coder · Emyrk · Dec 15, 2023 · Dec 14, 2023 · Dec 14, 2023 · Dec 14, 2023
diff --git a/coderd/database/gentest/modelqueries_test.go b/coderd/database/gentest/modelqueries_test.go
@@ -0,0 +1,182 @@
+package gentest_test
+
+import (
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/exp/slices"
+)
+
+// TestCustomQueriesSynced makes sure the manual custom queries in modelqueries.go
+// are synced with the autogenerated queries.sql.go. This should probably be
+// autogenerated, but it's not atm and this is easy to throw in to elevate a better
+// error message.
+//
+// If this breaks, and is hard to fix, you can t.Skip() it. It is not a critical
+// test. Ping @Emyrk to fix it again.
+func TestCustomQueriesSyncedRowScan(t *testing.T) {
+	t.Parallel()
+
+	funcsToTrack := map[string]string{
+		"GetTemplatesWithFilter": "GetAuthorizedTemplates",
+		"GetWorkspaces":          "GetAuthorizedWorkspaces",
+		"GetUsers":               "GetAuthorizedUsers",
+	}
+
+	// Scan custom
+	var custom []string
+	for _, fn := range funcsToTrack {
+		custom = append(custom, fn)
+	}
+
+	customFns := parseFile(t, "../modelqueries.go", func(name string) bool {
+		return slices.Contains(custom, name)
+	})
+	generatedFns := parseFile(t, "../queries.sql.go", func(name string) bool {
+		_, ok := funcsToTrack[name]
+		return ok
+	})
+	merged := customFns
+	for k, v := range generatedFns {
+		merged[k] = v
+	}
+
+	for a, b := range funcsToTrack {
+		a, b := a, b
+		if !compareFns(t, a, b, merged[a], merged[b]) {
+			//nolint:revive
+			defer func() {
+				// Run this at the end so the suggested fix is the last thing printed.
+				t.Errorf("The functions %q and %q need to have identical 'rows.Scan()' "+
+					"and 'db.QueryContext()' arguments in their function bodies. "+
+					"Make sure to copy the function body from the autogenerated %q body. "+
+					"Specifically the parameters for 'rows.Scan()' and 'db.QueryContext()'.", a, b, a)
+			}()
+		}
+	}
+}
+
+type parsedFunc struct {
+	RowScanArgs []ast.Expr
+	QueryArgs   []ast.Expr
+}
+
+func parseFile(t *testing.T, filename string, trackFunc func(name string) bool) map[string]*parsedFunc {
+	fset := token.NewFileSet()
+	f, err := parser.ParseFile(fset, filename, nil, parser.SkipObjectResolution)
+	require.NoErrorf(t, err, "failed to parse file %q", filename)
+
+	parsed := make(map[string]*parsedFunc)
+	for _, decl := range f.Decls {
+		if fn, ok := decl.(*ast.FuncDecl); ok {
+			if trackFunc(fn.Name.Name) {
+				parsed[fn.Name.String()] = &parsedFunc{
+					RowScanArgs: pullRowScanArgs(fn),
+					QueryArgs:   pullQueryArgs(fn),
+				}
+			}
+		}
+	}
+
+	return parsed
+}
+
+func compareFns(t *testing.T, aName, bName string, a, b *parsedFunc) bool {
+	if a == nil {
+		t.Errorf("The function %q is missing", aName)
+		return false
+	}
+	if b == nil {
+		t.Errorf("The function %q is missing", bName)
+		return false
+	}
+	r := compareArgs(t, "rows.Scan() arguments", aName, bName, a.RowScanArgs, b.RowScanArgs)
+	if len(a.QueryArgs) > 2 && len(b.QueryArgs) > 2 {
+		// This is because the actual query param name is different. One uses the
+		// const, the other uses a variable that is a mutation of the original query.
+		a.QueryArgs[1] = b.QueryArgs[1]
+	}
+	q := compareArgs(t, "db.QueryContext() arguments", aName, bName, a.QueryArgs, b.QueryArgs)
+	return r && q
+}
+
+func compareArgs(t *testing.T, argType string, aName, bName string, a, b []ast.Expr) bool {
+	return assert.Equal(t, argList(t, a), argList(t, b), "mismatched %s for %s and %s", argType, aName, bName)
+}
+
+func argList(t *testing.T, args []ast.Expr) []string {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("Recovered in f reading arg names: %s", r)
+		}
+	}()
+
+	var argNames []string
+	for _, arg := range args {
+		argname := "unknown"
+		// This is "&i.Arg" style stuff
+		if unary, ok := arg.(*ast.UnaryExpr); ok {
+			argname = unary.X.(*ast.SelectorExpr).Sel.Name
+		}
+		if ident, ok := arg.(*ast.Ident); ok {
+			argname = ident.Name
+		}
+		if sel, ok := arg.(*ast.SelectorExpr); ok {
+			argname = sel.Sel.Name
+		}
+		if call, ok := arg.(*ast.CallExpr); ok {
+			// Eh, this is pg.Array style stuff. Do a best effort.
+			argname = fmt.Sprintf("call(%d)", len(call.Args))
+			if fnCall, ok := call.Fun.(*ast.SelectorExpr); ok {
+				argname = fmt.Sprintf("%s(%d)", fnCall.Sel.Name, len(call.Args))
+			}
+		}
+
+		if argname == "unknown" {
+			t.Errorf("Unknown arg, cannot parse: %T", arg)
+		}
+		argNames = append(argNames, argname)
+	}
+	return argNames
+}
+
+func pullQueryArgs(fn *ast.FuncDecl) []ast.Expr {
+	for _, exp := range fn.Body.List {
+		// find "rows, err :="
+		if assign, ok := exp.(*ast.AssignStmt); ok {
+			if len(assign.Lhs) == 2 {
+				if id, ok := assign.Lhs[0].(*ast.Ident); ok && id.Name == "rows" {
+					// This is rows, err :=
+					query := assign.Rhs[0].(*ast.CallExpr)
+					if qSel, ok := query.Fun.(*ast.SelectorExpr); ok && qSel.Sel.Name == "QueryContext" {
+						return query.Args
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func pullRowScanArgs(fn *ast.FuncDecl) []ast.Expr {
+	for _, exp := range fn.Body.List {
+		if forStmt, ok := exp.(*ast.ForStmt); ok {
+			// This came from the debugger window and tracking it down.
+			rowScan := (forStmt.Body.
+				// Second statement in the for loop is the if statement
+				// with rows.can
+				List[1].(*ast.IfStmt).
+				// This is the err := rows.Scan()
+				Init.(*ast.AssignStmt).
+				// Rhs is the row.Scan part
+				Rhs)[0].(*ast.CallExpr)
+			return rowScan.Args
+		}
+	}
+	return nil
+}