terraform/backend/atlas/state_client_test.go

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package atlas
import (
"bytes"
"context"
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"crypto/md5"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
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"net/http"
"net/http/httptest"
"net/url"
"os"
"testing"
"time"
"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/configs"
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"github.com/hashicorp/terraform/helper/acctest"
"github.com/hashicorp/terraform/state/remote"
"github.com/hashicorp/terraform/terraform"
)
func testStateClient(t *testing.T, c map[string]string) remote.Client {
vals := make(map[string]cty.Value)
for k, s := range c {
vals[k] = cty.StringVal(s)
}
synthBody := configs.SynthBody("<test>", vals)
b := backend.TestBackendConfig(t, New(), synthBody)
raw, err := b.StateMgr(backend.DefaultStateName)
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if err != nil {
t.Fatalf("err: %s", err)
}
s := raw.(*remote.State)
return s.Client
}
func TestStateClient_impl(t *testing.T) {
var _ remote.Client = new(stateClient)
}
func TestStateClient(t *testing.T) {
acctest.RemoteTestPrecheck(t)
token := os.Getenv("ATLAS_TOKEN")
if token == "" {
t.Skipf("skipping, ATLAS_TOKEN must be set")
}
client := testStateClient(t, map[string]string{
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"access_token": token,
"name": "hashicorp/test-remote-state",
})
remote.TestClient(t, client)
}
func TestStateClient_noRetryOnBadCerts(t *testing.T) {
acctest.RemoteTestPrecheck(t)
client := testStateClient(t, map[string]string{
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"access_token": "NOT_REQUIRED",
"name": "hashicorp/test-remote-state",
})
ac := client.(*stateClient)
// trigger the StateClient to build the http client and assign HTTPClient
httpClient, err := ac.http()
if err != nil {
t.Fatal(err)
}
// remove the CA certs from the client
brokenCfg := &tls.Config{
RootCAs: new(x509.CertPool),
}
httpClient.HTTPClient.Transport.(*http.Transport).TLSClientConfig = brokenCfg
// Instrument CheckRetry to make sure we didn't retry
retries := 0
oldCheck := httpClient.CheckRetry
httpClient.CheckRetry = func(ctx context.Context, resp *http.Response, err error) (bool, error) {
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if retries > 0 {
t.Fatal("retried after certificate error")
}
retries++
return oldCheck(ctx, resp, err)
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}
_, err = client.Get()
if err != nil {
if err, ok := err.(*url.Error); ok {
if _, ok := err.Err.(x509.UnknownAuthorityError); ok {
return
}
}
}
t.Fatalf("expected x509.UnknownAuthorityError, got %v", err)
}
func TestStateClient_ReportedConflictEqualStates(t *testing.T) {
fakeAtlas := newFakeAtlas(t, testStateModuleOrderChange)
srv := fakeAtlas.Server()
defer srv.Close()
client := testStateClient(t, map[string]string{
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"access_token": "sometoken",
"name": "someuser/some-test-remote-state",
"address": srv.URL,
})
state, err := terraform.ReadState(bytes.NewReader(testStateModuleOrderChange))
if err != nil {
t.Fatalf("err: %s", err)
}
var stateJson bytes.Buffer
if err := terraform.WriteState(state, &stateJson); err != nil {
t.Fatalf("err: %s", err)
}
if err := client.Put(stateJson.Bytes()); err != nil {
t.Fatalf("err: %s", err)
}
}
func TestStateClient_NoConflict(t *testing.T) {
fakeAtlas := newFakeAtlas(t, testStateSimple)
srv := fakeAtlas.Server()
defer srv.Close()
client := testStateClient(t, map[string]string{
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"access_token": "sometoken",
"name": "someuser/some-test-remote-state",
"address": srv.URL,
})
state, err := terraform.ReadState(bytes.NewReader(testStateSimple))
if err != nil {
t.Fatalf("err: %s", err)
}
fakeAtlas.NoConflictAllowed(true)
var stateJson bytes.Buffer
if err := terraform.WriteState(state, &stateJson); err != nil {
t.Fatalf("err: %s", err)
}
if err := client.Put(stateJson.Bytes()); err != nil {
t.Fatalf("err: %s", err)
}
}
func TestStateClient_LegitimateConflict(t *testing.T) {
fakeAtlas := newFakeAtlas(t, testStateSimple)
srv := fakeAtlas.Server()
defer srv.Close()
client := testStateClient(t, map[string]string{
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"access_token": "sometoken",
"name": "someuser/some-test-remote-state",
"address": srv.URL,
})
state, err := terraform.ReadState(bytes.NewReader(testStateSimple))
if err != nil {
t.Fatalf("err: %s", err)
}
var buf bytes.Buffer
terraform.WriteState(state, &buf)
// Changing the state but not the serial. Should generate a conflict.
state.RootModule().Outputs["drift"] = &terraform.OutputState{
Type: "string",
Sensitive: false,
Value: "happens",
}
var stateJson bytes.Buffer
if err := terraform.WriteState(state, &stateJson); err != nil {
t.Fatalf("err: %s", err)
}
if err := client.Put(stateJson.Bytes()); err == nil {
t.Fatal("Expected error from state conflict, got none.")
}
}
func TestStateClient_UnresolvableConflict(t *testing.T) {
fakeAtlas := newFakeAtlas(t, testStateSimple)
// Something unexpected causes Atlas to conflict in a way that we can't fix.
fakeAtlas.AlwaysConflict(true)
srv := fakeAtlas.Server()
defer srv.Close()
client := testStateClient(t, map[string]string{
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"access_token": "sometoken",
"name": "someuser/some-test-remote-state",
"address": srv.URL,
})
state, err := terraform.ReadState(bytes.NewReader(testStateSimple))
if err != nil {
t.Fatalf("err: %s", err)
}
var stateJson bytes.Buffer
if err := terraform.WriteState(state, &stateJson); err != nil {
t.Fatalf("err: %s", err)
}
errCh := make(chan error)
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go func() {
defer close(errCh)
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if err := client.Put(stateJson.Bytes()); err == nil {
errCh <- errors.New("expected error from state conflict, got none.")
return
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}
}()
select {
case err := <-errCh:
if err != nil {
t.Fatalf("error from anonymous test goroutine: %s", err)
}
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case <-time.After(500 * time.Millisecond):
t.Fatalf("Timed out after 500ms, probably because retrying infinitely.")
}
}
// Stub Atlas HTTP API for a given state JSON string; does checksum-based
// conflict detection equivalent to Atlas's.
type fakeAtlas struct {
state []byte
t *testing.T
// Used to test that we only do the special conflict handling retry once.
alwaysConflict bool
// Used to fail the test immediately if a conflict happens.
noConflictAllowed bool
}
func newFakeAtlas(t *testing.T, state []byte) *fakeAtlas {
return &fakeAtlas{
state: state,
t: t,
}
}
func (f *fakeAtlas) Server() *httptest.Server {
return httptest.NewServer(http.HandlerFunc(f.handler))
}
func (f *fakeAtlas) CurrentState() *terraform.State {
// we read the state manually here, because terraform may alter state
// during read
currentState := &terraform.State{}
err := json.Unmarshal(f.state, currentState)
if err != nil {
f.t.Fatalf("err: %s", err)
}
return currentState
}
func (f *fakeAtlas) CurrentSerial() int64 {
return f.CurrentState().Serial
}
func (f *fakeAtlas) CurrentSum() [md5.Size]byte {
return md5.Sum(f.state)
}
func (f *fakeAtlas) AlwaysConflict(b bool) {
f.alwaysConflict = b
}
func (f *fakeAtlas) NoConflictAllowed(b bool) {
f.noConflictAllowed = b
}
func (f *fakeAtlas) handler(resp http.ResponseWriter, req *http.Request) {
// access tokens should only be sent as a header
if req.FormValue("access_token") != "" {
http.Error(resp, "access_token in request params", http.StatusBadRequest)
return
}
if req.Header.Get(atlasTokenHeader) == "" {
http.Error(resp, "missing access token", http.StatusBadRequest)
return
}
switch req.Method {
case "GET":
// Respond with the current stored state.
resp.Header().Set("Content-Type", "application/json")
resp.Write(f.state)
case "PUT":
var buf bytes.Buffer
buf.ReadFrom(req.Body)
sum := md5.Sum(buf.Bytes())
// we read the state manually here, because terraform may alter state
// during read
state := &terraform.State{}
err := json.Unmarshal(buf.Bytes(), state)
if err != nil {
f.t.Fatalf("err: %s", err)
}
conflict := f.CurrentSerial() == state.Serial && f.CurrentSum() != sum
conflict = conflict || f.alwaysConflict
if conflict {
if f.noConflictAllowed {
f.t.Fatal("Got conflict when NoConflictAllowed was set.")
}
http.Error(resp, "Conflict", 409)
} else {
f.state = buf.Bytes()
resp.WriteHeader(200)
}
}
}
// This is a tfstate file with the module order changed, which is a structural
// but not a semantic difference. Terraform will sort these modules as it
// loads the state.
var testStateModuleOrderChange = []byte(
`{
"version": 3,
"serial": 1,
"modules": [
{
"path": [
"root",
"child2",
"grandchild"
],
"outputs": {
"foo": {
"sensitive": false,
"type": "string",
"value": "bar"
}
},
"resources": null
},
{
"path": [
"root",
"child1",
"grandchild"
],
"outputs": {
"foo": {
"sensitive": false,
"type": "string",
"value": "bar"
}
},
"resources": null
}
]
}
`)
var testStateSimple = []byte(
`{
"version": 3,
"serial": 2,
"lineage": "c00ad9ac-9b35-42fe-846e-b06f0ef877e9",
"modules": [
{
"path": [
"root"
],
"outputs": {
"foo": {
"sensitive": false,
"type": "string",
"value": "bar"
}
},
"resources": {},
"depends_on": []
}
]
}
`)