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loaders.go
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loaders.go
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// Copyright 2016-2021, Pulumi Corporation.
//
// 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 workspace
import (
"os"
"sync"
"github.com/pulumi/pulumi/sdk/v2/go/common/encoding"
"github.com/pulumi/pulumi/sdk/v2/go/common/resource/config"
"github.com/pulumi/pulumi/sdk/v2/go/common/util/contract"
)
// projectSingleton is a singleton instance of projectLoader, which controls a global map of instances of Project
// configs (one per path).
var projectSingleton *projectLoader = &projectLoader{
internal: map[string]*Project{},
}
// projectStackSingleton is a singleton instance of projectStackLoader, which controls a global map of instances of
// ProjectStack configs (one per path).
var projectStackSingleton *projectStackLoader = &projectStackLoader{
internal: map[string]*ProjectStack{},
}
// pluginProjectSingleton is a singleton instance of pluginProjectLoader, which controls a global map of instances of
// PluginProject configs (one per path).
var pluginProjectSingleton *pluginProjectLoader = &pluginProjectLoader{
internal: map[string]*PluginProject{},
}
// policyPackProjectSingleton is a singleton instance of policyPackProjectLoader, which controls a global map of
// instances of PolicyPackProject configs (one per path).
var policyPackProjectSingleton *policyPackProjectLoader = &policyPackProjectLoader{
internal: map[string]*PolicyPackProject{},
}
// readFile wraps os.ReadFile and also strips the Byte-order Mark (BOM) if present.
func readFile(path string) ([]byte, error) {
b, err := os.ReadFile(path)
if err != nil {
return nil, err
}
// Strip BOM bytes if present to avoid problems with downstream parsing.
// References:
// https://github.com/spkg/bom
// https://en.wikipedia.org/wiki/Byte_order_mark
if len(b) >= 3 &&
b[0] == 0xef &&
b[1] == 0xbb &&
b[2] == 0xbf {
b = b[3:]
}
return b, nil
}
// projectLoader is used to load a single global instance of a Project config.
type projectLoader struct {
sync.RWMutex
internal map[string]*Project
}
// Load a Project config file from the specified path. The configuration will be cached for subsequent loads.
func (singleton *projectLoader) load(path string) (*Project, error) {
singleton.Lock()
defer singleton.Unlock()
if v, ok := singleton.internal[path]; ok {
return v, nil
}
marshaller, err := marshallerForPath(path)
if err != nil {
return nil, err
}
b, err := readFile(path)
if err != nil {
return nil, err
}
var project Project
err = marshaller.Unmarshal(b, &project)
if err != nil {
return nil, err
}
project.FileAST, err = encoding.NewFileAST(b)
if err != nil {
return nil, err
}
err = project.Validate()
if err != nil {
return nil, err
}
singleton.internal[path] = &project
return &project, nil
}
// projectStackLoader is used to load a single global instance of a ProjectStack config.
type projectStackLoader struct {
sync.RWMutex
internal map[string]*ProjectStack
}
// Load a ProjectStack config file from the specified path. The configuration will be cached for subsequent loads.
func (singleton *projectStackLoader) load(path string) (*ProjectStack, error) {
singleton.Lock()
defer singleton.Unlock()
if v, ok := singleton.internal[path]; ok {
return v, nil
}
marshaler, err := marshallerForPath(path)
if err != nil {
return nil, err
}
var projectStack ProjectStack
b, err := readFile(path)
if os.IsNotExist(err) {
projectStack = ProjectStack{
Config: make(config.Map),
FileAST: &encoding.FileAST{},
}
singleton.internal[path] = &projectStack
return &projectStack, nil
} else if err != nil {
return nil, err
}
err = marshaler.Unmarshal(b, &projectStack)
if err != nil {
return nil, err
}
if projectStack.Config == nil {
projectStack.Config = make(config.Map)
}
projectStack.FileAST, err = encoding.NewFileAST(b)
if err != nil {
return nil, err
}
singleton.internal[path] = &projectStack
return &projectStack, nil
}
// pluginProjectLoader is used to load a single global instance of a PluginProject config.
type pluginProjectLoader struct {
sync.RWMutex
internal map[string]*PluginProject
}
// Load a PluginProject config file from the specified path. The configuration will be cached for subsequent loads.
func (singleton *pluginProjectLoader) load(path string) (*PluginProject, error) {
singleton.Lock()
defer singleton.Unlock()
if result, ok := singleton.internal[path]; ok {
return result, nil
}
marshaller, err := marshallerForPath(path)
if err != nil {
return nil, err
}
b, err := readFile(path)
if err != nil {
return nil, err
}
var pluginProject PluginProject
err = marshaller.Unmarshal(b, &pluginProject)
if err != nil {
return nil, err
}
err = pluginProject.Validate()
if err != nil {
return nil, err
}
singleton.internal[path] = &pluginProject
return &pluginProject, nil
}
// policyPackProjectLoader is used to load a single global instance of a PolicyPackProject config.
type policyPackProjectLoader struct {
sync.RWMutex
internal map[string]*PolicyPackProject
}
// Load a PolicyPackProject config file from the specified path. The configuration will be cached for subsequent loads.
func (singleton *policyPackProjectLoader) load(path string) (*PolicyPackProject, error) {
singleton.Lock()
defer singleton.Unlock()
if result, ok := singleton.internal[path]; ok {
return result, nil
}
marshaller, err := marshallerForPath(path)
if err != nil {
return nil, err
}
b, err := readFile(path)
if err != nil {
return nil, err
}
var policyPackProject PolicyPackProject
err = marshaller.Unmarshal(b, &policyPackProject)
if err != nil {
return nil, err
}
err = policyPackProject.Validate()
if err != nil {
return nil, err
}
singleton.internal[path] = &policyPackProject
return &policyPackProject, nil
}
// LoadProject reads a project definition from a file.
func LoadProject(path string) (*Project, error) {
contract.Require(path != "", "path")
return projectSingleton.load(path)
}
// LoadProjectStack reads a stack definition from a file.
func LoadProjectStack(path string) (*ProjectStack, error) {
contract.Require(path != "", "path")
return projectStackSingleton.load(path)
}
// LoadPluginProject reads a plugin project definition from a file.
func LoadPluginProject(path string) (*PluginProject, error) {
contract.Require(path != "", "path")
return pluginProjectSingleton.load(path)
}
// LoadPolicyPack reads a policy pack definition from a file.
func LoadPolicyPack(path string) (*PolicyPackProject, error) {
contract.Require(path != "", "path")
return policyPackProjectSingleton.load(path)
}