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package command
import (
"fmt"
"io"
"os"
)
// Orchestrator type acts as an enum describing supported orchestrators.
type Orchestrator string
const (
// OrchestratorKubernetes orchestrator
OrchestratorKubernetes = Orchestrator("kubernetes")
// OrchestratorSwarm orchestrator
OrchestratorSwarm = Orchestrator("swarm")
// OrchestratorAll orchestrator
OrchestratorAll = Orchestrator("all")
orchestratorUnset = Orchestrator("unset")
defaultOrchestrator = OrchestratorSwarm
envVarDockerStackOrchestrator = "DOCKER_STACK_ORCHESTRATOR"
envVarDockerOrchestrator = "DOCKER_ORCHESTRATOR"
)
// HasKubernetes returns true if defined orchestrator has Kubernetes capabilities.
func (o Orchestrator) HasKubernetes() bool {
return o == OrchestratorKubernetes || o == OrchestratorAll
}
// HasSwarm returns true if defined orchestrator has Swarm capabilities.
func (o Orchestrator) HasSwarm() bool {
return o == OrchestratorSwarm || o == OrchestratorAll
}
// HasAll returns true if defined orchestrator has both Swarm and Kubernetes capabilities.
func (o Orchestrator) HasAll() bool {
return o == OrchestratorAll
}
func normalize(value string) (Orchestrator, error) {
switch value {
case "kubernetes":
return OrchestratorKubernetes, nil
case "swarm":
return OrchestratorSwarm, nil
case "":
return orchestratorUnset, nil
case "all":
return OrchestratorAll, nil
default:
return defaultOrchestrator, fmt.Errorf("specified orchestrator %q is invalid, please use either kubernetes, swarm or all", value)
}
}
// GetStackOrchestrator checks DOCKER_STACK_ORCHESTRATOR environment variable and configuration file
// orchestrator value and returns user defined Orchestrator.
func GetStackOrchestrator(flagValue, value string, stderr io.Writer) (Orchestrator, error) {
// Check flag
if o, err := normalize(flagValue); o != orchestratorUnset {
return o, err
}
// Check environment variable
env := os.Getenv(envVarDockerStackOrchestrator)
if env == "" && os.Getenv(envVarDockerOrchestrator) != "" {
fmt.Fprintf(stderr, "WARNING: experimental environment variable %s is set. Please use %s instead\n", envVarDockerOrchestrator, envVarDockerStackOrchestrator)
}
if o, err := normalize(env); o != orchestratorUnset {
return o, err
}
// Check specified orchestrator
if o, err := normalize(value); o != orchestratorUnset {
return o, err
}
// Nothing set, use default orchestrator
return defaultOrchestrator, nil
}