constellation/cli/internal/terraform/terraform_test.go

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/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package terraform
import (
"context"
"errors"
"io/fs"
"path/filepath"
"testing"
"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
"github.com/edgelesssys/constellation/v2/internal/constants"
"github.com/edgelesssys/constellation/v2/internal/file"
"github.com/hashicorp/terraform-exec/tfexec"
tfjson "github.com/hashicorp/terraform-json"
"github.com/spf13/afero"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.uber.org/multierr"
)
func TestPrepareCluster(t *testing.T) {
qemuVars := &QEMUVariables{
CommonVariables: CommonVariables{
Name: "name",
CountControlPlanes: 1,
CountWorkers: 2,
StateDiskSizeGB: 11,
},
CPUCount: 1,
MemorySizeMiB: 1024,
ImagePath: "path",
ImageFormat: "format",
MetadataAPIImage: "api",
}
testCases := map[string]struct {
provider cloudprovider.Provider
vars Variables
fs afero.Fs
partiallyExtracted bool
wantErr bool
}{
"qemu": {
provider: cloudprovider.QEMU,
vars: qemuVars,
fs: afero.NewMemMapFs(),
wantErr: false,
},
"no vars": {
provider: cloudprovider.QEMU,
fs: afero.NewMemMapFs(),
wantErr: true,
},
"continue on partially extracted": {
provider: cloudprovider.QEMU,
vars: qemuVars,
fs: afero.NewMemMapFs(),
partiallyExtracted: true,
wantErr: false,
},
"prepare workspace fails": {
provider: cloudprovider.QEMU,
vars: qemuVars,
fs: afero.NewReadOnlyFs(afero.NewMemMapFs()),
wantErr: true,
},
}
for name, tc := range testCases {
t.Run(name, func(t *testing.T) {
assert := assert.New(t)
require := require.New(t)
c := &Client{
tf: &stubTerraform{},
file: file.NewHandler(tc.fs),
workingDir: constants.TerraformWorkingDir,
}
err := c.PrepareWorkspace(tc.provider, tc.vars)
// Test case: Check if we can continue to create on an incomplete workspace.
if tc.partiallyExtracted {
require.NoError(c.file.Remove(filepath.Join(c.workingDir, "main.tf")))
err = c.PrepareWorkspace(tc.provider, tc.vars)
}
if tc.wantErr {
assert.Error(err)
return
}
assert.NoError(err)
})
}
}
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func TestCreateCluster(t *testing.T) {
someErr := errors.New("failed")
newTestState := func() *tfjson.State {
workingState := tfjson.State{
Values: &tfjson.StateValues{
Outputs: map[string]*tfjson.StateOutput{
"ip": {
Value: "192.0.2.100",
},
},
},
}
return &workingState
}
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qemuVars := &QEMUVariables{
CommonVariables: CommonVariables{
Name: "name",
CountControlPlanes: 1,
CountWorkers: 2,
StateDiskSizeGB: 11,
},
CPUCount: 1,
MemorySizeMiB: 1024,
ImagePath: "path",
ImageFormat: "format",
MetadataAPIImage: "api",
}
testCases := map[string]struct {
provider cloudprovider.Provider
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vars Variables
tf *stubTerraform
fs afero.Fs
wantErr bool
}{
"works": {
provider: cloudprovider.QEMU,
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vars: qemuVars,
tf: &stubTerraform{showState: newTestState()},
fs: afero.NewMemMapFs(),
},
"init fails": {
provider: cloudprovider.QEMU,
vars: qemuVars,
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tf: &stubTerraform{initErr: someErr},
fs: afero.NewMemMapFs(),
wantErr: true,
},
"apply fails": {
provider: cloudprovider.QEMU,
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vars: qemuVars,
tf: &stubTerraform{applyErr: someErr},
fs: afero.NewMemMapFs(),
wantErr: true,
},
"show fails": {
provider: cloudprovider.QEMU,
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vars: qemuVars,
tf: &stubTerraform{showErr: someErr},
fs: afero.NewMemMapFs(),
wantErr: true,
},
"no ip": {
provider: cloudprovider.QEMU,
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vars: qemuVars,
tf: &stubTerraform{
showState: &tfjson.State{
Values: &tfjson.StateValues{
Outputs: map[string]*tfjson.StateOutput{},
},
},
},
fs: afero.NewMemMapFs(),
wantErr: true,
},
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"ip has wrong type": {
provider: cloudprovider.QEMU,
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vars: qemuVars,
tf: &stubTerraform{
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showState: &tfjson.State{
Values: &tfjson.StateValues{
Outputs: map[string]*tfjson.StateOutput{"ip": {Value: 42}},
},
},
},
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fs: afero.NewMemMapFs(),
wantErr: true,
},
}
for name, tc := range testCases {
t.Run(name, func(t *testing.T) {
assert := assert.New(t)
require := require.New(t)
c := &Client{
tf: tc.tf,
file: file.NewHandler(tc.fs),
workingDir: constants.TerraformWorkingDir,
}
require.NoError(c.PrepareWorkspace(tc.provider, tc.vars))
ip, err := c.CreateCluster(context.Background())
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if tc.wantErr {
assert.Error(err)
return
}
assert.NoError(err)
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assert.Equal("192.0.2.100", ip)
})
}
}
func TestDestroyInstances(t *testing.T) {
testCases := map[string]struct {
tf *stubTerraform
wantErr bool
}{
"works": {
tf: &stubTerraform{},
},
"destroy fails": {
tf: &stubTerraform{
destroyErr: errors.New("error"),
},
wantErr: true,
},
}
for name, tc := range testCases {
t.Run(name, func(t *testing.T) {
assert := assert.New(t)
c := &Client{
tf: tc.tf,
}
err := c.DestroyCluster(context.Background())
if tc.wantErr {
assert.Error(err)
return
}
assert.NoError(err)
})
}
}
func TestCleanupWorkspace(t *testing.T) {
someContent := []byte("some content")
testCases := map[string]struct {
provider cloudprovider.Provider
prepareFS func(file.Handler) error
wantErr bool
}{
"files are cleaned up": {
provider: cloudprovider.QEMU,
prepareFS: func(f file.Handler) error {
var err error
err = multierr.Append(err, f.Write("terraform.tfvars", someContent))
err = multierr.Append(err, f.Write("terraform.tfstate", someContent))
return multierr.Append(err, f.Write("terraform.tfstate.backup", someContent))
},
},
"no error if files do not exist": {
provider: cloudprovider.QEMU,
prepareFS: func(f file.Handler) error { return nil },
},
}
for name, tc := range testCases {
t.Run(name, func(t *testing.T) {
assert := assert.New(t)
require := require.New(t)
file := file.NewHandler(afero.NewMemMapFs())
require.NoError(tc.prepareFS(file))
c := &Client{
file: file,
tf: &stubTerraform{},
workingDir: constants.TerraformWorkingDir,
}
err := c.CleanUpWorkspace()
if tc.wantErr {
assert.Error(err)
return
}
assert.NoError(err)
_, err = file.Stat(filepath.Join(c.workingDir, "terraform.tfvars"))
assert.ErrorIs(err, fs.ErrNotExist)
_, err = file.Stat(filepath.Join(c.workingDir, "terraform.tfstate"))
assert.ErrorIs(err, fs.ErrNotExist)
_, err = file.Stat(filepath.Join(c.workingDir, "terraform.tfstate.backup"))
assert.ErrorIs(err, fs.ErrNotExist)
})
}
}
type stubTerraform struct {
applyErr error
destroyErr error
initErr error
showErr error
showState *tfjson.State
}
func (s *stubTerraform) Apply(context.Context, ...tfexec.ApplyOption) error {
return s.applyErr
}
func (s *stubTerraform) Destroy(context.Context, ...tfexec.DestroyOption) error {
return s.destroyErr
}
func (s *stubTerraform) Init(context.Context, ...tfexec.InitOption) error {
return s.initErr
}
func (s *stubTerraform) Show(context.Context, ...tfexec.ShowOption) (*tfjson.State, error) {
return s.showState, s.showErr
}