/
writer_factory.go
136 lines (121 loc) · 2.87 KB
/
writer_factory.go
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package syslog
import (
"crypto/tls"
"fmt"
"net/url"
metrics "code.cloudfoundry.org/go-metric-registry"
"code.cloudfoundry.org/loggregator-agent-release/src/pkg/egress"
)
type metricClient interface {
NewCounter(name, helpText string, o ...metrics.MetricOption) metrics.Counter
}
type WriterFactoryError struct {
Message string
URL *url.URL
}
func NewWriterFactoryErrorf(u *url.URL, format string, a ...any) error {
return WriterFactoryError{
URL: u,
Message: fmt.Sprintf(format, a...),
}
}
func (e WriterFactoryError) anonymizedURL() *url.URL {
u := *e.URL
u.User = nil
u.RawQuery = ""
return &u
}
func (e WriterFactoryError) Error() string {
return fmt.Sprintf("%q: %s", e.anonymizedURL(), e.Message)
}
type WriterFactory struct {
internalTlsConfig *tls.Config
externalTlsConfig *tls.Config
netConf NetworkTimeoutConfig
m metricClient
}
func NewWriterFactory(internalTlsConfig *tls.Config, externalTlsConfig *tls.Config, netConf NetworkTimeoutConfig, m metricClient) WriterFactory {
return WriterFactory{
internalTlsConfig: internalTlsConfig,
externalTlsConfig: externalTlsConfig,
netConf: netConf,
m: m,
}
}
func (f WriterFactory) NewWriter(ub *URLBinding) (egress.WriteCloser, error) {
tlsCfg := f.externalTlsConfig.Clone()
if ub.InternalTls {
tlsCfg = f.internalTlsConfig.Clone()
}
if len(ub.Certificate) > 0 && len(ub.PrivateKey) > 0 {
cert, err := tls.X509KeyPair(ub.Certificate, ub.PrivateKey)
if err != nil {
err = NewWriterFactoryErrorf(ub.URL, "failed to load certificate: %s", err.Error())
return nil, err
}
tlsCfg.Certificates = []tls.Certificate{cert}
}
if len(ub.CA) > 0 {
ok := tlsCfg.RootCAs.AppendCertsFromPEM(ub.CA)
if !ok {
err := NewWriterFactoryErrorf(ub.URL, "failed to load root CA")
return nil, err
}
}
drainScope := "app"
if ub.AppID == "" {
drainScope = "aggregate"
}
anonymousURL := *ub.URL
anonymousURL.User = nil
anonymousURL.RawQuery = ""
egressMetric := f.m.NewCounter(
"egress",
"Total number of envelopes successfully egressed.",
metrics.WithMetricLabels(map[string]string{
"direction": "egress",
"drain_scope": drainScope,
"drain_url": anonymousURL.String(),
}),
)
var o []ConverterOption
if ub.OmitMetadata {
o = append(o, WithoutSyslogMetadata())
}
converter := NewConverter(o...)
var w egress.WriteCloser
switch ub.URL.Scheme {
case "https":
w = NewHTTPSWriter(
ub,
f.netConf,
tlsCfg,
egressMetric,
converter,
)
case "syslog":
w = NewTCPWriter(
ub,
f.netConf,
egressMetric,
converter,
)
case "syslog-tls":
w = NewTLSWriter(
ub,
f.netConf,
tlsCfg,
egressMetric,
converter,
)
}
if w == nil {
return nil, NewWriterFactoryErrorf(ub.URL, "unsupported protocol: %q", ub.URL.Scheme)
}
return NewRetryWriter(
ub,
ExponentialDuration,
maxRetries,
w,
)
}