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use crate::_internal::analysis::mutations::Mutation;
use crate::_internal::ast::identifiers::ObjectId;
use crate::_internal::report::violations::{ObjectKind, OperationKind, Violation, ViolationTier};
use crate::_internal::rules::{BASELINE_RELATION_CAPABILITIES, Rule, RuleCapability, RuleContext};
pub struct DriftDetectionRule;
impl Rule for DriftDetectionRule {
fn id(&self) -> &'static str {
"schema-drift"
}
fn default_tier(&self) -> ViolationTier {
ViolationTier::Tier1
}
fn recipe(&self) -> &'static str {
"This migration references a database object that does not exist in the production baseline. If this object exists in production, sync the cache with `safe-migrate sync`. If it does not, this migration may fail."
}
fn required_capabilities(&self) -> &'static [RuleCapability] {
BASELINE_RELATION_CAPABILITIES
}
fn evaluate(&self, context: &RuleContext<'_>) -> Vec<Violation> {
// A missing cache is not proof that production lacks an object. Keep
// the stateful analyzer useful offline without turning every ALTER or
// DROP into a false blocking baseline-drift finding.
if !context.state().baseline_is_available() {
return Vec::new();
}
let pre_state = context.pre_state();
let state = context.state();
let mut violations = Vec::new();
match context.mutation() {
Mutation::Opaque(
crate::_internal::analysis::mutations::OpaqueMutation::UnresolvedReference {
object_kind,
object_name,
},
) => {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::UnresolvedReference,
object_kind: object_kind.clone(),
object_name: object_name.clone(),
tier: self.default_tier(),
reason: format!(
"Migration references {} \"{}\" which does not exist in the production baseline",
object_kind,
object_name
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
Mutation::DropTable(d) => {
if !d.if_exists {
for id in &d.ids {
if !pre_state.relations.contains_key(id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropTable,
object_kind: ObjectKind::Table,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs table \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
}
Mutation::AlterTable(a) => {
if !pre_state.relations.contains_key(&a.id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::Other("alter_table".to_string()),
object_kind: ObjectKind::Table,
object_name: a.id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration ALTERs table \"{}\" which does not exist in the production baseline",
a.id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
Mutation::DropView(d) => {
for id in &d.ids {
if !d.if_exists && !pre_state.relations.contains_key(id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropView,
object_kind: ObjectKind::View,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs view \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::DropMaterializedView(d) => {
for id in &d.ids {
if !d.if_exists && !pre_state.relations.contains_key(id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropMaterializedView,
object_kind: ObjectKind::MaterializedView,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs materialized view \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::DropSequence(d) => {
for id in &d.ids {
if !d.if_exists && !pre_state.sequences.contains_key(id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropSequence,
object_kind: ObjectKind::Sequence,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs sequence \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::DropFunction(d) => {
for sig in &d.signatures {
let sig_str = format!("{}({})", sig.name.name.resolve(), sig.params.join(","));
let schema = state.resolve_function_schema(&sig.name, &sig_str);
let id = ObjectId::new(schema, sig_str);
if !d.if_exists && !pre_state.functions.contains_key(&id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropFunction,
object_kind: ObjectKind::Function,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs function \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::DropIndex(d) => {
for id in &d.ids {
if !d.if_exists && !pre_state.indexes.iter().any(|idx| idx.dependent == *id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropIndex,
object_kind: ObjectKind::Index,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs index \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::DropDomain(d) => {
for id in &d.ids {
if !d.if_exists && !pre_state.types.contains_key(id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropDomain,
object_kind: ObjectKind::Domain,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs domain \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::DropType(d) => {
for id in &d.ids {
if !d.if_exists && !pre_state.types.contains_key(id) {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropType,
object_kind: ObjectKind::Type,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs type \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::Rename(r) => {
if !pre_state.relations.contains_key(&r.old_id)
&& !pre_state.types.contains_key(&r.old_id)
&& !pre_state.sequences.contains_key(&r.old_id)
&& !pre_state
.indexes
.iter()
.any(|idx| idx.dependent == r.old_id)
{
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::Rename,
object_kind: ObjectKind::Table, // Or general
object_name: r.old_id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration RENAMEs object \"{}\" which does not exist in the production baseline",
r.old_id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
Mutation::AlterType(a) if !pre_state.types.contains_key(&a.id) => {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::AlterType,
object_kind: ObjectKind::Type,
object_name: a.id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration ALTERs type \"{}\" which does not exist in the production baseline",
a.id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
Mutation::AlterFunction(f) if !pre_state.functions.contains_key(&f.id) => {
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::AlterFunction,
object_kind: ObjectKind::Function,
object_name: f.id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration ALTERs function \"{}\" which does not exist in the production baseline",
f.id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
Mutation::DropProcedure(d) => {
for signature in &d.signatures {
let signature_name = format!(
"{}({})",
signature.name.name.resolve(),
signature.params.join(",")
);
let schema = state.resolve_function_schema(&signature.name, &signature_name);
let id = ObjectId::new(schema, signature_name);
let procedure_exists = pre_state.functions.get(&id).is_some_and(|routine| {
routine.routine_kind
== crate::_internal::model::function::RoutineKind::Procedure
});
if !d.if_exists && !procedure_exists {
violations.push(Violation {
source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::DropProcedure,
object_kind: ObjectKind::Procedure,
object_name: id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration DROPs procedure \"{}\" which does not exist in the production baseline",
id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
}
Mutation::AlterProcedure(procedure) => {
let procedure_exists =
pre_state
.functions
.get(&procedure.id)
.is_some_and(|routine| {
routine.routine_kind
== crate::_internal::model::function::RoutineKind::Procedure
});
if !procedure_exists {
violations.push(Violation {
source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::AlterProcedure,
object_kind: ObjectKind::Procedure,
object_name: procedure.id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration ALTERs procedure \"{}\" which does not exist in the production baseline",
procedure.id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
Mutation::CreateTable(c) => {
// Warn if parent table doesn't exist for partitioned tables
if let Some(parent_id) = &c.partition_of
&& !pre_state.relations.contains_key(parent_id)
{
violations.push(Violation { source_range: None,
rule_id: self.id(),
operation_kind: OperationKind::CreateTable,
object_kind: ObjectKind::Table,
object_name: c.id.to_string(),
tier: self.default_tier(),
reason: format!(
"Migration creates {} as a partition of parent \"{}\" which does not exist in the production baseline. Parent must be created first.",
c.id, parent_id
),
recipe: self.recipe(),
dedup_key: None,
sql: None,
fk_dependency_related: false,
});
}
}
_ => {}
}
// When sync was deliberately scoped, an omitted schema is unknown,
// not proof of production drift. Keep the warning, but make it a
// coverage warning rather than a false Tier 1 absence claim.
for violation in &mut violations {
if let Some(schema) =
state.baseline_scope_omits_displayed_object(&violation.object_name)
{
violation.tier = ViolationTier::Tier2;
violation.reason = format!(
"Cache does not cover schema \"{}\"; safe-migrate cannot verify whether {} exists in the production baseline",
schema, violation.object_name
);
violation.recipe = "Run `safe-migrate sync --schemas ...` with this schema included, or use an unscoped sync, before treating this as a production-drift result.";
}
}
violations
}
}