simple web server

.gitignore

@@ -1 +1,2 @@
 /target
+data.pdf

Cargo.lock

@@ -2,6 +2,214 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "actix-codec"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57a7559404a7f3573127aab53c08ce37a6c6a315c374a31070f3c91cd1b4a7fe"
+dependencies = [
+ "bitflags",
+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "log",
+ "memchr",
+ "pin-project-lite",
+ "tokio",
+ "tokio-util 0.7.1",
+]
+
+[[package]]
+name = "actix-files"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d81bde9a79336aa51ebed236e91fc1a0528ff67cfdf4f68ca4c61ede9fd26fb5"
+dependencies = [
+ "actix-http",
+ "actix-service",
+ "actix-utils",
+ "actix-web",
+ "askama_escape",
+ "bitflags",
+ "bytes",
+ "derive_more",
+ "futures-core",
+ "http-range",
+ "log",
+ "mime",
+ "mime_guess",
+ "percent-encoding",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "actix-http"
+version = "3.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5885cb81a0d4d0d322864bea1bb6c2a8144626b4fdc625d4c51eba197e7797a"
+dependencies = [
+ "actix-codec",
+ "actix-rt",
+ "actix-service",
+ "actix-utils",
+ "ahash",
+ "base64",
+ "bitflags",
+ "brotli",
+ "bytes",
+ "bytestring",
+ "derive_more",
+ "encoding_rs",
+ "flate2",
+ "futures-core",
+ "h2",
+ "http",
+ "httparse",
+ "httpdate",
+ "itoa 1.0.1",
+ "language-tags",
+ "local-channel",
+ "log",
+ "mime",
+ "percent-encoding",
+ "pin-project-lite",
+ "rand 0.8.5",
+ "sha-1",
+ "smallvec",
+ "zstd",
+]
+
+[[package]]
+name = "actix-macros"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "465a6172cf69b960917811022d8f29bc0b7fa1398bc4f78b3c466673db1213b6"
+dependencies = [
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "actix-router"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb60846b52c118f2f04a56cc90880a274271c489b2498623d58176f8ca21fa80"
+dependencies = [
+ "bytestring",
+ "firestorm",
+ "http",
+ "log",
+ "regex",
+ "serde",
+]
+
+[[package]]
+name = "actix-rt"
+version = "2.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ea16c295198e958ef31930a6ef37d0fb64e9ca3b6116e6b93a8bdae96ee1000"
+dependencies = [
+ "futures-core",
+ "tokio",
+]
+
+[[package]]
+name = "actix-server"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0da34f8e659ea1b077bb4637948b815cd3768ad5a188fdcd74ff4d84240cd824"
+dependencies = [
+ "actix-rt",
+ "actix-service",
+ "actix-utils",
+ "futures-core",
+ "futures-util",
+ "mio",
+ "num_cpus",
+ "socket2",
+ "tokio",
+ "tracing",
+]
+
+[[package]]
+name = "actix-service"
+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b894941f818cfdc7ccc4b9e60fa7e53b5042a2e8567270f9147d5591893373a"
+dependencies = [
+ "futures-core",
+ "paste",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "actix-utils"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e491cbaac2e7fc788dfff99ff48ef317e23b3cf63dbaf7aaab6418f40f92aa94"
+dependencies = [
+ "local-waker",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "actix-web"
+version = "4.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4e5ebffd51d50df56a3ae0de0e59487340ca456f05dd0b90c0a7a6dd6a74d31"
+dependencies = [
+ "actix-codec",
+ "actix-http",
+ "actix-macros",
+ "actix-router",
+ "actix-rt",
+ "actix-server",
+ "actix-service",
+ "actix-utils",
+ "actix-web-codegen",
+ "ahash",
+ "bytes",
+ "bytestring",
+ "cfg-if",
+ "cookie",
+ "derive_more",
+ "encoding_rs",
+ "futures-core",
+ "futures-util",
+ "itoa 1.0.1",
+ "language-tags",
+ "log",
+ "mime",
+ "once_cell",
+ "pin-project-lite",
+ "regex",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "smallvec",
+ "socket2",
+ "time 0.3.9",
+ "url",
+]
+
+[[package]]
+name = "actix-web-codegen"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7525bedf54704abb1d469e88d7e7e9226df73778798a69cea5022d53b2ae91bc"
+dependencies = [
+ "actix-router",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "adler32"
 version = "1.2.0"
@@ -39,6 +247,17 @@ dependencies = [
  "opaque-debug",
 ]
 
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom 0.2.6",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.18"
@@ -48,6 +267,27 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "alloc-no-stdlib"
+version = "2.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "35ef4730490ad1c4eae5c4325b2a95f521d023e5c885853ff7aca0a6a1631db3"
+
+[[package]]
+name = "alloc-stdlib"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "697ed7edc0f1711de49ce108c541623a0af97c6c60b2f6e2b65229847ac843c2"
+dependencies = [
+ "alloc-no-stdlib",
+]
+
+[[package]]
+name = "askama_escape"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "619743e34b5ba4e9703bba34deac3427c72507c7159f5fd030aea8cac0cfe341"
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -75,6 +315,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bf7fe51849ea569fd452f37822f606a5cabb684dc918707a0193fd4664ff324"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "block-modes"
 version = "0.7.0"
@@ -91,6 +340,27 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d696c370c750c948ada61c69a0ee2cbbb9c50b1019ddb86d9317157a99c2cae"
 
+[[package]]
+name = "brotli"
+version = "3.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1a0b1dbcc8ae29329621f8d4f0d835787c1c38bb1401979b49d13b0b305ff68"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+ "brotli-decompressor",
+]
+
+[[package]]
+name = "brotli-decompressor"
+version = "2.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59ad2d4653bf5ca36ae797b1f4bb4dbddb60ce49ca4aed8a2ce4829f60425b80"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.9.1"
@@ -109,11 +379,23 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4872d67bab6358e59559027aa3b9157c53d9358c51423c17554809a8858e0f8"
 
+[[package]]
+name = "bytestring"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90706ba19e97b90786e19dc0d5e2abd80008d99d4c0c5d1ad0b5e72cec7c494d"
+dependencies = [
+ "bytes",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
+dependencies = [
+ "jobserver",
+]
 
 [[package]]
 name = "cfg-if"
@@ -149,6 +431,17 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
 
+[[package]]
+name = "cookie"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94d4706de1b0fa5b132270cddffa8585166037822e260a944fe161acd137ca05"
+dependencies = [
+ "percent-encoding",
+ "time 0.3.9",
+ "version_check",
+]
+
 [[package]]
 name = "cpufeatures"
 version = "0.2.2"
@@ -158,6 +451,25 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "crypto-common"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57952ca27b5e3606ff4dd79b0020231aaf9d6aa76dc05fd30137538c50bd3ce8"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
 [[package]]
 name = "cssparser"
 version = "0.27.2"
@@ -216,6 +528,16 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "digest"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2fb860ca6fafa5552fb6d0e816a69c8e49f0908bf524e30a90d97c85892d506"
+dependencies = [
+ "block-buffer 0.10.2",
+ "crypto-common",
+]
+
 [[package]]
 name = "doc-comment"
 version = "0.3.3"
@@ -278,6 +600,24 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "firestorm"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d3d6188b8804df28032815ea256b6955c9625c24da7525f387a7af02fbb8f01"
+
+[[package]]
+name = "flate2"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e6988e897c1c9c485f43b47a529cef42fde0547f9d8d41a7062518f1d8fc53f"
+dependencies = [
+ "cfg-if",
+ "crc32fast",
+ "libc",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -519,6 +859,12 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "http-range"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21dec9db110f5f872ed9699c3ecf50cf16f423502706ba5c72462e28d3157573"
+
 [[package]]
 name = "httparse"
 version = "1.6.0"
@@ -625,6 +971,15 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
 
+[[package]]
+name = "jobserver"
+version = "0.1.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af25a77299a7f711a01975c35a6a424eb6862092cc2d6c72c4ed6cbc56dfc1fa"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "jpeg-decoder"
 version = "0.1.22"
@@ -640,6 +995,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "language-tags"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4345964bb142484797b161f473a503a434de77149dd8c7427788c6e13379388"
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -652,6 +1013,24 @@ version = "0.2.121"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "efaa7b300f3b5fe8eb6bf21ce3895e1751d9665086af2d64b42f19701015ff4f"
 
+[[package]]
+name = "local-channel"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6246c68cf195087205a0512559c97e15eaf95198bf0e206d662092cdcb03fe9f"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+ "futures-util",
+ "local-waker",
+]
+
+[[package]]
+name = "local-waker"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "902eb695eb0591864543cbfbf6d742510642a605a61fc5e97fe6ceb5a30ac4fb"
+
 [[package]]
 name = "lock_api"
 version = "0.4.7"
@@ -715,6 +1094,26 @@ version = "0.3.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
 
+[[package]]
+name = "mime_guess"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4192263c238a5f0d0c6bfd21f336a313a4ce1c450542449ca191bb657b4642ef"
+dependencies = [
+ "mime",
+ "unicase",
+]
+
+[[package]]
+name = "miniz_oxide"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a92518e98c078586bc6c934028adcca4c92a53d6a958196de835170a01d84e4b"
+dependencies = [
+ "adler",
+ "autocfg",
+]
+
 [[package]]
 name = "mio"
 version = "0.8.2"
@@ -838,6 +1237,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "paste"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c520e05135d6e763148b6426a837e239041653ba7becd2e538c076c738025fc"
+
 [[package]]
 name = "pdf"
 version = "0.7.2"
@@ -972,6 +1377,8 @@ checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 name = "poop-graph"
 version = "0.1.0"
 dependencies = [
+ "actix-files",
+ "actix-web",
  "bytes",
  "futures",
  "lazy_static",
@@ -982,6 +1389,7 @@ dependencies = [
  "thiserror",
  "time 0.3.9",
  "tokio",
+ "tokio-stream",
  "tokio-util 0.7.1",
  "url",
 ]
@@ -1316,16 +1724,27 @@ dependencies = [
  "stable_deref_trait",
 ]
 
+[[package]]
+name = "sha-1"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "028f48d513f9678cda28f6e4064755b3fbb2af6acd672f2c209b62323f7aea0f"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest 0.10.3",
+]
+
 [[package]]
 name = "sha2"
 version = "0.9.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
 dependencies = [
- "block-buffer",
+ "block-buffer 0.9.0",
  "cfg-if",
  "cpufeatures",
- "digest",
+ "digest 0.9.0",
  "opaque-debug",
 ]
 
@@ -1569,6 +1988,17 @@ dependencies = [
  "webpki",
 ]
 
+[[package]]
+name = "tokio-stream"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50145484efff8818b5ccd256697f36863f587da82cf8b409c53adf1e840798e3"
+dependencies = [
+ "futures-core",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "tokio-util"
 version = "0.6.9"
@@ -1610,6 +2040,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4a1bdf54a7c28a2bbf701e1d2233f6c77f473486b94bee4f9678da5a148dca7f"
 dependencies = [
  "cfg-if",
+ "log",
  "pin-project-lite",
  "tracing-attributes",
  "tracing-core",
@@ -1647,6 +2078,15 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dcf81ac59edc17cc8697ff311e8f5ef2d99fcbd9817b34cec66f90b6c3dfd987"
 
+[[package]]
+name = "unicase"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
+dependencies = [
+ "version_check",
+]
+
 [[package]]
 name = "unicode-bidi"
 version = "0.3.7"
@@ -1906,3 +2346,32 @@ checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
 dependencies = [
  "winapi",
 ]
+
+[[package]]
+name = "zstd"
+version = "0.10.0+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b1365becbe415f3f0fcd024e2f7b45bacfb5bdd055f0dc113571394114e7bdd"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "4.1.4+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f7cd17c9af1a4d6c24beb1cc54b17e2ef7b593dc92f19e9d9acad8b182bbaee"
+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "1.6.3+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc49afa5c8d634e75761feda8c592051e7eeb4683ba827211eb0d731d3402ea8"
+dependencies = [
+ "cc",
+ "libc",
+]

Cargo.toml

@@ -7,6 +7,8 @@ authors = ["xenofem <xenofem@xeno.science>"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+actix-files = "0.6.0"
+actix-web = "4.0.1"
 bytes = "1.1"
 futures = "0.3"
 lazy_static = "1.4"
@@ -17,5 +19,6 @@ scraper = "0.12"
 thiserror = "1"
 time = { version = "0.3.9", features = ["formatting", "macros", "parsing"] }
 tokio = { version = "1", features = ["full"] }
+tokio-stream = "0.1.8"
 tokio-util = { version = "0.7", features = ["codec"] }
 url = "2.2.2"

src/extract.rs

@@ -1,6 +1,4 @@
-use std::collections::HashMap;
+use std::{collections::HashMap, fmt::Write, sync::Arc};
-use std::fmt::Write;
-use std::rc::Rc;
 
 use lazy_static::lazy_static;
 use pdf::{backend::Backend, content::Operation, primitive::Primitive};
@@ -21,15 +19,21 @@ const DATE_DISPLAY_FORMAT: &[time::format_description::FormatItem] =
     time::macros::format_description!("[year]-[month]-[day]");
 
 pub struct DataSet {
-    pub columns: Vec<Rc<String>>,
+    pub columns: Vec<Arc<String>>,
     pub rows: Vec<DataPoint>,
 }
 
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("PDF contained no data rows")]
+    NoData,
+}
+
 impl DataSet {
-    pub fn extract<B: Backend>(doc: &pdf::file::File<B>) -> Option<Self> {
+    pub fn extract<B: Backend>(doc: &pdf::file::File<B>) -> Result<Self, Error> {
         let mut doc_iter = DocumentIterator::new(doc).peekable();
 
-        let mut columns: Vec<(Rc<String>, f32)> = Vec::new();
+        let mut columns: Vec<(Arc<String>, f32)> = Vec::new();
         let mut rows: Vec<DataPoint> = Vec::new();
 
         let (mut current_datapoint, mut current_y) = loop {
@@ -39,7 +43,7 @@ impl DataSet {
                     let column_x = text.x;
                     while let Some(more) = doc_iter.peek() {
                         if is_new_column_header(&more.text) || DATE_REGEX.is_match(&more.text) {
-                            columns.push((Rc::new(column_name), column_x));
+                            columns.push((Arc::new(column_name), column_x));
                             break;
                         }
                         column_name += " ";
@@ -53,7 +57,7 @@ impl DataSet {
                     );
                 }
             } else {
-                return None;
+                return Err(Error::NoData);
             }
         };
 
@@ -79,21 +83,21 @@ impl DataSet {
             }
         }
 
-        Some(Self {
+        Ok(Self {
             columns: columns.into_iter().map(|(column, _)| column).collect(),
             rows,
         })
     }
 
-    pub fn csv_rows(&self) -> impl Iterator<Item = Result<String, std::fmt::Error>> + '_ {
+    pub fn csv_header(&self) -> Result<String, std::fmt::Error> {
-        std::iter::once_with(|| {
         let mut header = String::from("Date");
         for column in self.columns.iter() {
             write!(&mut header, ",{}", column)?;
         }
         Ok(header)
-        })
+    }
-        .chain(self.rows.iter().map(|datapoint| {
+
+    pub fn csv_row(&self, datapoint: &DataPoint) -> Result<String, std::fmt::Error> {
         let mut csv_row = datapoint
             .date
             .format(DATE_DISPLAY_FORMAT)
@@ -106,13 +110,17 @@ impl DataSet {
             }
         }
         Ok(csv_row)
-        }))
+    }
+
+    pub fn csv_rows(&self) -> impl Iterator<Item = Result<String, std::fmt::Error>> + '_ {
+        std::iter::once_with(|| self.csv_header())
+            .chain(self.rows.iter().map(|datapoint| self.csv_row(datapoint)))
     }
 }
 
 pub struct DataPoint {
     pub date: Date,
-    pub values: HashMap<Rc<String>, u32>,
+    pub values: HashMap<Arc<String>, u32>,
 }
 
 impl DataPoint {

src/main.rs

@@ -1,15 +1,118 @@
+use std::{sync::Arc, time::Duration};
+
+use actix_web::{get, web, App, HttpResponse, HttpServer, Responder};
+use lazy_static::lazy_static;
+use tokio::sync::RwLock;
+
 mod extract;
 mod fetch;
 
 use extract::DataSet;
 use fetch::PdfFetcher;
 
-#[tokio::main]
+lazy_static! {
-async fn main() {
+    static ref UPDATE_INTERVAL: Duration = Duration::from_secs(3600);
-    let mut fetcher = PdfFetcher::new().expect("Failed to initialize PDF fetcher");
+}
-    let doc = fetcher.fetch().await.expect("Failed to fetch PDF");
+
-    let dataset = DataSet::extract(&doc).expect("Failed to extract dataset");
+struct AppState {
-    for row in dataset.csv_rows() {
+    dataset: RwLock<Arc<DataSet>>,
-        println!("{}", row.unwrap());
+}
+
+#[derive(thiserror::Error, Debug)]
+enum Error {
+    #[error("Failed to fetch PDF")]
+    Fetch(#[from] fetch::Error),
+    #[error("Failed to extract data from PDF")]
+    Extract(#[from] extract::Error),
+}
+
+async fn load_data(fetcher: &mut PdfFetcher) -> Result<DataSet, Error> {
+    Ok(DataSet::extract(&fetcher.fetch().await?)?)
+}
+
+async fn try_update(state: &AppState, fetcher: &mut PdfFetcher) -> Result<(), Error> {
+    *state.dataset.write().await = Arc::new(load_data(fetcher).await?);
+    Ok(())
+}
+
+async fn start_updater() -> Result<web::Data<AppState>, Error> {
+    let mut fetcher = PdfFetcher::new()?;
+    let state = web::Data::new(AppState {
+        dataset: RwLock::new(Arc::new(load_data(&mut fetcher).await?)),
+    });
+
+    let state_copy = state.clone();
+    std::thread::spawn(move || {
+        actix_web::rt::System::new().block_on(async {
+            loop {
+                if let Err(e) = try_update(&state_copy, &mut fetcher).await {
+                    eprintln!("Error updating data: {:#?}", e);
+                }
+                actix_web::rt::time::sleep(*UPDATE_INTERVAL).await;
+            }
+        });
+    });
+
+    Ok(state)
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    let state = start_updater().await.expect("Failed to initialize state");
+
+    HttpServer::new(move || {
+        App::new()
+            .app_data(state.clone())
+            .service(csv)
+            .service(actix_files::Files::new("/", "./static/").index_file("index.html"))
+    })
+    .bind("127.0.0.1:8080")?
+    .run()
+    .await
+}
+
+struct DataIterator {
+    dataset: Arc<DataSet>,
+    index: Option<usize>,
+}
+
+impl DataIterator {
+    fn new(dataset: Arc<DataSet>) -> Self {
+        Self {
+            dataset,
+            index: None,
         }
     }
+}
+
+impl Iterator for DataIterator {
+    type Item = Result<String, std::fmt::Error>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self.index {
+            None => {
+                self.index = Some(0);
+                Some(self.dataset.csv_header().map(|s| s + "\n"))
+            }
+            Some(i) => {
+                if let Some(row) = self.dataset.rows.get(i) {
+                    self.index = Some(i + 1);
+                    Some(self.dataset.csv_row(row).map(|s| s + "\n"))
+                } else {
+                    None
+                }
+            }
+        }
+    }
+}
+
+#[get("/data.csv")]
+async fn csv(data: web::Data<AppState>) -> impl Responder {
+    let dataset = { data.dataset.read().await.clone() };
+
+    let rows =
+        tokio_stream::iter(DataIterator::new(dataset).map(|item| item.map(bytes::Bytes::from)));
+    HttpResponse::Ok()
+        .content_type("text/csv; charset=utf-8")
+        .body(actix_web::body::BodyStream::new(rows))
+}