The Great Refactor (part I): make SMS handling actually manageable

- Messages now get shoved into the DB before anything else, meaning
  we never drop 'em on the floor. (fixes #14)
- SMS->Matrix handling has been completely reworked. Now, we create
  a UserManager (through the RecipientFactory) for each phone number,
  which can be prodded in order to make it get messages from the DB
  and deliver them. (fixes #13)
- Message delivery is now actually failure-tolerant as well!
  We do an exponential backoff for failures to deliver.
- We now do regular CMGLs if configured, and also if an earlier one
  failed to work completely. This can be configured with the cmgl_secs
  value in the configuration. (fixes #8)
- Modems without CNMI support now work with the above polling mechanism.
- We now use newer versions of glitch-in-the-matrix and huawei-modem.

Cargo.toml

@@ -3,12 +3,6 @@ authors = ["eeeeeta <eeeeeta@users.noreply.github.com>"]
 name = "matrix-appservice-sms"
 version = "0.1.0"
 
-[profile.dev]
-panic = "abort"
-
-[profile.release]
-panic = "abort"
-
 [dependencies]
 dotenv = "0.9"
 env_logger = "0.5"
@@ -23,6 +17,7 @@ serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
 tokio-core = "0.1"
+tokio-timer = "0.2"
 
 [dependencies.diesel]
 features = ["postgres"]
@@ -32,8 +27,16 @@ version = "1.0"
 git = "https://github.com/alexcrichton/futures-await"
 
 [dependencies.glitch-in-the-matrix]
-git = "https://github.com/eeeeeta/glitch-in-the-matrix"
 branch = "develop"
+git = "https://github.com/eeeeeta/glitch-in-the-matrix"
 
 [dependencies.huawei-modem]
 git = "https://github.com/eeeeeta/huawei-modem"
+
+[profile]
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"

migrations/20180524130627_messages/down.sql

@@ -0,0 +1 @@
+DROP TABLE messages;

migrations/20180524130627_messages/up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE messages (
+	id SERIAL PRIMARY KEY,
+	recipient_id INT REFERENCES recipients ON DELETE CASCADE,
+	pdu bytea NOT NULL,
+	processing BOOL NOT NULL DEFAULT false,
+	failures INT NOT NULL DEFAULT 0
+);