base_app.go 5.51 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
// Copyright 2018 The ksonnet authors
//
//
//    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 app

import (
	"path/filepath"
bryanl's avatar
bryanl committed
20
	"sync"
21

bryanl's avatar
bryanl committed
22 23
	"github.com/ghodss/yaml"
	"github.com/pkg/errors"
24 25 26 27 28 29
	"github.com/spf13/afero"
)

type baseApp struct {
	root string
	fs   afero.Fs
bryanl's avatar
bryanl committed
30 31 32 33 34

	config    *Spec
	overrides *Override

	mu sync.Mutex
35 36 37 38
}

func newBaseApp(fs afero.Fs, root string) *baseApp {
	return &baseApp{
bryanl's avatar
bryanl committed
39 40 41 42 43 44 45
		fs:     fs,
		root:   root,
		config: &Spec{},
		overrides: &Override{
			Environments: EnvironmentSpecs{},
			Registries:   RegistryRefSpecs{},
		},
46 47 48
	}
}

bryanl's avatar
bryanl committed
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
func (ba *baseApp) CurrentEnvironment() string {
	currentPath := filepath.Join(ba.root, currentEnvName)
	data, err := afero.ReadFile(ba.fs, currentPath)
	if err != nil {
		return ""
	}

	return string(data)
}

func (ba *baseApp) SetCurrentEnvironment(name string) error {
	currentPath := filepath.Join(ba.root, currentEnvName)
	return afero.WriteFile(ba.fs, currentPath, []byte(name), DefaultFilePermissions)
}

bryanl's avatar
bryanl committed
64 65 66 67 68 69
func (ba *baseApp) configPath() string {
	return filepath.Join(ba.root, "app.yaml")
}

func (ba *baseApp) overridePath() string {
	return filepath.Join(ba.root, "app.override.yaml")
70 71
}

bryanl's avatar
bryanl committed
72 73 74 75 76
func (ba *baseApp) save() error {
	ba.mu.Lock()
	defer ba.mu.Unlock()

	configData, err := yaml.Marshal(ba.config)
77
	if err != nil {
bryanl's avatar
bryanl committed
78 79 80 81 82
		return errors.Wrap(err, "convert application configuration to YAML")
	}

	if err = afero.WriteFile(ba.fs, ba.configPath(), configData, DefaultFilePermissions); err != nil {
		return errors.Wrapf(err, "write %s", ba.configPath())
83 84
	}

bryanl's avatar
bryanl committed
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105
	if err = cleanOverride(ba.fs, ba.root); err != nil {
		return errors.Wrap(err, "clean overrides")
	}

	hasOverrides := false
	if len(ba.overrides.Environments) > 0 || len(ba.overrides.Registries) > 0 {
		hasOverrides = true
	}

	if hasOverrides {
		overrideData, err := yaml.Marshal(ba.overrides)
		if err != nil {
			return errors.Wrap(err, "convert override configuration to YAML")
		}

		if err = afero.WriteFile(ba.fs, overridePath(ba.root), overrideData, DefaultFilePermissions); err != nil {
			return errors.Wrapf(err, "write %s", overridePath(ba.root))
		}
	}

	return nil
106 107
}

bryanl's avatar
bryanl committed
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
func (ba *baseApp) cleanOverride() error {
	exists, err := afero.Exists(ba.fs, ba.overridePath())
	if err != nil {
		return err
	}

	if exists {
		return ba.fs.Remove(ba.overridePath())
	}

	return nil
}

func (ba *baseApp) load() error {
	ba.mu.Lock()
	defer ba.mu.Unlock()

	configData, err := afero.ReadFile(ba.fs, ba.configPath())
	if err != nil {
		return errors.Wrapf(err, "read %s", ba.configPath())
	}

	var config Spec
	if err = yaml.Unmarshal(configData, &config); err != nil {
		return errors.Wrapf(err, "unmarshal application YAML config")
	}

	exists, err := afero.Exists(ba.fs, ba.overridePath())
136 137 138 139
	if err != nil {
		return err
	}

bryanl's avatar
bryanl committed
140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
	if len(config.Environments) == 0 {
		config.Environments = EnvironmentSpecs{}
	}

	if len(config.Registries) == 0 {
		config.Registries = RegistryRefSpecs{}
	}

	override := Override{
		Environments: EnvironmentSpecs{},
		Registries:   RegistryRefSpecs{},
	}
	if exists {
		overrideData, err := afero.ReadFile(ba.fs, ba.overridePath())
		if err != nil {
			return errors.Wrapf(err, "read %s", ba.overridePath())
		}
		if err = yaml.Unmarshal(overrideData, &override); err != nil {
			return errors.Wrapf(err, "unmarshal override YAML config")
		}

		for k := range override.Registries {
			override.Registries[k].isOverride = true
		}

		for k := range override.Environments {
			override.Environments[k].isOverride = true
		}

		if len(override.Environments) == 0 {
			override.Environments = EnvironmentSpecs{}
		}

		if len(override.Registries) == 0 {
			override.Registries = RegistryRefSpecs{}
		}

	}

	ba.overrides = &override
	ba.config = &config

	return ba.config.validate()
}

func (ba *baseApp) AddRegistry(newReg *RegistryRefSpec, isOverride bool) error {
	if err := ba.load(); err != nil {
		return errors.Wrap(err, "load configuration")
	}

190 191 192 193
	if newReg.Name == "" {
		return ErrRegistryNameInvalid
	}

bryanl's avatar
bryanl committed
194 195 196 197 198 199 200 201 202 203 204 205 206 207
	if isOverride {
		_, exists := ba.overrides.Registries[newReg.Name]
		if exists {
			return ErrRegistryExists
		}

		newReg.isOverride = true

		ba.overrides.Registries[newReg.Name] = newReg
		return ba.save()
	}

	_, exists := ba.config.Registries[newReg.Name]
	if exists {
208 209 210
		return ErrRegistryExists
	}

bryanl's avatar
bryanl committed
211 212
	newReg.isOverride = false
	ba.config.Registries[newReg.Name] = newReg
213

bryanl's avatar
bryanl committed
214
	return ba.save()
215 216 217
}

func (ba *baseApp) UpdateLib(name string, libSpec *LibraryRefSpec) error {
bryanl's avatar
bryanl committed
218 219
	if err := ba.load(); err != nil {
		return errors.Wrap(err, "load configuration")
220 221
	}

bryanl's avatar
bryanl committed
222 223
	ba.config.Libraries[name] = libSpec
	return ba.save()
224 225 226 227 228 229 230 231 232 233 234
}

func (ba *baseApp) Fs() afero.Fs {
	return ba.fs
}

func (ba *baseApp) Root() string {
	return ba.root
}

func (ba *baseApp) EnvironmentParams(envName string) (string, error) {
bryanl's avatar
bryanl committed
235 236 237
	if envName == "" {
		return "", errors.New("environment name is blank")
	}
238 239 240
	envParamsPath := filepath.Join(ba.Root(), EnvironmentDirName, envName, "params.libsonnet")
	b, err := afero.ReadFile(ba.Fs(), envParamsPath)
	if err != nil {
bryanl's avatar
bryanl committed
241
		return "", errors.Wrapf(err, "unable to read params for environment %s", envName)
242 243 244 245
	}

	return string(b), nil
}