gotip_test.go

Documentation: github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1

     1  package wasi_snapshot_preview1_test
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  	"os"
     7  	"os/exec"
     8  	"path"
     9  	"path/filepath"
    10  	"runtime"
    11  	"testing"
    12  	"time"
    13  )
    14  
    15  func TestMain(m *testing.M) {
    16  	// Find the gotip binary (if present), and compile the Wasm binary.
    17  	if gotipBin, err := findGotipBin(); err != nil {
    18  		println("gotip: skipping due missing binary:", err)
    19  	} else if wasmGotip, err = compileWasip1Wasm(gotipBin); err != nil {
    20  		println("gotip: skipping due compilation error:", err)
    21  	}
    22  	os.Exit(m.Run())
    23  }
    24  
    25  // compileWasip1Wasm allows us to generate a binary with runtime.GOOS=wasip1
    26  // and runtime.GOARCH=wasm. This intentionally does so on-demand, because the
    27  // wasm is too big to check in. Pls, not everyone will have gotip.
    28  func compileWasip1Wasm(gotipBin string) ([]byte, error) {
    29  	// Prepare the working directory.
    30  	workdir, err := os.MkdirTemp("", "wasi")
    31  	if err != nil {
    32  		return nil, err
    33  	}
    34  	defer os.RemoveAll(workdir)
    35  
    36  	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
    37  	defer cancel()
    38  
    39  	bin := path.Join(workdir, "wasi.wasm")
    40  	cmd := exec.CommandContext(ctx, gotipBin, "build", "-o", bin, ".") //nolint:gosec
    41  	cmd.Env = append(os.Environ(), "GOOS=wasip1", "GOARCH=wasm")
    42  	cmd.Dir = "testdata/gotip"
    43  	out, err := cmd.CombinedOutput()
    44  	if err != nil {
    45  		return nil, fmt.Errorf("couldn't compile %s: %w", string(out), err)
    46  	}
    47  
    48  	return os.ReadFile(bin) //nolint:gosec
    49  }
    50  
    51  func findGotipBin() (string, error) {
    52  	binName := "gotip"
    53  	if runtime.GOOS == "windows" {
    54  		binName += ".exe"
    55  	}
    56  	gotipBin := filepath.Join(runtime.GOROOT(), "bin", binName)
    57  	if _, err := os.Stat(gotipBin); err == nil {
    58  		return gotipBin, nil
    59  	}
    60  	// Now, search the path
    61  	return exec.LookPath(binName)
    62  }
    63
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