feat(catalog): extend Catalog with renameInList and replaceTable
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dualfroz committed
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db58d7127a
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+192
-8
@@ -577,23 +577,135 @@ class Catalog {
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val dependents = if (stillEnforced) emptyList() else tables.values.filter { other -> other.schema.foreignKeys.any(::dependsOnTarget) }
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if (!cascade && dependents.isNotEmpty()) {
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val names = dependents.map { it.schema.name }.distinct()
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throw KestrelException(
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"cannot drop constraint ${unique.name} because table(s) ${names.joinToString(", ")} have a " +
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"FOREIGN KEY referencing it; use CASCADE"
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)
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}
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for (other in dependents) {
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val key = other.schema.name.lowercase()
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val newSchema = TableSchema(
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other.schema.name, other.schema.columns, other.schema.foreignKeys.filterNot(::dependsOnTarget),
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other.schema.checks, other.schema.uniqueConstraints, other.schema.compositePrimaryKey, other.schema.temporary
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)
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val replacement = Table(newSchema)
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replacement.rows.addAll(other.rows)
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tables[key] = replacement
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}
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// Re-fetched: a self-referencing FOREIGN KEY on tableName itself may have just been rewritten
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// above (dependents is not restricted to OTHER tables - a self-reference is a real dependent
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// here, unlike dropDependentForeignKeys' table-drop case where it disappears for free).
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val current = table(tableName)
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val newSchema = TableSchema(
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current.schema.name, current.schema.columns, current.schema.foreignKeys, current.schema.checks,
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current.schema.uniqueConstraints - unique, current.schema.compositePrimaryKey, current.schema.temporary
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)
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replaceTable(tableName, newSchema, current.rows)
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}
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private fun renameInList(names: List<String>, oldName: String, newName: String): List<String> =
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names.map { if (it.equals(oldName, ignoreCase = true)) newName else it }
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private fun replaceTable(tableName: String, newSchema: TableSchema, rows: List<Row>) {
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val key = tableName.lowercase()
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val replacement = Table(newSchema)
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replacement.rows.addAll(rows)
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tables[key] = replacement
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}
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fun table(tableName: String): Table {
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val key = tableName.lowercase()
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tables[key]?.let { return it }
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if (views.containsKey(key)) {
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throw KestrelException("cannot modify view: $tableName")
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}
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throw KestrelException("no such table: $tableName")
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}
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fun tableOrNull(tableName: String): Table? = tables[tableName.lowercase()]
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val tableNames: List<String> get() = tables.values.map { it.schema.name }
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fun createView(name: String, query: QueryStatement, orReplace: Boolean) {
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val key = name.lowercase()
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if (tables.containsKey(key)) {
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throw KestrelException("a table named '$name' already exists")
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}
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if (!orReplace && views.containsKey(key)) {
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throw KestrelException("view '$name' already exists")
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}
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views[key] = ViewDefinition(name, query)
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}
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fun dropView(name: String, cascade: Boolean = false) {
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val key = name.lowercase()
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if (!views.containsKey(key)) {
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if (tables.containsKey(key)) {
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throw KestrelException("'$name' is a table, use DROP TABLE")
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}
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throw KestrelException("no such view: $name")
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}
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dropDependentViews(name, cascade)
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views.remove(key)
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}
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/**
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* Computes the full transitive closure of views depending on [name] (directly or
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* through other views) before touching anything, so a "diamond" - two different
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* dependents that both end up pulling in the same further-removed view - can't
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* make a later removal fail with "no such view" because an earlier one already
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* deleted it.
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*/
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private fun dropDependentViews(name: String, cascade: Boolean) {
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val closure = transitiveViewDependents(name.lowercase())
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if (closure.isEmpty()) return
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if (!cascade) {
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val names = closure.mapNotNull { views[it]?.name }
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throw KestrelException(
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"cannot drop '$name' because view(s) ${names.joinToString(", ")} depend on it; use CASCADE"
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)
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}
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for (key in closure) views.remove(key)
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}
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private fun transitiveViewDependents(rootKey: String): Set<String> {
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val found = linkedSetOf<String>()
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var frontier = setOf(rootKey)
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while (true) {
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val next = views.values
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.filter { it.name.lowercase() != rootKey && it.name.lowercase() !in found }
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.filter { view -> frontier.any { DependencyAnalysis.referencesRelation(view.query, it) } }
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.map { it.name.lowercase() }
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.toSet()
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if (next.isEmpty()) return found
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found.addAll(next)
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frontier = next
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}
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}
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fun viewOrNull(name: String): ViewDefinition? = views[name.lowercase()]
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val viewNames: List<String> get() = views.values.map { it.name }
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fun createIndex(definition: IndexDefinition) {
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val key = definition.name.lowercase()
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if (indexes.containsKey(key)) {
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throw KestrelException("index '${definition.name}' already exists")
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}
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require(definition.columnNames.isNotEmpty()) { "index must cover at least one column" }
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val table = table(definition.tableName)
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if (table.schema.columnIndex(definition.columnName) == null) {
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throw KestrelException("no such column: ${definition.columnName} in table ${definition.tableName}")
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for (columnName in definition.columnNames) {
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if (table.schema.columnIndex(columnName) == null) {
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throw KestrelException("no such column: $columnName in table ${definition.tableName}")
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}
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}
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val index = SortedIndex(definition)
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indexes[key] = index
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// Populated before registering in [indexes] so that a UNIQUE index created over a table
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// with pre-existing duplicate values fails cleanly, without leaving a half-built index
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// behind for later statements to trip over.
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val index = SortedIndex(definition, collationsFor(table.schema, definition.columnNames))
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reindexOne(table, index)
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indexes[key] = index
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}
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fun dropIndex(indexName: String) {
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@@ -602,9 +714,9 @@ class Catalog {
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}
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}
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fun indexOn(tableName: String, columnName: String): SortedIndex? = indexes.values.firstOrNull {
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it.definition.tableName.equals(tableName, ignoreCase = true) &&
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it.definition.columnName.equals(columnName, ignoreCase = true)
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/** Every index defined on [tableName], single-column or composite, in creation order. */
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fun indexesOn(tableName: String): List<SortedIndex> = indexes.values.filter {
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it.definition.tableName.equals(tableName, ignoreCase = true)
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}
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val indexNames: List<String> get() = indexes.values.map { it.definition.name }
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@@ -618,9 +730,81 @@ class Catalog {
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.forEach { reindexOne(table, it) }
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}
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/**
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* Fires in [name]'s creation order for a given table/timing/event, matching the order
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* multiple triggers on the same event fire in Postgres/SQLite.
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*/
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fun createTrigger(definition: TriggerDefinition) {
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val key = definition.name.lowercase()
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if (triggers.containsKey(key)) {
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throw KestrelException("trigger '${definition.name}' already exists")
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}
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table(definition.tableName)
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triggers[key] = definition
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}
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fun dropTrigger(name: String) {
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if (triggers.remove(name.lowercase()) == null) {
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throw KestrelException("no such trigger: $name")
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}
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}
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fun triggersOn(tableName: String, timing: TriggerTiming, event: TriggerEvent): List<TriggerDefinition> =
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triggers.values.filter {
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it.tableName.equals(tableName, ignoreCase = true) && it.timing == timing && it.event == event
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}
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fun hasTriggers(tableName: String): Boolean = triggers.values.any { it.tableName.equals(tableName, ignoreCase = true) }
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val triggerNames: List<String> get() = triggers.values.map { it.name }
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fun triggerDefinitions(): List<TriggerDefinition> = triggers.values.toList()
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/**
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* `name` must not already be a sequence (redundant CREATE); unlike tables/views, sequence
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* names live in their own namespace here (Postgres puts them in the same relation namespace as
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* tables, but this engine has no need for that overlap check to matter for anything it
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* implements).
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*/
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fun createSequence(definition: SequenceDefinition) {
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val key = definition.name.lowercase()
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if (sequences.containsKey(key)) {
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throw KestrelException("sequence '${definition.name}' already exists")
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}
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sequences[key] = Sequence(definition)
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}
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fun dropSequence(name: String) {
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if (sequences.remove(name.lowercase()) == null) {
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throw KestrelException("no such sequence: $name")
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}
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}
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/**
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* Always installs a brand new [Sequence] instance (via [Sequence.altered]) rather than mutating
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* the existing one in place - see [Sequence]'s own doc for why that is what makes ALTER SEQUENCE
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* (unlike NEXTVAL) transactional.
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*/
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fun alterSequence(name: String, newDefinition: SequenceDefinition, restartAt: Long?) {
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val key = name.lowercase()
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val existing = sequences[key] ?: throw KestrelException("no such sequence: $name")
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sequences[key] = existing.altered(newDefinition, restartAt)
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}
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fun sequence(name: String): Sequence = sequenceOrNull(name) ?: throw KestrelException("no such sequence: $name")
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fun sequenceOrNull(name: String): Sequence? = sequences[name.lowercase()]
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val sequenceNames: List<String> get() = sequences.values.map { it.definition.name }
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fun sequenceDefinitions(): List<SequenceDefinition> = sequences.values.map { it.definition }
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fun snapshot(): CatalogSnapshot = CatalogSnapshot(
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tables = tables.mapValues { (_, table) -> table.schema to table.rows.toList() },
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indexDefinitions = indexes.values.map { it.definition }
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indexDefinitions = indexes.values.map { it.definition },
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views = views.toMap(),
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triggers = triggers.toMap(),
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sequences = sequences.toMap()
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)
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fun restore(snapshot: CatalogSnapshot) {
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