config("__meta" to mapOf("version" to 2), "test" to 42), input) | ||
| } | ||
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| @Test | ||
| fun testNoOpMigration() { | ||
| val input = config("__meta" to mapOf("version" to 1), "test" to 42) | ||
| migrate(input, listOf({}, {})) | ||
| assertEquals(config("__meta" to mapOf("version" to 2), "test" to 42), input) | ||
| } | ||
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| @Test | ||
| fun testAddMigration() { | ||
| val input = config("__meta" to mapOf("version" to 1), "test" to 42) | ||
| migrate(input, listOf({}, { it["new"] = 43 })) | ||
| assertEquals(config( | ||
| "__meta" to mapOf("version" to 2, "migration_log" to mapOf("1" to mapOf("added" to listOf("new")))), | ||
| "test" to 42, | ||
| "new" to 43, | ||
| ), input) | ||
| } | ||
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| @Test | ||
| fun testChangeMigration() { | ||
| val input = config("__meta" to mapOf("version" to 1), "test" to 42) | ||
| migrate(input, listOf({}, { it["test"] = it["test"] as Int + 1 })) | ||
| assertEquals(config( | ||
| "__meta" to mapOf("version" to 2, "migration_log" to mapOf("1" to mapOf("changed" to mapOf("test" to 42)))), | ||
| "test" to 43, | ||
| ), input) | ||
| } | ||
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| @Test | ||
| fun testRemoveMigration() { | ||
| val input = config("__meta" to mapOf("version" to 1), "test" to 42) | ||
| migrate(input, listOf({}, { it.remove("test") })) | ||
| assertEquals(config( | ||
| "__meta" to mapOf("version" to 2, "migration_log" to mapOf("1" to mapOf("changed" to mapOf("test" to 42)))), | ||
| ), input) | ||
| } | ||
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| @Test | ||
| fun testMultipleMigrations() { | ||
| val input = config("__meta" to mapOf("version" to 1), "test" to 42) | ||
| migrate(input, listOf({}, { it["test"] = 1 }, { it["test"] = it["test"] as Int + 1 })) | ||
| assertEquals(config( | ||
| "__meta" to mapOf("version" to 3, "migration_log" to mapOf( | ||
| "1" to mapOf("changed" to mapOf("test" to 42)), | ||
| "2" to mapOf("changed" to mapOf("test" to 1)), | ||
| )), | ||
| "test" to 2, | ||
| ), input) | ||
| } | ||
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| @Test | ||
| fun testAddRollback() { | ||
| val input = config( | ||
| "__meta" to mapOf("version" to 2, "migration_log" to mapOf("1" to mapOf("added" to listOf("new")))), | ||
| "test" to 42, | ||
| "new" to 43, | ||
| ) | ||
| migrate(input, listOf {}) | ||
| assertEquals(config("__meta" to mapOf("version" to 1), "test" to 42), input) | ||
| } | ||
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| @Test | ||
| fun testChangeRollback() { | ||
| val input = config( | ||
| "__meta" to mapOf("version" to 2, "migration_log" to mapOf("1" to mapOf("changed" to mapOf("test" to 42)))), | ||
| "test" to 43, | ||
| ) | ||
| migrate(input, listOf {}) | ||
| assertEquals(config("__meta" to mapOf("version" to 1), "test" to 42), input) | ||
| } | ||
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| @Test | ||
| fun testRemoveRollback() { | ||
| val input = config( | ||
| "__meta" to mapOf("version" to 2, "migration_log" to mapOf("1" to mapOf("changed" to mapOf("test" to 42)))), | ||
| ) | ||
| migrate(input, listOf {}) | ||
| assertEquals(config("__meta" to mapOf("version" to 1), "test" to 42), input) | ||
| } | ||
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| @Test | ||
| fun testMultipleRollback() { | ||
| val input = config( | ||
| "__meta" to mapOf("version" to 3, "migration_log" to mapOf( | ||
| "1" to mapOf("changed" to mapOf("test" to 42)), | ||
| "2" to mapOf("changed" to mapOf("test" to 1)), | ||
| )), | ||
| "test" to 2, | ||
| ) | ||
| migrate(input, listOf {}) | ||
| assertEquals(config("__meta" to mapOf("version" to 1), "test" to 42), input) | ||
| } | ||
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| @Test | ||
| fun testNoMigrations() { | ||
| val input = config("test" to 42) | ||
| migrate(input, listOf()) | ||
| assertEquals(config("test" to 42), input) | ||
| } | ||
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| @Test | ||
| fun testInitialMigration() { | ||
| val input = config("test" to 42) | ||
| migrate(input, listOf { config -> | ||
| assert(config == mapOf("test" to 42)) | ||
| config["test"] = 43 | ||
| }) | ||
| assertEquals(config( | ||
| "__meta" to mapOf("version" to 1, "migration_log" to mapOf("0" to mapOf("changed" to mapOf("test" to 42)))), | ||
| "test" to 43, | ||
| ), input) | ||
| } | ||
|
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| private fun config(vararg entries: Pair<String, Any?>): Config = | ||
| config(entries.toMap()) | ||
|
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| private fun config(map: Map<String, Any?>): Config { | ||
| fun visit(map: Map<String, Any?>, config: Config) { | ||
| for ((key, value) in map) { | ||
| if (value is Map<*, *>) { | ||
| val inner = config.createSubConfig() | ||
| @Suppress("UNCHECKED_CAST") | ||
| visit(value as Map<String, Any?>, inner) | ||
| config.update(listOf(key), inner) | ||
| } else { | ||
| config.update(listOf(key), value) | ||
| } | ||
| } | ||
| } | ||
| val config = Config.inMemory() | ||
| visit(map, config) | ||
| return config | ||
| } | ||
| } |