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/durationcheck

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Apache License
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build:
@GO111MODULE=on go build -ldflags '-s -w' -o durationcheck ./cmd/durationcheck/main.go
install:
@GO111MODULE=on go install -ldflags '-s -w' ./cmd/durationcheck

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[![CircleCI](https://circleci.com/gh/charithe/durationcheck.svg?style=svg)](https://circleci.com/gh/charithe/durationcheck)
Duration Check
===============
A Go linter to detect cases where two `time.Duration` values are being multiplied in possibly erroneous ways.
For example, consider the following (highly contrived) function:
```go
func waitFor(someDuration time.Duration) {
timeToWait := someDuration * time.Second
time.Sleep(timeToWait)
}
```
Although the above code would compile without any errors, its runtime behaviour would almost certainly be incorrect.
A caller would reasonably expect `waitFor(5 * time.Seconds)` to wait for ~5 seconds but they would actually end up
waiting for ~1,388,889 hours.
The above example is just for illustration purposes only. The problem is glaringly obvious in such a simple function
and even the greenest Gopher would discover the issue immediately. However, imagine a much more complicated function
with many more lines and it is not inconceivable that such logic errors could go unnoticed.
See the [test cases](testdata/src/a/a.go) for more examples of the types of errors detected by the linter.
Installation
-------------
Requires Go 1.11 or above.
```
go get -u github.com/charithe/durationcheck/cmd/durationcheck
```
Usage
-----
Invoke `durationcheck` with your package name
```
durationcheck ./...
# or
durationcheck github.com/you/yourproject/...
```

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package durationcheck
import (
"bytes"
"fmt"
"go/ast"
"go/format"
"go/token"
"go/types"
"log"
"os"
"golang.org/x/tools/go/analysis"
"golang.org/x/tools/go/analysis/passes/inspect"
"golang.org/x/tools/go/ast/inspector"
)
var Analyzer = &analysis.Analyzer{
Name: "durationcheck",
Doc: "check for two durations multiplied together",
Run: run,
Requires: []*analysis.Analyzer{inspect.Analyzer},
}
func run(pass *analysis.Pass) (interface{}, error) {
// if the package does not import time, it can be skipped from analysis
if !hasImport(pass.Pkg, "time") {
return nil, nil
}
inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
nodeTypes := []ast.Node{
(*ast.BinaryExpr)(nil),
}
inspect.Preorder(nodeTypes, check(pass))
return nil, nil
}
func hasImport(pkg *types.Package, importPath string) bool {
for _, imp := range pkg.Imports() {
if imp.Path() == importPath {
return true
}
}
return false
}
// check contains the logic for checking that time.Duration is used correctly in the code being analysed
func check(pass *analysis.Pass) func(ast.Node) {
return func(node ast.Node) {
expr := node.(*ast.BinaryExpr)
// we are only interested in multiplication
if expr.Op != token.MUL {
return
}
// get the types of the two operands
x, xOK := pass.TypesInfo.Types[expr.X]
y, yOK := pass.TypesInfo.Types[expr.Y]
if !xOK || !yOK {
return
}
if isDuration(x.Type) && isDuration(y.Type) {
// check that both sides are acceptable expressions
if isUnacceptableExpr(pass, expr.X) && isUnacceptableExpr(pass, expr.Y) {
pass.Reportf(expr.Pos(), "Multiplication of durations: `%s`", formatNode(expr))
}
}
}
}
func isDuration(x types.Type) bool {
return x.String() == "time.Duration" || x.String() == "*time.Duration"
}
// isUnacceptableExpr returns true if the argument is not an acceptable time.Duration expression
func isUnacceptableExpr(pass *analysis.Pass, expr ast.Expr) bool {
switch e := expr.(type) {
case *ast.BasicLit:
return false
case *ast.Ident:
return !isAcceptableNestedExpr(pass, e)
case *ast.CallExpr:
return !isAcceptableCast(pass, e)
case *ast.BinaryExpr:
return !isAcceptableNestedExpr(pass, e)
case *ast.UnaryExpr:
return !isAcceptableNestedExpr(pass, e)
case *ast.SelectorExpr:
return !isAcceptableNestedExpr(pass, e)
case *ast.StarExpr:
return !isAcceptableNestedExpr(pass, e)
case *ast.ParenExpr:
return !isAcceptableNestedExpr(pass, e)
case *ast.IndexExpr:
return !isAcceptableNestedExpr(pass, e)
default:
return true
}
}
// isAcceptableCast returns true if the argument is an acceptable expression cast to time.Duration
func isAcceptableCast(pass *analysis.Pass, e *ast.CallExpr) bool {
// check that there's a single argument
if len(e.Args) != 1 {
return false
}
// check that the argument is acceptable
if !isAcceptableNestedExpr(pass, e.Args[0]) {
return false
}
// check for time.Duration cast
selector, ok := e.Fun.(*ast.SelectorExpr)
if !ok {
return false
}
return isDurationCast(selector)
}
func isDurationCast(selector *ast.SelectorExpr) bool {
pkg, ok := selector.X.(*ast.Ident)
if !ok {
return false
}
if pkg.Name != "time" {
return false
}
return selector.Sel.Name == "Duration"
}
func isAcceptableNestedExpr(pass *analysis.Pass, n ast.Expr) bool {
switch e := n.(type) {
case *ast.BasicLit:
return true
case *ast.BinaryExpr:
return isAcceptableNestedExpr(pass, e.X) && isAcceptableNestedExpr(pass, e.Y)
case *ast.UnaryExpr:
return isAcceptableNestedExpr(pass, e.X)
case *ast.Ident:
return isAcceptableIdent(pass, e)
case *ast.CallExpr:
t := pass.TypesInfo.TypeOf(e)
return !isDuration(t)
case *ast.SelectorExpr:
return isAcceptableNestedExpr(pass, e.X) && isAcceptableIdent(pass, e.Sel)
case *ast.StarExpr:
return isAcceptableNestedExpr(pass, e.X)
case *ast.ParenExpr:
return isAcceptableNestedExpr(pass, e.X)
case *ast.IndexExpr:
t := pass.TypesInfo.TypeOf(e)
return !isDuration(t)
default:
return false
}
}
func isAcceptableIdent(pass *analysis.Pass, ident *ast.Ident) bool {
obj := pass.TypesInfo.ObjectOf(ident)
return !isDuration(obj.Type())
}
func formatNode(node ast.Node) string {
buf := new(bytes.Buffer)
if err := format.Node(buf, token.NewFileSet(), node); err != nil {
log.Printf("Error formatting expression: %v", err)
return ""
}
return buf.String()
}
func printAST(msg string, node ast.Node) {
fmt.Printf(">>> %s:\n%s\n\n\n", msg, formatNode(node))
ast.Fprint(os.Stdout, nil, node, nil)
fmt.Println("--------------")
}

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module github.com/charithe/durationcheck
go 1.14
require golang.org/x/tools v0.1.0

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github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 h1:myAQVi0cGEoqQVR5POX+8RR2mrocKqNN1hmeMqhX27k=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=