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static_pool.go
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static_pool.go
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package agent
import (
"context"
"crypto/tls"
pool "github.com/fnproject/fn/api/runnerpool"
"github.com/sirupsen/logrus"
)
// manages a single set of runners ignoring lb groups
type staticRunnerPool struct {
generator pool.MTLSRunnerFactory
tlsConf *tls.Config // can be nil when running in insecure mode
runnerCN string
runners []pool.Runner
}
func DefaultStaticRunnerPool(runnerAddresses []string) pool.RunnerPool {
return NewStaticRunnerPool(runnerAddresses, nil, SecureGRPCRunnerFactory)
}
func NewStaticRunnerPool(runnerAddresses []string, tlsConf *tls.Config, runnerFactory pool.MTLSRunnerFactory) pool.RunnerPool {
logrus.WithField("runners", runnerAddresses).Info("Starting static runner pool")
var runners []pool.Runner
for _, addr := range runnerAddresses {
r, err := runnerFactory(addr, tlsConf)
if err != nil {
logrus.WithError(err).WithField("runner_addr", addr).Warn("Invalid runner")
continue
}
logrus.WithField("runner_addr", addr).Debug("Adding runner to pool")
runners = append(runners, r)
}
return &staticRunnerPool{
runners: runners,
tlsConf: tlsConf,
generator: runnerFactory,
}
}
func (rp *staticRunnerPool) Runners(ctx context.Context, call pool.RunnerCall) ([]pool.Runner, error) {
r := make([]pool.Runner, len(rp.runners))
copy(r, rp.runners)
return r, nil
}
func (rp *staticRunnerPool) Shutdown(ctx context.Context) error {
var retErr error
for _, r := range rp.runners {
err := r.Close(ctx)
if err != nil {
logrus.WithError(err).WithField("runner_addr", r.Address()).Error("Error closing runner")
// grab the first error only for now.
if retErr == nil {
retErr = err
}
}
}
return retErr
}