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envoy.go
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envoy.go
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// Package envoy creates and configures an envoy server.
package envoy
import (
"bufio"
"bytes"
"context"
"errors"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"regexp"
"strconv"
"strings"
envoy_config_bootstrap_v3 "github.com/envoyproxy/go-control-plane/envoy/config/bootstrap/v3"
envoy_config_cluster_v3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
envoy_config_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
envoy_config_endpoint_v3 "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
envoy_config_metrics_v3 "github.com/envoyproxy/go-control-plane/envoy/config/metrics/v3"
envoy_config_trace_v3 "github.com/envoyproxy/go-control-plane/envoy/config/trace/v3"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/ptypes"
"github.com/natefinch/atomic"
"github.com/rs/zerolog"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/types/known/durationpb"
"github.com/pomerium/pomerium/config"
"github.com/pomerium/pomerium/internal/log"
"github.com/pomerium/pomerium/internal/telemetry"
)
const (
workingDirectoryName = ".pomerium-envoy"
configFileName = "envoy-config.yaml"
)
// A Server is a pomerium proxy implemented via envoy.
type Server struct {
wd string
cmd *exec.Cmd
grpcPort, httpPort string
opts *config.Options
logLevel string
}
// NewServer creates a new server with traffic routed by envoy.
func NewServer(opts *config.Options, grpcPort, httpPort string) (*Server, error) {
wd := filepath.Join(os.TempDir(), workingDirectoryName)
err := os.MkdirAll(wd, 0755)
if err != nil {
return nil, fmt.Errorf("error creating temporary working directory for envoy: %w", err)
}
srv := &Server{
wd: wd,
grpcPort: grpcPort,
httpPort: httpPort,
opts: opts,
}
if srv.opts.ProxyLogLevel != "" {
srv.logLevel = srv.opts.ProxyLogLevel
} else {
srv.logLevel = srv.opts.LogLevel
}
err = srv.writeConfig()
if err != nil {
return nil, fmt.Errorf("error writing initial envoy configuration: %w", err)
}
return srv, nil
}
// Run runs the server by extracting the embedded envoy and then executing it.
func (srv *Server) Run(ctx context.Context) error {
envoyPath, err := extractEmbeddedEnvoy()
if err != nil {
log.Warn().Err(err).Send()
envoyPath = "envoy"
}
srv.cmd = exec.CommandContext(ctx, envoyPath,
"-c", configFileName,
"--log-level", srv.logLevel,
"--log-format", "[LOG_FORMAT]%l--%n--%v",
"--log-format-escaped",
"--disable-hot-restart",
)
srv.cmd.Dir = srv.wd
stderr, err := srv.cmd.StderrPipe()
if err != nil {
return fmt.Errorf("error creating stderr pipe for envoy: %w", err)
}
go srv.handleLogs(stderr)
stdout, err := srv.cmd.StdoutPipe()
if err != nil {
return fmt.Errorf("error creating stderr pipe for envoy: %w", err)
}
go srv.handleLogs(stdout)
// make sure envoy is killed if we're killed
srv.cmd.SysProcAttr = sysProcAttr
err = srv.cmd.Run()
if err == nil {
return errors.New("envoy exited without error")
}
return fmt.Errorf("envoy exited: %w", err)
}
func (srv *Server) writeConfig() error {
confBytes, err := srv.buildBootstrapConfig()
if err != nil {
return err
}
cfgPath := filepath.Join(srv.wd, configFileName)
log.WithLevel(zerolog.DebugLevel).Str("service", "envoy").Str("location", cfgPath).Msg("wrote config file to location")
return atomic.WriteFile(cfgPath, bytes.NewReader(confBytes))
}
func (srv *Server) buildBootstrapConfig() ([]byte, error) {
nodeCfg := &envoy_config_core_v3.Node{
Id: "proxy",
Cluster: "proxy",
}
adminCfg := &envoy_config_bootstrap_v3.Admin{
AccessLogPath: "/tmp/admin_access.log",
Address: &envoy_config_core_v3.Address{
Address: &envoy_config_core_v3.Address_SocketAddress{
SocketAddress: &envoy_config_core_v3.SocketAddress{
Address: "127.0.0.1",
PortSpecifier: &envoy_config_core_v3.SocketAddress_PortValue{
PortValue: 9901,
},
},
},
},
}
dynamicCfg := &envoy_config_bootstrap_v3.Bootstrap_DynamicResources{
AdsConfig: &envoy_config_core_v3.ApiConfigSource{
ApiType: envoy_config_core_v3.ApiConfigSource_ApiType(envoy_config_core_v3.ApiConfigSource_ApiType_value["GRPC"]),
TransportApiVersion: envoy_config_core_v3.ApiVersion_V3,
GrpcServices: []*envoy_config_core_v3.GrpcService{
{
TargetSpecifier: &envoy_config_core_v3.GrpcService_EnvoyGrpc_{
EnvoyGrpc: &envoy_config_core_v3.GrpcService_EnvoyGrpc{
ClusterName: "pomerium-control-plane-grpc",
},
},
},
},
},
LdsConfig: &envoy_config_core_v3.ConfigSource{
ResourceApiVersion: envoy_config_core_v3.ApiVersion_V3,
ConfigSourceSpecifier: &envoy_config_core_v3.ConfigSource_Ads{},
},
CdsConfig: &envoy_config_core_v3.ConfigSource{
ResourceApiVersion: envoy_config_core_v3.ApiVersion_V3,
ConfigSourceSpecifier: &envoy_config_core_v3.ConfigSource_Ads{},
},
}
controlPlanePort, err := strconv.Atoi(srv.grpcPort)
if err != nil {
return nil, fmt.Errorf("invalid control plane port: %w", err)
}
controlPlaneEndpoint := &envoy_config_endpoint_v3.LbEndpoint_Endpoint{
Endpoint: &envoy_config_endpoint_v3.Endpoint{
Address: &envoy_config_core_v3.Address{
Address: &envoy_config_core_v3.Address_SocketAddress{
SocketAddress: &envoy_config_core_v3.SocketAddress{
Address: "127.0.0.1",
PortSpecifier: &envoy_config_core_v3.SocketAddress_PortValue{
PortValue: uint32(controlPlanePort),
},
},
},
},
},
}
controlPlaneCluster := &envoy_config_cluster_v3.Cluster{
Name: "pomerium-control-plane-grpc",
ConnectTimeout: &durationpb.Duration{
Seconds: 5,
},
ClusterDiscoveryType: &envoy_config_cluster_v3.Cluster_Type{
Type: envoy_config_cluster_v3.Cluster_STATIC,
},
LbPolicy: envoy_config_cluster_v3.Cluster_ROUND_ROBIN,
LoadAssignment: &envoy_config_endpoint_v3.ClusterLoadAssignment{
ClusterName: "pomerium-control-plane-grpc",
Endpoints: []*envoy_config_endpoint_v3.LocalityLbEndpoints{
{
LbEndpoints: []*envoy_config_endpoint_v3.LbEndpoint{
{
HostIdentifier: controlPlaneEndpoint,
},
},
},
},
},
Http2ProtocolOptions: &envoy_config_core_v3.Http2ProtocolOptions{},
}
staticCfg := &envoy_config_bootstrap_v3.Bootstrap_StaticResources{
Clusters: []*envoy_config_cluster_v3.Cluster{
controlPlaneCluster,
},
}
cfg := &envoy_config_bootstrap_v3.Bootstrap{
Node: nodeCfg,
Admin: adminCfg,
DynamicResources: dynamicCfg,
StaticResources: staticCfg,
StatsConfig: srv.buildStatsConfig(),
}
traceOpts, err := config.NewTracingOptions(srv.opts)
if err != nil {
return nil, fmt.Errorf("invalid tracing config: %w", err)
}
if err := srv.addTraceConfig(traceOpts, cfg); err != nil {
return nil, fmt.Errorf("failed to add tracing config: %w", err)
}
jsonBytes, err := protojson.Marshal(proto.MessageV2(cfg))
if err != nil {
return nil, err
}
return jsonBytes, nil
}
func (srv *Server) buildStatsConfig() *envoy_config_metrics_v3.StatsConfig {
cfg := &envoy_config_metrics_v3.StatsConfig{}
cfg.StatsTags = []*envoy_config_metrics_v3.TagSpecifier{
{
TagName: "service",
TagValue: &envoy_config_metrics_v3.TagSpecifier_FixedValue{
FixedValue: telemetry.ServiceName(srv.opts.Services),
},
},
}
return cfg
}
func (srv *Server) addTraceConfig(traceOpts *config.TracingOptions, bootCfg *envoy_config_bootstrap_v3.Bootstrap) error {
if !traceOpts.Enabled() {
return nil
}
// We only support zipkin in envoy currently
if traceOpts.Provider != config.ZipkinTracingProviderName {
return nil
}
if traceOpts.ZipkinEndpoint.String() == "" {
return fmt.Errorf("missing zipkin url")
}
// TODO the outbound header list should be configurable when this moves to
// HTTPConnectionManager filters
tracingTC, _ := ptypes.MarshalAny(
&envoy_config_trace_v3.OpenCensusConfig{
ZipkinExporterEnabled: true,
ZipkinUrl: traceOpts.ZipkinEndpoint.String(),
IncomingTraceContext: []envoy_config_trace_v3.OpenCensusConfig_TraceContext{
envoy_config_trace_v3.OpenCensusConfig_B3,
envoy_config_trace_v3.OpenCensusConfig_TRACE_CONTEXT,
envoy_config_trace_v3.OpenCensusConfig_CLOUD_TRACE_CONTEXT,
envoy_config_trace_v3.OpenCensusConfig_GRPC_TRACE_BIN,
},
OutgoingTraceContext: []envoy_config_trace_v3.OpenCensusConfig_TraceContext{
envoy_config_trace_v3.OpenCensusConfig_B3,
envoy_config_trace_v3.OpenCensusConfig_TRACE_CONTEXT,
envoy_config_trace_v3.OpenCensusConfig_GRPC_TRACE_BIN,
},
},
)
tracingCfg := &envoy_config_trace_v3.Tracing{
Http: &envoy_config_trace_v3.Tracing_Http{
Name: "envoy.tracers.opencensus",
ConfigType: &envoy_config_trace_v3.Tracing_Http_TypedConfig{
TypedConfig: tracingTC,
},
},
}
bootCfg.Tracing = tracingCfg
return nil
}
var fileNameAndNumberRE = regexp.MustCompile(`^(\[[a-zA-Z0-9/-_.]+:[0-9]+])\s(.*)$`)
func (srv *Server) parseLog(line string) (name string, logLevel string, msg string) {
// format: [LOG_FORMAT]level--name--message
// message is c-escaped
parts := strings.SplitN(line, "--", 3)
if len(parts) == 3 {
logLevel = strings.TrimPrefix(parts[0], "[LOG_FORMAT]")
name = parts[1]
msg = parts[2]
}
return
}
func (srv *Server) handleLogs(rc io.ReadCloser) {
defer rc.Close()
s := bufio.NewReader(rc)
for {
ln, err := s.ReadString('\n')
if err != nil {
if err == io.EOF {
break
}
log.Error().Err(err).Msg("failed to read log")
continue
}
ln = strings.TrimRight(ln, "\r\n")
name, logLevel, msg := srv.parseLog(ln)
if name == "" {
name = "envoy"
}
lvl := zerolog.DebugLevel
if x, err := zerolog.ParseLevel(logLevel); err == nil {
lvl = x
}
if msg == "" {
msg = ln
}
msg = fileNameAndNumberRE.ReplaceAllString(msg, "\"$2\"")
if s, err := strconv.Unquote(msg); err == nil {
msg = s
}
log.WithLevel(lvl).
Str("service", "envoy").
Str("name", name).
Msg(msg)
}
}