From 1418e5d760a093c525c78cdd8dfc74d59825210f Mon Sep 17 00:00:00 2001
From: Rouven Hi <rouven@himmelstein.info>
Date: Sun, 13 Feb 2022 20:11:00 +0100
Subject: [PATCH] feat: added request cache

---
 Cargo.lock                  | 501 ++++++++++++++++++++++++++++++++++--
 Cargo.toml                  |   1 +
 src/image_processor_test.rs |   2 +-
 src/main.rs                 |   5 +-
 src/resource_endpoint.rs    |  46 +++-
 src/scheduler.rs            |   2 +-
 6 files changed, 528 insertions(+), 29 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index d1e483e..a83ef31 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -69,7 +69,7 @@ dependencies = [
  "actix-service",
  "actix-threadpool",
  "actix-utils",
- "base64",
+ "base64 0.13.0",
  "bitflags",
  "brotli2",
  "bytes 0.5.6",
@@ -99,7 +99,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_urlencoded",
- "sha-1",
+ "sha-1 0.9.8",
  "slab",
  "time 0.2.27",
 ]
@@ -322,6 +322,135 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "async-channel"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2114d64672151c0c5eaa5e131ec84a74f06e1e559830dabba01ca30605d66319"
+dependencies = [
+ "concurrent-queue",
+ "event-listener",
+ "futures-core",
+]
+
+[[package]]
+name = "async-executor"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "871f9bb5e0a22eeb7e8cf16641feb87c9dc67032ccf8ff49e772eb9941d3a965"
+dependencies = [
+ "async-task",
+ "concurrent-queue",
+ "fastrand",
+ "futures-lite",
+ "once_cell",
+ "slab",
+]
+
+[[package]]
+name = "async-global-executor"
+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9586ec52317f36de58453159d48351bc244bc24ced3effc1fce22f3d48664af6"
+dependencies = [
+ "async-channel",
+ "async-executor",
+ "async-io",
+ "async-mutex",
+ "blocking",
+ "futures-lite",
+ "num_cpus",
+ "once_cell",
+]
+
+[[package]]
+name = "async-io"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a811e6a479f2439f0c04038796b5cfb3d2ad56c230e0f2d3f7b04d68cfee607b"
+dependencies = [
+ "concurrent-queue",
+ "futures-lite",
+ "libc",
+ "log",
+ "once_cell",
+ "parking",
+ "polling",
+ "slab",
+ "socket2 0.4.2",
+ "waker-fn",
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "async-lock"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6a8ea61bf9947a1007c5cada31e647dbc77b103c679858150003ba697ea798b"
+dependencies = [
+ "event-listener",
+]
+
+[[package]]
+name = "async-mutex"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "479db852db25d9dbf6204e6cb6253698f175c15726470f78af0d918e99d6156e"
+dependencies = [
+ "event-listener",
+]
+
+[[package]]
+name = "async-process"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83137067e3a2a6a06d67168e49e68a0957d215410473a740cea95a2425c0b7c6"
+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"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8056f1455169ab86dd47b47391e4ab0cbd25410a70e9fe675544f49bafaf952"
+dependencies = [
+ "async-channel",
+ "async-global-executor",
+ "async-io",
+ "async-lock",
+ "async-process",
+ "crossbeam-utils",
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-lite",
+ "gloo-timers",
+ "kv-log-macro",
+ "log",
+ "memchr",
+ "num_cpus",
+ "once_cell",
+ "pin-project-lite 0.2.8",
+ "pin-utils",
+ "slab",
+ "wasm-bindgen-futures",
+]
+
+[[package]]
+name = "async-task"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d306121baf53310a3fd342d88dc0824f6bbeace68347593658525565abee8"
+
 [[package]]
 name = "async-trait"
 version = "0.1.52"
@@ -333,6 +462,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "atomic-waker"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "065374052e7df7ee4047b1160cca5e1467a12351a40b3da123c870ba0b8eda2a"
+
 [[package]]
 name = "autocfg"
 version = "1.0.1"
@@ -349,7 +484,7 @@ dependencies = [
  "actix-http",
  "actix-rt",
  "actix-service",
- "base64",
+ "base64 0.13.0",
  "bytes 0.5.6",
  "cfg-if 1.0.0",
  "derive_more",
@@ -369,6 +504,15 @@ version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4521f3e3d031370679b3b140beb36dfe4801b09ac77e30c61941f97df3ef28b"
 
+[[package]]
+name = "base64"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "base64"
 version = "0.13.0"
@@ -381,13 +525,48 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "block-buffer"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
+dependencies = [
+ "block-padding",
+ "byte-tools",
+ "byteorder",
+ "generic-array 0.12.4",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
 dependencies = [
- "generic-array",
+ "generic-array 0.14.5",
+]
+
+[[package]]
+name = "block-padding"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
+dependencies = [
+ "byte-tools",
+]
+
+[[package]]
+name = "blocking"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "046e47d4b2d391b1f6f8b407b1deb8dee56c1852ccd868becf2710f601b5f427"
+dependencies = [
+ "async-channel",
+ "async-task",
+ "atomic-waker",
+ "fastrand",
+ "futures-lite",
+ "once_cell",
 ]
 
 [[package]]
@@ -425,6 +604,12 @@ version = "3.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4a45a46ab1f2412e53d3a0ade76ffad2025804294569aae387231a0cd6e0899"
 
+[[package]]
+name = "byte-tools"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
+
 [[package]]
 name = "bytemuck"
 version = "1.7.3"
@@ -458,6 +643,35 @@ dependencies = [
  "bytes 1.1.0",
 ]
 
+[[package]]
+name = "cacache"
+version = "10.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a4ae3b2af64ab1dc8c05c412bd5e900f0536c1ae6caa7a48171d4726d85dda0"
+dependencies = [
+ "async-std",
+ "digest 0.9.0",
+ "either",
+ "futures",
+ "hex 0.4.3",
+ "memmap2",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "sha-1 0.9.8",
+ "sha2 0.9.9",
+ "ssri",
+ "tempfile",
+ "thiserror",
+ "walkdir",
+]
+
+[[package]]
+name = "cache-padded"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1db59621ec70f09c5e9b597b220c7a2b43611f4710dc03ceb8748637775692c"
+
 [[package]]
 name = "cc"
 version = "1.0.72"
@@ -505,6 +719,15 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
 
+[[package]]
+name = "concurrent-queue"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30ed07550be01594c6026cff2a1d7fe9c8f683caa798e12b68694ac9e88286a3"
+dependencies = [
+ "cache-padded",
+]
+
 [[package]]
 name = "const_fn"
 version = "0.4.9"
@@ -651,13 +874,22 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e25ea47919b1560c4e3b7fe0aaab9becf5b84a10325ddf7db0f0ba5e1026499"
 
+[[package]]
+name = "digest"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
+dependencies = [
+ "generic-array 0.12.4",
+]
+
 [[package]]
 name = "digest"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
 dependencies = [
- "generic-array",
+ "generic-array 0.14.5",
 ]
 
 [[package]]
@@ -693,6 +925,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "event-listener"
+version = "2.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77f3309417938f28bf8228fcff79a4a37103981e3e186d2ccd19c74b38f4eb71"
+
 [[package]]
 name = "evmap"
 version = "10.0.2"
@@ -712,6 +950,12 @@ dependencies = [
  "mutate_once",
 ]
 
+[[package]]
+name = "fake-simd"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
+
 [[package]]
 name = "fastrand"
 version = "1.6.0"
@@ -788,6 +1032,7 @@ checksum = "28560757fe2bb34e79f907794bb6b22ae8b0e5c669b638a1132f2592b19035b4"
 dependencies = [
  "futures-channel",
  "futures-core",
+ "futures-executor",
  "futures-io",
  "futures-sink",
  "futures-task",
@@ -810,12 +1055,38 @@ version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d0c8ff0461b82559810cdccfde3215c3f373807f5e5232b71479bff7bb2583d7"
 
+[[package]]
+name = "futures-executor"
+version = "0.3.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29d6d2ff5bb10fb95c85b8ce46538a2e5f5e7fdc755623a7d4529ab8a4ed9d2a"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
 [[package]]
 name = "futures-io"
 version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1f9d34af5a1aac6fb380f735fe510746c38067c5bf16c7fd250280503c971b2"
 
+[[package]]
+name = "futures-lite"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7694489acd39452c77daa48516b894c153f192c3578d5a839b62c58099fcbf48"
+dependencies = [
+ "fastrand",
+ "futures-core",
+ "futures-io",
+ "memchr",
+ "parking",
+ "pin-project-lite 0.2.8",
+ "waker-fn",
+]
+
 [[package]]
 name = "futures-macro"
 version = "0.3.19"
@@ -866,6 +1137,15 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffdf9f34f1447443d37393cc6c2b8313aebddcd96906caf34e54c68d8e57d7bd"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.5"
@@ -897,6 +1177,18 @@ dependencies = [
  "weezl",
 ]
 
+[[package]]
+name = "gloo-timers"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d12a7f4e95cfe710f1d624fb1210b7d961a5fb05c4fd942f4feab06e61f590e"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "h2"
 version = "0.2.7"
@@ -931,7 +1223,7 @@ dependencies = [
  "http",
  "indexmap",
  "slab",
- "tokio 1.15.0",
+ "tokio 1.16.1",
  "tokio-util 0.6.9",
  "tracing",
 ]
@@ -966,6 +1258,18 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "hex"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
+
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
 [[package]]
 name = "hostname"
 version = "0.3.1"
@@ -1029,7 +1333,7 @@ dependencies = [
  "itoa 0.4.8",
  "pin-project-lite 0.2.8",
  "socket2 0.4.2",
- "tokio 1.15.0",
+ "tokio 1.16.1",
  "tower-service",
  "tracing",
  "want",
@@ -1044,7 +1348,7 @@ dependencies = [
  "bytes 1.1.0",
  "hyper",
  "native-tls",
- "tokio 1.15.0",
+ "tokio 1.16.1",
  "tokio-native-tls",
 ]
 
@@ -1164,6 +1468,15 @@ dependencies = [
  "winapi-build",
 ]
 
+[[package]]
+name = "kv-log-macro"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0de8b303297635ad57c9f5059fd9cee7a47f8e8daa09df0fcd07dd39fb22977f"
+dependencies = [
+ "log",
+]
+
 [[package]]
 name = "language-tags"
 version = "0.2.2"
@@ -1204,6 +1517,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
 dependencies = [
  "cfg-if 1.0.0",
+ "value-bag",
 ]
 
 [[package]]
@@ -1239,6 +1553,15 @@ version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
 
+[[package]]
+name = "memmap2"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "057a3db23999c867821a7a59feb06a578fcb03685e983dff90daf9e7d24ac08f"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "memoffset"
 version = "0.6.5"
@@ -1467,6 +1790,12 @@ version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "da32515d9f6e6e489d7bc9d84c71b060db7247dc035bbe44eac88cf87486d8d5"
 
+[[package]]
+name = "opaque-debug"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
+
 [[package]]
 name = "opaque-debug"
 version = "0.3.0"
@@ -1515,6 +1844,12 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "parking"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "427c3892f9e783d91cc128285287e70a59e206ca452770ece88a76f7a3eddd72"
+
 [[package]]
 name = "parking_lot"
 version = "0.11.2"
@@ -1622,6 +1957,19 @@ dependencies = [
  "miniz_oxide 0.3.7",
 ]
 
+[[package]]
+name = "polling"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "685404d509889fade3e86fe3a5803bca2ec09b0c0778d5ada6ec8bf7a8de5259"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "log",
+ "wepoll-ffi",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.16"
@@ -1777,7 +2125,7 @@ version = "0.11.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c4e0a76dc12a116108933f6301b95e83634e0c47b0afbed6abbaa0601e99258"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "bytes 1.1.0",
  "encoding_rs",
  "futures-core",
@@ -1797,7 +2145,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_urlencoded",
- "tokio 1.15.0",
+ "tokio 1.16.1",
  "tokio-native-tls",
  "url",
  "wasm-bindgen",
@@ -1849,6 +2197,15 @@ version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
 
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "schannel"
 version = "0.1.19"
@@ -1958,17 +2315,29 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sha-1"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7d94d0bede923b3cea61f3f1ff57ff8cdfd77b400fb8f9998949e0cf04163df"
+dependencies = [
+ "block-buffer 0.7.3",
+ "digest 0.8.1",
+ "fake-simd",
+ "opaque-debug 0.2.3",
+]
+
 [[package]]
 name = "sha-1"
 version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "99cd6713db3cf16b6c84e06321e049a9b9f699826e16096d23bbcc44d15d51a6"
 dependencies = [
- "block-buffer",
+ "block-buffer 0.9.0",
  "cfg-if 1.0.0",
  "cpufeatures",
- "digest",
- "opaque-debug",
+ "digest 0.9.0",
+ "opaque-debug 0.3.0",
 ]
 
 [[package]]
@@ -1977,6 +2346,41 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
 
+[[package]]
+name = "sha2"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a256f46ea78a0c0d9ff00077504903ac881a1dafdc20da66545699e7776b3e69"
+dependencies = [
+ "block-buffer 0.7.3",
+ "digest 0.8.1",
+ "fake-simd",
+ "opaque-debug 0.2.3",
+]
+
+[[package]]
+name = "sha2"
+version = "0.9.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
+dependencies = [
+ "block-buffer 0.9.0",
+ "cfg-if 1.0.0",
+ "cpufeatures",
+ "digest 0.9.0",
+ "opaque-debug 0.3.0",
+]
+
+[[package]]
+name = "signal-hook"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "647c97df271007dcea485bb74ffdb57f2e683f1306c854f468a0c244badabf2d"
+dependencies = [
+ "libc",
+ "signal-hook-registry",
+]
+
 [[package]]
 name = "signal-hook-registry"
 version = "1.4.0"
@@ -2019,6 +2423,21 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "ssri"
+version = "7.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9cec0d388f39fbe79d7aa600e8d38053bf97b1bc8d350da7c0ba800d0f423f2"
+dependencies = [
+ "base64 0.10.1",
+ "digest 0.8.1",
+ "hex 0.3.2",
+ "serde",
+ "sha-1 0.8.2",
+ "sha2 0.8.2",
+ "thiserror",
+]
+
 [[package]]
 name = "standback"
 version = "0.2.17"
@@ -2110,7 +2529,8 @@ dependencies = [
  "actix-http",
  "actix-web",
  "assertor",
- "base64",
+ "base64 0.13.0",
+ "cacache",
  "chrono",
  "clokwerk",
  "evmap",
@@ -2254,9 +2674,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.15.0"
+version = "1.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fbbf1c778ec206785635ce8ad57fe52b3009ae9e0c9f574a728f3049d3e55838"
+checksum = "0c27a64b625de6d309e8c57716ba93021dccf1b3b5c97edd6d3dd2d2135afc0a"
 dependencies = [
  "bytes 1.1.0",
  "libc",
@@ -2274,7 +2694,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7d995660bd2b7f8c1568414c1126076c13fbb725c40112dc0120b78eb9b717b"
 dependencies = [
  "native-tls",
- "tokio 1.15.0",
+ "tokio 1.16.1",
 ]
 
 [[package]]
@@ -2302,7 +2722,7 @@ dependencies = [
  "futures-sink",
  "log",
  "pin-project-lite 0.2.8",
- "tokio 1.15.0",
+ "tokio 1.16.1",
 ]
 
 [[package]]
@@ -2473,6 +2893,16 @@ dependencies = [
  "v_escape",
 ]
 
+[[package]]
+name = "value-bag"
+version = "1.0.0-alpha.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79923f7731dc61ebfba3633098bf3ac533bbd35ccd8c57e7088d9a5eebe0263f"
+dependencies = [
+ "ctor",
+ "version_check 0.9.4",
+]
+
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
@@ -2491,6 +2921,23 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
+[[package]]
+name = "waker-fn"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d5b2c62b4012a3e1eca5a7e077d13b3bf498c4073e33ccd58626607748ceeca"
+
+[[package]]
+name = "walkdir"
+version = "2.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
+dependencies = [
+ "same-file",
+ "winapi 0.3.9",
+ "winapi-util",
+]
+
 [[package]]
 name = "want"
 version = "0.3.0"
@@ -2595,6 +3042,15 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d8b77fdfd5a253be4ab714e4ffa3c49caf146b4de743e97510c0656cf90f1e8e"
 
+[[package]]
+name = "wepoll-ffi"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d743fdedc5c64377b5fc2bc036b01c7fd642205a0d96356034ae3404d49eb7fb"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "widestring"
 version = "0.4.3"
@@ -2629,6 +3085,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
diff --git a/Cargo.toml b/Cargo.toml
index 65a1136..0f08f06 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ rayon = "1.5"
 regex = "1.5"
 base64 = "0.13"
 image = "0.23"
+cacache = "10"
 
 [dev-dependencies]
 assertor = "0.0"
diff --git a/src/image_processor_test.rs b/src/image_processor_test.rs
index c0d777e..3e345c0 100644
--- a/src/image_processor_test.rs
+++ b/src/image_processor_test.rs
@@ -18,7 +18,7 @@ fn scale_image() {
         image_data,
         1024,
         786,
-        None
+        None,
     );
 
     // THEN the resolved city name should be Koblenz
diff --git a/src/main.rs b/src/main.rs
index c076139..ed80468 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,7 +22,6 @@ mod image_processor_test;
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
     // Build webdav client
-
     let web_dav_client = web_dav_client::new(
         env::var("TWIP_WEBDAV_BASE_URL").expect("TWIP_WEBDAV_BASE_URL is missing").as_str(),
         env::var("TWIP_USERNAME").expect("TWIP_USERNAME is missing").as_str(),
@@ -31,11 +30,11 @@ async fn main() -> std::io::Result<()> {
 
     // Initialize kv_store reader and writer
     let (kv_reader, kv_writer) = evmap::new::<String, String>();
-    // Build arc mutex of kv_store writer (we have multiple writer)
+    // Build arc mutex of kv_store writer, we need this exact instance (cause, we have multiple writer)
     let kv_writer_mutex = Arc::new(Mutex::new(kv_writer));
 
     // Start scheduler to run at midnight
-    let scheduler_handle = scheduler::initialize(
+    let scheduler_handle = scheduler::run_webdav_indexer(
         web_dav_client.clone(),
         kv_writer_mutex.clone(),
     );
diff --git a/src/resource_endpoint.rs b/src/resource_endpoint.rs
index 69fb8f2..1ebf936 100644
--- a/src/resource_endpoint.rs
+++ b/src/resource_endpoint.rs
@@ -4,6 +4,8 @@ use evmap::ReadHandle;
 
 use crate::{get, image_processor, resource_processor, WebDavClient, WebDavResource};
 
+const CACHE_DIR: &'static str = "./cache";
+
 #[get("")]
 pub async fn list_resources(kv_reader: web::Data<ReadHandle<String, String>>) -> HttpResponse {
     let keys: Vec<String> = resource_processor::get_all(kv_reader.as_ref());
@@ -23,7 +25,11 @@ pub async fn list_this_week_resources(kv_reader: web::Data<ReadHandle<String, St
 }
 
 #[get("{resource_id}/{display_width}/{display_height}")]
-pub async fn get_resource(resources_id: web::Path<(String, u32, u32)>, kv_reader: web::Data<ReadHandle<String, String>>, web_dav_client: web::Data<WebDavClient>) -> HttpResponse {
+pub async fn get_resource(
+    resources_id: web::Path<(String, u32, u32)>,
+    kv_reader: web::Data<ReadHandle<String, String>>,
+    web_dav_client: web::Data<WebDavClient>,
+) -> HttpResponse {
     let path_params = resources_id.0;
     let resource_id = path_params.0.as_str();
     let display_width = path_params.1;
@@ -54,14 +60,30 @@ pub async fn get_resource(resources_id: web::Path<(String, u32, u32)>, kv_reader
 }
 
 #[get("{resource_id}/{display_width}/{display_height}/base64")]
-pub async fn get_resource_base64(resources_id: web::Path<(String, u32, u32)>, kv_reader: web::Data<ReadHandle<String, String>>, web_dav_client: web::Data<WebDavClient>) -> HttpResponse {
-    // TODO request caching
-
+pub async fn get_resource_base64(
+    resources_id: web::Path<(String, u32, u32)>,
+    kv_reader: web::Data<ReadHandle<String, String>>,
+    web_dav_client: web::Data<WebDavClient>,
+) -> HttpResponse {
     let path_params = resources_id.0;
     let resource_id = path_params.0.as_str();
     let display_width = path_params.1;
     let display_height = path_params.2;
 
+    // check cache
+    let cached_data = cacache::read(
+        CACHE_DIR,
+        format!("{resource_id}_{display_width}_{display_height}"),
+    );
+    if let Ok(cached_data) = cached_data.await {
+        println!(" #### Cache hit! {}", format!("{resource_id}_{display_width}_{display_height}"));
+        return HttpResponse::Ok()
+            .content_type("plain/text")
+            .body(cached_data);
+    }
+    println!(" #### Cache miss! {}", format!("{resource_id}_{display_width}_{display_height}"));
+
+    // Read image from webdav
     let web_dav_resource = kv_reader.get_one(resource_id)
         .map(|value| value.to_string())
         .and_then(|resource_json_string| serde_json::from_str(resource_json_string.as_str()).ok());
@@ -75,6 +97,12 @@ pub async fn get_resource_base64(resources_id: web::Path<(String, u32, u32)>, kv
         .map(|base64_string| format!("data:image/png;base64,{}", base64_string));
 
     if let Some(base64_image) = base64_image {
+        cacache::write(
+            CACHE_DIR,
+            format!("{resource_id}_{display_width}_{display_height}"),
+            base64_image.as_bytes(),
+        ).await.unwrap();
+
         HttpResponse::Ok()
             .content_type("plain/text")
             .body(base64_image)
@@ -84,7 +112,10 @@ pub async fn get_resource_base64(resources_id: web::Path<(String, u32, u32)>, kv
 }
 
 #[get("{resource_id}/metadata")]
-pub async fn get_resource_metadata(resources_id: web::Path<String>, kv_reader: web::Data<ReadHandle<String, String>>) -> HttpResponse {
+pub async fn get_resource_metadata(
+    resources_id: web::Path<String>,
+    kv_reader: web::Data<ReadHandle<String, String>>,
+) -> HttpResponse {
     let metadata = kv_reader.get_one(resources_id.as_str())
         .map(|value| value.to_string());
 
@@ -98,7 +129,10 @@ pub async fn get_resource_metadata(resources_id: web::Path<String>, kv_reader: w
 }
 
 #[get("{resource_id}/description")]
-pub async fn get_resource_metadata_description(resources_id: web::Path<String>, kv_reader: web::Data<ReadHandle<String, String>>) -> HttpResponse {
+pub async fn get_resource_metadata_description(
+    resources_id: web::Path<String>,
+    kv_reader: web::Data<ReadHandle<String, String>>,
+) -> HttpResponse {
     let display_value = kv_reader.get_one(resources_id.as_str())
         .map(|value| value.to_string())
         .and_then(|resource_json_string| serde_json::from_str(resource_json_string.as_str()).ok())
diff --git a/src/scheduler.rs b/src/scheduler.rs
index 7378bd4..398401c 100644
--- a/src/scheduler.rs
+++ b/src/scheduler.rs
@@ -6,7 +6,7 @@ use evmap::WriteHandle;
 
 use crate::web_dav_client::WebDavClient;
 
-pub fn initialize(web_dav_client: WebDavClient, kv_writer_mutex: Arc<Mutex<WriteHandle<String, String>>>) -> ScheduleHandle {
+pub fn run_webdav_indexer(web_dav_client: WebDavClient, kv_writer_mutex: Arc<Mutex<WriteHandle<String, String>>>) -> ScheduleHandle {
     let mut scheduler = Scheduler::new();
 
     // Fetch webdav resources at midnight