Add contributing guide

Python 3.6 EOLed at the end of 2021, see https://endoflife.date/python.
(pyO3 was refusing to build against 3.6).

.dockerignore

@@ -0,0 +1,3 @@
+.git
+.github
+/target

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+# Automatically request reviews from the synapse-core team when a pull request comes in.
+* @matrix-org/synapse-core

CONTRIBUTING.md

@@ -0,0 +1,80 @@
+# Contributing
+
+## Sign off
+
+In order to have a concrete record that your contribution is intentional
+and you agree to license it under the same terms as the project's license, we've adopted the
+same lightweight approach that the Linux Kernel
+[submitting patches process](
+https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin>),
+[Docker](https://github.com/docker/docker/blob/master/CONTRIBUTING.md), and many other
+projects use: the DCO ([Developer Certificate of Origin](http://developercertificate.org/)).
+This is a simple declaration that you wrote
+the contribution or otherwise have the right to contribute it to Matrix:
+
+```
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+660 York Street, Suite 102,
+San Francisco, CA 94110 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+```
+
+If you agree to this for your contribution, then all that's needed is to
+include the line in your commit or pull request comment:
+
+```
+Signed-off-by: Your Name <your@email.example.org>
+```
+
+We accept contributions under a legally identifiable name, such as
+your name on government documentation or common-law names (names
+claimed by legitimate usage or repute). Unfortunately, we cannot
+accept anonymous contributions at this time.
+
+Git allows you to add this signoff automatically when using the `-s`
+flag to `git commit`, which uses the name and email set in your
+`user.name` and `user.email` git configs.
+
+### Private Sign off
+
+If you would like to provide your legal name privately to the Matrix.org
+Foundation (instead of in a public commit or comment), you can do so
+by emailing your legal name and a link to the pull request to
+[dco@matrix.org](mailto:dco@matrix.org?subject=Private%20sign%20off).
+It helps to include "sign off" or similar in the subject line. You will then
+be instructed further.
+
+Once private sign off is complete, doing so for future contributions will not
+be required.
+

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["auto_compressor", "compressor_integration_tests"]
+members = ["synapse_auto_compressor", "compressor_integration_tests"]
 
 [package]
 authors = ["Erik Johnston"]
@@ -9,9 +9,7 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-clap = "2.33.0"
 indicatif = "0.16.0"
-jemallocator = "0.3.2"
 openssl = "0.10.32"
 postgres = "0.19.0"
 postgres-openssl = "0.5.0"
@@ -20,7 +18,7 @@ rayon = "1.3.0"
 string_cache = "0.8.0"
 env_logger = "0.9.0"
 log = "0.4.14"
-pyo3-log = "0.4.0"
+pyo3-log = "0.6.0"
 log-panics = "2.0.0"
 
 [dependencies.state-map]
@@ -30,11 +28,19 @@ git = "https://github.com/matrix-org/rust-matrix-state-map"
 [lib]
 crate-type = ["cdylib", "rlib"]
 
+[dependencies.clap]
+version = "3.1.14"
+features = ["cargo"]
+
 [dependencies.pyo3]
-version = "0.14.1"
+version = "0.16.4"
-features = ["extension-module","abi3-py36"]
+features = ["extension-module"]
+
+[dependencies.tikv-jemallocator]
+version = "0.5.0"
+optional = true
 
 [features]
 default = ["jemalloc"]
-jemalloc = []
+jemalloc = ["tikv-jemallocator"]
 no-progress-bars = []

Dockerfile

@@ -0,0 +1,22 @@
+FROM rust:alpine AS builder
+
+RUN apk add python3 musl-dev pkgconfig openssl-dev make
+
+ENV RUSTFLAGS="-C target-feature=-crt-static"
+
+WORKDIR /opt/synapse-compressor/
+
+COPY . .
+
+RUN cargo build
+
+WORKDIR /opt/synapse-compressor/synapse_auto_compressor/
+
+RUN cargo build
+
+FROM alpine
+
+RUN apk add --no-cache libgcc
+
+COPY --from=builder /opt/synapse-compressor/target/debug/synapse_compress_state /usr/local/bin/synapse_compress_state
+COPY --from=builder /opt/synapse-compressor/target/debug/synapse_auto_compressor /usr/local/bin/synapse_auto_compressor

README.md

@@ -3,7 +3,7 @@
 This workspace contains experimental tools that attempt to reduce the number of
 rows in the `state_groups_state` table inside of a Synapse Postgresql database.
 
-# Automated tool: auto_compressor
+# Automated tool: synapse_auto_compressor
 
 ## Introduction:
 
@@ -11,7 +11,7 @@ This tool is significantly more simple to use than the manual tool (described be
 It scans through all of the rows in the `state_groups` database table from the start. When
 it finds a group that hasn't been compressed, it runs the compressor for a while on that
 group's room, saving where it got up to. After compressing a number of these chunks it stops,
-saving where it got up to for the next run of the `auto_compressor`.
+saving where it got up to for the next run of the `synapse_auto_compressor`.
 
 It creates three extra tables in the database: `state_compressor_state` which stores the
 information needed to stop and start the compressor for each room, `state_compressor_progress`
@@ -21,41 +21,42 @@ which stores how far through the `state_groups` table the compressor has scanned
 The tool can be run manually when you are running out of space, or be scheduled to run
 periodically.
 
-## Building 
+## Building
 
 This tool requires `cargo` to be installed. See https://www.rust-lang.org/tools/install
 for instructions on how to do this.
 
-To build `auto_compressor`, clone this repository and navigate to the `autocompressor/` 
+To build `synapse_auto_compressor`, clone this repository and navigate to the
-subdirectory. Then execute `cargo build`.
+`synapse_auto_compressor/` subdirectory. Then execute `cargo build`.
 
-This will create an executable and store it in `auto_compressor/target/debug/auto_compressor`.
+This will create an executable and store it in
+`synapse_auto_compressor/target/debug/synapse_auto_compressor`.
 
 ## Example usage
 ```
-$ auto_compressor -p postgresql://user:pass@localhost/synapse -c 500 -n 100
+$ synapse_auto_compressor -p postgresql://user:pass@localhost/synapse -c 500 -n 100
 ```
 ## Running Options
 
-- -p [POSTGRES_LOCATION] **Required**  
+- -p [POSTGRES_LOCATION] **Required**
 The configuration for connecting to the Postgres database. This should be of the form
 `"postgresql://username:password@mydomain.com/database"` or a key-value pair
 string: `"user=username password=password dbname=database host=mydomain.com"`
 See https://docs.rs/tokio-postgres/0.7.2/tokio_postgres/config/struct.Config.html
 for the full details.
 
-- -c [CHUNK_SIZE] **Required**  
+- -c [CHUNK_SIZE] **Required**
 The number of state groups to work on at once. All of the entries from state_groups_state are
 requested from the database for state groups that are worked on. Therefore small chunk
 sizes may be needed on machines with low memory. Note: if the compressor fails to find
 space savings on the chunk as a whole (which may well happen in rooms with lots of backfill
 in) then the entire chunk is skipped.
 
-- -n [CHUNKS_TO_COMPRESS] **Required**  
+- -n [CHUNKS_TO_COMPRESS] **Required**
 *CHUNKS_TO_COMPRESS* chunks of size *CHUNK_SIZE* will be compressed. The higher this
 number is set to, the longer the compressor will run for.
 
-- -d [LEVELS]  
+- -d [LEVELS]
 Sizes of each new level in the compression algorithm, as a comma-separated list.
 The first entry in the list is for the lowest, most granular level, with each
 subsequent entry being for the next highest level. The number of entries in the
@@ -67,14 +68,14 @@ given set of state. [defaults to "100,50,25"]
 ## Scheduling the compressor
 The automatic tool may put some strain on the database, so it might be best to schedule
 it to run at a quiet time for the server. This could be done by creating an executable
-script and scheduling it with something like 
+script and scheduling it with something like
 [cron](https://www.man7.org/linux/man-pages/man1/crontab.1.html).
 
 # Manual tool: synapse_compress_state
 
 ## Introduction
 
-A manual tool that reads in the rows from `state_groups_state` and `state_group_edges` 
+A manual tool that reads in the rows from `state_groups_state` and `state_group_edges`
 tables for a specified room and calculates the changes that could be made that
 (hopefully) will significantly reduce the number of rows.
 
@@ -85,7 +86,7 @@ that if `-t` is given then each change to a particular state group is wrapped
 in a transaction). If you do wish to send the changes to the database automatically
 then the `-c` flag can be set.
 
-The SQL generated is safe to apply against the database with Synapse running. 
+The SQL generated is safe to apply against the database with Synapse running.
 This is because the `state_groups` and `state_groups_state` tables are append-only:
 once written to the database, they are never modified. There is therefore no danger
 of a modification racing against a running Synapse. Further, this script makes its
@@ -95,7 +96,7 @@ from any of the queries that Synapse performs.
 The tool will also ensure that the generated state deltas do give the same state
 as the existing state deltas before generating any SQL.
 
-## Building 
+## Building
 
 This tool requires `cargo` to be installed. See https://www.rust-lang.org/tools/install
 for instructions on how to do this.
@@ -125,54 +126,54 @@ $ psql synapse < out.data
 
 ## Running Options
 
-- -p [POSTGRES_LOCATION] **Required**  
+- -p [POSTGRES_LOCATION] **Required**
 The configuration for connecting to the Postgres database. This should be of the form
 `"postgresql://username:password@mydomain.com/database"` or a key-value pair
 string: `"user=username password=password dbname=database host=mydomain.com"`
 See https://docs.rs/tokio-postgres/0.7.2/tokio_postgres/config/struct.Config.html
 for the full details.
 
-- -r [ROOM_ID] **Required**  
+- -r [ROOM_ID] **Required**
 The room to process (this is the value found in the `rooms` table of the database
 not the common name for the room - it should look like: "!wOlkWNmgkAZFxbTaqj:matrix.org".
 
-- -b [MIN_STATE_GROUP]  
+- -b [MIN_STATE_GROUP]
 The state group to start processing from (non-inclusive).
 
-- -n [GROUPS_TO_COMPRESS]  
+- -n [GROUPS_TO_COMPRESS]
 How many groups to load into memory to compress (starting
 from the 1st group in the room or the group specified by -b).
 
-- -l [LEVELS]  
+- -l [LEVELS]
 Sizes of each new level in the compression algorithm, as a comma-separated list.
-The first entry in the list is for the lowest, most granular level, with each 
+The first entry in the list is for the lowest, most granular level, with each
 subsequent entry being for the next highest level. The number of entries in the
 list determines the number of levels that will be used. The sum of the sizes of
 the levels affects the performance of fetching the state from the database, as the
 sum of the sizes is the upper bound on the number of iterations needed to fetch a
 given set of state. [defaults to "100,50,25"]
 
-- -m [COUNT]  
+- -m [COUNT]
 If the compressor cannot save this many rows from the database then it will stop early.
 
-- -s [MAX_STATE_GROUP]  
+- -s [MAX_STATE_GROUP]
 If a max_state_group is specified then only state groups with id's lower than this
 number can be compressed.
 
-- -o [FILE]  
+- -o [FILE]
 File to output the SQL transactions to (for later running on the database).
 
-- -t  
+- -t
 If this flag is set then each change to a particular state group is wrapped in a
 transaction. This should be done if you wish to apply the changes while synapse is
 still running.
 
-- -c  
+- -c
 If this flag is set then the changes the compressor makes will be committed to the
 database. This should be safe to use while synapse is running as it wraps the changes
 to every state group in it's own transaction (as if the transaction flag was set).
 
-- -g  
+- -g
 If this flag is set then output the node and edge information for the state_group
 directed graph built up from the predecessor state_group links. These can be looked
 at in something like Gephi (https://gephi.org).
@@ -196,10 +197,10 @@ $ docker-compose down
 # Using the synapse_compress_state library
 
 If you want to use the compressor in another project, it is recomended that you
-use jemalloc `https://github.com/gnzlbg/jemallocator`. 
+use jemalloc `https://github.com/tikv/jemallocator`.
 
 To prevent the progress bars from being shown, use the `no-progress-bars` feature.
-(See `auto_compressor/Cargo.toml` for an example)
+(See `synapse_auto_compressor/Cargo.toml` for an example)
 
 # Troubleshooting
 
@@ -216,29 +217,29 @@ from the machine where Postgres is running, the url will be the following:
 ### From remote machine
 
 If you wish to connect from a different machine, you'll need to edit your Postgres settings to allow
-remote connections. This requires updating the 
+remote connections. This requires updating the
 [`pg_hba.conf`](https://www.postgresql.org/docs/current/auth-pg-hba-conf.html) and the `listen_addresses`
 setting in [`postgresql.conf`](https://www.postgresql.org/docs/current/runtime-config-connection.html)
 
 ## Printing debugging logs
 
-The amount of output the tools produce can be altered by setting the RUST_LOG 
+The amount of output the tools produce can be altered by setting the RUST_LOG
-environment variable to something. 
+environment variable to something.
 
-To get more logs when running the auto_compressor tool try the following:
+To get more logs when running the synapse_auto_compressor tool try the following:
 
 ```
-$ RUST_LOG=debug auto_compressor -p postgresql://user:pass@localhost/synapse -c 50 -n 100
+$ RUST_LOG=debug synapse_auto_compressor -p postgresql://user:pass@localhost/synapse -c 50 -n 100
 ```
 
-If you want to suppress all the debugging info you are getting from the 
+If you want to suppress all the debugging info you are getting from the
 Postgres client then try:
 
 ```
-RUST_LOG=auto_compressor=debug,synapse_compress_state=debug auto_compressor [etc.]
+RUST_LOG=synapse_auto_compressor=debug,synapse_compress_state=debug synapse_auto_compressor [etc.]
 ```
 
-This will only print the debugging information from those two packages. For more info see 
+This will only print the debugging information from those two packages. For more info see
 https://docs.rs/env_logger/0.9.0/env_logger/.
 
 ## Building difficulties
@@ -248,7 +249,7 @@ and building on Linux will also require `pkg-config`
 
 This can be done on Ubuntu  with: `$ apt-get install libssl-dev pkg-config`
 
-Note that building requires quite a lot of memory and out-of-memory errors might not be 
+Note that building requires quite a lot of memory and out-of-memory errors might not be
 obvious. It's recomended you only build these tools on machines with at least 2GB of RAM.
 
 ## Auto Compressor skips chunks when running on already compressed room
@@ -265,8 +266,8 @@ be a large problem.
 
 ## Compressor is trying to increase the number of rows
 
-Backfilling can lead to issues with compression. The auto_compressor will
+Backfilling can lead to issues with compression. The synapse_auto_compressor will
-skip chunks it can't reduce the size of and so this should help jump over the backfilled 
+skip chunks it can't reduce the size of and so this should help jump over the backfilled
 state_groups. Lots of state resolution might also impact the ability to use the compressor.
 
 To examine the state_group hierarchy run the manual tool on a room with the `-g` option

auto_compressor/Cargo.toml

@@ -1,30 +0,0 @@
-[package]
-name = "auto_compressor"
-authors = ["William Ashton"]
-version = "0.1.0"
-edition = "2018"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-clap = "2.33.0"
-openssl = "0.10.32"
-postgres = "0.19.0"
-postgres-openssl = "0.5.0"
-jemallocator = "0.3.2"
-rand = "0.8.0"
-serial_test = "0.5.1"
-synapse_compress_state = { path = "../", features = ["no-progress-bars"] }
-env_logger = "0.9.0"
-log = "0.4.14"
-log-panics = "2.0.0"
-anyhow = "1.0.42"
-pyo3-log = "0.4.0"
-
-# Needed for pyo3 support
-[lib]
-crate-type = ["cdylib", "rlib"]
-
-[dependencies.pyo3]
-version = "0.14.1"
-features = ["extension-module","abi3-py36"]

compressor_integration_tests/Cargo.toml

@@ -13,9 +13,9 @@ postgres = "0.19.0"
 postgres-openssl = "0.5.0"
 rand = "0.8.0"
 synapse_compress_state = { path = "../", features = ["no-progress-bars"] }
-auto_compressor = { path = "../auto_compressor/" }
+synapse_auto_compressor = { path = "../synapse_auto_compressor/" }
 env_logger = "0.9.0"
 log = "0.4.14"
 
 [dependencies.state-map]
-git = "https://github.com/matrix-org/rust-matrix-state-map"
+git = "https://github.com/matrix-org/rust-matrix-state-map"

compressor_integration_tests/src/lib.rs

@@ -179,7 +179,7 @@ fn collapse_state_with_database(state_group: i64) -> StateMap<Atom> {
     // the predecessor (so have split this into a different query)
     let query_pred = r#"
         SELECT prev_state_group
-        FROM state_group_edges 
+        FROM state_group_edges
         WHERE state_group = $1
     "#;
 
@@ -243,7 +243,7 @@ pub fn database_structure_matches_map(state_group_map: &BTreeMap<i64, StateGroup
     // the predecessor (so have split this into a different query)
     let query_pred = r#"
         SELECT prev_state_group
-        FROM state_group_edges 
+        FROM state_group_edges
         WHERE state_group = $1
     "#;
 
@@ -356,7 +356,7 @@ fn functions_are_self_consistent() {
 }
 
 pub fn setup_logger() {
-    // setup the logger for the auto_compressor
+    // setup the logger for the synapse_auto_compressor
     // The default can be overwritten with RUST_LOG
     // see the README for more information
     if env::var("RUST_LOG").is_err() {
@@ -366,7 +366,7 @@ pub fn setup_logger() {
         // default to printing the debug information for both packages being tested
         // (Note that just setting the global level to debug will log every sql transaction)
         log_builder.filter_module("synapse_compress_state", LevelFilter::Debug);
-        log_builder.filter_module("auto_compressor", LevelFilter::Debug);
+        log_builder.filter_module("synapse_auto_compressor", LevelFilter::Debug);
         // use try_init() incase the logger has been setup by some previous test
         let _ = log_builder.try_init();
     } else {

compressor_integration_tests/tests/auto_compressor_manager_tests.rs

@@ -1,9 +1,5 @@
 use std::collections::BTreeMap;
 
-use auto_compressor::{
-    manager::{compress_chunks_of_database, run_compressor_on_room_chunk},
-    state_saving::{connect_to_database, create_tables_if_needed},
-};
 use compressor_integration_tests::{
     add_contents_to_database, clear_compressor_state, database_collapsed_states_match_map,
     database_structure_matches_map, empty_database,
@@ -14,6 +10,10 @@ use compressor_integration_tests::{
     setup_logger, DB_URL,
 };
 use serial_test::serial;
+use synapse_auto_compressor::{
+    manager::{compress_chunks_of_database, run_compressor_on_room_chunk},
+    state_saving::{connect_to_database, create_tables_if_needed},
+};
 use synapse_compress_state::Level;
 
 #[test]

compressor_integration_tests/tests/auto_compressor_state_saving_tests.rs

@@ -1,9 +1,9 @@
-use auto_compressor::state_saving::{
+use compressor_integration_tests::{clear_compressor_state, setup_logger, DB_URL};
+use serial_test::serial;
+use synapse_auto_compressor::state_saving::{
     connect_to_database, create_tables_if_needed, read_room_compressor_state,
     write_room_compressor_state,
 };
-use compressor_integration_tests::{clear_compressor_state, setup_logger, DB_URL};
-use serial_test::serial;
 use synapse_compress_state::Level;
 
 #[test]

compressor_integration_tests/tests/compressor_config_tests.rs

@@ -46,10 +46,11 @@ fn run_succeeds_without_crashing() {
     let transactions = true;
     let graphs = false;
     let commit_changes = false;
+    let verify = true;
 
     let config = Config::new(
-        db_url.clone(),
+        db_url,
-        room_id.clone(),
+        room_id,
         output_file,
         min_state_group,
         groups_to_compress,
@@ -59,6 +60,7 @@ fn run_succeeds_without_crashing() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
@@ -94,6 +96,7 @@ fn changes_commited_if_no_min_saved_rows() {
     let transactions = true;
     let graphs = false;
     let commit_changes = true;
+    let verify = true;
 
     let config = Config::new(
         db_url,
@@ -107,6 +110,7 @@ fn changes_commited_if_no_min_saved_rows() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
@@ -160,6 +164,7 @@ fn changes_commited_if_min_saved_rows_exceeded() {
     let transactions = true;
     let graphs = false;
     let commit_changes = true;
+    let verify = true;
 
     let config = Config::new(
         db_url,
@@ -173,6 +178,7 @@ fn changes_commited_if_min_saved_rows_exceeded() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
@@ -227,6 +233,7 @@ fn changes_not_commited_if_fewer_than_min_saved_rows() {
     let transactions = true;
     let graphs = false;
     let commit_changes = true;
+    let verify = true;
 
     let config = Config::new(
         db_url,
@@ -240,6 +247,7 @@ fn changes_not_commited_if_fewer_than_min_saved_rows() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
@@ -280,6 +288,7 @@ fn run_panics_if_invalid_db_url() {
     let transactions = true;
     let graphs = false;
     let commit_changes = true;
+    let verify = true;
 
     let config = Config::new(
         db_url,
@@ -293,6 +302,7 @@ fn run_panics_if_invalid_db_url() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
@@ -336,6 +346,7 @@ fn run_only_affects_given_room_id() {
     let transactions = true;
     let graphs = false;
     let commit_changes = true;
+    let verify = true;
 
     let config = Config::new(
         db_url,
@@ -349,6 +360,7 @@ fn run_only_affects_given_room_id() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
@@ -406,6 +418,7 @@ fn run_respects_groups_to_compress() {
     let transactions = true;
     let graphs = false;
     let commit_changes = true;
+    let verify = true;
 
     let config = Config::new(
         db_url,
@@ -419,6 +432,7 @@ fn run_respects_groups_to_compress() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
@@ -492,6 +506,7 @@ fn run_is_idempotent_when_run_on_whole_room() {
     let transactions = true;
     let graphs = false;
     let commit_changes = true;
+    let verify = true;
 
     let config1 = Config::new(
         db_url.clone(),
@@ -505,21 +520,23 @@ fn run_is_idempotent_when_run_on_whole_room() {
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 
     let config2 = Config::new(
-        db_url.clone(),
+        db_url,
-        room_id.clone(),
+        room_id,
         output_file2,
         min_state_group,
         groups_to_compress,
         min_saved_rows,
         max_state_group,
-        level_sizes.clone(),
+        level_sizes,
         transactions,
         graphs,
         commit_changes,
+        verify,
     )
     .unwrap();
 

compressor_integration_tests/tests/compressor_continue_run_tests.rs

@@ -56,7 +56,7 @@ fn continue_run_called_twice_same_as_run() {
 
     let start = Some(6);
     let chunk_size = 7;
-    let level_info = chunk_stats_1.new_level_info.clone();
+    let level_info = chunk_stats_1.new_level_info;
 
     // Run the compressor with those settings
     let chunk_stats_2 = continue_run(start, chunk_size, &db_url, &room_id, &level_info).unwrap();

docs/python.md

@@ -18,7 +18,7 @@ the compressor is run.
 
 3. Navigate to the correct location  
 For the automatic tool:  
-`$ cd /home/synapse/rust-synapse-compress-state/auto_compressor`   
+`$ cd /home/synapse/rust-synapse-compress-state/synpase_auto_compressor`   
 For the manual tool:  
 `$ cd /home/synapse/rust-synapse-compress-state`   
 
@@ -30,9 +30,9 @@ This will install the relevant compressor tool into the activated virtual enviro
 ## Automatic tool example:
 
 ```python
-import auto_compressor
+import synapse_auto_compressor
 
-auto_compressor.compress_state_events_table(
+synapse_auto_compressor.compress_state_events_table(
   db_url="postgresql://localhost/synapse",
   chunk_size=500,
   default_levels="100,50,25",
@@ -51,4 +51,4 @@ synapse_compress_state.run_compression(
   output_file="out.sql",
   transactions=True
 )
-```
+```

src/compressor.rs

@@ -181,12 +181,11 @@ impl<'a> Compressor<'a> {
             panic!("Can only call `create_new_tree` once");
         }
 
-        let pb: ProgressBar;
+        let pb = if cfg!(feature = "no-progress-bars") {
-        if cfg!(feature = "no-progress-bars") {
+            ProgressBar::hidden()
-            pb = ProgressBar::hidden();
         } else {
-            pb = ProgressBar::new(self.original_state_map.len() as u64);
+            ProgressBar::new(self.original_state_map.len() as u64)
-        }
+        };
         pb.set_style(
             ProgressStyle::default_bar().template("[{elapsed_precise}] {bar} {pos}/{len} {msg}"),
         );

src/compressor/compressor_tests.rs

@@ -96,11 +96,7 @@ fn create_new_tree_does_nothing_if_already_compressed() {
         let pred_group = initial_edges.get(&i);
 
         // Need Option<i64> not Option<&i64>
-        let prev;
+        let prev = pred_group.copied();
-        match pred_group {
-            Some(i) => prev = Some(*i),
-            None => prev = None,
-        }
 
         // insert that edge into the initial map
         initial.insert(

src/compressor/level_tests.rs

@@ -54,7 +54,7 @@ fn get_head_returns_head() {
 #[test]
 fn has_space_returns_true_if_empty() {
     let l = Level::new(15);
-    assert_eq!(l.has_space(), true);
+    assert!(l.has_space());
 }
 
 #[test]
@@ -65,7 +65,7 @@ fn has_space_returns_true_if_part_full() {
     l.update(1, true);
     l.update(143, true);
     l.update(15, true);
-    assert_eq!(l.has_space(), true);
+    assert!(l.has_space());
 }
 
 #[test]
@@ -76,5 +76,5 @@ fn has_space_returns_false_if_full() {
     l.update(3, true);
     l.update(4, true);
     l.update(5, true);
-    assert_eq!(l.has_space(), false);
+    assert!(!l.has_space());
 }

src/compressor/stats_tests.rs

@@ -145,11 +145,7 @@ fn stats_correct_if_no_changes() {
         let pred_group = initial_edges.get(&i);
 
         // Need Option<i64> not Option<&i64>
-        let prev;
+        let prev = pred_group.copied();
-        match pred_group {
-            Some(i) => prev = Some(*i),
-            None => prev = None,
-        }
 
         // insert that edge into the initial map
         initial.insert(

src/database.rs

@@ -372,12 +372,11 @@ fn get_initial_data_from_db(
     // Copy the data from the database into a map
     let mut state_group_map: BTreeMap<i64, StateGroupEntry> = BTreeMap::new();
 
-    let pb: ProgressBar;
+    let pb = if cfg!(feature = "no-progress-bars") {
-    if cfg!(feature = "no-progress-bars") {
+        ProgressBar::hidden()
-        pb = ProgressBar::hidden();
     } else {
-        pb = ProgressBar::new_spinner();
+        ProgressBar::new_spinner()
-    }
+    };
     pb.set_style(
         ProgressStyle::default_spinner().template("{spinner} [{elapsed}] {pos} rows retrieved"),
     );
@@ -537,12 +536,11 @@ pub fn send_changes_to_db(
     debug!("Writing changes...");
 
     // setup the progress bar
-    let pb: ProgressBar;
+    let pb = if cfg!(feature = "no-progress-bars") {
-    if cfg!(feature = "no-progress-bars") {
+        ProgressBar::hidden()
-        pb = ProgressBar::hidden();
     } else {
-        pb = ProgressBar::new(old_map.len() as u64);
+        ProgressBar::new(old_map.len() as u64)
-    }
+    };
     pb.set_style(
         ProgressStyle::default_bar().template("[{elapsed_precise}] {bar} {pos}/{len} {msg}"),
     );

src/lib.rs

@@ -23,11 +23,11 @@
 use log::{info, warn, LevelFilter};
 use pyo3::{exceptions, prelude::*};
 
-use clap::{crate_authors, crate_description, crate_name, crate_version, value_t, App, Arg};
+use clap::{crate_authors, crate_description, crate_name, crate_version, Arg, Command};
 use indicatif::{ProgressBar, ProgressStyle};
 use rayon::prelude::*;
 use state_map::StateMap;
-use std::{collections::BTreeMap, fs::File, io::Write, str::FromStr};
+use std::{collections::BTreeMap, convert::TryInto, fs::File, io::Write, str::FromStr};
 use string_cache::DefaultAtom as Atom;
 
 mod compressor;
@@ -109,18 +109,21 @@ pub struct Config {
     // Whether or not to commit changes to the database automatically
     // N.B. currently assumes transactions is true (to be on the safe side)
     commit_changes: bool,
+    // Whether to verify the correctness of the compressed state groups by
+    // comparing them to the original groups
+    verify: bool,
 }
 
 impl Config {
     /// Build up config from command line arguments
     pub fn parse_arguments() -> Config {
-        let matches = App::new(crate_name!())
+        let matches = Command::new(crate_name!())
         .version(crate_version!())
         .author(crate_authors!("\n"))
         .about(crate_description!())
         .arg(
-            Arg::with_name("postgres-url")
+            Arg::new("postgres-url")
-                .short("p")
+                .short('p')
                 .value_name("POSTGRES_LOCATION")
                 .help("The configruation for connecting to the postgres database.")
                 .long_help(concat!(
@@ -133,8 +136,8 @@ impl Config {
                 .takes_value(true)
                 .required(true),
         ).arg(
-            Arg::with_name("room_id")
+            Arg::new("room_id")
-                .short("r")
+                .short('r')
                 .value_name("ROOM_ID")
                 .help("The room to process")
                 .long_help(concat!(
@@ -144,39 +147,39 @@ impl Config {
                 .takes_value(true)
                 .required(true),
         ).arg(
-            Arg::with_name("min_state_group")
+            Arg::new("min_state_group")
-                .short("b")
+                .short('b')
                 .value_name("MIN_STATE_GROUP")
                 .help("The state group to start processing from (non inclusive)")
                 .takes_value(true)
                 .required(false),
         ).arg(
-            Arg::with_name("min_saved_rows")
+            Arg::new("min_saved_rows")
-                .short("m")
+                .short('m')
                 .value_name("COUNT")
                 .help("Abort if fewer than COUNT rows would be saved")
                 .long_help("If the compressor cannot save this many rows from the database then it will stop early")
                 .takes_value(true)
                 .required(false),
         ).arg(
-            Arg::with_name("groups_to_compress")
+            Arg::new("groups_to_compress")
-                .short("n")
+                .short('n')
                 .value_name("GROUPS_TO_COMPRESS")
-                .help("How many groups to load into memory to compress") 
+                .help("How many groups to load into memory to compress")
                 .long_help(concat!(
                     "How many groups to load into memory to compress (starting from",
                     " the 1st group in the room or the group specified by -s)"))
                 .takes_value(true)
                 .required(false),
         ).arg(
-            Arg::with_name("output_file")
+            Arg::new("output_file")
-                .short("o")
+                .short('o')
                 .value_name("FILE")
                 .help("File to output the changes to in SQL")
                 .takes_value(true),
         ).arg(
-            Arg::with_name("max_state_group")
+            Arg::new("max_state_group")
-                .short("s")
+                .short('s')
                 .value_name("MAX_STATE_GROUP")
                 .help("The maximum state group to process up to")
                 .long_help(concat!(
@@ -185,8 +188,8 @@ impl Config {
                 .takes_value(true)
                 .required(false),
         ).arg(
-            Arg::with_name("level_sizes")
+            Arg::new("level_sizes")
-                .short("l")
+                .short('l')
                 .value_name("LEVELS")
                 .help("Sizes of each new level in the compression algorithm, as a comma separated list.")
                 .long_help(concat!(
@@ -202,27 +205,34 @@ impl Config {
                 .default_value("100,50,25")
                 .takes_value(true),
         ).arg(
-            Arg::with_name("transactions")
+            Arg::new("transactions")
-                .short("t")
+                .short('t')
                 .help("Whether to wrap each state group change in a transaction")
                 .long_help(concat!("If this flag is set then then each change to a particular",
                     " state group is wrapped in a transaction. This should be done if you wish to",
                     " apply the changes while synapse is still running."))
                 .requires("output_file"),
         ).arg(
-            Arg::with_name("graphs")
+            Arg::new("graphs")
-                .short("g")
+                .short('g')
                 .help("Output before and after graphs")
                 .long_help(concat!("If this flag is set then output the node and edge information for",
                     " the state_group directed graph built up from the predecessor state_group links.",
                     " These can be looked at in something like Gephi (https://gephi.org)")),
         ).arg(
-            Arg::with_name("commit_changes")
+            Arg::new("commit_changes")
-                .short("c")
+                .short('c')
                 .help("Commit changes to the database")
                 .long_help(concat!("If this flag is set then the changes the compressor makes will",
                     " be committed to the database. This should be safe to use while synapse is running",
                     " as it assumes by default that the transactions flag is set")),
+        ).arg(
+            Arg::new("no_verify")
+                .short('N')
+                .help("Do not double-check that the compression was performed correctly")
+                .long_help(concat!("If this flag is set then the verification of the compressed",
+                    " state groups, which compares them to the original groups, is skipped. This",
+                    " saves time at the cost of potentially generating mismatched state.")),
         ).get_matches();
 
         let db_url = matches
@@ -253,7 +263,8 @@ impl Config {
             .value_of("max_state_group")
             .map(|s| s.parse().expect("max_state_group must be an integer"));
 
-        let level_sizes = value_t!(matches, "level_sizes", LevelSizes)
+        let level_sizes = matches
+            .value_of_t::<LevelSizes>("level_sizes")
             .unwrap_or_else(|e| panic!("Unable to parse level_sizes: {}", e));
 
         let transactions = matches.is_present("transactions");
@@ -262,6 +273,8 @@ impl Config {
 
         let commit_changes = matches.is_present("commit_changes");
 
+        let verify = !matches.is_present("no_verify");
+
         Config {
             db_url: String::from(db_url),
             output_file,
@@ -274,6 +287,7 @@ impl Config {
             transactions,
             graphs,
             commit_changes,
+            verify,
         }
     }
 }
@@ -362,8 +376,8 @@ pub fn run(mut config: Config) {
     }
 
     if let Some(min) = config.min_saved_rows {
-        let saving = (original_summed_size - compressed_summed_size) as i32;
+        let saving = original_summed_size.saturating_sub(compressed_summed_size);
-        if saving < min {
+        if saving < min.try_into().unwrap_or(0) {
             warn!(
                 "Only {} rows would be saved by this compression. Skipping output.",
                 saving
@@ -372,7 +386,9 @@ pub fn run(mut config: Config) {
         }
     }
 
-    check_that_maps_match(&state_group_map, new_state_group_map);
+    if config.verify {
+        check_that_maps_match(&state_group_map, new_state_group_map);
+    }
 
     // If we are given an output file, we output the changes as SQL. If the
     // `transactions` argument is set we wrap each change to a state group in a
@@ -492,12 +508,11 @@ fn output_sql(
 
     info!("Writing changes...");
 
-    let pb: ProgressBar;
+    let pb = if cfg!(feature = "no-progress-bars") {
-    if cfg!(feature = "no-progress-bars") {
+        ProgressBar::hidden()
-        pb = ProgressBar::hidden();
     } else {
-        pb = ProgressBar::new(old_map.len() as u64);
+        ProgressBar::new(old_map.len() as u64)
-    }
+    };
     pb.set_style(
         ProgressStyle::default_bar().template("[{elapsed_precise}] {bar} {pos}/{len} {msg}"),
     );
@@ -607,12 +622,11 @@ fn check_that_maps_match(
 ) {
     info!("Checking that state maps match...");
 
-    let pb: ProgressBar;
+    let pb = if cfg!(feature = "no-progress-bars") {
-    if cfg!(feature = "no-progress-bars") {
+        ProgressBar::hidden()
-        pb = ProgressBar::hidden();
     } else {
-        pb = ProgressBar::new(old_map.len() as u64);
+        ProgressBar::new(old_map.len() as u64)
-    }
+    };
     pb.set_style(
         ProgressStyle::default_bar().template("[{elapsed_precise}] {bar} {pos}/{len} {msg}"),
     );
@@ -695,6 +709,7 @@ impl Config {
         transactions: bool,
         graphs: bool,
         commit_changes: bool,
+        verify: bool,
     ) -> Result<Config, String> {
         let mut output: Option<File> = None;
         if let Some(file) = output_file {
@@ -722,6 +737,7 @@ impl Config {
             transactions,
             graphs,
             commit_changes,
+            verify,
         })
     }
 }
@@ -746,6 +762,7 @@ impl Config {
     transactions = true,
     graphs = false,
     commit_changes = false,
+    verify = true,
 )]
 fn run_compression(
     db_url: String,
@@ -759,6 +776,7 @@ fn run_compression(
     transactions: bool,
     graphs: bool,
     commit_changes: bool,
+    verify: bool,
 ) -> PyResult<()> {
     let config = Config::new(
         db_url,
@@ -772,6 +790,7 @@ fn run_compression(
         transactions,
         graphs,
         commit_changes,
+        verify,
     );
     match config {
         Err(e) => Err(PyErr::new::<exceptions::PyException, _>(e)),
@@ -788,7 +807,7 @@ fn synapse_compress_state(_py: Python, m: &PyModule) -> PyResult<()> {
     let _ = pyo3_log::Logger::default()
         // don't send out anything lower than a warning from other crates
         .filter(LevelFilter::Warn)
-        // don't log warnings from synapse_compress_state, the auto_compressor handles these
+        // don't log warnings from synapse_compress_state, the synapse_auto_compressor handles these
         // situations and provides better log messages
         .filter_target("synapse_compress_state".to_owned(), LevelFilter::Debug)
         .install();
@@ -955,7 +974,6 @@ mod lib_tests {
     #[test]
     fn check_that_maps_match_returns_if_both_empty() {
         check_that_maps_match(&BTreeMap::new(), &BTreeMap::new());
-        assert!(true);
     }
 
     #[test]
@@ -988,7 +1006,6 @@ mod lib_tests {
         }
 
         check_that_maps_match(&old_map, &BTreeMap::new());
-        assert!(true);
     }
 
     #[test]
@@ -1024,7 +1041,6 @@ mod lib_tests {
         }
 
         check_that_maps_match(&BTreeMap::new(), &new_map);
-        assert!(true);
     }
 
     #[test]
@@ -1056,7 +1072,6 @@ mod lib_tests {
         }
 
         check_that_maps_match(&BTreeMap::new(), &old_map.clone());
-        assert!(true);
     }
 
     #[test]
@@ -1119,7 +1134,6 @@ mod lib_tests {
         }
 
         check_that_maps_match(&old_map, &new_map);
-        assert!(true);
     }
 
     #[test]
@@ -1201,7 +1215,6 @@ mod lib_tests {
         );
 
         check_that_maps_match(&old_map, &new_map);
-        assert!(true);
     }
 
     //TODO: tests for correct SQL code produced by output_sql
@@ -1224,6 +1237,7 @@ mod pyo3_tests {
         let transactions = false;
         let graphs = false;
         let commit_changes = false;
+        let verify = true;
 
         let config = Config::new(
             db_url.clone(),
@@ -1237,6 +1251,7 @@ mod pyo3_tests {
             transactions,
             graphs,
             commit_changes,
+            verify,
         )
         .unwrap();
 
@@ -1270,6 +1285,7 @@ mod pyo3_tests {
         let transactions = true;
         let graphs = true;
         let commit_changes = true;
+        let verify = true;
 
         let config = Config::new(
             db_url.clone(),
@@ -1283,11 +1299,12 @@ mod pyo3_tests {
             transactions,
             graphs,
             commit_changes,
+            verify,
         )
         .unwrap();
 
         assert_eq!(config.db_url, db_url);
-        assert!(!config.output_file.is_none());
+        assert!(config.output_file.is_some());
         assert_eq!(config.room_id, room_id);
         assert_eq!(config.min_state_group, Some(3225));
         assert_eq!(config.groups_to_compress, Some(970));

src/main.rs

@@ -18,7 +18,7 @@
 
 #[cfg(feature = "jemalloc")]
 #[global_allocator]
-static GLOBAL: jemallocator::Jemalloc = jemallocator::Jemalloc;
+static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
 
 use log::LevelFilter;
 use std::env;

synapse_auto_compressor/Cargo.toml

@@ -0,0 +1,39 @@
+[package]
+name = "synapse_auto_compressor"
+authors = ["William Ashton"]
+version = "0.1.3"
+edition = "2018"
+
+[package.metadata.maturin]
+requires-python = ">=3.7"
+project-url = {Source = "https://github.com/matrix-org/rust-synapse-compress-state"}
+classifier = [
+    "Development Status :: 4 - Beta",
+    "Programming Language :: Rust",
+]
+
+[dependencies]
+openssl = "0.10.32"
+postgres = "0.19.0"
+postgres-openssl = "0.5.0"
+tikv-jemallocator = "0.5.0"
+rand = "0.8.0"
+serial_test = "0.5.1"
+synapse_compress_state = { path = "../", features = ["no-progress-bars"] }
+env_logger = "0.9.0"
+log = "0.4.14"
+log-panics = "2.0.0"
+anyhow = "1.0.42"
+pyo3-log = "0.6.0"
+
+# Needed for pyo3 support
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies.clap]
+version = "3.1.14"
+features = ["cargo"]
+
+[dependencies.pyo3]
+version = "0.16.4"
+features = ["extension-module"]

synapse_auto_compressor/README.md

@@ -0,0 +1,12 @@
+# Auto Compressor
+
+See the top level readme for information.
+
+
+## Publishing to PyPI
+
+Bump the version number and run from the root directory of the repo:
+
+```
+docker run -it --rm -v $(pwd):/io -e OPENSSL_STATIC=1 konstin2/maturin publish -m synapse_auto_compressor/Cargo.toml --cargo-extra-args "\--features='openssl/vendored'"
+```

synapse_auto_compressor/src/lib.rs

@@ -57,15 +57,16 @@ impl FromStr for LevelInfo {
 
 // PyO3 INTERFACE STARTS HERE
 #[pymodule]
-fn auto_compressor(_py: Python, m: &PyModule) -> PyResult<()> {
+fn synapse_auto_compressor(_py: Python, m: &PyModule) -> PyResult<()> {
     let _ = pyo3_log::Logger::default()
         // don't send out anything lower than a warning from other crates
         .filter(LevelFilter::Warn)
-        // don't log warnings from synapse_compress_state, the auto_compressor handles these
+        // don't log warnings from synapse_compress_state, the
-        // situations and provides better log messages
+        // synapse_auto_compressor handles these situations and provides better
+        // log messages
         .filter_target("synapse_compress_state".to_owned(), LevelFilter::Error)
-        // log info and above for the auto_compressor
+        // log info and above for the synapse_auto_compressor
-        .filter_target("auto_compressor".to_owned(), LevelFilter::Debug)
+        .filter_target("synapse_auto_compressor".to_owned(), LevelFilter::Debug)
         .install();
     // ensure any panics produce error messages in the log
     log_panics::init();
@@ -92,7 +93,7 @@ fn auto_compressor(_py: Python, m: &PyModule) -> PyResult<()> {
         number_of_chunks: i64,
     ) -> PyResult<()> {
         // Announce the start of the program to the logs
-        log::info!("auto_compressor started");
+        log::info!("synapse_auto_compressor started");
 
         // Parse the default_level string into a LevelInfo struct
         let default_levels: LevelInfo = match default_levels.parse() {
@@ -120,7 +121,7 @@ fn auto_compressor(_py: Python, m: &PyModule) -> PyResult<()> {
             return Err(PyErr::new::<PyRuntimeError, _>(format!("{:?}", e)));
         }
 
-        log::info!("auto_compressor finished");
+        log::info!("synapse_auto_compressor finished");
         Ok(())
     }
     Ok(())

synapse_auto_compressor/src/main.rs

@@ -17,53 +17,46 @@
 //! continue from where it left off.
 
 #[global_allocator]
-static GLOBAL: jemallocator::Jemalloc = jemallocator::Jemalloc;
+static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
 
-use auto_compressor::{manager, state_saving, LevelInfo};
+use clap::{crate_authors, crate_description, crate_name, crate_version, Arg, Command};
-use clap::{crate_authors, crate_description, crate_name, crate_version, value_t, App, Arg};
 use log::LevelFilter;
-use std::{env, fs::OpenOptions};
+use std::env;
+use synapse_auto_compressor::{manager, state_saving, LevelInfo};
 
 /// Execution starts here
 fn main() {
-    // setup the logger for the auto_compressor
+    // setup the logger for the synapse_auto_compressor
     // The default can be overwritten with RUST_LOG
     // see the README for more information
-    let log_file = OpenOptions::new()
-        .append(true)
-        .create(true)
-        .open("auto_compressor.log")
-        .unwrap_or_else(|e| panic!("Error occured while opening the log file: {}", e));
-
     if env::var("RUST_LOG").is_err() {
         let mut log_builder = env_logger::builder();
         // Ensure panics still come through
         log_builder.filter_module("panic", LevelFilter::Error);
         // Only output errors from the synapse_compress state library
         log_builder.filter_module("synapse_compress_state", LevelFilter::Error);
-        // Output log levels info and above from auto_compressor
+        // Output log levels info and above from synapse_auto_compressor
-        log_builder.filter_module("auto_compressor", LevelFilter::Info);
+        log_builder.filter_module("synapse_auto_compressor", LevelFilter::Info);
         log_builder.init();
     } else {
         // If RUST_LOG was set then use that
         let mut log_builder = env_logger::Builder::from_env("RUST_LOG");
-        log_builder.target(env_logger::Target::Pipe(Box::new(log_file)));
         // Ensure panics still come through
         log_builder.filter_module("panic", LevelFilter::Error);
         log_builder.init();
     }
     log_panics::init();
     // Announce the start of the program to the logs
-    log::info!("auto_compressor started");
+    log::info!("synapse_auto_compressor started");
 
     // parse the command line arguments using the clap crate
-    let arguments = App::new(crate_name!())
+    let arguments = Command::new(crate_name!())
         .version(crate_version!())
         .author(crate_authors!("\n"))
         .about(crate_description!())
         .arg(
-            Arg::with_name("postgres-url")
+            Arg::new("postgres-url")
-                .short("p")
+                .short('p')
                 .value_name("POSTGRES_LOCATION")
                 .help("The configruation for connecting to the postgres database.")
                 .long_help(concat!(
@@ -76,8 +69,8 @@ fn main() {
                 .takes_value(true)
                 .required(true),
         ).arg(
-            Arg::with_name("chunk_size")
+            Arg::new("chunk_size")
-                .short("c")
+                .short('c')
                 .value_name("COUNT")
                 .help("The maximum number of state groups to load into memroy at once")
                 .long_help(concat!(
@@ -92,8 +85,8 @@ fn main() {
                 .takes_value(true)
                 .required(true),
         ).arg(
-            Arg::with_name("default_levels")
+            Arg::new("default_levels")
-                .short("l")
+                .short('l')
                 .value_name("LEVELS")
                 .help("Sizes of each new level in the compression algorithm, as a comma separated list.")
                 .long_help(concat!(
@@ -110,10 +103,10 @@ fn main() {
                 .takes_value(true)
                 .required(false),
         ).arg(
-            Arg::with_name("number_of_chunks")
+            Arg::new("number_of_chunks")
-                .short("n")
+                .short('n')
                 .value_name("CHUNKS_TO_COMPRESS")
-                .help("The number of chunks to compress") 
+                .help("The number of chunks to compress")
                 .long_help(concat!(
                     "This many chunks of the database will be compressed. The higher this number is set to, ",
                     "the longer the compressor will run for."
@@ -134,7 +127,8 @@ fn main() {
         .expect("A chunk size is required");
 
     // The default structure to use when compressing
-    let default_levels = value_t!(arguments, "default_levels", LevelInfo)
+    let default_levels = arguments
+        .value_of_t::<LevelInfo>("default_levels")
         .unwrap_or_else(|e| panic!("Unable to parse default levels: {}", e));
 
     // The number of rooms to compress with this tool
@@ -155,5 +149,5 @@ fn main() {
     manager::compress_chunks_of_database(db_url, chunk_size, &default_levels.0, number_of_chunks)
         .unwrap();
 
-    log::info!("auto_compressor finished");
+    log::info!("synapse_auto_compressor finished");
 }