Update INSTALL.md, move docs (#1034)

* Update INSTALL.md

* Move some things

* Clean up

* Move some more things

* Don't build all the things for the monolith

* Update INSTALL.md

* Nuke hooks

10 files changed, 131 insertions, 112 deletions

diff --git a/.editorconfig b/.editorconfig
deleted file mode 100644
index 1fee5617..00000000
--- a/.editorconfig
+++ /dev/null
@@ -1,18 +0,0 @@
-root = true
-
-[*]
-charset = utf-8
-
-end_of_line = lf
-insert_final_newline = true
-trim_trailing_whitespace = true
-
-[*.go]
-indent_style = tab
-indent_size = 4
-
-[*.md]
-trim_trailing_whitespace = false
-
-[*.{yml,yaml}]
-indent_style = space
diff --git a/README.md b/README.md
index 49f9ca84..aa9060f1 100644
--- a/README.md
+++ b/README.md
@@ -3,15 +3,15 @@
 Dendrite will be a second-generation Matrix homeserver written in Go.
 
 It's still very much a work in progress, but installation instructions can be
-found in [INSTALL.md](INSTALL.md). It is not recommended to use Dendrite as a
+found in [INSTALL.md](docs/INSTALL.md). It is not recommended to use Dendrite as a
 production homeserver at this time.
 
-An overview of the design can be found in [DESIGN.md](DESIGN.md).
+An overview of the design can be found in [DESIGN.md](docs/DESIGN.md).
 
 # Contributing
 
 Everyone is welcome to help out and contribute! See
-[CONTRIBUTING.md](CONTRIBUTING.md) to get started!
+[CONTRIBUTING.md](docs/CONTRIBUTING.md) to get started!
 
 Please note that, as of February 2020, Dendrite now only targets Go 1.13 or
 later. Please ensure that you are using at least Go 1.13 when developing for
diff --git a/CODE_STYLE.md b/docs/CODE_STYLE.md
index 1f40c76f..1f40c76f 100644
--- a/CODE_STYLE.md
+++ b/docs/CODE_STYLE.md
diff --git a/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index 0bcd2bb1..0bcd2bb1 100644
--- a/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
diff --git a/DESIGN.md b/docs/DESIGN.md
index 80e251c5..80e251c5 100644
--- a/DESIGN.md
+++ b/docs/DESIGN.md
diff --git a/INSTALL.md b/docs/INSTALL.md
index 4173e705..184b777d 100644
--- a/INSTALL.md
+++ b/docs/INSTALL.md
@@ -2,38 +2,66 @@
 
 Dendrite can be run in one of two configurations:
 
- * A cluster of individual components, dealing with different aspects of the
-   Matrix protocol (see [WIRING.md](./WIRING.md)). Components communicate with
-   one another via [Apache Kafka](https://kafka.apache.org).
+* **Polylith mode**: A cluster of individual components, dealing with different
+  aspects of the Matrix protocol (see [WIRING.md](WIRING.md)). Components communicate with each other using internal HTTP APIs and [Apache Kafka](https://kafka.apache.org). This will almost certainly be the preferred model
+  for large-scale deployments.
 
- * A monolith server, in which all components run in the same process. In this
-   configuration, Kafka can be replaced with an in-process implementation
-   called [naffka](https://github.com/matrix-org/naffka).
+* **Monolith mode**: All components run in the same process. In this mode,
+   Kafka is completely optional and can instead be replaced with an in-process
+   lightweight implementation called [Naffka](https://github.com/matrix-org/naffka). This will usually be the preferred model for low-volume, low-user
+   or experimental deployments.
+
+Regardless of whether you are running in polylith or monolith mode, each Dendrite component that requires storage has its own database. Both Postgres
+and SQLite are supported and can be mixed-and-matched across components as
+needed in the configuration file.
+
+Be advised that Dendrite is still developmental and it's not recommended for
+use in production environments yet!
 
 ## Requirements
 
- - Go 1.13+
- - Postgres 9.5+
- - For Kafka (optional if using the monolith server):
-   - Unix-based system (https://kafka.apache.org/documentation/#os)
-   - JDK 1.8+ / OpenJDK 1.8+
-   - Apache Kafka 0.10.2+ (see [scripts/install-local-kafka.sh](scripts/install-local-kafka.sh) for up-to-date version numbers)
+Dendrite requires:
+
+* Go 1.13 or higher
+* Postgres 9.5 or higher (if using Postgres databases, not needed for SQLite)
+
+If you want to run a polylith deployment, you also need:
 
+* Apache Kafka 0.10.2+
 
-## Setting up a development environment
+## Building up a monolith deploment
 
-Assumes Go 1.13+ and JDK 1.8+ are already installed and are on PATH.
+Start by cloning the code:
 
 ```bash
-# Get the code
 git clone https://github.com/matrix-org/dendrite
 cd dendrite
+```
+
+Then build it:
+
+```bash
+go build -o bin/dendrite-monolith-server ./cmd/dendrite-monolith-server
+go build -o bin/generate-keys ./cmd/generate-keys
+```
+
+## Building up a polylith deployment
+
+Start by cloning the code:
 
-# Build it
+```bash
+git clone https://github.com/matrix-org/dendrite
+cd dendrite
+```
+
+Then build it:
+
+```bash
 ./build.sh
 ```
 
-If using Kafka, install and start it (c.f. [scripts/install-local-kafka.sh](scripts/install-local-kafka.sh)):
+Install and start Kafka (c.f. [scripts/install-local-kafka.sh](scripts/install-local-kafka.sh)):
+
 ```bash
 KAFKA_URL=http://archive.apache.org/dist/kafka/2.1.0/kafka_2.11-2.1.0.tgz
 
@@ -51,7 +79,7 @@ kafka/bin/zookeeper-server-start.sh -daemon kafka/config/zookeeper.properties
 kafka/bin/kafka-server-start.sh -daemon kafka/config/server.properties
 ```
 
-On MacOS, you can use [homebrew](https://brew.sh/) for easier setup of kafka
+On macOS, you can use [Homebrew](https://brew.sh/) for easier setup of Kafka:
 
 ```bash
 brew install kafka
@@ -61,15 +89,24 @@ brew services start kafka
 
 ## Configuration
 
+### SQLite database setup
+
+Dendrite can use the built-in SQLite database engine for small setups.
+The SQLite databases do not need to be preconfigured - Dendrite will
+create them automatically at startup.
+
 ### Postgres database setup
 
-Dendrite requires a postgres database engine, version 9.5 or later.
+Assuming that Postgres 9.5 (or later) is installed:
+
+* Create role, choosing a new password when prompted:
 
-* Create role:
   ```bash
-  sudo -u postgres createuser -P dendrite     # prompts for password
+  sudo -u postgres createuser -P dendrite
   ```
-* Create databases:
+
+* Create the component databases:
+
   ```bash
   for i in account device mediaapi syncapi roomserver serverkey federationsender publicroomsapi appservice naffka; do
       sudo -u postgres createdb -O dendrite dendrite_$i
@@ -78,42 +115,56 @@ Dendrite requires a postgres database engine, version 9.5 or later.
 
 (On macOS, omit `sudo -u postgres` from the above commands.)
 
-### Crypto key generation
+### Server key generation
 
-Generate the keys:
+Each Dendrite server requires unique server keys.
+
+Generate the self-signed SSL certificate for federation:
 
 ```bash
-# Generate a self-signed SSL cert for federation:
 test -f server.key || openssl req -x509 -newkey rsa:4096 -keyout server.key -out server.crt -days 3650 -nodes -subj /CN=localhost
+```
+
+Generate the server signing key:
 
-# generate ed25519 signing key
+```
 test -f matrix_key.pem || ./bin/generate-keys -private-key matrix_key.pem
 ```
 
-### Configuration
+### Configuration file
 
 Create config file, based on `dendrite-config.yaml`. Call it `dendrite.yaml`. Things that will need editing include *at least*:
-* `server_name`
-* `database/*` (All lines in the database section must have the username and password of the user created with the `createuser` command above. eg:`dendrite:password@localhost`)
 
+* The `server_name` entry to reflect the hostname of your Dendrite server
+* The `database` lines with an updated connection string based on your
+  desired setup, e.g. replacing `component` with the name of the component:
+  * For Postgres: `postgres://dendrite:password@localhost/component`
+  * For SQLite on disk: `file:component.db` or `file:///path/to/component.db`
+  * Postgres and SQLite can be mixed and matched.
+* The `use_naffka` option if using Naffka in a monolith deployment
+
+There are other options which may be useful so review them all. In particular,
+if you are trying to federate from your Dendrite instance into public rooms
+then configuring `key_perspectives` (like `matrix.org` in the sample) can
+help to improve reliability considerably by allowing your homeserver to fetch
+public keys for dead homeservers from somewhere else.
 
 ## Starting a monolith server
 
-It is possible to use 'naffka' as an in-process replacement to Kafka when using
-the monolith server. To do this, set `use_naffka: true` in `dendrite.yaml` and uncomment
-the necessary line related to naffka in the `database` section. Be sure to update the
-database username and password if needed.
+It is possible to use Naffka as an in-process replacement to Kafka when using
+the monolith server. To do this, set `use_naffka: true` in your `dendrite.yaml` configuration and uncomment the relevant Naffka line in the `database` section.
+Be sure to update the database username and password if needed.
 
 The monolith server can be started as shown below. By default it listens for
-HTTP connections on port 8008, so point your client at
-`http://localhost:8008`. If you set `--tls-cert` and `--tls-key` as shown
-below, it will also listen for HTTPS connections on port 8448.
+HTTP connections on port 8008, so you can configure your Matrix client to use
+`http://localhost:8008` as the server. If you set `--tls-cert` and `--tls-key`
+as shown below, it will also listen for HTTPS connections on port 8448.
 
 ```bash
 ./bin/dendrite-monolith-server --tls-cert=server.crt --tls-key=server.key
 ```
 
-## Starting a multiprocess server
+## Starting a polylith deployment
 
 The following contains scripts which will run all the required processes in order to point a Matrix client at Dendrite. Conceptually, you are wiring together to form the following diagram:
 
@@ -170,9 +221,10 @@ Servers --->| federation-api-proxy |--------->| dendrite-federation-api-server |
    A ==> B  = Kafka (A = producer, B = consumer)
 ```
 
-### Run a client api proxy
+### Client proxy
 
-This is what Matrix clients will talk to. If you use the script below, point your client at `http://localhost:8008`.
+This is what Matrix clients will talk to. If you use the script below, point
+your client at `http://localhost:8008`.
 
 ```bash
 ./bin/client-api-proxy \
@@ -183,17 +235,28 @@ This is what Matrix clients will talk to. If you use the script below, point you
 --public-rooms-api-server-url "http://localhost:7775" \
 ```
 
-### Run a client api
+### Federation proxy
 
-This is what implements message sending. Clients talk to this via the proxy in order to send messages.
+This is what Matrix servers will talk to. This is only required if you want
+to support federation.
 
 ```bash
-./bin/dendrite-client-api-server --config=dendrite.yaml
+./bin/federation-api-proxy \
+--bind-address ":8448" \
+--federation-api-url "http://localhost:7772" \
+--media-api-server-url "http://localhost:7774" \
 ```
 
-(If this fails with `pq: syntax error at or near "ON"`, check you are using at least postgres 9.5.)
+### Client API server
 
-### Run a room server
+This is what implements message sending. Clients talk to this via the proxy in
+order to send messages.
+
+```bash
+./bin/dendrite-client-api-server --config=dendrite.yaml
+```
+
+### Room server
 
 This is what implements the room DAG. Clients do not talk to this.
 
@@ -201,42 +264,34 @@ This is what implements the room DAG. Clients do not talk to this.
 ./bin/dendrite-room-server --config=dendrite.yaml
 ```
 
-### Run a sync server
+### Sync server
 
-This is what implements `/sync` requests. Clients talk to this via the proxy in order to receive messages.
+This is what implements `/sync` requests. Clients talk to this via the proxy
+in order to receive messages.
 
 ```bash
 ./bin/dendrite-sync-api-server --config dendrite.yaml
 ```
 
-### Run a media server
+### Media server
 
-This implements `/media` requests. Clients talk to this via the proxy in order to upload and retrieve media.
+This implements `/media` requests. Clients talk to this via the proxy in
+order to upload and retrieve media.
 
 ```bash
 ./bin/dendrite-media-api-server --config dendrite.yaml
 ```
 
-### Run public room server
+### Public room server
 
-This implements `/directory` requests. Clients talk to this via the proxy in order to retrieve room directory listings.
+This implements `/directory` requests. Clients talk to this via the proxy
+in order to retrieve room directory listings.
 
 ```bash
 ./bin/dendrite-public-rooms-api-server --config dendrite.yaml
 ```
 
-### Run a federation api proxy
-
-This is what Matrix servers will talk to. This is only required if you want to support federation.
-
-```bash
-./bin/federation-api-proxy \
---bind-address ":8448" \
---federation-api-url "http://localhost:7772" \
---media-api-server-url "http://localhost:7774" \
-```
-
-### Run a federation api server
+### Federation API server
 
 This implements federation requests. Servers talk to this via the proxy in
 order to send transactions.  This is only required if you want to support
@@ -246,7 +301,7 @@ federation.
 ./bin/dendrite-federation-api-server --config dendrite.yaml
 ```
 
-### Run a federation sender server
+### Federation sender
 
 This sends events from our users to other servers.  This is only required if
 you want to support federation.
@@ -255,7 +310,7 @@ you want to support federation.
 ./bin/dendrite-federation-sender-server --config dendrite.yaml
 ```
 
-### Run an appservice server
+### Appservice server
 
 This sends events from the network to [application
 services](https://matrix.org/docs/spec/application_service/unstable.html)
@@ -265,3 +320,12 @@ application services on your homeserver.
 ```bash
 ./bin/dendrite-appservice-server --config dendrite.yaml
 ```
+
+### Key server
+
+This manages end-to-end encryption keys (or rather, it will do when it's
+finished).
+
+```bash
+./bin/dendrite-key-server --config dendrite.yaml
+```
diff --git a/WIRING.md b/docs/WIRING.md
index 8ec5b043..8ec5b043 100644
--- a/WIRING.md
+++ b/docs/WIRING.md
diff --git a/p2p.md b/docs/p2p.md
index 141aaa1f..141aaa1f 100644
--- a/p2p.md
+++ b/docs/p2p.md
diff --git a/hooks/install.sh b/hooks/install.sh
deleted file mode 100755
index f8aa331f..00000000
--- a/hooks/install.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#! /bin/bash
-
-DOT_GIT="$(dirname $0)/../.git"
-
-ln -s "../../hooks/pre-commit" "$DOT_GIT/hooks/pre-commit"
\ No newline at end of file
diff --git a/hooks/pre-commit b/hooks/pre-commit
deleted file mode 100755
index 6f98b813..00000000
--- a/hooks/pre-commit
+++ /dev/null
@@ -1,22 +0,0 @@
-#! /bin/bash
-
-set -eu
-
-# make the GIT_DIR and GIT_INDEX_FILE absolute, before we change dir
-export GIT_DIR=$(readlink -f `git rev-parse --git-dir`)
-if [ -n "${GIT_INDEX_FILE:+x}" ]; then
-    export GIT_INDEX_FILE=$(readlink -f "$GIT_INDEX_FILE")
-fi
-
-# create a temp dir. The `trap` incantation will ensure that it is removed
-# again when this script completes.
-tmpdir=`mktemp -d`
-trap 'rm -rf "$tmpdir"' EXIT
-cd "$tmpdir"
-
-# get a clean copy of the index (ie, what has been `git add`ed), so that we can
-# run the checks against what we are about to commit, rather than what is in
-# the working copy.
-git checkout-index -a
-
-./scripts/find-lint.sh fast