terraform/backend/testing.go

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package backend
import (
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"reflect"
"sort"
"testing"
uuid "github.com/hashicorp/go-uuid"
"github.com/hashicorp/hcl2/hcl"
"github.com/hashicorp/hcl2/hcldec"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/config/hcl2shim"
"github.com/hashicorp/terraform/configs"
"github.com/hashicorp/terraform/state"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/terraform/states/statemgr"
"github.com/hashicorp/terraform/tfdiags"
)
// TestBackendConfig validates and configures the backend with the
// given configuration.
func TestBackendConfig(t *testing.T, b Backend, c hcl.Body) Backend {
t.Helper()
t.Logf("TestBackendConfig on %T with %#v", b, c)
var diags tfdiags.Diagnostics
schema := b.ConfigSchema()
spec := schema.DecoderSpec()
obj, decDiags := hcldec.Decode(c, spec, nil)
diags = diags.Append(decDiags)
valDiags := b.ValidateConfig(obj)
diags = diags.Append(valDiags.InConfigBody(c))
if len(diags) != 0 {
t.Fatal(diags)
}
confDiags := b.Configure(obj)
if len(confDiags) != 0 {
confDiags = confDiags.InConfigBody(c)
t.Fatal(confDiags)
}
return b
}
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// TestWrapConfig takes a raw data structure and converts it into a
// synthetic hcl.Body to use for testing.
//
// The given structure should only include values that can be accepted by
// hcl2shim.HCL2ValueFromConfigValue. If incompatible values are given,
// this function will panic.
func TestWrapConfig(raw map[string]interface{}) hcl.Body {
obj := hcl2shim.HCL2ValueFromConfigValue(raw)
return configs.SynthBody("<TestWrapConfig>", obj.AsValueMap())
}
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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.
func TestBackendStates(t *testing.T, b Backend) {
t.Helper()
workspaces, err := b.Workspaces()
if err == ErrNamedStatesNotSupported {
t.Logf("TestBackend: workspaces not supported in %T, skipping", b)
return
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}
// Test it starts with only the default
if len(workspaces) != 1 || workspaces[0] != DefaultStateName {
t.Fatalf("should only have default to start: %#v", workspaces)
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}
// Create a couple states
foo, err := b.StateMgr("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.StateMgr("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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{
// We'll use two distinct states here and verify that changing one
// does not also change the other.
barState := states.NewState()
fooState := states.NewState()
// 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)
}
// We'll make "bar" different by adding a fake resource state to it.
barState.SyncWrapper().SetResourceInstanceCurrent(
addrs.ResourceInstance{
Resource: addrs.Resource{
Mode: addrs.ManagedResourceMode,
Type: "test_thing",
Name: "foo",
},
}.Absolute(addrs.RootModuleInstance),
&states.ResourceInstanceObjectSrc{
AttrsJSON: []byte("{}"),
Status: states.ObjectReady,
SchemaVersion: 0,
},
addrs.ProviderConfig{
Type: "test",
}.Absolute(addrs.RootModuleInstance),
)
// 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()
if fooState.HasResources() {
t.Fatal("after writing a resource to bar, foo now has resources too")
}
// fetch foo again from the backend
foo, err = b.StateMgr("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()
if fooState.HasResources() {
t.Fatal("after writing a resource to bar and re-reading foo, foo now has resources too")
}
// fetch the bar again from the backend
bar, err = b.StateMgr("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()
if !barState.HasResources() {
t.Fatal("after writing a resource instance object to bar and re-reading it, the object has vanished")
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}
}
// Verify we can now list them
{
// we determined that named stated are supported earlier
workspaces, err := b.Workspaces()
if err != nil {
t.Fatal(err)
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}
sort.Strings(workspaces)
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expected := []string{"bar", "default", "foo"}
if !reflect.DeepEqual(workspaces, expected) {
t.Fatalf("wrong workspaces list\ngot: %#v\nwant: %#v", workspaces, expected)
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}
}
// Delete some workspaces
if err := b.DeleteWorkspace("foo"); err != nil {
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t.Fatalf("err: %s", err)
}
// Verify the default state can't be deleted
if err := b.DeleteWorkspace(DefaultStateName); err == nil {
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t.Fatal("expected error")
}
// Create and delete the foo workspace again.
// Make sure that there are no leftover artifacts from a deleted state
// preventing re-creation.
foo, err = b.StateMgr("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.DeleteWorkspace("foo"); err != nil {
t.Fatalf("err: %s", err)
}
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// Verify deletion
{
states, err := b.Workspaces()
if err == ErrWorkspacesNotSupported {
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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)
}
}
}
// TestBackendStateLocks will test the locking functionality of the remote
// state backend.
func TestBackendStateLocks(t *testing.T, b1, b2 Backend) {
t.Helper()
testLocks(t, b1, b2, false)
}
// TestBackendStateForceUnlock verifies that the lock error is the expected
// type, and the lock can be unlocked using the ID reported in the error.
// Remote state backends that support -force-unlock should call this in at
// least one of the acceptance tests.
func TestBackendStateForceUnlock(t *testing.T, b1, b2 Backend) {
t.Helper()
testLocks(t, b1, b2, true)
}
func testLocks(t *testing.T, b1, b2 Backend, testForceUnlock bool) {
t.Helper()
// Get the default state for each
b1StateMgr, err := b1.StateMgr(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.StateMgr(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)
}
// Make sure we can still get the state.State from another instance even
// when locked. This should only happen when a state is loaded via the
// backend, and as a remote state.
_, err = b2.StateMgr(DefaultStateName)
if err != nil {
t.Errorf("failed to read locked state from another backend instance: %s", 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.Errorf("duplicate lock IDs: %q", lockIDB)
}
if err = lockerB.Unlock(lockIDB); err != nil {
t.Fatal("error unlocking client B:", err)
}
// test the equivalent of -force-unlock, by using the id from the error
// output.
if !testForceUnlock {
return
}
// get a new ID
infoA.ID, err = uuid.GenerateUUID()
if err != nil {
panic(err)
}
lockIDA, err = lockerA.Lock(infoA)
if err != nil {
t.Fatal("unable to get re lock A:", err)
}
unlock := func() {
err := lockerA.Unlock(lockIDA)
if err != nil {
t.Fatal(err)
}
}
_, err = lockerB.Lock(infoB)
if err == nil {
unlock()
t.Fatal("client B obtained lock while held by client A")
}
infoErr, ok := err.(*statemgr.LockError)
if !ok {
unlock()
t.Fatalf("expected type *statemgr.LockError, got : %#v", err)
}
// try to unlock with the second unlocker, using the ID from the error
if err := lockerB.Unlock(infoErr.Info.ID); err != nil {
unlock()
t.Fatalf("could not unlock with the reported ID %q: %s", infoErr.Info.ID, err)
}
}