From 1fa6155b227e9a20f8c351cc55d310bc0b490f63 Mon Sep 17 00:00:00 2001 From: "Dustin J. Mitchell" Date: Sat, 21 Nov 2020 18:01:00 -0500 Subject: [PATCH] rename to taskchampion --- Cargo.lock | 484 ++++++++++++------------- Cargo.toml | 2 +- README.md | 113 +----- docs/development-notes.md | 106 ++++++ src/bin/task.rs | 2 +- tests/operation_transform_invariant.rs | 2 +- tests/sync.rs | 2 +- tests/sync_action_sequences.rs | 2 +- 8 files changed, 360 insertions(+), 353 deletions(-) create mode 100644 docs/development-notes.md diff --git a/Cargo.lock b/Cargo.lock index 2aa865cc7..61a97dabe 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -4,754 +4,752 @@ name = "ansi_term" version = "0.11.0" source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b" dependencies = [ - "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)", + "winapi", ] [[package]] name = "atty" version = "0.2.13" source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = 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["Dustin J. Mitchell "] edition = "2018" diff --git a/README.md b/README.md index 313270718..2ced65b38 100644 --- a/README.md +++ b/README.md @@ -1,108 +1,11 @@ -Sketch for a Taskd Replacement ------------------------------- +TaskChampion +------------ -Goals: +TaskChampion is an open-source personal task-tracking application. +Use it to keep track of what you need to do, with a quick command-line interface and flexible sorting and filtering. +It is modeled on [TaskWarrior](https://taskwarrior.org), but not a drop-in replacement for that application. - * Reasonable privacy: user's task details not visible on server - * Reliable concurrency - clients do not diverge - * Storage O(n) with n number of tasks +See: -# Data Model - -A client manages a single offline instance of a single user's task list. -The data model is only seen from the clients' perspective. - -## Task Database - -The task database is composed of an un-ordered collection of tasks, each keyed by a UUID. -Each task has an arbitrary-sized set of key/value properties, with string values. - -Tasks are only created, never deleted. -See below for details on how tasks can "expire" from the task database. - -## Operations - -Every change to the task database is captured as an operation. -Each operation has one of the forms - * `Create(uuid)` - * `Delete(uuid)` - * `Update(uuid, property, value, timestamp)` - -The Create form creates a new task. -It is invalid to create a task that already exists. - -Similarly, the Delete form deletes an existing task. -It is invalid to delete a task that does not exist. - -The Update form updates the given property of the given task, where property and value are both strings. -Value can also be `None` to indicate deletion of a property. -It is invalid to update a task that does not exist. -The timestamp on updates serves as additional metadata and is used to resolve conflicts. - -Operations act as deltas between database states. - -## Versions and Synchronization - -Occasionally, database states are named with an integer, called a version. -The system as a whole (server and clients) constructs a monotonic sequence of versions and the operations that separate each version from the next. -No gaps are allowed in the verison numbering. -Version 0 is implicitly the empty database. - -The server stores the operations for each version, and provides them as needed to clients. -Clients use this information to update their local task databases, and to generate new versions to send to the server. - -Clients generate a new version to transmit changes made locally to the server. -The changes are represented as a sequence of operations with the final operation being tagged as the version. -In order to keep the gap-free monotonic numbering, the server will only accept a proposed version from a client if its number is one greater that the latest version on the server. -When this is not the case, the client must "rebase" the local changes onto the latest version from the server and try again. -This operation is performed using operational transformation (OT). -The result of this transformation is a sequence of operations based on the latest version, and a sequence of operations the client can apply to its local task database to "catch up" to the version on the server. - -## Snapshots - -As designed, storage required on the server would grow with time, as would the time required for new clients to update to the latest version. -As an optimization, the server also stores "snapshots" containing a full copy of the task database at a given version. -Based on configurable heuristics, it may delete older operations and snapshots, as long as enough data remains for active clients to synchronize and for new clients to initialize. - -Since snapshots must be computed by clients, the server may "request" a snapshot when providing the latest version to a client. -This request comes with a number indicating how much it 'wants" the snapshot. -Clients which can easily generate and transmit a snapshot should be generous to the server, while clients with more limited resources can wait until the server's requests are more desperate. -The intent is, where possible, to request snapshots created on well-connected desktop clients over mobile and low-power clients. - -## Encryption and Signing - -From the server's perspective, all data except for version numbers are opaque binary blobs. -Clients encrypt and sign these blobs using a symmetric key known only to the clients. -This secures the data at-rest on the server. -Note that privacy is not complete, as the server still has some information about users, including source and frequency of synchronization transactions and size of those transactions. - -## Backups - -In this design, the server is little more than an authenticated storage for encrypted blobs provided by the client. -To allow for failure or data loss on the server, clients are expected to cache these blobs locally for a short time (a week), along with a server-provided HMAC signature. -When data loss is detected -- such as when a client expects the server to have a version N or higher, and the server only has N-1, the client can send those blobs to the server. -The server can validate the HMAC and, if successful, add the blobs to its datastore. - -## Expiration - -TBD - -.. conditions on flushing to allow consistent handling - -# Implementation Notes - -## Client / Server Protocol - -TBD - -.. using HTTP -.. user auth -.. user setup process - -## Batching Operations - -TBD - -## Recurrence - -TBD + * [Development Notes](docs/development-notes.md) + * [Progress on the first version](https://github.com/djmitche/taskwarrior-rust/projects/1) diff --git a/docs/development-notes.md b/docs/development-notes.md new file mode 100644 index 000000000..24f5d87b6 --- /dev/null +++ b/docs/development-notes.md @@ -0,0 +1,106 @@ +Goals: + + * Reasonable privacy: user's task details not visible on server + * Reliable concurrency - clients do not diverge + * Storage O(n) with n number of tasks + +# Data Model + +A client manages a single offline instance of a single user's task list. +The data model is only seen from the clients' perspective. + +## Task Database + +The task database is composed of an un-ordered collection of tasks, each keyed by a UUID. +Each task has an arbitrary-sized set of key/value properties, with string values. + +Tasks are only created, never deleted. +See below for details on how tasks can "expire" from the task database. + +## Operations + +Every change to the task database is captured as an operation. +Each operation has one of the forms + * `Create(uuid)` + * `Delete(uuid)` + * `Update(uuid, property, value, timestamp)` + +The Create form creates a new task. +It is invalid to create a task that already exists. + +Similarly, the Delete form deletes an existing task. +It is invalid to delete a task that does not exist. + +The Update form updates the given property of the given task, where property and value are both strings. +Value can also be `None` to indicate deletion of a property. +It is invalid to update a task that does not exist. +The timestamp on updates serves as additional metadata and is used to resolve conflicts. + +Operations act as deltas between database states. + +## Versions and Synchronization + +Occasionally, database states are named with an integer, called a version. +The system as a whole (server and clients) constructs a monotonic sequence of versions and the operations that separate each version from the next. +No gaps are allowed in the verison numbering. +Version 0 is implicitly the empty database. + +The server stores the operations for each version, and provides them as needed to clients. +Clients use this information to update their local task databases, and to generate new versions to send to the server. + +Clients generate a new version to transmit changes made locally to the server. +The changes are represented as a sequence of operations with the final operation being tagged as the version. +In order to keep the gap-free monotonic numbering, the server will only accept a proposed version from a client if its number is one greater that the latest version on the server. +When this is not the case, the client must "rebase" the local changes onto the latest version from the server and try again. +This operation is performed using operational transformation (OT). +The result of this transformation is a sequence of operations based on the latest version, and a sequence of operations the client can apply to its local task database to "catch up" to the version on the server. + +## Snapshots + +As designed, storage required on the server would grow with time, as would the time required for new clients to update to the latest version. +As an optimization, the server also stores "snapshots" containing a full copy of the task database at a given version. +Based on configurable heuristics, it may delete older operations and snapshots, as long as enough data remains for active clients to synchronize and for new clients to initialize. + +Since snapshots must be computed by clients, the server may "request" a snapshot when providing the latest version to a client. +This request comes with a number indicating how much it 'wants" the snapshot. +Clients which can easily generate and transmit a snapshot should be generous to the server, while clients with more limited resources can wait until the server's requests are more desperate. +The intent is, where possible, to request snapshots created on well-connected desktop clients over mobile and low-power clients. + +## Encryption and Signing + +From the server's perspective, all data except for version numbers are opaque binary blobs. +Clients encrypt and sign these blobs using a symmetric key known only to the clients. +This secures the data at-rest on the server. +Note that privacy is not complete, as the server still has some information about users, including source and frequency of synchronization transactions and size of those transactions. + +## Backups + +In this design, the server is little more than an authenticated storage for encrypted blobs provided by the client. +To allow for failure or data loss on the server, clients are expected to cache these blobs locally for a short time (a week), along with a server-provided HMAC signature. +When data loss is detected -- such as when a client expects the server to have a version N or higher, and the server only has N-1, the client can send those blobs to the server. +The server can validate the HMAC and, if successful, add the blobs to its datastore. + +## Expiration + +TBD + +.. conditions on flushing to allow consistent handling + +# Implementation Notes + +## Client / Server Protocol + +TBD + +.. using HTTP +.. user auth +.. user setup process + +## Batching Operations + +TBD + +## Recurrence + +TBD + diff --git a/src/bin/task.rs b/src/bin/task.rs index c2affafda..b816bcc3c 100644 --- a/src/bin/task.rs +++ b/src/bin/task.rs @@ -1,7 +1,7 @@ extern crate clap; use clap::{App, Arg, SubCommand}; use std::path::Path; -use taskwarrior_rust::{taskstorage, Replica, Status, DB}; +use taskchampion::{taskstorage, Replica, Status, DB}; use uuid::Uuid; fn main() { diff --git a/tests/operation_transform_invariant.rs b/tests/operation_transform_invariant.rs index 4a588d707..461aba009 100644 --- a/tests/operation_transform_invariant.rs +++ b/tests/operation_transform_invariant.rs @@ -1,6 +1,6 @@ use chrono::Utc; use proptest::prelude::*; -use taskwarrior_rust::{taskstorage, Operation, DB}; +use taskchampion::{taskstorage, Operation, DB}; use uuid::Uuid; fn newdb() -> DB { diff --git a/tests/sync.rs b/tests/sync.rs index b3f73f6de..fc594bbd3 100644 --- a/tests/sync.rs +++ b/tests/sync.rs @@ -1,5 +1,5 @@ use chrono::Utc; -use taskwarrior_rust::{taskstorage, Operation, Server, DB}; +use taskchampion::{taskstorage, Operation, Server, DB}; use uuid::Uuid; fn newdb() -> DB { diff --git a/tests/sync_action_sequences.rs b/tests/sync_action_sequences.rs index ddc8d328c..741988b11 100644 --- a/tests/sync_action_sequences.rs +++ b/tests/sync_action_sequences.rs @@ -1,6 +1,6 @@ use chrono::Utc; use proptest::prelude::*; -use taskwarrior_rust::{taskstorage, Operation, Server, DB}; +use taskchampion::{taskstorage, Operation, Server, DB}; use uuid::Uuid; fn newdb() -> DB {