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67 commits

Author SHA1 Message Date
kegsay
21dd5a7176
syncapi: don't return early for no-op incremental syncs (#2473)
* syncapi: don't return early for no-op incremental syncs

Comments explain why, but basically it's an inefficient use
of bandwidth and some sytests rely on /sync to block.

* Honour timeouts

* Actually return a response with timeout=0
2022-05-19 09:00:56 +01:00
kegsay
b3162755a9
bugfix: fix race condition when updating presence via /sync (#2470)
* bugfix: fix race condition when updating presence via /sync

Previously when presence is updated via /sync, we would send the presence update
asyncly via NATS. This created a race condition:
 - If the presence update is processed quickly, the /sync which triggered the presence
   update would see an online presence.
 - If the presence update was processed slowly, the /sync which triggered the presence
   update would see an offline presence.

This is the root cause behind the flakey sytest: 'User sees their own presence in a sync'.

The fix is to ensure we update the database/advance the stream position synchronously
for local users.

* Bugfix for test
2022-05-17 15:53:08 +01:00
Till Faelligen
b57fdcc82d Only try to get OTKs if the context isn't done yet 2022-05-13 10:28:00 +02:00
Till
58af7f61b6
Fix OTK upload spam (#2448)
* Fix OTK spam

* Update comment

* Optimize selectKeysCountSQL to only return max 100 keys

* Return CurrentPosition if the request timed out

* Revert "Return CurrentPosition if the request timed out"

This reverts commit 7dbdda9641.

Co-authored-by: kegsay <kegan@matrix.org>
2022-05-11 17:15:18 +01:00
kegsay
236b16aa6c
Begin adding syncapi component tests (#2442)
* Add very basic syncapi tests

* Add a way to inject jetstream messages

* implement add_state_ids

* bugfixes

* Unbreak tests

* Remove now un-needed API call

* Linting
2022-05-09 17:23:02 +01:00
kegsay
d86dcbef66
syncapi: define specific interfaces for internal HTTP communications (#2416)
* syncapi: use finer-grained interfaces when making the syncapi

* Use specific interfaces for syncapi-roomserver interactions

* Define query access token api for shared http auth code
2022-05-05 09:56:03 +01:00
Till
3c940c428d
Add opt-in anonymous stats reporting (#2249)
* Initial phone home stats queries

* Add userAgent to UpdateDeviceLastSeen
Add new Table for tracking daily user vists

* Add user_daily_visits table

* Fix queries

* userapi stats tables & queries

* userapi interface and internal api

* sycnapi stats queries

* testing phone home stats

* Add complete config to syncapi

* add missing files

* Fix queries

* Send empty request

* Add version & monolith stats

* Add configuration for phone home stats

* Move WASM to its own file, add config and comments

* Add tracing methods

* Add total rooms

* Add more fields, actually send data somewhere

* Move stats to the userapi

* Move phone home stats to util package

* Cleanup

* Linter & parts of GH comments

* More GH comments changes
- Move comments to SQL statements
- Shrink interface, add struct for stats
- No fatal errors, use defaults

* Be more explicit when querying

* Fix wrong calculation & wrong query params
Add tests

* Add Windows stats

* ADd build constraint

* Use new testing structure
Fix issues with getting values when using SQLite
Fix wrong AddDate value
Export UpdateUserDailyVisits

* Fix query params

* Fix test

* Add comment about countR30UsersSQL and countR30UsersV2SQL; fix test

* Update config

* Also update example config file

* Use OS level proxy, update logging

Co-authored-by: kegsay <kegan@matrix.org>
2022-05-04 19:04:28 +02:00
Till
21ee5b36a4
Limit presence in /sync responses (#2394)
* Use filter and limit presence count

* More limiting

* More limiting

* Fix unit test

* Also limit presence by last_active_ts

* Update query, use "from" as the initial lastPos

* Get 1000 presence events, they are filtered later

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
2022-04-28 15:12:40 +01:00
Neil Alexander
66b397b3c6
Don't create fictitious presence entries (#2381)
* Don't create fictitious presence entries for users that don't have any

* Update whitelist, since that test probably shouldn't be passing

* Fix panics
2022-04-27 11:25:07 +01:00
Neil Alexander
6c5c6d73d7
Use a value that is Go 1.16-friendly 2022-04-26 17:05:31 +01:00
Neil Alexander
b527e33c16
Send all account data on complete sync by default
Squashed commit of the following:

commit 0ec8de57261d573a5f88577aa9d7a1174d3999b9
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Tue Apr 26 16:56:30 2022 +0100

    Select filter onto provided target filter

commit da40b6fffbf5737864b223f49900048f557941f9
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Tue Apr 26 16:48:00 2022 +0100

    Specify other field too

commit ffc0b0801f63bb4d3061b6813e3ce5f3b4c8fbcb
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Tue Apr 26 16:45:44 2022 +0100

    Send as much account data as possible during complete sync
2022-04-26 16:58:20 +01:00
Neil Alexander
3a5e9a0f28
Use default sync filter if specified filter is not found (should fix #2350) (#2351) 2022-04-13 16:41:22 +01:00
Till
e8dd37d533
Add metrics for internal API requests (#2310)
* Add response size and requests total to internal handler

* Move MustRegister calls to New* funcs

* Move MustRegister back to init

* Init at some place, minimize changes
2022-04-08 12:24:40 +02:00
Neil Alexander
99ef547295
Simplify presence stringification (should help with vector-im/element-android#5712) 2022-04-07 10:10:28 +01:00
Till
e5e3350ce1
Add presence module V2 (#2312)
* Syncapi presence

* Clientapi http presence handler

* Why is this here?

* Missing files

* FederationAPI presence implementation

* Add new presence stream

* Pinecone update

* Pinecone update

* Add passing tests

* Make linter happy

* Add presence producer

* Add presence config option

* Set user to unavailable after x minutes

* Only set currently_active if online
Avoid unneeded presence updates when syncing

* Tweaks

* Query devices for last_active_ts
Fixes & tweaks

* Export SharedUsers/SharedUsers

* Presence stream in MemoryStorage

* Remove status_msg_nil

* Fix sytest crashes

* Make presence types const and use stringer for it

* Change options to allow inbound/outbound presence

* Fix option & typo

* Update configs

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
2022-04-06 13:11:19 +02:00
Dan
f05ce478f0
Implement Push Notifications (#1842)
* Add Pushserver component with Pushers API

Co-authored-by: Tommie Gannert <tommie@gannert.se>
Co-authored-by: Dan Peleg <dan@globekeeper.com>

* Wire Pushserver component

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

* Add PushGatewayClient.

The full event format is required for Sytest.

* Add a pushrules module.

* Change user API account creation to use the new pushrules module's defaults.

Introduces "scope" as required by client API, and some small field
tweaks to make some 61push Sytests pass.

* Add push rules query/put API in Pushserver.

This manipulates account data over User API, and fires sync messages
for changes. Those sync messages should, according to an existing TODO
in clientapi, be moved to userapi.

Forks clientapi/producers/syncapi.go to pushserver/ for later extension.

* Add clientapi routes for push rules to Pushserver.

A cleanup would be to move more of the name-splitting logic into
pushrules.go, to depollute routing.go.

* Output rooms.join.unread_notifications in /sync.

This is the read-side. Pushserver will be the write-side.

* Implement pushserver/storage for notifications.

* Use PushGatewayClient and the pushrules module in Pushserver's room consumer.

* Use one goroutine per user to avoid locking up the entire server for
  one bad push gateway.
* Split pushing by format.
* Send one device per push. Sytest does not support coalescing
  multiple devices into one push. Matches Synapse. Either we change
  Sytest, or remove the group-by-url-and-format logic.
* Write OutputNotificationData from push server. Sync API is already
  the consumer.

* Implement read receipt consumers in Pushserver.

Supports m.read and m.fully_read receipts.

* Add clientapi route for /unstable/notifications.

* Rename to UpsertPusher for clarity and handle pusher update

* Fix linter errors

* Ignore body.Close() error check

* Fix push server internal http wiring

* Add 40 newly passing 61push tests to whitelist

* Add next 12 newly passing 61push tests to whitelist

* Send notification data before notifying users in EDU server consumer

* NATS JetStream

* Goodbye sarama

* Fix `NewStreamTokenFromString`

* Consume on the correct topic for the roomserver

* Don't panic, NAK instead

* Move push notifications into the User API

* Don't set null values since that apparently causes Element upsetti

* Also set omitempty on conditions

* Fix bug so that we don't override the push rules unnecessarily

* Tweak defaults

* Update defaults

* More tweaks

* Move `/notifications` onto `r0`/`v3` mux

* User API will consume events and read/fully read markers from the sync API with stream positions, instead of consuming directly

Co-authored-by: Piotr Kozimor <p1996k@gmail.com>
Co-authored-by: Tommie Gannert <tommie@gannert.se>
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
2022-03-03 11:40:53 +00:00
kegsay
db7d9cba8a
BREAKING: Remove Partitioned Stream Positions (#2096)
* go mod tidy

* Break complement to check it fails CI

* Remove partitioned stream positions

This was used by the device list stream position. The device list position
now corresponds to the `Offset`, and the partition is always 0, in prep
for removing reliance on Kafka topics for device list changes.

* Linting

* Migrate old style tokens to new style because element-web doesn't soft-logoout on 4xx errors on /sync
2022-01-20 15:26:45 +00:00
Neil Alexander
464b908bd0
Don't return immediately when there's nothing to sync 2021-04-26 16:33:42 +01:00
Neil Alexander
b70238f2d5
Basic sync filtering (#1721)
* Add some filtering (postgres only for now)

* Fix build error

* Try to use request filter

* Use default filter as a template when retrieving from the database

* Remove unused strut

* Update sytest-whitelist

* Add filtering to SelectEarlyEvents

* Fix Postgres selectEarlyEvents query

* Attempt filtering on SQLite

* Test limit, set field for limit/order in prepareWithFilters

* Remove debug logging, add comments

* Tweaks, debug logging

* Separate SQLite stream IDs

* Fix filtering in current state table

* Fix lock issues

* More tweaks

* Current state requires room ID

* Review comments
2021-01-19 18:00:42 +00:00
Neil Alexander
b5a8935042
Sync refactor — Part 1 (#1688)
* It's half-alive

* Wakeups largely working

* Other tweaks, typing works

* Fix bugs, add receipt stream

* Delete notifier, other tweaks

* Dedupe a bit, add a template for the invite stream

* Clean up, add templates for other streams

* Don't leak channels

* Bring forward some more PDU logic, clean up other places

* Add some more wakeups

* Use addRoomDeltaToResponse

* Log tweaks, typing fixed?

* Fix timed out syncs

* Don't reset next batch position on timeout

* Add account data stream/position

* End of day

* Fix complete sync for receipt, typing

* Streams package

* Clean up a bit

* Complete sync send-to-device

* Don't drop errors

* More lightweight notifications

* Fix typing positions

* Don't advance position on remove again unless needed

* Device list updates

* Advance account data position

* Use limit for incremental sync

* Limit fixes, amongst other things

* Remove some fmt.Println

* Tweaks

* Re-add notifier

* Fix invite position

* Fixes

* Notify account data without advancing PDU position in notifier

* Apply account data position

* Get initial position for account data

* Fix position update

* Fix complete sync positions

* Review comments @Kegsay

* Room consumer parameters
2021-01-08 16:59:06 +00:00
Neil Alexander
50963b724b
More sane next batch handling, typing notification tweaks, give invites their own stream position, device list fix (#1641)
* Update sync responses

* Fix positions, add ApplyUpdates

* Fix MarshalText as non-pointer, PrevBatch is optional

* Increment by number of read receipts

* Merge branch 'master' into neilalexander/devicelist

* Tweak typing

* Include keyserver position tweak

* Fix typing next position in all cases

* Tweaks

* Fix typo

* Tweaks, restore StreamingToken.MarshalText which somehow went missing?

* Rely on positions from notifier rather than manually advancing them

* Revert "Rely on positions from notifier rather than manually advancing them"

This reverts commit 53112a62cc.

* Give invites their own position, fix other things

* Fix test

* Fix invites maybe

* Un-whitelist tests that look to be genuinely wrong

* Use real receipt positions

* Ensure send-to-device uses real positions too
2020-12-18 11:11:21 +00:00
Kegsay
42e9cbf342
NOTSPEC: Make ?from= optional in /messages (#1647) 2020-12-16 17:31:03 +00:00
Neil Alexander
56b5847c74
Add prometheus metrics for destination queues, sync requests
Squashed commit of the following:

commit 7ed1c6cfe67429dbe378a763d832c150eb0f781d
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:53:27 2020 +0000

    Updates

commit 8442099d08760b8d086e6d58f9f30284e378a2cd
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:43:18 2020 +0000

    Add some sync statistics

commit ffe2a11644ed3d5297d1775a680886c574143fdb
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:37:00 2020 +0000

    Fix backing off display

commit 27443a93855aa60a49806ecabbf9b09f818301bd
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:28:43 2020 +0000

    Add some destination queue metrics
2020-12-16 15:02:39 +00:00
Neil Alexander
9c03b0a4fa
Refactor sync tokens (#1628)
* Refactor sync tokens

* Comment out broken notifier test

* Update types, sytest-whitelist

* More robust token checking

* Remove New functions for streaming tokens

* Export Logs in StreamingToken

* Fix tests
2020-12-10 18:57:10 +00:00
Neil Alexander
be7d8595be
Peeking updates (#1607)
* Add unpeek

* Don't allow peeks into encrypted rooms

* Fix send tests

* Update consumers
2020-12-03 11:11:46 +00:00
Neil Alexander
b5aa7ca3ab
Top-level setup package (#1605)
* Move config, setup, mscs into "setup" top-level folder

* oops, forgot the EDU server

* Add setup

* goimports
2020-12-02 17:41:00 +00:00
Ariadne Conill
d5b8260196
syncapi/requestpool: fix initial sync logic error in appendAccountData() (#1594)
* requestpool: fix initial sync logic error in appendAccountData()

In initial sync, req.since is no longer nil, but instead,
req.since.PDUPosition() and req.since.EDUPosition() returns 0.

This ensures forgotten rooms do not come back as zombies.

* syncapi/requestpool: reintroduce req.since == nil check
2020-12-01 17:01:34 +00:00
Neil Alexander
c636be5070
Update last seen on sync requests (#1593)
* Update last seen on sync requests

* Fix MSC2836 unit tests

* Only update once per minute

* Remove debug logging

* Configurable option

* Simplify updateLastSeen/cleanLastSeen
2020-11-20 11:29:02 +00:00
S7evinK
bcb89ada5e
Implement read receipts (#1528)
* fix conversion from int to string yields a string of one rune, not a string of digits

* Add receipts table to syncapi

* Use StreamingToken as the since value

* Add required method to testEDUProducer

* Make receipt json creation "easier" to read

* Add receipts api to the eduserver

* Add receipts endpoint

* Add eduserver kafka consumer

* Add missing kafka config

* Add passing tests to whitelist

Signed-off-by: Till Faelligen <tfaelligen@gmail.com>

* Fix copy & paste error

* Fix column count error

* Make outbound federation receipts pass

* Make "Inbound federation rejects receipts from wrong remote" pass

* Don't use errors package

* - Add TODO for batching requests
- Rename variable

* Return a better error message

* - Use OutputReceiptEvent instead of InputReceiptEvent as result
- Don't use the errors package for errors
- Defer CloseAndLogIfError to close rows
- Fix Copyright

* Better creation/usage of JoinResponse

* Query all joined rooms instead of just one

* Update gomatrixserverlib

* Add sqlite3 migration

* Add postgres migration

* Ensure required sequence exists before running migrations

* Clarification on comment

* - Fix a bug when creating client receipts
- Use concrete types instead of interface{}

* Remove dead code
Use key for timestamp

* Fix postgres query...

* Remove single purpose struct

* Use key/value directly

* Only apply receipts on initial sync or if edu positions differ,
otherwise we'll be sending the same receipts over and over again.

* Actually update the id, so it is correctly send in syncs

* Set receipt on request to /read_markers

* Fix issue with receipts getting overwritten

* Use fmt.Errorf instead of pkg/errors

* Revert "Add postgres migration"

This reverts commit 722fe5a046.

* Revert "Add sqlite3 migration"

This reverts commit d113b03f64.

* Fix selectRoomReceipts query

* Make golangci-lint happy

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
2020-11-09 18:46:11 +00:00
Neil Alexander
fb9a8f215b
Fix initial sync (#1465)
* Fix complete sync check

* Remove unnecessary 'since' copy

* Fix failing test

* Un-whitelist a couple of tests

Co-authored-by: Kegan Dougal <kegan@matrix.org>
2020-10-02 12:50:58 +01:00
Matthew Hodgson
39507bacc3
Peeking via MSC2753 (#1370)
Initial implementation of MSC2753, as tested by https://github.com/matrix-org/sytest/pull/944.
Doesn't yet handle unpeeks, peeked EDUs, or history viz changing during a peek - these will follow.
https://github.com/matrix-org/dendrite/pull/1370 has full details.
2020-09-10 14:39:18 +01:00
Kegsay
c992f4f1f4
Remove current state server (#1405)
* Remove current state server

Closes #1365 #1272 #1357

* Remove current state server from scripts/docs
2020-09-07 14:47:59 +01:00
Kegsay
7913759921
Remove QueryBulkStateContent from current state server (#1404)
* Remove QueryBulkStateContent from current state server

Expected fail due to db impl not existing

* Implement query bulk state content

* Fix up rejecting invites over federation

* Fix bulk content marshalling
2020-09-07 12:38:09 +01:00
Kegsay
ca8dcf46b7
Remove QuerySharedUsers from current state server (#1396)
* Remove QuerySharedUsers from current state server

* Bugfixes
2020-09-04 14:25:01 +01:00
Neil Alexander
c42c70597c
Add some error wrapping to sync API, use background context for sync (#1363)
* Add some error wrapping to sync API

* Don't use request context for BeginTx until mattn/go-sqlite3#764 is fixed
2020-08-28 13:28:40 +01:00
Kegsay
ffcb6d2ea1
Produce OTK counts in /sync response (#1235)
* Add QueryOneTimeKeys for /sync extensions

* Unbreak tests

* Produce OTK counts in /sync response

* Linting
2020-08-03 12:29:58 +01:00
Kegsay
b5cb1d1534
Fix edge cases around device lists (#1234)
* Fix New users appear in /keys/changes

* Create blank device keys when logging in on a new device

* Add PerformDeviceUpdate and fix a few bugs

- Correct device deletion query on sqlite
- Return no keys on /keys/query rather than an empty key

* Unbreak sqlite properly

* Use a real DB for currentstateserver integration tests

* Race fix
2020-07-31 14:40:45 +01:00
Kegsay
a2174d3294
Implement /keys/changes (#1232)
* Implement /keys/changes

And refactor QueryKeyChanges to accept a `to` offset.

* Unbreak tests

* Sort keys when serialising log tokens
2020-07-30 14:52:21 +01:00
Kegsay
9355fb5ac8
Hook up device list updates to the sync notifier (#1231)
* WIP hooking up key changes

* Fix import cycle, get tests passing and binary compiling

* Linting and update whitelist
2020-07-30 11:15:46 +01:00
Kegsay
0fdd4f14d1
Add support for logs in StreamingToken (#1229)
* Add support for logs in StreamingToken

Tokens now end up looking like `s11_22|dl-0-123|ab-0-12224`
where `dl` and `ab` are log names, `0` is the partition and
`123` and `12224` are the offsets.

* Also test reserialisation

* s/|/./g so tokens url escape nicely
2020-07-29 19:00:04 +01:00
Kegsay
1ad7219e4b
Implement /sync limited and read timeline limit from stored filters (#1168)
* Move filter table to syncapi where it is used

* Implement /sync `limited` and read timeline limit from stored filters

We now fully handle `room.timeline.limit` filters (in-line + stored) and
return the right value for `limited` syncs.

* Update whitelist

* Default to the default timeline limit if it's unset, also strip the extra event correctly

* Update whitelist
2020-06-26 15:34:41 +01:00
Neil Alexander
7f26b0cd13
Bind build support, further Yggdrasil demo updates (#1152)
* Add gobind builds for Yggdrasil demo

* Massage client API a bit

* Fix build

* Fix gobind build

* Fix gobind client API setup

* Tweaks

* Tweaks

* Update sytest-whitelist, add comment

* Default to sending push rules on initial sync
2020-06-19 13:29:27 +01:00
Neil Alexander
dc0bac85d5
Refactor account data (#1150)
* Refactor account data

* Tweak database fetching

* Tweaks

* Restore syncProducer notification

* Various tweaks, update tag behaviour

* Fix initial sync
2020-06-18 18:36:03 +01:00
Kegsay
83391da0e0
Make syncapi use userapi (#1136)
* Make syncapi use userapi

* Unbreak things

* Fix tests

* Lint
2020-06-16 17:05:38 +01:00
Kegsay
9c77022513
Make userapi responsible for checking access tokens (#1133)
* Make userapi responsible for checking access tokens

There's still plenty of dependencies on account/device DBs, but this
is a start. This is a breaking change as it adds a required config
value `listen.user_api`.

* Cleanup

* Review comments and test fix
2020-06-16 14:10:55 +01:00
Neil Alexander
a5d822004d
Send-to-device support (#1072)
* Groundwork for send-to-device messaging

* Update sample config

* Add unstable routing for now

* Send to device consumer in sync API

* Start the send-to-device consumer

* fix indentation in dendrite-config.yaml

* Create send-to-device database tables, other tweaks

* Add some logic for send-to-device messages, add them into sync stream

* Handle incoming send-to-device messages, count them with EDU stream pos

* Undo changes to test

* pq.Array

* Fix sync

* Logging

* Fix a couple of transaction things, fix client API

* Add send-to-device test, hopefully fix bugs

* Comments

* Refactor a bit

* Fix schema

* Fix queries

* Debug logging

* Fix storing and retrieving of send-to-device messages

* Try to avoid database locks

* Update sync position

* Use latest sync position

* Jiggle about sync a bit

* Fix tests

* Break out the retrieval from the update/delete behaviour

* Comments

* nolint on getResponseWithPDUsForCompleteSync

* Try to line up sync tokens again

* Implement wildcard

* Add all send-to-device tests to whitelist, what could possibly go wrong?

* Only care about wildcard when targeted locally

* Deduplicate transactions

* Handle tokens properly, return immediately if waiting send-to-device messages

* Fix sync

* Update sytest-whitelist

* Fix copyright notice (need to do more of this)

* Comments, copyrights

* Return errors from Do, fix dendritejs

* Review comments

* Comments

* Constructor for TransactionWriter

* defletions

* Update gomatrixserverlib, sytest-blacklist
2020-06-01 17:50:19 +01:00
Neil Alexander
02fe38e1f7
Per-user-per-device sync streams (#1068)
* Per-user-per-device sync streams

* Tweaks

* Tweaks

* Pass full device into CompleteSync

* Set user IDs and device IDs properly in tests

* Add new test, fix TestNewEventAndWasPreviouslyJoinedToRoom

* nolint a function that is not used yet

* Add test for waking up single device

* Hopefully unstick test

* Try to ensure that TestCorrectStreamWakeup doesn't block forever

* Update tests
2020-05-28 10:05:04 +01:00
Kegsay
6091bf044f
sytest: Add remaining backfill tests (#1052)
One failed because of `null` instead of `[]` in HTTP responses.

One failed because we hadn't implemented in-line filter limits!
2020-05-20 17:30:03 +01:00
Kegsay
2b5052eccf
Add Range (#1037)
* Add Range

* Use Range
2020-05-15 09:41:12 +01:00
Kegsay
5e9dce1c0c
syncapi: Rename and split out tokens (#1025)
* syncapi: Rename and split out tokens

Previously we used the badly named `PaginationToken` which was
used for both `/sync` and `/messages` requests. This quickly
became confusing because named fields like `PDUPosition` meant
different things depending on the token type. Instead, we now have
two token types: `TopologyToken` and `StreamingToken`, both of
which have fields which make more sense for their specific situations.

Updated the codebase to use one or the other. `PaginationToken` still
lives on as `syncToken`, an unexported type which both tokens rely on.
This allows us to guarantee that the specific mappings of positions
to a string remain solely under the control of the `types` package.
This enables us to move high-level conceptual things like
"decrement this topological token" to function calls e.g
`TopologicalToken.Decrement()`.

Currently broken because `/messages` seemingly used both stream and
topological tokens, though I need to confirm this.

* final tweaks/hacks

* spurious logging

* Review comments and linting
2020-05-13 12:14:50 +01:00