terraform/backend/testing.go

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package backend
import (
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"reflect"
"sort"
"testing"
"github.com/hashicorp/terraform/config"
"github.com/hashicorp/terraform/state"
"github.com/hashicorp/terraform/terraform"
)
// TestBackendConfig validates and configures the backend with the
// given configuration.
func TestBackendConfig(t *testing.T, b Backend, c map[string]interface{}) Backend {
t.Helper()
// Get the proper config structure
rc, err := config.NewRawConfig(c)
if err != nil {
t.Fatalf("bad: %s", err)
}
conf := terraform.NewResourceConfig(rc)
// Validate
warns, errs := b.Validate(conf)
if len(warns) > 0 {
t.Fatalf("warnings: %s", warns)
}
if len(errs) > 0 {
t.Fatalf("errors: %s", errs)
}
// Configure
if err := b.Configure(conf); err != nil {
t.Fatalf("err: %s", err)
}
return b
}
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// TestBackend will test the functionality of a Backend. The backend is
// assumed to already be configured. This will test state functionality.
// If the backend reports it doesn't support multi-state by returning the
// error ErrNamedStatesNotSupported, then it will not test that.
//
// If you want to test locking, two backends must be given. If b2 is nil,
// then state lockign won't be tested.
func TestBackend(t *testing.T, b1, b2 Backend) {
t.Helper()
testBackendStates(t, b1)
if b2 != nil {
testBackendStateLock(t, b1, b2)
}
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}
func testBackendStates(t *testing.T, b Backend) {
t.Helper()
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states, err := b.States()
if err == ErrNamedStatesNotSupported {
t.Logf("TestBackend: named states not supported in %T, skipping", b)
return
}
// Test it starts with only the default
if len(states) != 1 || states[0] != DefaultStateName {
t.Fatalf("should only have default to start: %#v", states)
}
// Create a couple states
foo, err := b.State("foo")
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if err != nil {
t.Fatalf("error: %s", err)
}
if err := foo.RefreshState(); err != nil {
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t.Fatalf("bad: %s", err)
}
if v := foo.State(); v.HasResources() {
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t.Fatalf("should be empty: %s", v)
}
bar, err := b.State("bar")
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if err != nil {
t.Fatalf("error: %s", err)
}
if err := bar.RefreshState(); err != nil {
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t.Fatalf("bad: %s", err)
}
if v := bar.State(); v.HasResources() {
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t.Fatalf("should be empty: %s", v)
}
// Verify they are distinct states that can be read back from storage
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{
// start with a fresh state, and record the lineage being
// written to "bar"
barState := terraform.NewState()
// creating the named state may have created a lineage, so use that if it exists.
if s := bar.State(); s != nil && s.Lineage != "" {
barState.Lineage = s.Lineage
}
barLineage := barState.Lineage
// the foo lineage should be distinct from bar, and unchanged after
// modifying bar
fooState := terraform.NewState()
// creating the named state may have created a lineage, so use that if it exists.
if s := foo.State(); s != nil && s.Lineage != "" {
fooState.Lineage = s.Lineage
}
fooLineage := fooState.Lineage
// write a known state to foo
if err := foo.WriteState(fooState); err != nil {
t.Fatal("error writing foo state:", err)
}
if err := foo.PersistState(); err != nil {
t.Fatal("error persisting foo state:", err)
}
// write a distinct known state to bar
if err := bar.WriteState(barState); err != nil {
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t.Fatalf("bad: %s", err)
}
if err := bar.PersistState(); err != nil {
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t.Fatalf("bad: %s", err)
}
// verify that foo is unchanged with the existing state manager
if err := foo.RefreshState(); err != nil {
t.Fatal("error refreshing foo:", err)
}
fooState = foo.State()
switch {
case fooState == nil:
t.Fatal("nil state read from foo")
case fooState.Lineage == barLineage:
t.Fatalf("bar lineage read from foo: %#v", fooState)
case fooState.Lineage != fooLineage:
t.Fatal("foo lineage alterred")
}
// fetch foo again from the backend
foo, err = b.State("foo")
if err != nil {
t.Fatal("error re-fetching state:", err)
}
if err := foo.RefreshState(); err != nil {
t.Fatal("error refreshing foo:", err)
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}
fooState = foo.State()
switch {
case fooState == nil:
t.Fatal("nil state read from foo")
case fooState.Lineage != fooLineage:
t.Fatal("incorrect state returned from backend")
}
// fetch the bar again from the backend
bar, err = b.State("bar")
if err != nil {
t.Fatal("error re-fetching state:", err)
}
if err := bar.RefreshState(); err != nil {
t.Fatal("error refreshing bar:", err)
}
barState = bar.State()
switch {
case barState == nil:
t.Fatal("nil state read from bar")
case barState.Lineage != barLineage:
t.Fatal("incorrect state returned from backend")
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}
}
// Verify we can now list them
{
// we determined that named stated are supported earlier
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states, err := b.States()
if err != nil {
t.Fatal(err)
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}
sort.Strings(states)
expected := []string{"bar", "default", "foo"}
if !reflect.DeepEqual(states, expected) {
t.Fatalf("bad: %#v", states)
}
}
// Delete some states
if err := b.DeleteState("foo"); err != nil {
t.Fatalf("err: %s", err)
}
// Verify the default state can't be deleted
if err := b.DeleteState(DefaultStateName); err == nil {
t.Fatal("expected error")
}
// Create and delete the foo state again.
// Make sure that there are no leftover artifacts from a deleted state
// preventing re-creation.
foo, err = b.State("foo")
if err != nil {
t.Fatalf("error: %s", err)
}
if err := foo.RefreshState(); err != nil {
t.Fatalf("bad: %s", err)
}
if v := foo.State(); v.HasResources() {
t.Fatalf("should be empty: %s", v)
}
// and delete it again
if err := b.DeleteState("foo"); err != nil {
t.Fatalf("err: %s", err)
}
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// Verify deletion
{
states, err := b.States()
if err == ErrNamedStatesNotSupported {
t.Logf("TestBackend: named states not supported in %T, skipping", b)
return
}
sort.Strings(states)
expected := []string{"bar", "default"}
if !reflect.DeepEqual(states, expected) {
t.Fatalf("bad: %#v", states)
}
}
}
func testBackendStateLock(t *testing.T, b1, b2 Backend) {
t.Helper()
// Get the default state for each
b1StateMgr, err := b1.State(DefaultStateName)
if err != nil {
t.Fatalf("error: %s", err)
}
if err := b1StateMgr.RefreshState(); err != nil {
t.Fatalf("bad: %s", err)
}
// Fast exit if this doesn't support locking at all
if _, ok := b1StateMgr.(state.Locker); !ok {
t.Logf("TestBackend: backend %T doesn't support state locking, not testing", b1)
return
}
t.Logf("TestBackend: testing state locking for %T", b1)
b2StateMgr, err := b2.State(DefaultStateName)
if err != nil {
t.Fatalf("error: %s", err)
}
if err := b2StateMgr.RefreshState(); err != nil {
t.Fatalf("bad: %s", err)
}
// Reassign so its obvious whats happening
lockerA := b1StateMgr.(state.Locker)
lockerB := b2StateMgr.(state.Locker)
infoA := state.NewLockInfo()
infoA.Operation = "test"
infoA.Who = "clientA"
infoB := state.NewLockInfo()
infoB.Operation = "test"
infoB.Who = "clientB"
lockIDA, err := lockerA.Lock(infoA)
if err != nil {
t.Fatal("unable to get initial lock:", err)
}
// If the lock ID is blank, assume locking is disabled
if lockIDA == "" {
t.Logf("TestBackend: %T: empty string returned for lock, assuming disabled", b1)
return
}
_, err = lockerB.Lock(infoB)
if err == nil {
lockerA.Unlock(lockIDA)
t.Fatal("client B obtained lock while held by client A")
}
if err := lockerA.Unlock(lockIDA); err != nil {
t.Fatal("error unlocking client A", err)
}
lockIDB, err := lockerB.Lock(infoB)
if err != nil {
t.Fatal("unable to obtain lock from client B")
}
if lockIDB == lockIDA {
t.Fatalf("duplicate lock IDs: %q", lockIDB)
}
if err = lockerB.Unlock(lockIDB); err != nil {
t.Fatal("error unlocking client B:", err)
}
}