From b36ca2c4f10cf3e42115ca0a86cf36189442b3c7 Mon Sep 17 00:00:00 2001
From: Dave Hrycyszyn <futurechimp@users.noreply.github.com>
Date: Wed, 4 Aug 2021 12:38:35 +0100
Subject: [PATCH] Add Network Explorer API (#720)

* Adding the explorer API

* Added explorer-api to workspace

* Re-jigged explorer api cargo paths

* Fixed compiler warnings

* Removing unused code

* network-explorer-api: configure state with env var API_STATE_FILE or fall back to default value of `explorer-api-state.json`

* network-explorer-api: updates to `Cargo.lock` file after rebasing

* network-explorer-api: make clippy happy
---
 Cargo.lock                                    |  176 +-
 Cargo.toml                                    |    1 +
 explorer-api/.gitignore                       |    2 +
 explorer-api/Cargo.lock                       | 2438 +++++++++++++++++
 explorer-api/Cargo.toml                       |   23 +
 explorer-api/README.md                        |   17 +
 .../country_nodes_distribution.rs             |   35 +
 explorer-api/src/country_statistics/http.rs   |   19 +
 explorer-api/src/country_statistics/mod.rs    |  124 +
 explorer-api/src/country_statistics/models.rs |   16 +
 explorer-api/src/http/mod.rs                  |   28 +
 explorer-api/src/http/swagger.rs              |   11 +
 explorer-api/src/main.rs                      |   72 +
 explorer-api/src/node_numbers/http.rs         |    0
 .../src/node_numbers/network_size_recorder.rs |    0
 explorer-api/src/ping/http.rs                 |   19 +
 explorer-api/src/ping/mod.rs                  |    1 +
 explorer-api/src/state.rs                     |   82 +
 18 files changed, 3052 insertions(+), 12 deletions(-)
 create mode 100644 explorer-api/.gitignore
 create mode 100644 explorer-api/Cargo.lock
 create mode 100644 explorer-api/Cargo.toml
 create mode 100644 explorer-api/README.md
 create mode 100644 explorer-api/src/country_statistics/country_nodes_distribution.rs
 create mode 100644 explorer-api/src/country_statistics/http.rs
 create mode 100644 explorer-api/src/country_statistics/mod.rs
 create mode 100644 explorer-api/src/country_statistics/models.rs
 create mode 100644 explorer-api/src/http/mod.rs
 create mode 100644 explorer-api/src/http/swagger.rs
 create mode 100644 explorer-api/src/main.rs
 create mode 100644 explorer-api/src/node_numbers/http.rs
 create mode 100644 explorer-api/src/node_numbers/network_size_recorder.rs
 create mode 100644 explorer-api/src/ping/http.rs
 create mode 100644 explorer-api/src/ping/mod.rs
 create mode 100644 explorer-api/src/state.rs

diff --git a/Cargo.lock b/Cargo.lock
index 758856d4d1..a01e495f93 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -367,6 +367,20 @@ dependencies = [
  "keystream",
 ]
 
+[[package]]
+name = "chrono"
+version = "0.4.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+dependencies = [
+ "libc",
+ "num-integer",
+ "num-traits",
+ "serde",
+ "time 0.1.44",
+ "winapi",
+]
+
 [[package]]
 name = "cipher"
 version = "0.2.5"
@@ -385,7 +399,7 @@ dependencies = [
  "ansi_term",
  "atty",
  "bitflags",
- "strsim",
+ "strsim 0.8.0",
  "textwrap",
  "unicode-width",
  "vec_map",
@@ -477,7 +491,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ffdf8865bac3d9a3bde5bde9088ca431b11f5d37c7a578b8086af77248b76627"
 dependencies = [
  "percent-encoding",
- "time",
+ "time 0.2.27",
  "version_check",
 ]
 
@@ -693,6 +707,41 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "darling"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "757c0ded2af11d8e739c4daea1ac623dd1624b06c844cf3f5a39f1bdbd99bb12"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c34d8efb62d0c2d7f60ece80f75e5c63c1588ba68032740494b0b9a996466e3"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim 0.10.0",
+ "syn",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ade7bff147130fe5e6d39f089c6bd49ec0250f35d70b2eebf72afdfc919f15cc"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "dashmap"
 version = "4.0.2"
@@ -913,6 +962,26 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "explorer-api"
+version = "0.1.0"
+dependencies = [
+ "chrono",
+ "isocountry",
+ "log",
+ "mixnet-contract",
+ "okapi",
+ "pretty_env_logger",
+ "reqwest",
+ "rocket",
+ "rocket_okapi",
+ "schemars",
+ "serde",
+ "serde_json",
+ "tokio",
+ "validator-client",
+]
+
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
@@ -1184,7 +1253,7 @@ dependencies = [
  "cfg-if 1.0.0",
  "js-sys",
  "libc",
- "wasi 0.10.2+wasi-snapshot-preview1",
+ "wasi 0.10.0+wasi-snapshot-preview1",
  "wasm-bindgen",
 ]
 
@@ -1426,6 +1495,12 @@ dependencies = [
  "tokio-native-tls",
 ]
 
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
 [[package]]
 name = "idna"
 version = "0.2.3"
@@ -1487,6 +1562,16 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "isocountry"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ea1dc4bf0fb4904ba83ffdb98af3d9c325274e92e6e295e4151e86c96363e04"
+dependencies = [
+ "serde",
+ "thiserror",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.7"
@@ -1782,6 +1867,16 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "num-integer"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.14"
@@ -2117,6 +2212,17 @@ dependencies = [
  "sphinx",
 ]
 
+[[package]]
+name = "okapi"
+version = "0.6.0-alpha-1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb085e00daf8d75b9dbf0ffdb4738e69503e28898d9641fa8bdc6ad536c7bcf4"
+dependencies = [
+ "schemars",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.8.0"
@@ -2701,7 +2807,7 @@ dependencies = [
  "serde_json",
  "state",
  "tempfile",
- "time",
+ "time 0.2.27",
  "tokio",
  "tokio-stream",
  "tokio-util",
@@ -2764,11 +2870,38 @@ dependencies = [
  "smallvec",
  "stable-pattern",
  "state",
- "time",
+ "time 0.2.27",
  "tokio",
  "uncased",
 ]
 
+[[package]]
+name = "rocket_okapi"
+version = "0.7.0-alpha-1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b2f4f48fb070f9f6c56d5663df5fa8a514406207744f4abd84661bfb24efd7d"
+dependencies = [
+ "okapi",
+ "rocket",
+ "rocket_okapi_codegen",
+ "schemars",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "rocket_okapi_codegen"
+version = "0.7.0-alpha-1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88ccf1550e1c806461a6b08e2ab64eb10701d41bf50bde59ab9aa3a57ab14d41"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "rocket_http",
+ "syn",
+]
+
 [[package]]
 name = "rocket_sync_db_pools"
 version = "0.1.0-rc.1"
@@ -2852,6 +2985,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bc6ab463ae35acccb5cba66c0084c985257b797d288b6050cc2f6ac1b266cb78"
 dependencies = [
  "dyn-clone",
+ "indexmap",
  "schemars_derive",
  "serde",
  "serde_json",
@@ -2989,9 +3123,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.64"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "799e97dc9fdae36a5c8b8f2cae9ce2ee9fdce2058c57a93e6099d919fd982f79"
+checksum = "336b10da19a12ad094b59d870ebde26a45402e5b470add4b5fd03c5048a32127"
 dependencies = [
  "itoa",
  "ryu",
@@ -3277,7 +3411,7 @@ dependencies = [
  "sqlx-rt",
  "stringprep",
  "thiserror",
- "time",
+ "time 0.2.27",
  "tokio-stream",
  "url",
  "webpki",
@@ -3423,6 +3557,12 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
 [[package]]
 name = "subtle"
 version = "1.0.0"
@@ -3516,6 +3656,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "time"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
+dependencies = [
+ "libc",
+ "wasi 0.10.0+wasi-snapshot-preview1",
+ "winapi",
+]
+
 [[package]]
 name = "time"
 version = "0.2.27"
@@ -3571,9 +3722,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.8.0"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "570c2eb13b3ab38208130eccd41be92520388791207fde783bda7c1e8ace28d4"
+checksum = "4b7b349f11a7047e6d1276853e612d152f5e8a352c61917887cc2169e2366b4c"
 dependencies = [
  "autocfg",
  "bytes",
@@ -3582,6 +3733,7 @@ dependencies = [
  "mio",
  "num_cpus",
  "once_cell",
+ "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",
  "tokio-macros",
@@ -3951,9 +4103,9 @@ checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 
 [[package]]
 name = "wasi"
-version = "0.10.2+wasi-snapshot-preview1"
+version = "0.10.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
 
 [[package]]
 name = "wasm-bindgen"
diff --git a/Cargo.toml b/Cargo.toml
index 1f8a0a5e77..e5d5a2ae16 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,6 +39,7 @@ members = [
     "common/socks5/proxy-helpers",
     "common/topology",
     "common/wasm-utils",
+    "explorer-api",
     "gateway",
     "gateway/gateway-requests",
     "mixnode",
diff --git a/explorer-api/.gitignore b/explorer-api/.gitignore
new file mode 100644
index 0000000000..8731db8ba6
--- /dev/null
+++ b/explorer-api/.gitignore
@@ -0,0 +1,2 @@
+target
+explorer-api-state.json
diff --git a/explorer-api/Cargo.lock b/explorer-api/Cargo.lock
new file mode 100644
index 0000000000..074de6ffb9
--- /dev/null
+++ b/explorer-api/Cargo.lock
@@ -0,0 +1,2438 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "async-stream"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "171374e7e3b2504e0e5236e3b59260560f9fe94bfe9ac39ba5e4e929c5590625"
+dependencies = [
+ "async-stream-impl",
+ "futures-core",
+]
+
+[[package]]
+name = "async-stream-impl"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "648ed8c8d2ce5409ccd57453d9d1b214b342a0d69376a6feda1fd6cae3299308"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "async-trait"
+version = "0.1.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b98e84bbb4cbcdd97da190ba0c58a1bb0de2c1fdf67d159e192ed766aeca722"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "atomic"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3410529e8288c463bedb5930f82833bc0c90e5d2fe639a56582a4d09220b281"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "base-x"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4521f3e3d031370679b3b140beb36dfe4801b09ac77e30c61941f97df3ef28b"
+
+[[package]]
+name = "base64"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+
+[[package]]
+name = "binascii"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "383d29d513d8764dcdc42ea295d979eb99c3c9f00607b3692cf68a431f7dca72"
+
+[[package]]
+name = "bitflags"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
+
+[[package]]
+name = "bitvec"
+version = "0.18.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98fcd36dda4e17b7d7abc64cb549bf0201f4ab71e00700c798ca7e62ed3761fa"
+dependencies = [
+ "funty",
+ "radium",
+ "wyz",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "bumpalo"
+version = "3.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c59e7af012c713f529e7a3ee57ce9b31ddd858d4b512923602f74608b009631"
+
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
+name = "bytes"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b700ce4376041dcd0a327fd0097c41095743c4c8af8887265942faf1100bd040"
+
+[[package]]
+name = "cc"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e70cc2f62c6ce1868963827bd677764c62d07c3d9a3e1fb1177ee1a9ab199eb2"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "chrono"
+version = "0.4.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+dependencies = [
+ "libc",
+ "num-integer",
+ "num-traits",
+ "serde",
+ "time 0.1.43",
+ "winapi",
+]
+
+[[package]]
+name = "const-oid"
+version = "0.4.5"
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+
+[[package]]
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+checksum = "f92cfa0fd5690b3cf8c1ef2cabbd9b7ef22fa53cf5e1f92b05103f6d5d1cf6e7"
+
+[[package]]
+name = "convert_case"
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+
+[[package]]
+name = "cookie"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d5f1c7727e460397e56abc4bddc1d49e07a1ad78fc98eb2e1c8f032a58a2f80d"
+dependencies = [
+ "percent-encoding",
+ "time 0.2.27",
+ "version_check",
+]
+
+[[package]]
+name = "core-foundation"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0a89e2ae426ea83155dccf10c0fa6b1463ef6d5fcb44cee0b224a408fa640a62"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation-sys"
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+
+[[package]]
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+checksum = "038089cdadfe61e4e85617d91cecec2c49f828db8e5986bb85e29d0b29c59b77"
+dependencies = [
+ "digest",
+ "ed25519-zebra",
+ "k256",
+ "rand_core 0.5.1",
+ "thiserror",
+]
+
+[[package]]
+name = "cosmwasm-derive"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "628bf3da935843795a7f52678262ef06398878b0cf4c89b69612d8525ea27b84"
+dependencies = [
+ "syn",
+]
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+ "parking_lot",
+ "pin-utils",
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+ "web-sys",
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
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diff --git a/explorer-api/Cargo.toml b/explorer-api/Cargo.toml
new file mode 100644
index 0000000000..b8e87fde86
--- /dev/null
+++ b/explorer-api/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "explorer-api"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+isocountry = "0.3.2"
+reqwest = "0.11.4"
+rocket = {version = "0.5.0-rc.1", features=["json"] }
+serde = "1.0.126"
+serde_json = "1.0.66"
+tokio = {version = "1.9.0", features = ["full"] }
+chrono = { version = "0.4.19", features = ["serde"] }
+schemars = { version = "0.8", features = ["preserve_order"] }
+okapi = { version = "0.6.0-alpha-1", features = ["derive_json_schema"] }
+rocket_okapi = "0.7.0-alpha-1"
+log = "0.4.0"
+pretty_env_logger = "0.4.0"
+
+mixnet-contract = { path = "../common/mixnet-contract" }
+validator-client = { path = "../common/client-libs/validator-client" }
diff --git a/explorer-api/README.md b/explorer-api/README.md
new file mode 100644
index 0000000000..49532965ca
--- /dev/null
+++ b/explorer-api/README.md
@@ -0,0 +1,17 @@
+Network Explorer API
+====================
+
+An API that can: 
+
+* calculate how many nodes are in which country, by checking the IPs of all nodes against an external service
+* serve "hello world" via HTTP
+
+
+TODO:
+
+* record the number of mixnodes on a given date and write to a file for later retrieval
+* store the nodes per country state in a variable
+* grab mixnode description info via reqwest and serve it (avoid mixed-content errors)
+* serve it all over http
+* dependency injection
+* tests
\ No newline at end of file
diff --git a/explorer-api/src/country_statistics/country_nodes_distribution.rs b/explorer-api/src/country_statistics/country_nodes_distribution.rs
new file mode 100644
index 0000000000..03abdf2dac
--- /dev/null
+++ b/explorer-api/src/country_statistics/country_nodes_distribution.rs
@@ -0,0 +1,35 @@
+use std::collections::HashMap;
+use std::sync::Arc;
+use tokio::sync::RwLock;
+
+pub type CountryNodesDistribution = HashMap<String, u32>;
+
+#[derive(Clone)]
+pub struct ConcurrentCountryNodesDistribution {
+    inner: Arc<RwLock<CountryNodesDistribution>>,
+}
+
+impl ConcurrentCountryNodesDistribution {
+    pub(crate) fn new() -> Self {
+        ConcurrentCountryNodesDistribution {
+            inner: Arc::new(RwLock::new(CountryNodesDistribution::new())),
+        }
+    }
+
+    pub(crate) fn attach(country_node_distribution: CountryNodesDistribution) -> Self {
+        ConcurrentCountryNodesDistribution {
+            inner: Arc::new(RwLock::new(country_node_distribution)),
+        }
+    }
+
+    pub(crate) async fn set_all(&mut self, country_node_distribution: CountryNodesDistribution) {
+        self.inner
+            .write()
+            .await
+            .clone_from(&country_node_distribution)
+    }
+
+    pub(crate) async fn get_all(&self) -> HashMap<String, u32> {
+        self.inner.read().await.clone()
+    }
+}
diff --git a/explorer-api/src/country_statistics/http.rs b/explorer-api/src/country_statistics/http.rs
new file mode 100644
index 0000000000..6b0b807ac0
--- /dev/null
+++ b/explorer-api/src/country_statistics/http.rs
@@ -0,0 +1,19 @@
+use crate::country_statistics::country_nodes_distribution::CountryNodesDistribution;
+use crate::state::ExplorerApiStateContext;
+use rocket::serde::json::Json;
+use rocket::{Route, State};
+
+pub fn make_default_routes() -> Vec<Route> {
+    routes_with_openapi![index]
+}
+
+// We could either separate stuff by structure (like this, http is separate), or we could just
+// stick the http route directly into each sub-application (e.g. put this file into the
+// "country_statistics" module directly
+#[openapi(tag = "country_statistics")]
+#[get("/")]
+pub(crate) async fn index(
+    state: &State<ExplorerApiStateContext>,
+) -> Json<CountryNodesDistribution> {
+    Json(state.inner.country_node_distribution.get_all().await)
+}
diff --git a/explorer-api/src/country_statistics/mod.rs b/explorer-api/src/country_statistics/mod.rs
new file mode 100644
index 0000000000..6639a70a98
--- /dev/null
+++ b/explorer-api/src/country_statistics/mod.rs
@@ -0,0 +1,124 @@
+use isocountry::CountryCode;
+use log::{info, trace, warn};
+use mixnet_contract::MixNodeBond;
+use reqwest::Error as ReqwestError;
+use validator_client::Config;
+
+use models::GeoLocation;
+
+use crate::country_statistics::country_nodes_distribution::CountryNodesDistribution;
+use crate::state::ExplorerApiStateContext;
+
+pub mod country_nodes_distribution;
+pub mod http;
+mod models;
+
+pub(crate) struct CountryStatistics {
+    state: ExplorerApiStateContext,
+}
+
+impl CountryStatistics {
+    pub(crate) fn new(state: ExplorerApiStateContext) -> Self {
+        CountryStatistics { state }
+    }
+
+    pub(crate) fn start(mut self) {
+        info!("Spawning task runner...");
+        tokio::spawn(async move {
+            let mut interval_timer = tokio::time::interval(std::time::Duration::from_secs(60 * 60));
+            loop {
+                // wait for the next interval tick
+                interval_timer.tick().await;
+
+                info!("Running task...");
+                self.calculate_nodes_per_country().await;
+                info!("Done");
+            }
+        });
+    }
+
+    /// Retrieves the current list of mixnodes from the validators and calculates how many nodes are in each country
+    async fn calculate_nodes_per_country(&mut self) {
+        let mixnode_bonds = retrieve_mixnodes().await;
+
+        let mut distribution = CountryNodesDistribution::new();
+
+        info!("Locating mixnodes...");
+        for (i, bond) in mixnode_bonds.iter().enumerate() {
+            match locate(&bond.mix_node.host).await {
+                Ok(location) => {
+                    let country_code = map_2_letter_to_3_letter_country_code(&location);
+                    *(distribution.entry(country_code)).or_insert(0) += 1;
+
+                    trace!(
+                        "Ip {} is located in {:#?}",
+                        bond.mix_node.host,
+                        map_2_letter_to_3_letter_country_code(&location)
+                    );
+
+                    if (i % 100) == 0 {
+                        info!(
+                            "Located {} mixnodes in {} countries",
+                            i + 1,
+                            distribution.len()
+                        );
+                    }
+                }
+                Err(e) => warn!("❌ Oh no! Location failed {}", e),
+            }
+        }
+
+        // replace the shared distribution to be the new distribution
+        self.state
+            .inner
+            .country_node_distribution
+            .set_all(distribution)
+            .await;
+
+        info!(
+            "Locating mixnodes done: {:?}",
+            self.state.inner.country_node_distribution.get_all().await
+        );
+
+        // keep state on disk, so that when this process dies it can start up again and users get some data
+        self.state.write_to_file().await;
+    }
+}
+
+fn map_2_letter_to_3_letter_country_code(geo: &GeoLocation) -> String {
+    match CountryCode::for_alpha2(&geo.country_code) {
+        Ok(three_letter_country_code) => three_letter_country_code.alpha3().to_string(),
+        Err(_e) => {
+            warn!(
+                "❌ Oh no! map_2_letter_to_3_letter_country_code failed for '{:#?}'",
+                geo
+            );
+            "???".to_string()
+        }
+    }
+}
+
+async fn locate(ip: &str) -> Result<GeoLocation, ReqwestError> {
+    let response = reqwest::get(format!("{}{}", crate::GEO_IP_SERVICE, ip)).await?;
+    let location = response.json::<GeoLocation>().await?;
+    Ok(location)
+}
+
+async fn retrieve_mixnodes() -> Vec<MixNodeBond> {
+    let client = new_validator_client();
+
+    info!("About to retrieve mixnode bonds...");
+
+    let bonds: Vec<MixNodeBond> = match client.get_cached_mix_nodes().await {
+        Ok(result) => result,
+        Err(e) => panic!("Unable to retrieve mixnode bonds: {:?}", e),
+    };
+    info!("Fetched {} mixnode bonds", bonds.len());
+    bonds
+}
+
+// TODO: inject constants
+fn new_validator_client() -> validator_client::Client {
+    let config = Config::new(vec![crate::VALIDATOR_API.to_string()], crate::CONTRACT);
+    validator_client::Client::new(config)
+}
diff --git a/explorer-api/src/country_statistics/models.rs b/explorer-api/src/country_statistics/models.rs
new file mode 100644
index 0000000000..6f7b9b3d55
--- /dev/null
+++ b/explorer-api/src/country_statistics/models.rs
@@ -0,0 +1,16 @@
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+pub(crate) struct GeoLocation {
+    pub(crate) ip: String,
+    pub(crate) country_code: String,
+    pub(crate) country_name: String,
+    pub(crate) region_code: String,
+    pub(crate) region_name: String,
+    pub(crate) city: String,
+    pub(crate) zip_code: String,
+    pub(crate) time_zone: String,
+    pub(crate) latitude: f32,
+    pub(crate) longitude: f32,
+    pub(crate) metro_code: u32,
+}
diff --git a/explorer-api/src/http/mod.rs b/explorer-api/src/http/mod.rs
new file mode 100644
index 0000000000..6eae464f39
--- /dev/null
+++ b/explorer-api/src/http/mod.rs
@@ -0,0 +1,28 @@
+mod swagger;
+
+use crate::country_statistics::http::make_default_routes;
+use crate::http::swagger::get_docs;
+use crate::ping::http::ping_make_default_routes;
+use crate::state::ExplorerApiStateContext;
+use log::info;
+use rocket_okapi::swagger_ui::make_swagger_ui;
+
+pub(crate) fn start(state: ExplorerApiStateContext) {
+    tokio::spawn(async move {
+        info!("Starting up...");
+
+        let config = rocket::config::Config::release_default();
+
+        rocket::build()
+            .configure(config)
+            .mount("/countries", make_default_routes())
+            .mount("/ping", ping_make_default_routes())
+            .mount("/swagger", make_swagger_ui(&get_docs()))
+            // .register("/", catchers![not_found])
+            .manage(state)
+            // .manage(descriptor)
+            // .manage(node_stats_pointer)
+            .launch()
+            .await
+    });
+}
diff --git a/explorer-api/src/http/swagger.rs b/explorer-api/src/http/swagger.rs
new file mode 100644
index 0000000000..12bb19c5ed
--- /dev/null
+++ b/explorer-api/src/http/swagger.rs
@@ -0,0 +1,11 @@
+use rocket_okapi::swagger_ui::{SwaggerUIConfig, UrlObject};
+
+pub(crate) fn get_docs() -> SwaggerUIConfig {
+    SwaggerUIConfig {
+        urls: vec![
+            UrlObject::new("Country statistics", "/countries/openapi.json"),
+            UrlObject::new("Node ping", "/ping/openapi.json"),
+        ],
+        ..Default::default()
+    }
+}
diff --git a/explorer-api/src/main.rs b/explorer-api/src/main.rs
new file mode 100644
index 0000000000..729c1b27d4
--- /dev/null
+++ b/explorer-api/src/main.rs
@@ -0,0 +1,72 @@
+#[macro_use]
+extern crate rocket;
+#[macro_use]
+extern crate rocket_okapi;
+
+use log::info;
+
+mod country_statistics;
+mod http;
+mod ping;
+mod state;
+
+const VALIDATOR_API: &str = "http://testnet-milhon-validator1.nymtech.net:8080";
+const CONTRACT: &str = "punk10pyejy66429refv3g35g2t7am0was7yalwrzen";
+const GEO_IP_SERVICE: &str = "https://freegeoip.app/json/";
+
+#[tokio::main]
+async fn main() {
+    setup_logging();
+    let mut explorer_api = ExplorerApi::new();
+    explorer_api.run().await;
+}
+
+pub struct ExplorerApi {
+    state: state::ExplorerApiStateContext,
+}
+
+impl ExplorerApi {
+    fn new() -> ExplorerApi {
+        ExplorerApi {
+            state: state::ExplorerApiStateContext::new(),
+        }
+    }
+
+    async fn run(&mut self) {
+        info!("Explorer API starting up...");
+
+        // spawn concurrent tasks
+        country_statistics::CountryStatistics::new(self.state.clone()).start();
+        http::start(self.state.clone());
+
+        // wait for user to press ctrl+C
+        self.wait_for_interrupt().await
+    }
+
+    async fn wait_for_interrupt(&self) {
+        if let Err(e) = tokio::signal::ctrl_c().await {
+            error!(
+                "There was an error while capturing SIGINT - {:?}. We will terminate regardless",
+                e
+            );
+        }
+        info!(
+            "Received SIGINT - the mixnode will terminate now (threads are not yet nicely stopped, if you see stack traces that's alright)."
+        );
+    }
+}
+
+fn setup_logging() {
+    let mut log_builder = pretty_env_logger::formatted_timed_builder();
+    if let Ok(s) = ::std::env::var("RUST_LOG") {
+        log_builder.parse_filters(&s);
+    } else {
+        // default to 'Info'
+        log_builder.filter(None, log::LevelFilter::Info);
+    }
+
+    log_builder
+        .filter_module("tokio_reactor", log::LevelFilter::Warn)
+        .filter_module("reqwest", log::LevelFilter::Warn)
+        .init();
+}
diff --git a/explorer-api/src/node_numbers/http.rs b/explorer-api/src/node_numbers/http.rs
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/explorer-api/src/node_numbers/network_size_recorder.rs b/explorer-api/src/node_numbers/network_size_recorder.rs
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/explorer-api/src/ping/http.rs b/explorer-api/src/ping/http.rs
new file mode 100644
index 0000000000..06a7d20287
--- /dev/null
+++ b/explorer-api/src/ping/http.rs
@@ -0,0 +1,19 @@
+use rocket::serde::json::Json;
+use rocket::Route;
+use serde::Deserialize;
+use serde::Serialize;
+
+pub fn ping_make_default_routes() -> Vec<Route> {
+    routes_with_openapi![index]
+}
+
+#[derive(Deserialize, Serialize, JsonSchema)]
+pub(crate) struct PingResponse {
+    response_time: u32,
+}
+
+#[openapi(tag = "ping")]
+#[get("/")]
+pub(crate) async fn index() -> Json<PingResponse> {
+    Json(PingResponse { response_time: 42 })
+}
diff --git a/explorer-api/src/ping/mod.rs b/explorer-api/src/ping/mod.rs
new file mode 100644
index 0000000000..3883215fcb
--- /dev/null
+++ b/explorer-api/src/ping/mod.rs
@@ -0,0 +1 @@
+pub mod http;
diff --git a/explorer-api/src/state.rs b/explorer-api/src/state.rs
new file mode 100644
index 0000000000..bf2cb1e240
--- /dev/null
+++ b/explorer-api/src/state.rs
@@ -0,0 +1,82 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use std::fs::File;
+use std::path::Path;
+
+use log::info;
+
+use crate::country_statistics::country_nodes_distribution::{
+    ConcurrentCountryNodesDistribution, CountryNodesDistribution,
+};
+
+// TODO: change to an environment variable with a default value
+const STATE_FILE: &str = "explorer-api-state.json";
+
+#[derive(Clone)]
+pub struct ExplorerApiState {
+    pub(crate) country_node_distribution: ConcurrentCountryNodesDistribution,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ExplorerApiStateOnDisk {
+    pub(crate) country_node_distribution: CountryNodesDistribution,
+    pub(crate) as_at: DateTime<Utc>,
+}
+
+#[derive(Clone)]
+pub(crate) struct ExplorerApiStateContext {
+    pub(crate) inner: ExplorerApiState,
+    state_file: String,
+}
+
+impl ExplorerApiStateContext {
+    pub(crate) fn new() -> Self {
+        ExplorerApiStateContext {
+            inner: ExplorerApiStateContext::read_from_file(),
+            state_file: std::env::var("API_STATE_FILE").unwrap_or_else(|_| STATE_FILE.to_string()),
+        }
+    }
+
+    pub(crate) fn read_from_file() -> ExplorerApiState {
+        let json_file = get_state_file_path();
+        let json_file_path = Path::new(&json_file);
+        info!("Loading state from file {:?}...", json_file);
+        match File::open(json_file_path) {
+            Ok(file) => {
+                let state: ExplorerApiStateOnDisk =
+                    serde_json::from_reader(file).expect("error while reading json");
+                info!("Loaded state from file {:?}: {:?}", json_file, state);
+                ExplorerApiState {
+                    country_node_distribution: ConcurrentCountryNodesDistribution::attach(
+                        state.country_node_distribution,
+                    ),
+                }
+            }
+            Err(_e) => {
+                warn!(
+                    "Failed to load state from file {:?}, starting with empty state!",
+                    json_file
+                );
+                ExplorerApiState {
+                    country_node_distribution: ConcurrentCountryNodesDistribution::new(),
+                }
+            }
+        }
+    }
+
+    pub(crate) async fn write_to_file(&self) {
+        let json_file = get_state_file_path().to_string();
+        let json_file_path = Path::new(&json_file);
+        let file = File::create(json_file_path).expect("unable to create state json file");
+        let state = ExplorerApiStateOnDisk {
+            country_node_distribution: self.inner.country_node_distribution.get_all().await,
+            as_at: Utc::now(),
+        };
+        serde_json::to_writer(file, &state).expect("error writing state to disk");
+        info!("Saved file to '{:?}'", json_file_path.canonicalize());
+    }
+}
+
+fn get_state_file_path() -> String {
+    std::env::var("API_STATE_FILE").unwrap_or_else(|_| STATE_FILE.to_string())
+}