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package clients
import (
"errors"
"fmt"
"runtime"
"strings"
"github.com/mimecast/dtail/internal/clients/handlers"
"github.com/mimecast/dtail/internal/clients/remote"
"github.com/mimecast/dtail/internal/omode"
"github.com/mimecast/dtail/internal/ssh/client"
gossh "golang.org/x/crypto/ssh"
)
// GrepClient searches a remote file for all lines matching a regular expression. Only the matching lines are displayed.
type GrepClient struct {
baseClient
}
// NewGrepClient creates a new grep client.
func NewGrepClient(args Args) (*GrepClient, error) {
if args.Regex == "" {
return nil, errors.New("No regex specified, use '-regex' flag")
}
args.Mode = omode.GrepClient
c := GrepClient{
baseClient: baseClient{
Args: args,
stop: make(chan struct{}),
stopped: make(chan struct{}),
throttleCh: make(chan struct{}, args.ConnectionsPerCPU*runtime.NumCPU()),
retry: false,
},
}
c.init(c)
return &c, nil
}
func (c GrepClient) makeConnection(server string, sshAuthMethods []gossh.AuthMethod, hostKeyCallback *client.HostKeyCallback) *remote.Connection {
conn := remote.NewConnection(server, c.UserName, sshAuthMethods, hostKeyCallback)
conn.Handler = handlers.NewClientHandler(server, c.PingTimeout)
for _, file := range strings.Split(c.Files, ",") {
conn.Commands = append(conn.Commands, fmt.Sprintf("%s %s regex %s", c.Mode.String(), file, c.Regex))
}
return conn
}
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