Switch to Redis from MongoDB for event broker.

Closes #1.

Cargo.lock

@@ -138,6 +138,23 @@ dependencies = [
  "event-listener",
 ]
 
+[[package]]
+name = "async-process"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b21b63ab5a0db0369deb913540af2892750e42d949faacc7a61495ac418a1692"
+dependencies = [
+ "async-io",
+ "blocking",
+ "cfg-if 1.0.0",
+ "event-listener",
+ "futures-lite",
+ "libc",
+ "once_cell",
+ "signal-hook",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "async-std"
 version = "1.10.0"
@@ -149,6 +166,7 @@ dependencies = [
  "async-global-executor",
  "async-io",
  "async-lock",
+ "async-process",
  "crossbeam-utils",
  "futures-channel",
  "futures-core",
@@ -492,6 +510,20 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "combine"
+version = "4.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a909e4d93292cd8e9c42e189f61681eff9d67b6541f96b8a1a737f23737bd001"
+dependencies = [
+ "bytes 1.1.0",
+ "futures-core",
+ "memchr",
+ "pin-project-lite 0.2.7",
+ "tokio 1.11.0",
+ "tokio-util 0.6.8",
+]
+
 [[package]]
 name = "concurrent-queue"
 version = "1.2.2"
@@ -733,6 +765,12 @@ version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
 
+[[package]]
+name = "dtoa"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56899898ce76aaf4a0f24d914c97ea6ed976d42fec6ad33fcbb0a1103e07b2b0"
+
 [[package]]
 name = "either"
 version = "1.6.1"
@@ -978,6 +1016,12 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d3d00f4eddb73e498a54394f228cd55853bdf059259e8e7bc6e69d408892e99"
 
+[[package]]
+name = "futures-timer"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e64b03909df88034c26dc1547e8970b91f98bdb65165d6a4e9110d94263dbb2c"
+
 [[package]]
 name = "futures-util"
 version = "0.3.17"
@@ -1163,12 +1207,14 @@ checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "hive_pubsub"
-version = "0.4.4"
-source = "git+https://gitlab.insrt.uk/insert/hive?rev=a89826df2b30166220e68a6ed01a58b751456604#a89826df2b30166220e68a6ed01a58b751456604"
+version = "0.5.0"
+source = "git+https://gitlab.insrt.uk/insert/hive?rev=b0f3db9d33990530d7640d4bbb309c8d9eb5c0cf#b0f3db9d33990530d7640d4bbb309c8d9eb5c0cf"
 dependencies = [
  "futures",
  "many-to-many",
- "mongodb",
+ "mobc",
+ "mobc-redis",
+ "redis 0.21.2",
  "serde",
  "serde_json",
  "ulid",
@@ -1692,6 +1738,32 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "mobc"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f76d2f2e2dcbb00a8d3b2b09f026a74a82693ea52cd071647aa6cfa7f1ff37e"
+dependencies = [
+ "async-std",
+ "async-trait",
+ "futures-channel",
+ "futures-core",
+ "futures-timer",
+ "futures-util",
+ "log",
+ "tokio 1.11.0",
+]
+
+[[package]]
+name = "mobc-redis"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7b5db77b37c9224d5b9949b214041ea3e1c15b6b1e5dd24a5acb8e73975d6d6"
+dependencies = [
+ "mobc",
+ "redis 0.19.0",
+]
+
 [[package]]
 name = "mongodb"
 version = "1.2.3"
@@ -2516,6 +2588,48 @@ dependencies = [
  "rand_core 0.3.1",
 ]
 
+[[package]]
+name = "redis"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a6ddfecac9391fed21cce10e83c65fa4abafd77df05c98b1c647c65374ce9b3"
+dependencies = [
+ "async-std",
+ "async-trait",
+ "bytes 1.1.0",
+ "combine",
+ "dtoa",
+ "futures-util",
+ "itoa",
+ "percent-encoding",
+ "pin-project-lite 0.2.7",
+ "sha1",
+ "tokio 1.11.0",
+ "tokio-util 0.6.8",
+ "url",
+]
+
+[[package]]
+name = "redis"
+version = "0.21.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "202c5bf92cad3d57605c366e644a7fbf305a83f19754fc66678c6265dcc9b8b4"
+dependencies = [
+ "async-std",
+ "async-trait",
+ "bytes 1.1.0",
+ "combine",
+ "dtoa",
+ "futures-util",
+ "itoa",
+ "percent-encoding",
+ "pin-project-lite 0.2.7",
+ "sha1",
+ "tokio 1.11.0",
+ "tokio-util 0.6.8",
+ "url",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.2.10"
@@ -2673,12 +2787,15 @@ dependencies = [
  "linkify",
  "log",
  "many-to-many",
+ "mobc",
+ "mobc-redis",
  "mongodb",
  "nanoid",
  "num_enum",
  "once_cell",
  "phf",
  "rauth",
+ "redis 0.21.2",
  "regex",
  "reqwest 0.11.4",
  "rmp-serde",
@@ -3094,6 +3211,16 @@ dependencies = [
  "opaque-debug 0.3.0",
 ]
 
+[[package]]
+name = "signal-hook"
+version = "0.3.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c98891d737e271a2954825ef19e46bd16bdb98e2746f2eec4f7a4ef7946efd1"
+dependencies = [
+ "libc",
+ "signal-hook-registry",
+]
+
 [[package]]
 name = "signal-hook-registry"
 version = "1.4.0"