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healthcheck.go
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healthcheck.go
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package core
import (
"context"
"fmt"
"strings"
"syscall"
"github.com/moby/buildkit/client/llb"
bkgw "github.com/moby/buildkit/frontend/gateway/client"
"github.com/moby/buildkit/solver/pb"
"github.com/dagger/dagger/engine/buildkit"
"github.com/dagger/dagger/telemetry"
)
type portHealthChecker struct {
bk *buildkit.Client
host string
ports []Port
}
func newHealth(bk *buildkit.Client, host string, ports []Port) *portHealthChecker {
return &portHealthChecker{
bk: bk,
host: host,
ports: ports,
}
}
func (d *portHealthChecker) Check(ctx context.Context) (rerr error) {
args := []string{"check", d.host}
allPortsSkipped := true
for _, port := range d.ports {
if !port.ExperimentalSkipHealthcheck {
args = append(args, fmt.Sprintf("%d/%s", port.Port, port.Protocol.Network()))
allPortsSkipped = false
}
}
if allPortsSkipped {
return nil
}
// always show health checks
ctx, span := Tracer().Start(ctx, strings.Join(args, " "))
defer telemetry.End(span, func() error { return rerr })
ctx, stdout, stderr := telemetry.WithStdioToOtel(ctx, InstrumentationLibrary)
scratchDef, err := llb.Scratch().Marshal(ctx)
if err != nil {
return err
}
scratchRes, err := d.bk.Solve(ctx, bkgw.SolveRequest{
Definition: scratchDef.ToPB(),
})
if err != nil {
return err
}
container, err := d.bk.NewContainer(ctx, bkgw.NewContainerRequest{
Mounts: []bkgw.Mount{
{
Dest: "/",
MountType: pb.MountType_BIND,
Ref: scratchRes.Ref,
},
},
})
if err != nil {
return err
}
// NB: use a different ctx than the one that'll be interrupted for anything
// that needs to run as part of post-interruption cleanup
cleanupCtx := context.WithoutCancel(ctx)
defer container.Release(cleanupCtx)
proc, err := container.Start(ctx, bkgw.StartRequest{
Args: args,
Env: append(telemetry.PropagationEnv(ctx), "_DAGGER_INTERNAL_COMMAND="),
Stdout: nopCloser{stdout},
Stderr: nopCloser{stderr},
})
if err != nil {
return err
}
exited := make(chan error, 1)
go func() {
exited <- proc.Wait()
}()
select {
case err := <-exited:
if err != nil {
return err
}
return nil
case <-ctx.Done():
err := proc.Signal(cleanupCtx, syscall.SIGKILL)
if err != nil {
return fmt.Errorf("interrupt check: %w", err)
}
<-exited
return ctx.Err()
}
}