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dispatchrun / net

Go package implementing WASI socket extensions
Apache License 2.0
137 stars 7 forks source link

wasip1: make pure Go resolver the default #16

Closed chriso closed 1 year ago

chriso commented 1 year ago

Now that https://go-review.googlesource.com/c/go/+/500579 has landed, we can enable the pure Go resolver as the default name resolution mechanism. This means that the standard library net package works as expected. It also means that name resolution is non-blocking.

Example

package main

import (
    "fmt"
    "net"

    _ "github.com/stealthrocket/net/wasip1"
)

func main() {
    ips, err := net.LookupIP("example.com")
    if err != nil {
        panic(err)
    }
    fmt.Printf("%v\n", ips)
}
$ GOOS=wasip1 GOARCH=wasm gotip build -o main.wasm main.go
$ wasirun --dir / main.wasm
[93.184.216.34 2606:2800:220:1:248:1893:25c8:1946]
Trace of system calls: ``` $ wasirun --dir / --trace main.wasm RandomGet([32]byte) => [32]byte("&S\x16k\2\xfe\x9f\xb4\x8fD-y]^\xd2\x83\xf9\4V@@\1+\xca\x0bfxP=7-\6") RandomGet([8]byte) => [8]byte("\x1a]i\xb9'\xfd\x11\xdd") ClockTimeGet(1, 0) => 229647185 ArgsSizesGet() => 1, 10 ArgsGet() => ["main.wasm"] EnvironSizesGet() => 0, 0 ClockTimeGet(1, 0) => 234908567 ClockTimeGet(1, 0) => 234917926 ClockTimeGet(1, 0) => 235012813 FDStatGet(0) => {FileType:CharacterDeviceType,RightsBase:TTYRights} FDStatSetFlags(0, NonBlock) => ok FDStatGet(1) => {FileType:CharacterDeviceType,RightsBase:TTYRights} FDStatSetFlags(1, NonBlock) => ok FDStatGet(2) => {FileType:CharacterDeviceType,RightsBase:TTYRights} FDStatSetFlags(2, NonBlock) => ok FDPreStatGet(3) => {Type:PreOpenDir,PreStatDir.NameLength:1} FDPreStatDirName(3) => "/" FDPreStatGet(4) => EBADF (Bad file number) ClockTimeGet(1, 0) => 235734439 FDStatGet(0) => {FileType:CharacterDeviceType,Flags:NonBlock,RightsBase:TTYRights} FDStatGet(1) => {FileType:CharacterDeviceType,Flags:NonBlock,RightsBase:TTYRights} FDStatGet(2) => {FileType:CharacterDeviceType,Flags:NonBlock,RightsBase:TTYRights} PathOpen(3, SymlinkFollow, "etc/resolv.conf", OpenFlags(0), FDReadRight|FDSeekRight|FDStatSetFlagsRight|FDSyncRight|FDTellRight|FDAdviseRight|PathCreateDirectoryRight|PathCreateFileRight|PathLinkSourceRight|PathLinkTargetRight|PathOpenRight|FDReadDirRight|PathReadLinkRight|PathRenameSourceRight|PathRenameTargetRight|PathFileStatGetRight|PathFileStatSetTimesRight|FDFileStatGetRight|FDFileStatSetSizeRight|FDFileStatSetTimesRight|PathSymlinkRight|PathRemoveDirectoryRight|PathUnlinkFileRight|PollFDReadWriteRight, DirectoryRights|FileRights, FDFlags(0)) => 4 FDStatGet(4) => {FileType:RegularFileType,RightsBase:FDReadRight|FDSeekRight|FDStatSetFlagsRight|FDSyncRight|FDTellRight|FDAdviseRight|PathCreateDirectoryRight|PathCreateFileRight|PathLinkSourceRight|PathLinkTargetRight|PathOpenRight|FDReadDirRight|PathReadLinkRight|PathRenameSourceRight|PathRenameTargetRight|PathFileStatGetRight|PathFileStatSetTimesRight|FDFileStatGetRight|FDFileStatSetSizeRight|FDFileStatSetTimesRight|PathSymlinkRight|PathRemoveDirectoryRight|PathUnlinkFileRight|PollFDReadWriteRight,RightsInheriting:DirectoryRights|FileRights} FDStatSetFlags(4, NonBlock) => ok FDFileStatGet(4) => wasi.FileStat{Device:0x18, INode:0x6c5, FileType:0x4, NLink:0x1, Size:0x398, AccessTime:0x176d535dc14815a7, ModifyTime:0x176d535dc016e8a7, ChangeTime:0x176d535dc016e8a7} FDRead(4, [1]IOVec{[65536]Byte}) => [920]byte: [1]IOVec{[920]byte("# This is /run/systemd/resolve/s"...)} FDRead(4, [1]IOVec{[64616]Byte}) => [0]byte: [1]IOVec{[64616]Byte} FDRead(4, [1]IOVec{[65536]Byte}) => [0]byte: [1]IOVec{[65536]Byte} FDClose(4) => ok ClockTimeGet(0, 0) => 1688098909735646708 ClockTimeGet(1, 0) => 236509003 ClockTimeGet(0, 0) => 1688098909735658788 ClockTimeGet(1, 0) => 236520943 PathOpen(3, SymlinkFollow, "etc/nsswitch.conf", OpenFlags(0), FDReadRight|FDSeekRight|FDStatSetFlagsRight|FDSyncRight|FDTellRight|FDAdviseRight|PathCreateDirectoryRight|PathCreateFileRight|PathLinkSourceRight|PathLinkTargetRight|PathOpenRight|FDReadDirRight|PathReadLinkRight|PathRenameSourceRight|PathRenameTargetRight|PathFileStatGetRight|PathFileStatSetTimesRight|FDFileStatGetRight|FDFileStatSetSizeRight|FDFileStatSetTimesRight|PathSymlinkRight|PathRemoveDirectoryRight|PathUnlinkFileRight|PollFDReadWriteRight, DirectoryRights|FileRights, FDFlags(0)) => 4 FDStatGet(4) => {FileType:RegularFileType,RightsBase:FDReadRight|FDSeekRight|FDStatSetFlagsRight|FDSyncRight|FDTellRight|FDAdviseRight|PathCreateDirectoryRight|PathCreateFileRight|PathLinkSourceRight|PathLinkTargetRight|PathOpenRight|FDReadDirRight|PathReadLinkRight|PathRenameSourceRight|PathRenameTargetRight|PathFileStatGetRight|PathFileStatSetTimesRight|FDFileStatGetRight|FDFileStatSetSizeRight|FDFileStatSetTimesRight|PathSymlinkRight|PathRemoveDirectoryRight|PathUnlinkFileRight|PollFDReadWriteRight,RightsInheriting:DirectoryRights|FileRights} FDStatSetFlags(4, NonBlock) => ok FDFileStatGet(4) => wasi.FileStat{Device:0x10302, INode:0x12001a7, FileType:0x4, NLink:0x1, Size:0x252, AccessTime:0x176d5d03511e14fb, ModifyTime:0x175721b929caea00, ChangeTime:0x1768ccf40e47902c} FDRead(4, [1]IOVec{[65536]Byte}) => [594]byte: [1]IOVec{[594]byte("# /etc/nsswitch.conf\n#\n# Example"...)} FDRead(4, [1]IOVec{[64942]Byte}) => [0]byte: [1]IOVec{[64942]Byte} FDRead(4, [1]IOVec{[65536]Byte}) => [0]byte: [1]IOVec{[65536]Byte} FDClose(4) => ok ClockTimeGet(0, 0) => 1688098909735945428 ClockTimeGet(1, 0) => 236807853 ClockTimeGet(0, 0) => 1688098909735956658 ClockTimeGet(1, 0) => 236818433 ClockTimeGet(0, 0) => 1688098909735978807 ClockTimeGet(1, 0) => 236840602 PathFileStatGet(3, SymlinkFollow, "etc/hosts") => wasi.FileStat{Device:0x10302, INode:0x1200187, FileType:0x4, NLink:0x1, Size:0xdc, AccessTime:0x176d5d03bb73c309, ModifyTime:0x1768cd088ae81a9d, ChangeTime:0x1768cd088ae81a9d} PathOpen(3, SymlinkFollow, "etc/hosts", OpenFlags(0), FDReadRight|FDSeekRight|FDStatSetFlagsRight|FDSyncRight|FDTellRight|FDAdviseRight|PathCreateDirectoryRight|PathCreateFileRight|PathLinkSourceRight|PathLinkTargetRight|PathOpenRight|FDReadDirRight|PathReadLinkRight|PathRenameSourceRight|PathRenameTargetRight|PathFileStatGetRight|PathFileStatSetTimesRight|FDFileStatGetRight|FDFileStatSetSizeRight|FDFileStatSetTimesRight|PathSymlinkRight|PathRemoveDirectoryRight|PathUnlinkFileRight|PollFDReadWriteRight, DirectoryRights|FileRights, FDFlags(0)) => 4 FDStatGet(4) => {FileType:RegularFileType,RightsBase:FDReadRight|FDSeekRight|FDStatSetFlagsRight|FDSyncRight|FDTellRight|FDAdviseRight|PathCreateDirectoryRight|PathCreateFileRight|PathLinkSourceRight|PathLinkTargetRight|PathOpenRight|FDReadDirRight|PathReadLinkRight|PathRenameSourceRight|PathRenameTargetRight|PathFileStatGetRight|PathFileStatSetTimesRight|FDFileStatGetRight|FDFileStatSetSizeRight|FDFileStatSetTimesRight|PathSymlinkRight|PathRemoveDirectoryRight|PathUnlinkFileRight|PollFDReadWriteRight,RightsInheriting:DirectoryRights|FileRights} FDStatSetFlags(4, NonBlock) => ok FDRead(4, [1]IOVec{[65536]Byte}) => [220]byte: [1]IOVec{[220]byte("127.0.0.1 localhost\n127.0.1.1 be"...)} FDRead(4, [1]IOVec{[65316]Byte}) => [0]byte: [1]IOVec{[65316]Byte} FDRead(4, [1]IOVec{[65536]Byte}) => [0]byte: [1]IOVec{[65536]Byte} FDClose(4) => ok ClockTimeGet(0, 0) => 1688098909736393933 ClockTimeGet(1, 0) => 237257858 ClockTimeGet(1, 0) => 237288757 ClockTimeGet(1, 0) => 237296097 SockOpen(InetFamily, DatagramSocket, IPProtocol, SockConnectionRights|SockListenRights, SockConnectionRights) => 4 FDStatGet(4) => {FileType:SocketDGramType,RightsBase:SockConnectionRights|SockListenRights,RightsInheriting:SockConnectionRights} FDStatSetFlags(4, NonBlock) => ok SockSetOpt(4, SocketLevel, Broadcast, 1) => ok SockConnect(4, 127.0.0.53:53) => 127.0.0.1:47025 SockLocalAddress(4) => 127.0.0.1:47025 SockRemoteAddress(4) => 127.0.0.53:53 FDStatGet(4) => {FileType:SocketDGramType,Flags:NonBlock,RightsBase:SockConnectionRights|SockListenRights,RightsInheriting:SockConnectionRights} ClockTimeGet(1, 0) => 237475811 ClockTimeGet(1, 0) => 237482680 FDWrite(4, [1]IOVec{[40]byte("\xd0\xa5\1 \0\1\0\0\0\0\0\1\7example\3com\0\0\x1c\0\1\0\0)"...)}) => 40 SockRecvFrom(4, [1]IOVec{[1232]Byte}, RIFlags(0)) => EAGAIN (Try again) ClockTimeGet(1, 0) => 237677224 ClockTimeGet(1, 0) => 237688013 ClockTimeGet(0, 0) => 1688098909736879897 ClockTimeGet(1, 0) => 237742782 ClockTimeGet(1, 0) => 237754531 ClockTimeGet(1, 0) => 237758531 SockOpen(InetFamily, DatagramSocket, IPProtocol, SockConnectionRights|SockListenRights, SockConnectionRights) => 5 FDStatGet(5) => {FileType:SocketDGramType,RightsBase:SockConnectionRights|SockListenRights,RightsInheriting:SockConnectionRights} FDStatSetFlags(5, NonBlock) => ok SockSetOpt(5, SocketLevel, Broadcast, 1) => ok SockConnect(5, 127.0.0.53:53) => 127.0.0.1:34778 SockLocalAddress(5) => 127.0.0.1:34778 SockRemoteAddress(5) => 127.0.0.53:53 FDStatGet(5) => {FileType:SocketDGramType,Flags:NonBlock,RightsBase:SockConnectionRights|SockListenRights,RightsInheriting:SockConnectionRights} ClockTimeGet(1, 0) => 237847318 ClockTimeGet(1, 0) => 237852028 FDWrite(5, [1]IOVec{[40]byte("\xcd\xbc\1 \0\1\0\0\0\0\0\1\7example\3com\0\0\1\0\1\0\0)"...)}) => 40 SockRecvFrom(5, [1]IOVec{[1232]Byte}, RIFlags(0)) => EAGAIN (Try again) ClockTimeGet(1, 0) => 237938045 PollOneoff({EventType:ClockEvent,UserData:0x0,ID:Monotonic,Timeout:0,Precision:1000},{EventType:FDReadEvent,UserData:0x1340ba8,FD:4},{EventType:FDReadEvent,UserData:0x1340ab0,FD:5}) => {EventType:ClockEvent,UserData:0x0 PollOneoff({EventType:ClockEvent,UserData:0x0,ID:Monotonic,Timeout:4999326682,Precision:1000},{EventType:FDReadEvent,UserData:0x1340ba8,FD:4},{EventType:FDReadEvent,UserData:0x1340ab0,FD:5}) => {EventType:FDReadEvent,UserData:0x1340ba8,NBytes:0} ClockTimeGet(1, 0) => 238049691 ClockTimeGet(1, 0) => 238058061 ClockTimeGet(1, 0) => 238061511 SockRecvFrom(4, [1]IOVec{[1232]Byte}, RIFlags(0)) => [68]byte: [1]IOVec{[68]byte("\xd0\xa5\x81\x80\0\1\0\1\0\0\0\1\7example\3com\0\0\x1c\0\1\xc0\x0c\0"...)}, ROFlags(0), 127.0.0.53:53 FDClose(4) => ok ClockTimeGet(1, 0) => 238217926 ClockTimeGet(1, 0) => 238242145 PollOneoff({EventType:ClockEvent,UserData:0x0,ID:Monotonic,Timeout:0,Precision:1000},{EventType:FDReadEvent,UserData:0x1340ab0,FD:5}) => {EventType:ClockEvent,UserData:0x0,{EventType:FDReadEvent,UserData:0x1340ab0,NBytes:0} SockRecvFrom(5, [1]IOVec{[1232]Byte}, RIFlags(0)) => [56]byte: [1]IOVec{[56]byte("\xcd\xbc\x81\x80\0\1\0\1\0\0\0\1\7example\3com\0\0\1\0\1\xc0\x0c\0"...)}, ROFlags(0), 127.0.0.53:53 FDClose(5) => ok ClockTimeGet(1, 0) => 238354861 ClockTimeGet(1, 0) => 238364861 ClockTimeGet(1, 0) => 238371970 FDWrite(1, [1]IOVec{[51]byte("[2606:2800:220:1:248:1893:25c8:1"...)}) => [2606:2800:220:1:248:1893:25c8:1946 93.184.216.34] 51 ProcExit(0) => Close() => ok ```