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workflow.go
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workflow.go
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// Copyright 2021 Northern.tech AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package model
import (
"encoding/json"
"io/ioutil"
"path/filepath"
"strings"
"github.com/mendersoftware/go-lib-micro/log"
"github.com/pkg/errors"
"gopkg.in/yaml.v3"
)
const DefaultTopic = "default"
// Workflow stores the definition of a workflow
type Workflow struct {
Name string `json:"name" bson:"_id"`
Topic string `json:"topic" bson:"topic"`
Ephemeral bool `json:"ephemeral" bson:"ephemeral"`
Description string `json:"description" bson:"description"`
Version int `json:"version" bson:"version"`
SchemaVersion int `json:"schemaVersion" bson:"schema_version"`
Tasks []Task `json:"tasks" bson:"tasks"`
InputParameters []string `json:"inputParameters" bson:"input_parameters"`
OptionalParameters []string `json:"optionalParameters" bson:"optional_parameters,omitempty"`
}
// ParseWorkflowFromJSON parse a JSON string and returns a Workflow struct
func ParseWorkflowFromJSON(jsonData []byte) (*Workflow, error) {
var workflow Workflow
if err := json.Unmarshal(jsonData, &workflow); err != nil {
return nil, errors.Wrap(err, "unable to parse the JSON")
}
return &workflow, nil
}
// GetWorkflowsFromPath parse the workflows stored as JSON files in a directory and returns them
func GetWorkflowsFromPath(path string) map[string]*Workflow {
var workflows = make(map[string]*Workflow)
l := log.NewEmpty()
files, err := ioutil.ReadDir(path)
if err != nil {
return nil
}
for _, f := range files {
if !(strings.HasSuffix(f.Name(), ".json") ||
strings.HasSuffix(f.Name(), ".yml") ||
strings.HasSuffix(f.Name(), ".yaml")) {
continue
}
fn := filepath.Join(path, f.Name())
if data, err := ioutil.ReadFile(fn); err == nil {
var workflow = &Workflow{}
if strings.HasSuffix(f.Name(), ".json") {
workflow, err = ParseWorkflowFromJSON(data)
} else {
err = yaml.Unmarshal(data, workflow)
}
if err != nil {
l.Warn(err.Error())
continue
}
if workflows[workflow.Name] == nil ||
workflows[workflow.Name].Version <= workflow.Version {
workflows[workflow.Name] = workflow
}
}
}
return workflows
}