// Initialize REST handlers. Call this once on launch.
func InitREST(bucket *couchbase.Bucket, dbName string, serverURL string) *context {
	if dbName == "" {
		dbName = bucket.Name
	}

	dbcontext, err := db.NewDatabaseContext(dbName, bucket)
	if err != nil {
		return nil
	}
	newdb, err := db.GetDatabase(dbcontext, nil)
	if err != nil {
		return nil
	}
	newdb.ReadDesignDocument()

	if dbcontext.ChannelMapper == nil {
		log.Printf("Channel mapper undefined; using default")
		// Always have a channel mapper object even if it does nothing:
		dbcontext.ChannelMapper, _ = channels.NewDefaultChannelMapper()
	}
	if dbcontext.Validator == nil {
		log.Printf("Validator undefined; no validation")
	}

	c := &context{
		dbcontext: dbcontext,
		auth:      auth.NewAuthenticator(bucket),
		serverURL: serverURL,
	}

	http.Handle("/", createHandler(c))
	return c
}

func TestInvalidChannel(t *testing.T) {
	db := setupTestDB(t)
	defer tearDownTestDB(t, db)

	db.ChannelMapper = channels.NewDefaultChannelMapper()

	body := Body{"channels": []string{"bad name"}}
	_, err := db.Put("doc", body)
	assertHTTPError(t, err, 500)
}

// Unit test for bug #314
func TestChangesAfterChannelAdded(t *testing.T) {
	base.LogKeys["Cache"] = true
	base.LogKeys["Changes"] = true
	base.LogKeys["Changes+"] = true
	db := setupTestDB(t)
	defer tearDownTestDB(t, db)
	db.ChannelMapper = channels.NewDefaultChannelMapper()

	// Create a user with access to channel ABC
	authenticator := db.Authenticator()
	user, _ := authenticator.NewUser("naomi", "letmein", channels.SetOf("ABC"))
	authenticator.Save(user)

	// Create a doc on two channels (sequence 1):
	revid, _ := db.Put("doc1", Body{"channels": []string{"ABC", "PBS"}})

	// Modify user to have access to both channels (sequence 2):
	userInfo, err := db.GetPrincipal("naomi", true)
	assert.True(t, userInfo != nil)
	userInfo.ExplicitChannels = base.SetOf("ABC", "PBS")
	_, err = db.UpdatePrincipal(*userInfo, true, true)
	assertNoError(t, err, "UpdatePrincipal failed")

	// Check the _changes feed:
	db.changeCache.waitForSequence(1)
	db.user, _ = authenticator.GetUser("naomi")
	changes, err := db.GetChanges(base.SetOf("*"), ChangesOptions{Since: SequenceID{Seq: 1}})
	assertNoError(t, err, "Couldn't GetChanges")

	assert.Equals(t, len(changes), 2)
	assert.DeepEquals(t, changes[0], &ChangeEntry{
		Seq:     SequenceID{Seq: 1, TriggeredBy: 2},
		ID:      "doc1",
		Changes: []ChangeRev{{"rev": revid}}})
	assert.DeepEquals(t, changes[1], &ChangeEntry{
		Seq:     SequenceID{Seq: 2},
		ID:      "_user/naomi",
		Changes: []ChangeRev{}})

	// Add a new doc (sequence 3):
	revid, _ = db.Put("doc2", Body{"channels": []string{"PBS"}})

	// Check the _changes feed -- this is to make sure the changeCache properly received
	// sequence 2 (the user doc) and isn't stuck waiting for it.
	db.changeCache.waitForSequence(3)
	changes, err = db.GetChanges(base.SetOf("*"), ChangesOptions{Since: SequenceID{Seq: 2}})
	assertNoError(t, err, "Couldn't GetChanges (2nd)")

	assert.Equals(t, len(changes), 1)
	assert.DeepEquals(t, changes[0], &ChangeEntry{
		Seq:     SequenceID{Seq: 3},
		ID:      "doc2",
		Changes: []ChangeRev{{"rev": revid}}})
}

// Adds a database to the serverContext given its Bucket.
func (sc *serverContext) addDatabase(bucket base.Bucket, dbName string, syncFun *string, nag bool) (*context, error) {
	if dbName == "" {
		dbName = bucket.GetName()
	}

	if match, _ := regexp.MatchString(`^[a-z][-a-z0-9_$()+/]*$`, dbName); !match {
		return nil, fmt.Errorf("Illegal database name: %s", dbName)
	}

	if sc.databases[dbName] != nil {
		return nil, fmt.Errorf("Duplicate database name %q", dbName)
	}

	dbcontext, err := db.NewDatabaseContext(dbName, bucket)
	if err != nil {
		return nil, err
	}
	if syncFun != nil {
		if err := dbcontext.ApplySyncFun(*syncFun); err != nil {
			return nil, err
		}
	}

	if dbcontext.ChannelMapper == nil {
		if nag {
			base.Warn("Sync function undefined; using default")
		}
		// Always have a channel mapper object even if it does nothing:
		dbcontext.ChannelMapper, _ = channels.NewDefaultChannelMapper()
	}

	c := &context{
		dbcontext: dbcontext,
		auth:      dbcontext.Authenticator(),
	}

	sc.databases[dbName] = c
	return c, nil
}

func TestConflicts(t *testing.T) {
	AlwaysCompactChangeLog = true // Makes examining the change log deterministic
	defer func() { AlwaysCompactChangeLog = false }()

	db := setupTestDB(t)
	defer tearDownTestDB(t, db)
	db.ChannelMapper = channels.NewDefaultChannelMapper()

	// base.LogKeys["CRUD"] = true
	// base.LogKeys["Changes"] = true

	// Create rev 1 of "doc":
	body := Body{"n": 1, "channels": []string{"all", "1"}}
	assertNoError(t, db.PutExistingRev("doc", body, []string{"1-a"}), "add 1-a")

	log, _ := db.GetChangeLog("all", 0)
	assert.Equals(t, len(log.Entries), 1)
	assert.Equals(t, int(log.Since), 0)

	// Create two conflicting changes:
	body["n"] = 2
	body["channels"] = []string{"all", "2b"}
	assertNoError(t, db.PutExistingRev("doc", body, []string{"2-b", "1-a"}), "add 2-b")
	body["n"] = 3
	body["channels"] = []string{"all", "2a"}
	assertNoError(t, db.PutExistingRev("doc", body, []string{"2-a", "1-a"}), "add 2-a")

	// Verify the change with the higher revid won:
	gotBody, err := db.Get("doc")
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "2-b", "n": int64(2),
		"channels": []interface{}{"all", "2b"}})

	// Verify we can still get the other two revisions:
	gotBody, err = db.GetRev("doc", "1-a", false, nil)
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "1-a", "n": int64(1),
		"channels": []interface{}{"all", "1"}})
	gotBody, err = db.GetRev("doc", "2-a", false, nil)
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "2-a", "n": int64(3),
		"channels": []interface{}{"all", "2a"}})

	// Verify the change-log of the "all" channel:
	log, _ = db.GetChangeLog("all", 0)
	assert.Equals(t, len(log.Entries), 3)
	assert.Equals(t, int(log.Since), 0)
	assert.DeepEquals(t, log.Entries[0], &channels.LogEntry{Sequence: 1})
	assert.DeepEquals(t, log.Entries[1], &channels.LogEntry{Sequence: 2, DocID: "doc", RevID: "2-b"})
	assert.DeepEquals(t, log.Entries[2], &channels.LogEntry{Sequence: 3, DocID: "doc", RevID: "2-a", Flags: channels.Hidden})

	// Verify the _changes feed:
	changes, err := db.GetChanges(channels.SetOf("all"), ChangesOptions{Conflicts: true})
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 2)
	// (CouchDB would merge these into one entry, but the gateway doesn't.)
	assert.DeepEquals(t, changes[0], &ChangeEntry{
		Seq:     "all:2",
		ID:      "doc",
		Changes: []ChangeRev{{"rev": "2-b"}}})
	assert.DeepEquals(t, changes[1], &ChangeEntry{
		Seq:     "all:3",
		ID:      "doc",
		Changes: []ChangeRev{{"rev": "2-a"}}})

	changes, err = db.GetChanges(channels.SetOf("all"), ChangesOptions{Conflicts: false})
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 1)
	assert.DeepEquals(t, changes[0], &ChangeEntry{
		Seq:     "all:2",
		ID:      "doc",
		Changes: []ChangeRev{{"rev": "2-b"}}})

	// Delete 2-b; verify this makes 2-a current:
	_, err = db.DeleteDoc("doc", "2-b")
	assertNoError(t, err, "delete 2-b")
	gotBody, err = db.Get("doc")
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "2-a", "n": int64(3),
		"channels": []interface{}{"all", "2a"}})

	// Verify channel assignments are correct for channels defined by 2-a:
	doc, _ := db.getDoc("doc")
	chan2a, found := doc.Channels["2a"]
	assert.True(t, found)
	assert.True(t, chan2a == nil)             // currently in 2a
	assert.True(t, doc.Channels["2b"] != nil) // has been removed from 2b
}

func TestAllDocs(t *testing.T) {
	AlwaysCompactChangeLog = true // Makes examining the change log deterministic
	defer func() { AlwaysCompactChangeLog = false }()

	db := setupTestDB(t)
	defer tearDownTestDB(t, db)

	// Lower the log capacity to 50 to ensure the test will overflow, causing logs to be truncated,
	// so the changes feed will have to backfill from its view.
	oldMaxLogLength := MaxChangeLogLength
	MaxChangeLogLength = 50
	defer func() { MaxChangeLogLength = oldMaxLogLength }()

	base.LogKeys["Changes"] = true
	defer func() { base.LogKeys["Changes"] = false }()

	db.ChannelMapper = channels.NewDefaultChannelMapper()

	ids := make([]IDAndRev, 100)
	for i := 0; i < 100; i++ {
		channels := []string{"all"}
		if i%10 == 0 {
			channels = append(channels, "KFJC")
		}
		body := Body{"serialnumber": i, "channels": channels}
		ids[i].DocID = fmt.Sprintf("alldoc-%02d", i)
		revid, err := db.Put(ids[i].DocID, body)
		ids[i].RevID = revid
		assertNoError(t, err, "Couldn't create document")
	}

	alldocs, err := db.AllDocIDs()
	assertNoError(t, err, "AllDocIDs failed")
	assert.Equals(t, len(alldocs), 100)
	for i, entry := range alldocs {
		assert.DeepEquals(t, entry, ids[i])
	}

	// Now delete one document and try again:
	_, err = db.DeleteDoc(ids[23].DocID, ids[23].RevID)
	assertNoError(t, err, "Couldn't delete doc 23")

	alldocs, err = db.AllDocIDs()
	assertNoError(t, err, "AllDocIDs failed")
	assert.Equals(t, len(alldocs), 99)
	for i, entry := range alldocs {
		j := i
		if i >= 23 {
			j++
		}
		assert.DeepEquals(t, entry, ids[j])
	}

	// Inspect the channel log to confirm that it's only got the last 50 sequences.
	// There are 101 sequences overall, so the 1st one it has should be #52.
	log, err := db.GetChangeLog("all", 0)
	assertNoError(t, err, "GetChangeLog")
	assert.Equals(t, log.Since, uint64(51))
	assert.Equals(t, len(log.Entries), 50)
	assert.Equals(t, int(log.Entries[0].Sequence), 52)

	// Now check the changes feed:
	var options ChangesOptions
	changes, err := db.GetChanges(channels.SetOf("all"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 100)
	for i, change := range changes {
		seq := i + 1
		if i >= 23 {
			seq++
		}
		assert.Equals(t, change.Seq, fmt.Sprintf("all:%d", seq))
		assert.Equals(t, change.Deleted, i == 99)
		var removed base.Set
		if i == 99 {
			removed = channels.SetOf("all")
		}
		assert.DeepEquals(t, change.Removed, removed)
	}

	options.IncludeDocs = true
	changes, err = db.GetChanges(channels.SetOf("KFJC"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 10)
	for i, change := range changes {
		assert.Equals(t, change.Seq, fmt.Sprintf("KFJC:%d", 10*i+1))
		assert.Equals(t, change.ID, ids[10*i].DocID)
		assert.Equals(t, change.Deleted, false)
		assert.DeepEquals(t, change.Removed, base.Set(nil))
		assert.Equals(t, change.Doc["serialnumber"], int64(10*i))
	}

	// Trying to add the existing log should fail with no error
	added, err := db.AddChangeLog("all", log)
	assertNoError(t, err, "add channel log")
	assert.False(t, added)

	// Delete the channel log to test if it can be rebuilt:
	assertNoError(t, db.Bucket.Delete(channelLogDocID("all")), "delete channel log")

//.........这里部分代码省略.........

func TestConflicts(t *testing.T) {
	db := setupTestDB(t)
	defer tearDownTestDB(t, db)
	db.ChannelMapper = channels.NewDefaultChannelMapper()

	//base.LogKeys["Cache"] = true
	// base.LogKeys["CRUD"] = true
	// base.LogKeys["Changes"] = true

	// Create rev 1 of "doc":
	body := Body{"n": 1, "channels": []string{"all", "1"}}
	assertNoError(t, db.PutExistingRev("doc", body, []string{"1-a"}), "add 1-a")

	time.Sleep(50 * time.Millisecond) // Wait for tap feed to catch up

	log := db.GetChangeLog("all", 0)
	assert.Equals(t, len(log), 1)

	// Create two conflicting changes:
	body["n"] = 2
	body["channels"] = []string{"all", "2b"}
	assertNoError(t, db.PutExistingRev("doc", body, []string{"2-b", "1-a"}), "add 2-b")
	body["n"] = 3
	body["channels"] = []string{"all", "2a"}
	assertNoError(t, db.PutExistingRev("doc", body, []string{"2-a", "1-a"}), "add 2-a")

	time.Sleep(50 * time.Millisecond) // Wait for tap feed to catch up

	// Verify the change with the higher revid won:
	gotBody, err := db.Get("doc")
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "2-b", "n": int64(2),
		"channels": []interface{}{"all", "2b"}})

	// Verify we can still get the other two revisions:
	gotBody, err = db.GetRev("doc", "1-a", false, nil)
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "1-a", "n": 1,
		"channels": []string{"all", "1"}})
	gotBody, err = db.GetRev("doc", "2-a", false, nil)
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "2-a", "n": 3,
		"channels": []string{"all", "2a"}})

	// Verify the change-log of the "all" channel:
	db.changeCache.waitForSequence(3)
	log = db.GetChangeLog("all", 0)
	assert.Equals(t, len(log), 1)
	assert.Equals(t, log[0].Sequence, uint64(3))
	assert.Equals(t, log[0].DocID, "doc")
	assert.Equals(t, log[0].RevID, "2-b")
	assert.Equals(t, log[0].Flags, uint8(channels.Hidden|channels.Branched|channels.Conflict))

	// Verify the _changes feed:
	options := ChangesOptions{
		Conflicts: true,
	}
	changes, err := db.GetChanges(channels.SetOf("all"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 1)
	assert.DeepEquals(t, changes[0], &ChangeEntry{
		Seq:      SequenceID{Seq: 3},
		ID:       "doc",
		Changes:  []ChangeRev{{"rev": "2-b"}, {"rev": "2-a"}},
		branched: true})

	// Delete 2-b; verify this makes 2-a current:
	rev3, err := db.DeleteDoc("doc", "2-b")
	assertNoError(t, err, "delete 2-b")
	gotBody, err = db.Get("doc")
	assert.DeepEquals(t, gotBody, Body{"_id": "doc", "_rev": "2-a", "n": int64(3),
		"channels": []interface{}{"all", "2a"}})

	// Verify channel assignments are correct for channels defined by 2-a:
	doc, _ := db.GetDoc("doc")
	chan2a, found := doc.Channels["2a"]
	assert.True(t, found)
	assert.True(t, chan2a == nil)             // currently in 2a
	assert.True(t, doc.Channels["2b"] != nil) // has been removed from 2b

	// Verify the _changes feed:
	db.changeCache.waitForSequence(4)
	changes, err = db.GetChanges(channels.SetOf("all"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 1)
	assert.DeepEquals(t, changes[0], &ChangeEntry{
		Seq:      SequenceID{Seq: 4},
		ID:       "doc",
		Changes:  []ChangeRev{{"rev": "2-a"}, {"rev": rev3}},
		branched: true})
}

func TestAllDocs(t *testing.T) {
	// base.LogKeys["Cache"] = true
	// base.LogKeys["Changes"] = true
	db := setupTestDB(t)
	defer tearDownTestDB(t, db)

	// Lower the log expiration time to zero so no more than 50 items will be kept.
	oldChannelCacheAge := ChannelCacheAge
	ChannelCacheAge = 0
	defer func() { ChannelCacheAge = oldChannelCacheAge }()

	/*
		base.LogKeys["Changes"] = true
		base.LogKeys["Changes+"] = true
		defer func() {
			base.LogKeys["Changes"] = false
			base.LogKeys["Changes+"] = false
		}()
	*/

	db.ChannelMapper = channels.NewDefaultChannelMapper()

	ids := make([]AllDocsEntry, 100)
	for i := 0; i < 100; i++ {
		channels := []string{"all"}
		if i%10 == 0 {
			channels = append(channels, "KFJC")
		}
		body := Body{"serialnumber": i, "channels": channels}
		ids[i].DocID = fmt.Sprintf("alldoc-%02d", i)
		revid, err := db.Put(ids[i].DocID, body)
		ids[i].RevID = revid
		ids[i].Sequence = uint64(i + 1)
		ids[i].Channels = channels
		assertNoError(t, err, "Couldn't create document")
	}

	alldocs, err := allDocIDs(db)
	assertNoError(t, err, "AllDocIDs failed")
	assert.Equals(t, len(alldocs), 100)
	for i, entry := range alldocs {
		assert.True(t, entry.Equal(ids[i]))
	}

	// Now delete one document and try again:
	_, err = db.DeleteDoc(ids[23].DocID, ids[23].RevID)
	assertNoError(t, err, "Couldn't delete doc 23")

	alldocs, err = allDocIDs(db)
	assertNoError(t, err, "AllDocIDs failed")
	assert.Equals(t, len(alldocs), 99)
	for i, entry := range alldocs {
		j := i
		if i >= 23 {
			j++
		}
		assert.True(t, entry.Equal(ids[j]))
	}

	// Inspect the channel log to confirm that it's only got the last 50 sequences.
	// There are 101 sequences overall, so the 1st one it has should be #52.
	db.changeCache.waitForSequence(101)
	log := db.GetChangeLog("all", 0)
	assert.Equals(t, len(log), 50)
	assert.Equals(t, int(log[0].Sequence), 52)

	// Now check the changes feed:
	var options ChangesOptions
	options.Terminator = make(chan bool)
	defer close(options.Terminator)
	changes, err := db.GetChanges(channels.SetOf("all"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 100)
	for i, change := range changes {
		seq := i + 1
		if i >= 23 {
			seq++
		}
		assert.Equals(t, change.Seq, SequenceID{Seq: uint64(seq)})
		assert.Equals(t, change.Deleted, i == 99)
		var removed base.Set
		if i == 99 {
			removed = channels.SetOf("all")
		}
		assert.DeepEquals(t, change.Removed, removed)
	}

	options.IncludeDocs = true
	changes, err = db.GetChanges(channels.SetOf("KFJC"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 10)
	for i, change := range changes {
		assert.Equals(t, change.Seq, SequenceID{Seq: uint64(10*i + 1)})
		assert.Equals(t, change.ID, ids[10*i].DocID)
		assert.Equals(t, change.Deleted, false)
		assert.DeepEquals(t, change.Removed, base.Set(nil))
		assert.Equals(t, change.Doc["serialnumber"], int64(10*i))
	}
}

func TestAllDocs(t *testing.T) {
	db := setupTestDB(t)
	defer tearDownTestDB(t, db)

	db.ChannelMapper, _ = channels.NewDefaultChannelMapper()

	ids := make([]IDAndRev, 100)
	for i := 0; i < 100; i++ {
		channels := []string{"all"}
		if i%10 == 0 {
			channels = append(channels, "KFJC")
		}
		body := Body{"serialnumber": i, "channels": channels}
		ids[i].DocID = fmt.Sprintf("alldoc-%02d", i)
		revid, err := db.Put(ids[i].DocID, body)
		ids[i].RevID = revid
		assertNoError(t, err, "Couldn't create document")
	}

	alldocs, err := db.AllDocIDs()
	assertNoError(t, err, "AllDocIDs failed")
	assert.Equals(t, len(alldocs), 100)
	for i, entry := range alldocs {
		assert.DeepEquals(t, entry, ids[i])
	}

	// Now delete one document and try again:
	_, err = db.DeleteDoc(ids[23].DocID, ids[23].RevID)
	assertNoError(t, err, "Couldn't delete doc 23")

	alldocs, err = db.AllDocIDs()
	assertNoError(t, err, "AllDocIDs failed")
	assert.Equals(t, len(alldocs), 99)
	for i, entry := range alldocs {
		j := i
		if i >= 23 {
			j++
		}
		assert.DeepEquals(t, entry, ids[j])
	}

	// Now check the changes feed:
	var options ChangesOptions
	changes, err := db.GetChanges(channels.SetOf("all"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 100)
	for i, change := range changes {
		seq := i + 1
		if i >= 23 {
			seq++
		}
		assert.Equals(t, int(change.Seq), seq)
		assert.Equals(t, change.Deleted, false)
		var removed channels.Set
		if i == 99 {
			removed = channels.SetOf("all")
		}
		assert.DeepEquals(t, change.Removed, removed)
	}

	changes, err = db.GetChanges(channels.SetOf("KFJC"), options)
	assertNoError(t, err, "Couldn't GetChanges")
	assert.Equals(t, len(changes), 10)
	for i, change := range changes {
		assert.Equals(t, int(change.Seq), 10*i+1)
		assert.Equals(t, change.ID, ids[10*i].DocID)
		assert.Equals(t, change.Deleted, false)
		assert.DeepEquals(t, change.Removed, channels.Set(nil))
	}
}