mirror of https://github.com/status-im/consul.git
388 lines
12 KiB
Go
388 lines
12 KiB
Go
package envoy
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import (
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"errors"
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"flag"
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"fmt"
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"net"
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"os"
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"os/exec"
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"strconv"
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"strings"
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"github.com/mitchellh/mapstructure"
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proxyAgent "github.com/hashicorp/consul/agent/proxyprocess"
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"github.com/hashicorp/consul/agent/xds"
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"github.com/hashicorp/consul/api"
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proxyCmd "github.com/hashicorp/consul/command/connect/proxy"
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"github.com/hashicorp/consul/command/flags"
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"github.com/mitchellh/cli"
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)
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func New(ui cli.Ui) *cmd {
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ui = &cli.PrefixedUi{
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OutputPrefix: "==> ",
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InfoPrefix: " ",
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ErrorPrefix: "==> ",
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Ui: ui,
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}
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c := &cmd{UI: ui}
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c.init()
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return c
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}
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const DefaultAdminAccessLogPath = "/dev/null"
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type cmd struct {
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UI cli.Ui
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flags *flag.FlagSet
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http *flags.HTTPFlags
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help string
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client *api.Client
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// flags
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proxyID string
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sidecarFor string
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adminAccessLogPath string
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adminBind string
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envoyBin string
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bootstrap bool
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disableCentralConfig bool
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grpcAddr string
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}
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func (c *cmd) init() {
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c.flags = flag.NewFlagSet("", flag.ContinueOnError)
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c.flags.StringVar(&c.proxyID, "proxy-id", "",
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"The proxy's ID on the local agent.")
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c.flags.StringVar(&c.sidecarFor, "sidecar-for", "",
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"The ID of a service instance on the local agent that this proxy should "+
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"become a sidecar for. It requires that the proxy service is registered "+
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"with the agent as a connect-proxy with Proxy.DestinationServiceID set "+
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"to this value. If more than one such proxy is registered it will fail.")
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c.flags.StringVar(&c.envoyBin, "envoy-binary", "",
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"The full path to the envoy binary to run. By default will just search "+
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"$PATH. Ignored if -bootstrap is used.")
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c.flags.StringVar(&c.adminAccessLogPath, "admin-access-log-path", DefaultAdminAccessLogPath,
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fmt.Sprintf("The path to write the access log for the administration server. If no access "+
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"log is desired specify %q. By default it will use %q.",
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DefaultAdminAccessLogPath, DefaultAdminAccessLogPath))
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c.flags.StringVar(&c.adminBind, "admin-bind", "localhost:19000",
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"The address:port to start envoy's admin server on. Envoy requires this "+
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"but care must be taken to ensure it's not exposed to an untrusted network "+
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"as it has full control over the secrets and config of the proxy.")
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c.flags.BoolVar(&c.bootstrap, "bootstrap", false,
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"Generate the bootstrap.json but don't exec envoy")
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c.flags.BoolVar(&c.disableCentralConfig, "no-central-config", false,
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"By default the proxy's bootstrap configuration can be customized "+
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"centrally. This requires that the command run on the same agent as the "+
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"proxy will and that the agent is reachable when the command is run. In "+
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"cases where either assumption is violated this flag will prevent the "+
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"command attempting to resolve config from the local agent.")
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c.flags.StringVar(&c.grpcAddr, "grpc-addr", "",
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"Set the agent's gRPC address and port (in http(s)://host:port format). "+
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"Alternatively, you can specify CONSUL_GRPC_ADDR in ENV.")
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c.http = &flags.HTTPFlags{}
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flags.Merge(c.flags, c.http.ClientFlags())
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c.help = flags.Usage(help, c.flags)
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}
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func (c *cmd) Run(args []string) int {
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if err := c.flags.Parse(args); err != nil {
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return 1
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}
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passThroughArgs := c.flags.Args()
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// Load the proxy ID and token from env vars if they're set
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if c.proxyID == "" {
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c.proxyID = os.Getenv(proxyAgent.EnvProxyID)
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}
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if c.sidecarFor == "" {
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c.sidecarFor = os.Getenv(proxyAgent.EnvSidecarFor)
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}
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if c.grpcAddr == "" {
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c.grpcAddr = os.Getenv(api.GRPCAddrEnvName)
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}
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if c.http.Token() == "" && c.http.TokenFile() == "" {
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// Extra check needed since CONSUL_HTTP_TOKEN has not been consulted yet but
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// calling SetToken with empty will force that to override the
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if proxyToken := os.Getenv(proxyAgent.EnvProxyToken); proxyToken != "" {
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c.http.SetToken(proxyToken)
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}
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}
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// Setup Consul client
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client, err := c.http.APIClient()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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return 1
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}
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c.client = client
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// See if we need to lookup proxyID
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if c.proxyID == "" && c.sidecarFor != "" {
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proxyID, err := c.lookupProxyIDForSidecar()
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if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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c.proxyID = proxyID
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}
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if c.proxyID == "" {
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c.UI.Error("No proxy ID specified. One of -proxy-id or -sidecar-for is " +
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"required")
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return 1
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}
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// See if we need to lookup grpcAddr
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if c.grpcAddr == "" {
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port, err := c.lookupGRPCPort()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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}
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if port <= 0 {
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// This is the dev mode default and recommended production setting if
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// enabled.
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port = 8502
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c.UI.Info(fmt.Sprintf("Defaulting to grpc port = %d", port))
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}
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c.grpcAddr = fmt.Sprintf("localhost:%v", port)
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}
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// Generate config
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bootstrapJson, err := c.generateConfig()
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if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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if c.bootstrap {
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// Just output it and we are done
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os.Stdout.Write(bootstrapJson)
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return 0
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}
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// Find Envoy binary
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binary, err := c.findBinary()
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if err != nil {
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c.UI.Error("Couldn't find envoy binary: " + err.Error())
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return 1
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}
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err = execEnvoy(binary, nil, passThroughArgs, bootstrapJson)
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if err == errUnsupportedOS {
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c.UI.Error("Directly running Envoy is only supported on linux and macOS " +
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"since envoy itself doesn't build on other platforms currently.")
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c.UI.Error("Use the -bootstrap option to generate the JSON to use when running envoy " +
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"on a supported OS or via a container or VM.")
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return 1
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} else if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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return 0
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}
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var errUnsupportedOS = errors.New("envoy: not implemented on this operating system")
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func (c *cmd) findBinary() (string, error) {
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if c.envoyBin != "" {
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return c.envoyBin, nil
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}
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return exec.LookPath("envoy")
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}
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func (c *cmd) templateArgs() (*BootstrapTplArgs, error) {
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httpCfg := api.DefaultConfig()
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c.http.MergeOntoConfig(httpCfg)
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// Trigger the Client init to do any last-minute updates to the Config.
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if _, err := api.NewClient(httpCfg); err != nil {
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return nil, err
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}
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// Decide on TLS if the scheme is provided and indicates it, if the HTTP env
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// suggests TLS is supported explicitly (CONSUL_HTTP_SSL) or implicitly
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// (CONSUL_HTTP_ADDR) is https://
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useTLS := false
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if strings.HasPrefix(strings.ToLower(c.grpcAddr), "https://") {
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useTLS = true
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} else if useSSLEnv := os.Getenv(api.HTTPSSLEnvName); useSSLEnv != "" {
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if enabled, err := strconv.ParseBool(useSSLEnv); err != nil {
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useTLS = enabled
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}
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} else if strings.HasPrefix(strings.ToLower(httpCfg.Address), "https://") {
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useTLS = true
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}
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// We want to allow grpcAddr set as host:port with no scheme but if the host
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// is an IP this will fail to parse as a URL with "parse 127.0.0.1:8500: first
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// path segment in URL cannot contain colon". On the other hand we also
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// support both http(s)://host:port and unix:///path/to/file.
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addrPort := strings.TrimPrefix(c.grpcAddr, "http://")
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addrPort = strings.TrimPrefix(c.grpcAddr, "https://")
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agentAddr, agentPort, err := net.SplitHostPort(addrPort)
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if err != nil {
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return nil, fmt.Errorf("Invalid Consul HTTP address: %s", err)
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}
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if agentAddr == "" {
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agentAddr = "127.0.0.1"
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}
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// We use STATIC for agent which means we need to resolve DNS names like
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// `localhost` ourselves. We could use STRICT_DNS or LOGICAL_DNS with envoy
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// but Envoy resolves `localhost` differently to go on macOS at least which
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// causes paper cuts like default dev agent (which binds specifically to
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// 127.0.0.1) isn't reachable since Envoy resolves localhost to `[::]` and
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// can't connect.
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agentIP, err := net.ResolveIPAddr("ip", agentAddr)
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if err != nil {
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return nil, fmt.Errorf("Failed to resolve agent address: %s", err)
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}
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adminAddr, adminPort, err := net.SplitHostPort(c.adminBind)
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if err != nil {
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return nil, fmt.Errorf("Invalid Consul HTTP address: %s", err)
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}
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// Envoy requires IP addresses to bind too when using static so resolve DNS or
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// localhost here.
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adminBindIP, err := net.ResolveIPAddr("ip", adminAddr)
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if err != nil {
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return nil, fmt.Errorf("Failed to resolve admin bind address: %s", err)
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}
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// Ideally the cluster should be the service name. We may or may not have that
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// yet depending on the arguments used so make a best effort here. In the
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// common case, even if the command was invoked with proxy-id and we don't
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// know service name yet, we will after we resolve the proxy's config in a bit
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// and will update this then.
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cluster := c.proxyID
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if c.sidecarFor != "" {
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cluster = c.sidecarFor
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}
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adminAccessLogPath := c.adminAccessLogPath
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if adminAccessLogPath == "" {
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adminAccessLogPath = DefaultAdminAccessLogPath
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}
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return &BootstrapTplArgs{
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ProxyCluster: cluster,
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ProxyID: c.proxyID,
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AgentAddress: agentIP.String(),
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AgentPort: agentPort,
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AgentTLS: useTLS,
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AgentCAFile: httpCfg.TLSConfig.CAFile,
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AdminAccessLogPath: adminAccessLogPath,
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AdminBindAddress: adminBindIP.String(),
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AdminBindPort: adminPort,
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Token: httpCfg.Token,
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LocalAgentClusterName: xds.LocalAgentClusterName,
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}, nil
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}
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func (c *cmd) generateConfig() ([]byte, error) {
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args, err := c.templateArgs()
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if err != nil {
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return nil, err
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}
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var bsCfg BootstrapConfig
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if !c.disableCentralConfig {
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// Fetch any customization from the registration
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svc, _, err := c.client.Agent().Service(c.proxyID, nil)
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if err != nil {
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return nil, fmt.Errorf("failed fetch proxy config from local agent: %s", err)
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}
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if svc.Proxy == nil {
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return nil, errors.New("service is not a Connect proxy")
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}
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// Parse the bootstrap config
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if err := mapstructure.WeakDecode(svc.Proxy.Config, &bsCfg); err != nil {
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return nil, fmt.Errorf("failed parsing Proxy.Config: %s", err)
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}
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// Override cluster now we know the actual service name
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args.ProxyCluster = svc.Proxy.DestinationServiceName
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}
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return bsCfg.GenerateJSON(args)
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}
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func (c *cmd) lookupProxyIDForSidecar() (string, error) {
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return proxyCmd.LookupProxyIDForSidecar(c.client, c.sidecarFor)
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}
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func (c *cmd) lookupGRPCPort() (int, error) {
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self, err := c.client.Agent().Self()
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if err != nil {
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return 0, err
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}
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cfg, ok := self["DebugConfig"]
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if !ok {
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return 0, fmt.Errorf("unexpected agent response: no debug config")
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}
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port, ok := cfg["GRPCPort"]
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if !ok {
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return 0, fmt.Errorf("agent does not have grpc port enabled")
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}
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portN, ok := port.(float64)
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if !ok {
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return 0, fmt.Errorf("invalid grpc port in agent response")
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}
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return int(portN), nil
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}
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func (c *cmd) Synopsis() string {
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return synopsis
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}
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func (c *cmd) Help() string {
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return c.help
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}
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const synopsis = "Runs or Configures Envoy as a Connect proxy"
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const help = `
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Usage: consul connect envoy [options]
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Generates the bootstrap configuration needed to start an Envoy proxy instance
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for use as a Connect sidecar for a particular service instance. By default it
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will generate the config and then exec Envoy directly until it exits normally.
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It will search $PATH for the envoy binary but this can be overridden with
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-envoy-binary.
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It can instead only generate the bootstrap.json based on the current ENV and
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arguments using -bootstrap.
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The proxy requires service:write permissions for the service it represents.
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The token may be passed via the CLI or the CONSUL_TOKEN environment
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variable.
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The example below shows how to start a local proxy as a sidecar to a "web"
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service instance. It assumes that the proxy was already registered with it's
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Config for example via a sidecar_service block.
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$ consul connect envoy -sidecar-for web
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`
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