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Merge pull request #51 from fako1024/50-source-initialization-require…
…s-expensive-lookup-for-network-interfaces [feature] Remove expensive net.Interface lookups upon link initialization
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| package link | ||
|
|
||
| // Interface is the low-level representation of a network interface | ||
| type Interface struct { | ||
| Name string | ||
| Index int | ||
| Type Type | ||
| } | ||
|
|
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| // NewInterface instantiates a new network interface and obtains its basic parameters | ||
| func NewInterface(name string) (iface Interface, err error) { | ||
| iface = Interface{ | ||
| Name: name, | ||
| } | ||
|
|
||
| if iface.Index, err = getIndex(name); err != nil { | ||
| return | ||
| } | ||
| if iface.Type, err = getLinkType(name); err != nil { | ||
| return | ||
| } | ||
|
|
||
| return | ||
| } | ||
|
|
||
| // String returns the name of the network interface (Stringer interface) | ||
| func (i Interface) String() string { | ||
| return i.Name | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| //go:build linux | ||
| // +build linux | ||
|
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| package link | ||
|
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| import ( | ||
| "errors" | ||
| "fmt" | ||
| "math" | ||
| "os" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
| "syscall" | ||
| ) | ||
|
|
||
| const ( | ||
| netBasePath = "/sys/class/net/" | ||
| netIndexPath = "/ifindex" | ||
| netTypePath = "/type" | ||
| netFlagsPath = "/flags" | ||
| ) | ||
|
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| // ErrIndexOutOfBounds denotes the (unlikely) case of an invalid index being outside the range of an int | ||
| var ErrIndexOutOfBounds = errors.New("interface index out of bounds") | ||
|
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| // Interfaces returns all host interfaces | ||
| func Interfaces() ([]Interface, error) { | ||
|
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| linkDir, err := os.OpenFile(netBasePath, os.O_RDONLY, 0600) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| ifaceNames, err := linkDir.Readdirnames(-1) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| ifaces := make([]Interface, len(ifaceNames)) | ||
| for i, ifaceName := range ifaceNames { | ||
| if ifaces[i], err = NewInterface(ifaceName); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
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| return ifaces, nil | ||
| } | ||
|
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| // IsUp determines if an interface is currently up (at the time of the call) | ||
| func (i Interface) IsUp() (bool, error) { | ||
|
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| data, err := os.ReadFile(filepath.Clean(netBasePath + i.Name + netFlagsPath)) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
|
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| flags, err := strconv.ParseInt( | ||
| strings.TrimSpace(string(data)), 0, 64) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
|
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| return flags&syscall.IFF_UP != 0, nil | ||
| } | ||
|
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| //////////////////////////////////////////////////////////////////////////////// | ||
|
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| func getIndex(name string) (int, error) { | ||
|
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| data, err := os.ReadFile(filepath.Clean(netBasePath + name + netIndexPath)) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
|
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| index, err := strconv.ParseInt( | ||
| strings.TrimSpace(string(data)), 0, 64) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
|
|
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| // Validate integer upper / lower bounds | ||
| if index > 0 && index <= math.MaxInt { | ||
| return int(index), nil | ||
| } | ||
|
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| return -1, ErrIndexOutOfBounds | ||
| } | ||
|
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| func getLinkType(name string) (Type, error) { | ||
|
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| sysPath := netBasePath + name + netTypePath | ||
| data, err := os.ReadFile(filepath.Clean(sysPath)) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
|
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| val, err := strconv.Atoi( | ||
| strings.TrimSpace(string(data))) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
|
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| if val < 0 || val > 65535 { | ||
| return -1, fmt.Errorf("invalid link type read from `%s`: %d", sysPath, val) | ||
| } | ||
|
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| return Type(val), nil | ||
| } |
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