71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
package docklog
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import (
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"context"
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"os/exec"
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hclog "github.com/hashicorp/go-hclog"
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plugin "github.com/hashicorp/go-plugin"
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"github.com/hashicorp/nomad/drivers/docker/docklog/proto"
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"github.com/hashicorp/nomad/helper/discover"
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"github.com/hashicorp/nomad/plugins/base"
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"google.golang.org/grpc"
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)
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const pluginName = "docker_logger"
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// LaunchDockerLogger launches an instance of DockerLogger
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// TODO: Integrate with base plugin loader
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func LaunchDockerLogger(logger hclog.Logger) (DockerLogger, *plugin.Client, error) {
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logger = logger.Named(pluginName)
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bin, err := discover.NomadExecutable()
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if err != nil {
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return nil, nil, err
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}
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client := plugin.NewClient(&plugin.ClientConfig{
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HandshakeConfig: base.Handshake,
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Plugins: map[string]plugin.Plugin{
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pluginName: &Plugin{impl: NewDockerLogger(hclog.L().Named(pluginName))},
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},
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Cmd: exec.Command(bin, pluginName),
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AllowedProtocols: []plugin.Protocol{
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plugin.ProtocolGRPC,
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},
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})
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rpcClient, err := client.Client()
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if err != nil {
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return nil, nil, err
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}
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raw, err := rpcClient.Dispense(pluginName)
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if err != nil {
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return nil, nil, err
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}
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l := raw.(DockerLogger)
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return l, client, nil
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}
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// Plugin is the go-plugin implementation
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type Plugin struct {
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plugin.NetRPCUnsupportedPlugin
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impl DockerLogger
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}
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// GRPCServer registered the server side implementation with the grpc server
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func (p *Plugin) GRPCServer(broker *plugin.GRPCBroker, s *grpc.Server) error {
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proto.RegisterDockerLoggerServer(s, &dockerLoggerServer{
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impl: p.impl,
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broker: broker,
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})
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return nil
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}
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// GRPCClient returns a client side implementation of the plugin
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func (p *Plugin) GRPCClient(ctx context.Context, broker *plugin.GRPCBroker, c *grpc.ClientConn) (interface{}, error) {
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return &dockerLoggerClient{client: proto.NewDockerLoggerClient(c)}, nil
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}
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