1 files changed, 241 insertions, 0 deletions
diff --git a/vendor/github.com/uptrace/bun/migrate/sqlschema/inspector.go b/vendor/github.com/uptrace/bun/migrate/sqlschema/inspector.go
new file mode 100644
index 000000000..fc9af06fc
--- /dev/null
+++ b/vendor/github.com/uptrace/bun/migrate/sqlschema/inspector.go
@@ -0,0 +1,241 @@
+package sqlschema
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/schema"
+	orderedmap "github.com/wk8/go-ordered-map/v2"
+)
+
+type InspectorDialect interface {
+	schema.Dialect
+
+	// Inspector returns a new instance of Inspector for the dialect.
+	// Dialects MAY set their default InspectorConfig values in constructor
+	// but MUST apply InspectorOptions to ensure they can be overriden.
+	//
+	// Use ApplyInspectorOptions to reduce boilerplate.
+	NewInspector(db *bun.DB, options ...InspectorOption) Inspector
+
+	// CompareType returns true if col1 and co2 SQL types are equivalent,
+	// i.e. they might use dialect-specifc type aliases (SERIAL ~ SMALLINT)
+	// or specify the same VARCHAR length differently (VARCHAR(255) ~ VARCHAR).
+	CompareType(Column, Column) bool
+}
+
+// InspectorConfig controls the scope of migration by limiting the objects Inspector should return.
+// Inspectors SHOULD use the configuration directly instead of copying it, or MAY choose to embed it,
+// to make sure options are always applied correctly.
+type InspectorConfig struct {
+	// SchemaName limits inspection to tables in a particular schema.
+	SchemaName string
+
+	// ExcludeTables from inspection.
+	ExcludeTables []string
+}
+
+// Inspector reads schema state.
+type Inspector interface {
+	Inspect(ctx context.Context) (Database, error)
+}
+
+func WithSchemaName(schemaName string) InspectorOption {
+	return func(cfg *InspectorConfig) {
+		cfg.SchemaName = schemaName
+	}
+}
+
+// WithExcludeTables works in append-only mode, i.e. tables cannot be re-included.
+func WithExcludeTables(tables ...string) InspectorOption {
+	return func(cfg *InspectorConfig) {
+		cfg.ExcludeTables = append(cfg.ExcludeTables, tables...)
+	}
+}
+
+// NewInspector creates a new database inspector, if the dialect supports it.
+func NewInspector(db *bun.DB, options ...InspectorOption) (Inspector, error) {
+	dialect, ok := (db.Dialect()).(InspectorDialect)
+	if !ok {
+		return nil, fmt.Errorf("%s does not implement sqlschema.Inspector", db.Dialect().Name())
+	}
+	return &inspector{
+		Inspector: dialect.NewInspector(db, options...),
+	}, nil
+}
+
+func NewBunModelInspector(tables *schema.Tables, options ...InspectorOption) *BunModelInspector {
+	bmi := &BunModelInspector{
+		tables: tables,
+	}
+	ApplyInspectorOptions(&bmi.InspectorConfig, options...)
+	return bmi
+}
+
+type InspectorOption func(*InspectorConfig)
+
+func ApplyInspectorOptions(cfg *InspectorConfig, options ...InspectorOption) {
+	for _, opt := range options {
+		opt(cfg)
+	}
+}
+
+// inspector is opaque pointer to a database inspector.
+type inspector struct {
+	Inspector
+}
+
+// BunModelInspector creates the current project state from the passed bun.Models.
+// Do not recycle BunModelInspector for different sets of models, as older models will not be de-registerred before the next run.
+type BunModelInspector struct {
+	InspectorConfig
+	tables *schema.Tables
+}
+
+var _ Inspector = (*BunModelInspector)(nil)
+
+func (bmi *BunModelInspector) Inspect(ctx context.Context) (Database, error) {
+	state := BunModelSchema{
+		BaseDatabase: BaseDatabase{
+			ForeignKeys: make(map[ForeignKey]string),
+		},
+		Tables: orderedmap.New[string, Table](),
+	}
+	for _, t := range bmi.tables.All() {
+		if t.Schema != bmi.SchemaName {
+			continue
+		}
+
+		columns := orderedmap.New[string, Column]()
+		for _, f := range t.Fields {
+
+			sqlType, length, err := parseLen(f.CreateTableSQLType)
+			if err != nil {
+				return nil, fmt.Errorf("parse length in %q: %w", f.CreateTableSQLType, err)
+			}
+			columns.Set(f.Name, &BaseColumn{
+				Name:            f.Name,
+				SQLType:         strings.ToLower(sqlType), // TODO(dyma): maybe this is not necessary after Column.Eq()
+				VarcharLen:      length,
+				DefaultValue:    exprToLower(f.SQLDefault),
+				IsNullable:      !f.NotNull,
+				IsAutoIncrement: f.AutoIncrement,
+				IsIdentity:      f.Identity,
+			})
+		}
+
+		var unique []Unique
+		for name, group := range t.Unique {
+			// Create a separate unique index for single-column unique constraints
+			//  let each dialect apply the default naming convention.
+			if name == "" {
+				for _, f := range group {
+					unique = append(unique, Unique{Columns: NewColumns(f.Name)})
+				}
+				continue
+			}
+
+			// Set the name if it is a "unique group", in which case the user has provided the name.
+			var columns []string
+			for _, f := range group {
+				columns = append(columns, f.Name)
+			}
+			unique = append(unique, Unique{Name: name, Columns: NewColumns(columns...)})
+		}
+
+		var pk *PrimaryKey
+		if len(t.PKs) > 0 {
+			var columns []string
+			for _, f := range t.PKs {
+				columns = append(columns, f.Name)
+			}
+			pk = &PrimaryKey{Columns: NewColumns(columns...)}
+		}
+
+		// In cases where a table is defined in a non-default schema in the `bun:table` tag,
+		// schema.Table only extracts the name of the schema, but passes the entire tag value to t.Name
+		// for backwads-compatibility. For example, a bun model like this:
+		// 	type Model struct { bun.BaseModel `bun:"table:favourite.books` }
+		// produces
+		// 	schema.Table{ Schema: "favourite", Name: "favourite.books" }
+		tableName := strings.TrimPrefix(t.Name, t.Schema+".")
+		state.Tables.Set(tableName, &BunTable{
+			BaseTable: BaseTable{
+				Schema:            t.Schema,
+				Name:              tableName,
+				Columns:           columns,
+				UniqueConstraints: unique,
+				PrimaryKey:        pk,
+			},
+			Model: t.ZeroIface,
+		})
+
+		for _, rel := range t.Relations {
+			// These relations are nominal and do not need a foreign key to be declared in the current table.
+			// They will be either expressed as N:1 relations in an m2m mapping table, or will be referenced by the other table if it's a 1:N.
+			if rel.Type == schema.ManyToManyRelation ||
+				rel.Type == schema.HasManyRelation {
+				continue
+			}
+
+			var fromCols, toCols []string
+			for _, f := range rel.BasePKs {
+				fromCols = append(fromCols, f.Name)
+			}
+			for _, f := range rel.JoinPKs {
+				toCols = append(toCols, f.Name)
+			}
+
+			target := rel.JoinTable
+			state.ForeignKeys[ForeignKey{
+				From: NewColumnReference(t.Name, fromCols...),
+				To:   NewColumnReference(target.Name, toCols...),
+			}] = ""
+		}
+	}
+	return state, nil
+}
+
+func parseLen(typ string) (string, int, error) {
+	paren := strings.Index(typ, "(")
+	if paren == -1 {
+		return typ, 0, nil
+	}
+	length, err := strconv.Atoi(typ[paren+1 : len(typ)-1])
+	if err != nil {
+		return typ, 0, err
+	}
+	return typ[:paren], length, nil
+}
+
+// exprToLower converts string to lowercase, if it does not contain a string literal 'lit'.
+// Use it to ensure that user-defined default values in the models are always comparable
+// to those returned by the database inspector, regardless of the case convention in individual drivers.
+func exprToLower(s string) string {
+	if strings.HasPrefix(s, "'") && strings.HasSuffix(s, "'") {
+		return s
+	}
+	return strings.ToLower(s)
+}
+
+// BunModelSchema is the schema state derived from bun table models.
+type BunModelSchema struct {
+	BaseDatabase
+
+	Tables *orderedmap.OrderedMap[string, Table]
+}
+
+func (ms BunModelSchema) GetTables() *orderedmap.OrderedMap[string, Table] {
+	return ms.Tables
+}
+
+// BunTable provides additional table metadata that is only accessible from scanning bun models.
+type BunTable struct {
+	BaseTable
+
+	// Model stores the zero interface to the underlying Go struct.
+	Model interface{}
+}