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421 lines
15 KiB
421 lines
15 KiB
4 years ago
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// +build ignore
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package gorules
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import "github.com/quasilyte/go-ruleguard/dsl/fluent"
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// This is a collection of rules for ruleguard: https://github.com/quasilyte/go-ruleguard
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// Remove extra conversions: mdempsky/unconvert
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func unconvert(m fluent.Matcher) {
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m.Match("int($x)").Where(m["x"].Type.Is("int") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("float32($x)").Where(m["x"].Type.Is("float32") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("float64($x)").Where(m["x"].Type.Is("float64") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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// m.Match("byte($x)").Where(m["x"].Type.Is("byte")).Report("unnecessary conversion").Suggest("$x")
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// m.Match("rune($x)").Where(m["x"].Type.Is("rune")).Report("unnecessary conversion").Suggest("$x")
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m.Match("bool($x)").Where(m["x"].Type.Is("bool") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("int8($x)").Where(m["x"].Type.Is("int8") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("int16($x)").Where(m["x"].Type.Is("int16") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("int32($x)").Where(m["x"].Type.Is("int32") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("int64($x)").Where(m["x"].Type.Is("int64") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("uint8($x)").Where(m["x"].Type.Is("uint8") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("uint16($x)").Where(m["x"].Type.Is("uint16") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("uint32($x)").Where(m["x"].Type.Is("uint32") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("uint64($x)").Where(m["x"].Type.Is("uint64") && !m["x"].Const).Report("unnecessary conversion").Suggest("$x")
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m.Match("time.Duration($x)").Where(m["x"].Type.Is("time.Duration") && !m["x"].Text.Matches("^[0-9]*$")).Report("unnecessary conversion").Suggest("$x")
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}
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// Don't use == or != with time.Time
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// https://github.com/dominikh/go-tools/issues/47 : Wontfix
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func timeeq(m fluent.Matcher) {
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m.Match("$t0 == $t1").Where(m["t0"].Type.Is("time.Time")).Report("using == with time.Time")
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m.Match("$t0 != $t1").Where(m["t0"].Type.Is("time.Time")).Report("using != with time.Time")
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}
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// Wrong err in error check
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func wrongerr(m fluent.Matcher) {
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m.Match("if $*_, $err0 := $*_; $err1 != nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("if $*_, $err0 := $*_; $err1 != nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("if $*_, $err0 = $*_; $err1 != nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("if $*_, $err0 = $*_; $err1 != nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("if $*_, $err0 := $*_; $err1 == nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("if $*_, $err0 := $*_; $err1 == nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("if $*_, $err0 = $*_; $err1 == nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("if $*_, $err0 = $*_; $err1 == nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 := $*_; if $err1 != nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 := $*_; if $err1 != nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 := $*_; if $err1 == nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 := $*_; if $err1 == nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 = $*_; if $err1 != nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 = $*_; if $err1 != nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 = $*_; if $err1 == nil { $*_ }").
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Where(m["err0"].Text == "err" && m["err0"].Type.Is("error") && m["err1"].Text != "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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m.Match("$*_, $err0 = $*_; if $err1 == nil { $*_ }").
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Where(m["err0"].Text != "err" && m["err0"].Type.Is("error") && m["err1"].Text == "err" && m["err1"].Type.Is("error")).
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Report("maybe wrong err in error check")
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}
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// err but no an error
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func errnoterror(m fluent.Matcher) {
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// Would be easier to check for all err identifiers instead, but then how do we get the type from m[] ?
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m.Match(
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"if $*_, err := $x; $err != nil { $*_ } else if $_ { $*_ }",
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"if $*_, err := $x; $err != nil { $*_ } else { $*_ }",
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"if $*_, err := $x; $err != nil { $*_ }",
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"if $*_, err = $x; $err != nil { $*_ } else if $_ { $*_ }",
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"if $*_, err = $x; $err != nil { $*_ } else { $*_ }",
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"if $*_, err = $x; $err != nil { $*_ }",
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"$*_, err := $x; if $err != nil { $*_ } else if $_ { $*_ }",
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"$*_, err := $x; if $err != nil { $*_ } else { $*_ }",
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"$*_, err := $x; if $err != nil { $*_ }",
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"$*_, err = $x; if $err != nil { $*_ } else if $_ { $*_ }",
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"$*_, err = $x; if $err != nil { $*_ } else { $*_ }",
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"$*_, err = $x; if $err != nil { $*_ }",
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).
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Where(m["err"].Text == "err" && !m["err"].Type.Is("error") && m["x"].Text != "recover()").
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Report("err variable not error type")
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}
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// Identical if and else bodies
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func ifbodythenbody(m fluent.Matcher) {
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m.Match("if $*_ { $body } else { $body }").
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Report("identical if and else bodies")
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// Lots of false positives.
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// m.Match("if $*_ { $body } else if $*_ { $body }").
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// Report("identical if and else bodies")
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}
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// Odd inequality: A - B < 0 instead of !=
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// Too many false positives.
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/*
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func subtractnoteq(m fluent.Matcher) {
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m.Match("$a - $b < 0").Report("consider $a != $b")
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m.Match("$a - $b > 0").Report("consider $a != $b")
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m.Match("0 < $a - $b").Report("consider $a != $b")
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m.Match("0 > $a - $b").Report("consider $a != $b")
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}
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*/
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// Self-assignment
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func selfassign(m fluent.Matcher) {
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m.Match("$x = $x").Report("useless self-assignment")
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}
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// Odd nested ifs
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func oddnestedif(m fluent.Matcher) {
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m.Match("if $x { if $x { $*_ }; $*_ }",
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"if $x == $y { if $x != $y {$*_ }; $*_ }",
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"if $x != $y { if $x == $y {$*_ }; $*_ }",
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"if $x { if !$x { $*_ }; $*_ }",
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"if !$x { if $x { $*_ }; $*_ }").
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Report("odd nested ifs")
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m.Match("for $x { if $x { $*_ }; $*_ }",
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"for $x == $y { if $x != $y {$*_ }; $*_ }",
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"for $x != $y { if $x == $y {$*_ }; $*_ }",
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"for $x { if !$x { $*_ }; $*_ }",
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"for !$x { if $x { $*_ }; $*_ }").
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Report("odd nested for/ifs")
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}
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// odd bitwise expressions
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func oddbitwise(m fluent.Matcher) {
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m.Match("$x | $x",
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"$x | ^$x",
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"^$x | $x").
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Report("odd bitwise OR")
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m.Match("$x & $x",
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"$x & ^$x",
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"^$x & $x").
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Report("odd bitwise AND")
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m.Match("$x &^ $x").
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Report("odd bitwise AND-NOT")
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}
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// odd sequence of if tests with return
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func ifreturn(m fluent.Matcher) {
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m.Match("if $x { return $*_ }; if $x {$*_ }").Report("odd sequence of if test")
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m.Match("if $x { return $*_ }; if !$x {$*_ }").Report("odd sequence of if test")
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m.Match("if !$x { return $*_ }; if $x {$*_ }").Report("odd sequence of if test")
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m.Match("if $x == $y { return $*_ }; if $x != $y {$*_ }").Report("odd sequence of if test")
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m.Match("if $x != $y { return $*_ }; if $x == $y {$*_ }").Report("odd sequence of if test")
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}
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func oddifsequence(m fluent.Matcher) {
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/*
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m.Match("if $x { $*_ }; if $x {$*_ }").Report("odd sequence of if test")
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m.Match("if $x == $y { $*_ }; if $y == $x {$*_ }").Report("odd sequence of if tests")
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m.Match("if $x != $y { $*_ }; if $y != $x {$*_ }").Report("odd sequence of if tests")
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m.Match("if $x < $y { $*_ }; if $y > $x {$*_ }").Report("odd sequence of if tests")
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m.Match("if $x <= $y { $*_ }; if $y >= $x {$*_ }").Report("odd sequence of if tests")
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m.Match("if $x > $y { $*_ }; if $y < $x {$*_ }").Report("odd sequence of if tests")
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m.Match("if $x >= $y { $*_ }; if $y <= $x {$*_ }").Report("odd sequence of if tests")
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*/
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}
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// odd sequence of nested if tests
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func nestedifsequence(m fluent.Matcher) {
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/*
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m.Match("if $x < $y { if $x >= $y {$*_ }; $*_ }").Report("odd sequence of nested if tests")
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m.Match("if $x <= $y { if $x > $y {$*_ }; $*_ }").Report("odd sequence of nested if tests")
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m.Match("if $x > $y { if $x <= $y {$*_ }; $*_ }").Report("odd sequence of nested if tests")
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m.Match("if $x >= $y { if $x < $y {$*_ }; $*_ }").Report("odd sequence of nested if tests")
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*/
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}
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// odd sequence of assignments
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func identicalassignments(m fluent.Matcher) {
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m.Match("$x = $y; $y = $x").Report("odd sequence of assignments")
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}
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func oddcompoundop(m fluent.Matcher) {
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m.Match("$x += $x + $_",
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"$x += $x - $_").
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Report("odd += expression")
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m.Match("$x -= $x + $_",
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"$x -= $x - $_").
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Report("odd -= expression")
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}
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func constswitch(m fluent.Matcher) {
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m.Match("switch $x { $*_ }", "switch $*_; $x { $*_ }").
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Where(m["x"].Const && !m["x"].Text.Matches(`^runtime\.`)).
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Report("constant switch")
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}
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func oddcomparisons(m fluent.Matcher) {
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m.Match(
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"$x - $y == 0",
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"$x - $y != 0",
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"$x - $y < 0",
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"$x - $y <= 0",
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"$x - $y > 0",
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"$x - $y >= 0",
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"$x ^ $y == 0",
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"$x ^ $y != 0",
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).Report("odd comparison")
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}
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func oddmathbits(m fluent.Matcher) {
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m.Match(
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"64 - bits.LeadingZeros64($x)",
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"32 - bits.LeadingZeros32($x)",
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"16 - bits.LeadingZeros16($x)",
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"8 - bits.LeadingZeros8($x)",
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).Report("odd math/bits expression: use bits.Len*() instead?")
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}
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func floateq(m fluent.Matcher) {
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m.Match(
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"$x == $y",
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"$x != $y",
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).
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Where(m["x"].Type.Is("float32") && !m["x"].Const && !m["y"].Text.Matches("0(.0+)?")).
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Report("floating point tested for equality")
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m.Match(
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"$x == $y",
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"$x != $y",
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).
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Where(m["x"].Type.Is("float64") && !m["x"].Const && !m["y"].Text.Matches("0(.0+)?")).
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Report("floating point tested for equality")
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|
m.Match("switch $x { $*_ }", "switch $*_; $x { $*_ }").
|
||
|
|
Where(m["x"].Type.Is("float32")).
|
||
|
|
Report("floating point as switch expression")
|
||
|
|
|
||
|
|
m.Match("switch $x { $*_ }", "switch $*_; $x { $*_ }").
|
||
|
|
Where(m["x"].Type.Is("float64")).
|
||
|
|
Report("floating point as switch expression")
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func badexponent(m fluent.Matcher) {
|
||
|
|
m.Match(
|
||
|
|
"2 ^ $x",
|
||
|
|
"10 ^ $x",
|
||
|
|
).
|
||
|
|
Report("caret (^) is not exponentiation")
|
||
|
|
}
|
||
|
|
|
||
|
|
func floatloop(m fluent.Matcher) {
|
||
|
|
m.Match(
|
||
|
|
"for $i := $x; $i < $y; $i += $z { $*_ }",
|
||
|
|
"for $i = $x; $i < $y; $i += $z { $*_ }",
|
||
|
|
).
|
||
|
|
Where(m["i"].Type.Is("float64")).
|
||
|
|
Report("floating point for loop counter")
|
||
|
|
|
||
|
|
m.Match(
|
||
|
|
"for $i := $x; $i < $y; $i += $z { $*_ }",
|
||
|
|
"for $i = $x; $i < $y; $i += $z { $*_ }",
|
||
|
|
).
|
||
|
|
Where(m["i"].Type.Is("float32")).
|
||
|
|
Report("floating point for loop counter")
|
||
|
|
}
|
||
|
|
|
||
|
|
func urlredacted(m fluent.Matcher) {
|
||
|
|
|
||
|
|
m.Match(
|
||
|
|
"log.Println($x, $*_)",
|
||
|
|
"log.Println($*_, $x, $*_)",
|
||
|
|
"log.Println($*_, $x)",
|
||
|
|
"log.Printf($*_, $x, $*_)",
|
||
|
|
"log.Printf($*_, $x)",
|
||
|
|
|
||
|
|
"log.Println($x, $*_)",
|
||
|
|
"log.Println($*_, $x, $*_)",
|
||
|
|
"log.Println($*_, $x)",
|
||
|
|
"log.Printf($*_, $x, $*_)",
|
||
|
|
"log.Printf($*_, $x)",
|
||
|
|
).
|
||
|
|
Where(m["x"].Type.Is("*url.URL")).
|
||
|
|
Report("consider $x.Redacted() when outputting URLs")
|
||
|
|
}
|
||
|
|
|
||
|
|
func sprinterr(m fluent.Matcher) {
|
||
|
|
m.Match(`fmt.Sprint($err)`,
|
||
|
|
`fmt.Sprintf("%s", $err)`,
|
||
|
|
`fmt.Sprintf("%v", $err)`,
|
||
|
|
).
|
||
|
|
Where(m["err"].Type.Is("error")).
|
||
|
|
Report("maybe call $err.Error() instead of fmt.Sprint()?")
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func largeloopcopy(m fluent.Matcher) {
|
||
|
|
m.Match(
|
||
|
|
`for $_, $v := range $_ { $*_ }`,
|
||
|
|
).
|
||
|
|
Where(m["v"].Type.Size > 512).
|
||
|
|
Report(`loop copies large value each iteration`)
|
||
|
|
}
|
||
|
|
|
||
|
|
func joinpath(m fluent.Matcher) {
|
||
|
|
m.Match(
|
||
|
|
`strings.Join($_, "/")`,
|
||
|
|
`strings.Join($_, "\\")`,
|
||
|
|
"strings.Join($_, `\\`)",
|
||
|
|
).
|
||
|
|
Report(`did you mean path.Join() or filepath.Join() ?`)
|
||
|
|
}
|
||
|
|
|
||
|
|
func readfull(m fluent.Matcher) {
|
||
|
|
m.Match(`$n, $err := io.ReadFull($_, $slice)
|
||
|
|
if $err != nil || $n != len($slice) {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
`$n, $err := io.ReadFull($_, $slice)
|
||
|
|
if $n != len($slice) || $err != nil {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
`$n, $err = io.ReadFull($_, $slice)
|
||
|
|
if $err != nil || $n != len($slice) {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
`$n, $err = io.ReadFull($_, $slice)
|
||
|
|
if $n != len($slice) || $err != nil {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
`if $n, $err := io.ReadFull($_, $slice); $n != len($slice) || $err != nil {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
`if $n, $err := io.ReadFull($_, $slice); $err != nil || $n != len($slice) {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
`if $n, $err = io.ReadFull($_, $slice); $n != len($slice) || $err != nil {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
`if $n, $err = io.ReadFull($_, $slice); $err != nil || $n != len($slice) {
|
||
|
|
$*_
|
||
|
|
}`,
|
||
|
|
).Report("io.ReadFull() returns err == nil iff n == len(slice)")
|
||
|
|
}
|
||
|
|
|
||
|
|
func nilerr(m fluent.Matcher) {
|
||
|
|
m.Match(
|
||
|
|
`if err == nil { return err }`,
|
||
|
|
`if err == nil { return $*_, err }`,
|
||
|
|
).
|
||
|
|
Report(`return nil error instead of nil value`)
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func mailaddress(m fluent.Matcher) {
|
||
|
|
m.Match(
|
||
|
|
"fmt.Sprintf(`\"%s\" <%s>`, $NAME, $EMAIL)",
|
||
|
|
"fmt.Sprintf(`\"%s\"<%s>`, $NAME, $EMAIL)",
|
||
|
|
"fmt.Sprintf(`%s <%s>`, $NAME, $EMAIL)",
|
||
|
|
"fmt.Sprintf(`%s<%s>`, $NAME, $EMAIL)",
|
||
|
|
`fmt.Sprintf("\"%s\"<%s>", $NAME, $EMAIL)`,
|
||
|
|
`fmt.Sprintf("\"%s\" <%s>", $NAME, $EMAIL)`,
|
||
|
|
`fmt.Sprintf("%s<%s>", $NAME, $EMAIL)`,
|
||
|
|
`fmt.Sprintf("%s <%s>", $NAME, $EMAIL)`,
|
||
|
|
).
|
||
|
|
Report("use net/mail Address.String() instead of fmt.Sprintf()").
|
||
|
|
Suggest("(&mail.Address{Name:$NAME, Address:$EMAIL}).String()")
|
||
|
|
|
||
|
|
}
|