feat: a simple orderbook web UI

[reliveyy]

This PR adds an optional contianer webui to serve static reactjs application and reverse proxy /api to xud webproxy (8080).

How to test?

Simply run bash setup.sh -b xud-webproxy and open http://localhost:8080

Closes ExchangeUnion/xud#1495
Closes ExchangeUnion/xud#1661 (EDIT by @kilrau )

Todo list

• Update orderbook without refreshing (using grpc-web to connect to the order stream: grpc-web xud#1661)
• Add network and xud version+network on the top right conner
• Security reconsideration (tbd)

[michael1011]

Two more things that would be nice to have in this PR:

• allow to disable the container in the config like the arby one feat(launcher): arby integration #495 (maybe even disable it by default)
• make the port configurable (or is that possible with the port mappings already?)

[kilrau]

Very nice, works like a charme!

Quick feedback: naming and design should be more like in the CLI order book:

• amounts decimal separater missing, should be full ETH, just like on the CLI below
• right-align numbers
• Bid/Ask -> Buy/Sell
• Buy Left side, Sell Right side
• Price colums in the middle
• No node info per order since it aggregates several orders per price point (it replicates orderbook, not listorders for single orders)
• Drop-down currency switcher instead of tabs (there will be a bunch more pairs soon)
• add Alias:
• add Peer Count:

Trading pair: ETH/BTC
┌───────────────────────────────────────┬───────────────────────────────────────┐
│ Buy                                   │ Sell                                  │
├───────────────────┬───────────────────┼───────────────────┬───────────────────┤
│ Quantity          │ Price             │ Price             │ Quantity          │
├───────────────────┼───────────────────┼───────────────────┼───────────────────┤
│ 101.42699664      │ 0.02342016        │ 0.02449947        │ 123               │
├───────────────────┼───────────────────┼───────────────────┼───────────────────┤
│                   │                   │ 0.02451949        │ 0.1               │
├───────────────────┼───────────────────┼───────────────────┼───────────────────┤
│                   │                   │ 0.025             │ 0.1               │
├───────────────────┼───────────────────┼───────────────────┼───────────────────┤
│                   │                   │ 0.02537184        │ 123               │
└───────────────────┴───────────────────┴───────────────────┴───────────────────┘

[kilrau]

Dependency: @sangaman 's feedback on how easy moving web-proxy -> grpc web is to get the https://api.exchangeunion.com/#subscribeorders working.

[kilrau]

* allow to disable the container in the config like the arby one #495 (maybe even disable it by default)

Agree on both.

* make the port configurable (or is that possible with the port mappings already?)

Should be and if we add a expose-ports = ["58080:8080"] and a new [web-ui] section to the sample-config it's even obvious :)

[reliveyy]

Current main blocking issue is grpc-web client throws error

upstream connect error or disconnect/reset before headers. reset reason: connection termination

envoy.yaml cluster type set to strict_dns seems successfully resolved domain name "xud". (type original value logical_dns cannot)

[2020-06-26 10:42:02.796][1][trace][upstream] [source/common/upstream/strict_dns_cluster.cc:101] starting async DNS resolution for xud
[2020-06-26 10:42:02.796][1][trace][upstream] [source/common/network/dns_impl.cc:196] Setting DNS resolution timer for 5000 milliseconds
[2020-06-26 10:42:02.797][1][trace][upstream] [source/common/network/dns_impl.cc:196] Setting DNS resolution timer for 5000 milliseconds
[2020-06-26 10:42:02.797][1][trace][upstream] [source/common/upstream/strict_dns_cluster.cc:109] async DNS resolution complete for xud
[2020-06-26 10:42:02.797][1][debug][upstream] [source/common/upstream/upstream_impl.cc:275] transport socket match, socket default selected for host with address 10.0.1.5:28885
[2020-06-26 10:42:02.797][1][debug][upstream] [source/common/upstream/strict_dns_cluster.cc:162] DNS refresh rate reset for xud, refresh rate 5000 ms

[reliveyy]

Could be related to xud gRPC needs tls

[reliveyy]

Envoy exits with the error:

Failed to load certificate chain from /root/.xud/tls.cert, only RSA certificates with 2048-bit or larger keys are supported

[reliveyy]

There seems to be no way to let envoy accept 1024-bit TLS cert. So two options I thought:

1. Generate 2048-bit TLS cert in xud;
2. Provide an option to turn off TLS authentication in xud.

Wdyt? @kilrau @sangaman

[kilrau]

I'd go for

1. Generate 2048-bit TLS cert in xud

[reliveyy]

Got OPENSSL_internal:WRONG_VERSION_NUMBER

[2020-06-28 20:03:49.787][21][debug][connection] [source/extensions/transport_sockets/tls/ssl_socket.cc:198] [C4] handshake error: 1
[2020-06-28 20:03:49.787][21][debug][connection] [source/extensions/transport_sockets/tls/ssl_socket.cc:226] [C4] TLS error: 268435703:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER
[2020-06-28 20:03:49.787][21][debug][connection] [source/common/network/connection_impl.cc:200] [C4] closing socket: 0
[2020-06-28 20:03:49.787][21][debug][client] [source/common/http/codec_client.cc:91] [C4] disconnect. resetting 0 pending requests
[2020-06-28 20:03:49.787][21][debug][pool] [source/common/http/conn_pool_base.cc:265] [C4] client disconnected, failure reason: TLS error: 268435703:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER
[2020-06-28 20:03:49.787][21][debug][router] [source/common/router/router.cc:1018] [C3][S13872877465530581752] upstream reset: reset reason connection failure
[2020-06-28 20:03:49.787][21][debug][http] [source/common/http/conn_manager_impl.cc:1475] [C3][S13872877465530581752] Sending local reply with details upstream_reset_before_response_started{connection failure,TLS error: 268435703:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER}

[reliveyy]

New tls error

[2020-06-29 00:37:00.250][19][debug][connection] [source/extensions/transport_sockets/tls/ssl_socket.cc:198] [C0] handshake error: 1
[2020-06-29 00:37:00.250][19][debug][connection] [source/extensions/transport_sockets/tls/ssl_socket.cc:226] [C0] TLS error: 268435612:SSL routines:OPENSSL_internal:HTTP_REQUEST

[reliveyy]

We are facing the same issue like envoyproxy/envoy#11582

[reliveyy]

Will reopen this PR when breakthrough in grpc-web TLS.