feat: add logs command

cmd/logs.go

@@ -0,0 +1,176 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path"
+	"time"
+
+	"github.com/spf13/cobra"
+	"github.com/uselagoon/lagoon-cli/internal/lagoon"
+	"github.com/uselagoon/lagoon-cli/internal/lagoon/client"
+	lagoonssh "github.com/uselagoon/lagoon-cli/pkg/lagoon/ssh"
+	"github.com/uselagoon/lagoon-cli/pkg/output"
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/knownhosts"
+)
+
+var (
+	// connTimeout is the network connection timeout used for SSH connections and
+	// calls to the Lagoon API.
+	connTimeout = 8 * time.Second
+	// these variables are assigned in init() to flag values
+	logsService   string
+	logsContainer string
+	logsTailLines uint
+	logsFollow    bool
+)
+
+func init() {
+	logsCmd.Flags().StringVarP(&logsService, "service", "s", "", "specify a specific service name")
+	logsCmd.Flags().StringVarP(&logsContainer, "container", "c", "", "specify a specific container name")
+	logsCmd.Flags().UintVarP(&logsTailLines, "lines", "n", 32, "the number of lines to return for each container")
+	logsCmd.Flags().BoolVarP(&logsFollow, "follow", "f", false, "continue outputting new lines as they are logged")
+}
+
+func generateLogsCommand(service, container string, lines uint,
+	follow bool) ([]string, error) {
+	var argv []string
+	if service == "" {
+		return nil, fmt.Errorf("empty service name")
+	}
+	if unsafeRegex.MatchString(service) {
+		return nil, fmt.Errorf("service name contains invalid characters")
+	}
+	argv = append(argv, "service="+service)
+	if container != "" {
+		if unsafeRegex.MatchString(container) {
+			return nil, fmt.Errorf("container name contains invalid characters")
+		}
+		argv = append(argv, "container="+container)
+	}
+	logsCmd := fmt.Sprintf("logs=tailLines=%d", lines)
+	if follow {
+		logsCmd += ",follow"
+	}
+	argv = append(argv, logsCmd)
+	return argv, nil
+}
+
+func getSSHHostPort(environmentName string, debug bool) (string, string, error) {
+	current := lagoonCLIConfig.Current
+	// set the default ssh host and port to the core ssh endpoint
+	sshHost := lagoonCLIConfig.Lagoons[current].HostName
+	sshPort := lagoonCLIConfig.Lagoons[current].Port
+
+	// get SSH Portal endpoint if reqiured
+	if lagoonCLIConfig.Lagoons[current].SSHPortal {
+		lc := client.New(
+			lagoonCLIConfig.Lagoons[current].GraphQL,
+			lagoonCLIConfig.Lagoons[current].Token,
+			lagoonCLIConfig.Lagoons[current].Version,
+			lagoonCLIVersion,
+			debug)
+		ctx, cancel := context.WithTimeout(context.Background(), connTimeout)
+		defer cancel()
+		project, err := lagoon.GetSSHEndpointsByProject(ctx, cmdProjectName, lc)
+		if err != nil {
+			return "", "", fmt.Errorf("couldn't get SSH endpoint by project: %v", err)
+		}
+		// check all the environments for this project
+		for _, env := range project.Environments {
+			// if the env name matches the requested environment then check if the deploytarget supports regional ssh endpoints
+			if env.Name == environmentName {
+				// if the deploytarget supports regional endpoints, then set these as the host and port for ssh
+				if env.DeployTarget.SSHHost != "" && env.DeployTarget.SSHPort != "" {
+					sshHost = env.DeployTarget.SSHHost
+					sshPort = env.DeployTarget.SSHPort
+				}
+			}
+		}
+	}
+	return sshHost, sshPort, nil
+}
+
+func getSSHClientConfig(environmentName string) (*ssh.ClientConfig,
+	func() error, error) {
+	skipAgent := false
+	privateKey := fmt.Sprintf("%s/.ssh/id_rsa", userPath)
+	// check for user-defined key
+	if lagoonCLIConfig.Lagoons[lagoonCLIConfig.Current].SSHKey != "" {
+		privateKey = lagoonCLIConfig.Lagoons[lagoonCLIConfig.Current].SSHKey
+		skipAgent = true
+	}
+	// check for specified key
+	if cmdSSHKey != "" {
+		privateKey = cmdSSHKey
+		skipAgent = true
+	}
+	// parse known_hosts
+	kh, err := knownhosts.New(path.Join(userPath, ".ssh/known_hosts"))
+	if err != nil {
+		return nil, nil, fmt.Errorf("couldn't get ~/.ssh/known_hosts: %v", err)
+	}
+	// configure an SSH client session
+	authMethod, closeSSHAgent := publicKey(privateKey, skipAgent)
+	return &ssh.ClientConfig{
+		User:            cmdProjectName + "-" + environmentName,
+		Auth:            []ssh.AuthMethod{authMethod},
+		HostKeyCallback: kh,
+		Timeout:         connTimeout,
+	}, closeSSHAgent, nil
+}
+
+var logsCmd = &cobra.Command{
+	Use:   "logs",
+	Short: "Display logs for a service of an environment and project",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		// validate/refresh token
+		validateToken(lagoonCLIConfig.Current)
+		// validate and parse arguments
+		if cmdProjectName == "" || cmdProjectEnvironment == "" {
+			return fmt.Errorf(
+				"Missing arguments: Project name or environment name are not defined")
+		}
+		debug, err := cmd.Flags().GetBool("debug")
+		if err != nil {
+			return fmt.Errorf("couldn't get debug value: %v", err)
+		}
+		argv, err := generateLogsCommand(logsService, logsContainer, logsTailLines,
+			logsFollow)
+		if err != nil {
+			return fmt.Errorf("couldn't generate logs command: %v", err)
+		}
+		// replace characters in environment name to allow flexible referencing
+		environmentName := makeSafe(
+			shortenEnvironment(cmdProjectName, cmdProjectEnvironment))
+		// query the Lagoon API for the environment's SSH endpoint
+		sshHost, sshPort, err := getSSHHostPort(environmentName, debug)
+		if err != nil {
+			return fmt.Errorf("couldn't get SSH endpoint: %v", err)
+		}
+		// configure SSH client session
+		sshConfig, closeSSHAgent, err := getSSHClientConfig(environmentName)
+		if err != nil {
+			return fmt.Errorf("couldn't get SSH client config: %v", err)
+		}
+		defer closeSSHAgent()
+		// start SSH log streaming session
+		err = lagoonssh.LogStream(sshConfig, sshHost, sshPort, argv)
+		if err != nil {
+			output.RenderError(err.Error(), outputOptions)
+			switch e := err.(type) {
+			case *ssh.ExitMissingError:
+				// https://github.com/openssh/openssh-portable/blob/
+				// 	6958f00acf3b9e0b3730f7287e69996bcf3ceda4/fatal.c#L45
+				os.Exit(255)
+			case *ssh.ExitError:
+				os.Exit(e.ExitStatus())
+			default:
+				os.Exit(254) // internal error
+			}
+		}
+		return nil
+	},
+}

cmd/root.go

@@ -1,3 +1,4 @@
+// Package cmd implements the lagoon-cli command line interface.
 package cmd
 
 import (
@@ -194,6 +195,7 @@ Use "{{.CommandPath}} [command] --help" for more information about a command.{{e
 	rootCmd.AddCommand(importCmd)
 	rootCmd.AddCommand(exportCmd)
 	rootCmd.AddCommand(whoamiCmd)
+	rootCmd.AddCommand(logsCmd)
 }
 
 // version/build information command

pkg/lagoon/ssh/main.go

@@ -1,15 +1,41 @@
+// Package ssh implements an SSH client for Lagoon.
 package ssh
 
 import (
 	"bytes"
 	"errors"
 	"fmt"
 	"os"
+	"strings"
 
 	"golang.org/x/crypto/ssh"
 	"golang.org/x/crypto/ssh/terminal"
 )
 
+// LogStream connects to host:port using the given config, and executes the
+// argv command. It does not request a PTY, and instead just streams the
+// response to the attached terminal. argv should contain a logs=... argument.
+func LogStream(config *ssh.ClientConfig, host, port string, argv []string) error {
+	// https://stackoverflow.com/a/37088088
+	client, err := ssh.Dial("tcp", host+":"+port, config)
+	if err != nil {
+		return fmt.Errorf("couldn't dial SSH: %v", err)
+	}
+	session, err := client.NewSession()
+	if err != nil {
+		return fmt.Errorf("couldn't create SSH session: %v", err)
+	}
+	defer session.Close()
+	session.Stdout = os.Stdout
+	session.Stderr = os.Stderr
+	session.Stdin = os.Stdin
+	err = session.Start(strings.Join(argv, " "))
+	if err != nil {
+		return fmt.Errorf("couldn't start SSH session: %v", err)
+	}
+	return session.Wait()
+}
+
 // InteractiveSSH .
 func InteractiveSSH(lagoon map[string]string, sshService string, sshContainer string, config *ssh.ClientConfig) error {
 	client, err := ssh.Dial("tcp", lagoon["hostname"]+":"+lagoon["port"], config)