├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── README.md
└── src
    ├── config.rs
    ├── downloader.rs
    ├── image_processing.rs
    ├── kafka.rs
    ├── main.rs
    ├── model.rs
    └── s3_publisher.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | .idea/
3 | 


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2654 | 
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2656 | name = "version_check"
2657 | version = "0.9.1"
2658 | source = "registry+https://github.com/rust-lang/crates.io-index"
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2665 | checksum = "b6395efa4784b027708f7451087e647ec73cc74f5d9bc2e418404248d679a230"
2666 | dependencies = [
2667 |  "futures 0.1.29",
2668 |  "log",
2669 |  "try-lock",
2670 | ]
2671 | 
2672 | [[package]]
2673 | name = "want"
2674 | version = "0.3.0"
2675 | source = "registry+https://github.com/rust-lang/crates.io-index"
2676 | checksum = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
2677 | dependencies = [
2678 |  "log",
2679 |  "try-lock",
2680 | ]
2681 | 
2682 | [[package]]
2683 | name = "wasi"
2684 | version = "0.9.0+wasi-snapshot-preview1"
2685 | source = "registry+https://github.com/rust-lang/crates.io-index"
2686 | checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
2687 | 
2688 | [[package]]
2689 | name = "wasm-bindgen"
2690 | version = "0.2.58"
2691 | source = "registry+https://github.com/rust-lang/crates.io-index"
2692 | checksum = "5205e9afdf42282b192e2310a5b463a6d1c1d774e30dc3c791ac37ab42d2616c"
2693 | dependencies = [
2694 |  "cfg-if",
2695 |  "serde",
2696 |  "serde_json",
2697 |  "wasm-bindgen-macro",
2698 | ]
2699 | 
2700 | [[package]]
2701 | name = "wasm-bindgen-backend"
2702 | version = "0.2.58"
2703 | source = "registry+https://github.com/rust-lang/crates.io-index"
2704 | checksum = "11cdb95816290b525b32587d76419facd99662a07e59d3cdb560488a819d9a45"
2705 | dependencies = [
2706 |  "bumpalo",
2707 |  "lazy_static",
2708 |  "log",
2709 |  "proc-macro2 1.0.8",
2710 |  "quote 1.0.2",
2711 |  "syn 1.0.14",
2712 |  "wasm-bindgen-shared",
2713 | ]
2714 | 
2715 | [[package]]
2716 | name = "wasm-bindgen-futures"
2717 | version = "0.4.8"
2718 | source = "registry+https://github.com/rust-lang/crates.io-index"
2719 | checksum = "8bbdd49e3e28b40dec6a9ba8d17798245ce32b019513a845369c641b275135d9"
2720 | dependencies = [
2721 |  "cfg-if",
2722 |  "js-sys",
2723 |  "wasm-bindgen",
2724 |  "web-sys",
2725 | ]
2726 | 
2727 | [[package]]
2728 | name = "wasm-bindgen-macro"
2729 | version = "0.2.58"
2730 | source = "registry+https://github.com/rust-lang/crates.io-index"
2731 | checksum = "574094772ce6921576fb6f2e3f7497b8a76273b6db092be18fc48a082de09dc3"
2732 | dependencies = [
2733 |  "quote 1.0.2",
2734 |  "wasm-bindgen-macro-support",
2735 | ]
2736 | 
2737 | [[package]]
2738 | name = "wasm-bindgen-macro-support"
2739 | version = "0.2.58"
2740 | source = "registry+https://github.com/rust-lang/crates.io-index"
2741 | checksum = "e85031354f25eaebe78bb7db1c3d86140312a911a106b2e29f9cc440ce3e7668"
2742 | dependencies = [
2743 |  "proc-macro2 1.0.8",
2744 |  "quote 1.0.2",
2745 |  "syn 1.0.14",
2746 |  "wasm-bindgen-backend",
2747 |  "wasm-bindgen-shared",
2748 | ]
2749 | 
2750 | [[package]]
2751 | name = "wasm-bindgen-shared"
2752 | version = "0.2.58"
2753 | source = "registry+https://github.com/rust-lang/crates.io-index"
2754 | checksum = "f5e7e61fc929f4c0dddb748b102ebf9f632e2b8d739f2016542b4de2965a9601"
2755 | 
2756 | [[package]]
2757 | name = "wasm-bindgen-webidl"
2758 | version = "0.2.58"
2759 | source = "registry+https://github.com/rust-lang/crates.io-index"
2760 | checksum = "ef012a0d93fc0432df126a8eaf547b2dce25a8ce9212e1d3cbeef5c11157975d"
2761 | dependencies = [
2762 |  "anyhow",
2763 |  "heck",
2764 |  "log",
2765 |  "proc-macro2 1.0.8",
2766 |  "quote 1.0.2",
2767 |  "syn 1.0.14",
2768 |  "wasm-bindgen-backend",
2769 |  "weedle",
2770 | ]
2771 | 
2772 | [[package]]
2773 | name = "web-sys"
2774 | version = "0.3.35"
2775 | source = "registry+https://github.com/rust-lang/crates.io-index"
2776 | checksum = "aaf97caf6aa8c2b1dac90faf0db529d9d63c93846cca4911856f78a83cebf53b"
2777 | dependencies = [
2778 |  "anyhow",
2779 |  "js-sys",
2780 |  "sourcefile",
2781 |  "wasm-bindgen",
2782 |  "wasm-bindgen-webidl",
2783 | ]
2784 | 
2785 | [[package]]
2786 | name = "weedle"
2787 | version = "0.10.0"
2788 | source = "registry+https://github.com/rust-lang/crates.io-index"
2789 | checksum = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
2790 | dependencies = [
2791 |  "nom",
2792 | ]
2793 | 
2794 | [[package]]
2795 | name = "winapi"
2796 | version = "0.2.8"
2797 | source = "registry+https://github.com/rust-lang/crates.io-index"
2798 | checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
2799 | 
2800 | [[package]]
2801 | name = "winapi"
2802 | version = "0.3.8"
2803 | source = "registry+https://github.com/rust-lang/crates.io-index"
2804 | checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
2805 | dependencies = [
2806 |  "winapi-i686-pc-windows-gnu",
2807 |  "winapi-x86_64-pc-windows-gnu",
2808 | ]
2809 | 
2810 | [[package]]
2811 | name = "winapi-build"
2812 | version = "0.1.1"
2813 | source = "registry+https://github.com/rust-lang/crates.io-index"
2814 | checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
2815 | 
2816 | [[package]]
2817 | name = "winapi-i686-pc-windows-gnu"
2818 | version = "0.4.0"
2819 | source = "registry+https://github.com/rust-lang/crates.io-index"
2820 | checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
2821 | 
2822 | [[package]]
2823 | name = "winapi-x86_64-pc-windows-gnu"
2824 | version = "0.4.0"
2825 | source = "registry+https://github.com/rust-lang/crates.io-index"
2826 | checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
2827 | 
2828 | [[package]]
2829 | name = "winreg"
2830 | version = "0.6.2"
2831 | source = "registry+https://github.com/rust-lang/crates.io-index"
2832 | checksum = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
2833 | dependencies = [
2834 |  "winapi 0.3.8",
2835 | ]
2836 | 
2837 | [[package]]
2838 | name = "ws2_32-sys"
2839 | version = "0.2.1"
2840 | source = "registry+https://github.com/rust-lang/crates.io-index"
2841 | checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
2842 | dependencies = [
2843 |  "winapi 0.2.8",
2844 |  "winapi-build",
2845 | ]
2846 | 
2847 | [[package]]
2848 | name = "xml-rs"
2849 | version = "0.8.0"
2850 | source = "registry+https://github.com/rust-lang/crates.io-index"
2851 | checksum = "541b12c998c5b56aa2b4e6f18f03664eef9a4fd0a246a55594efae6cc2d964b5"
2852 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "downloader"
 3 | version = "0.1.0"
 4 | authors = ["Marco Amann <marco@amann.dev>"]
 5 | edition = "2018"
 6 | 
 7 | [dependencies]
 8 | # tokio runtime and utilities
 9 | tokio = { version = "0.2.0", features = ["full"] }
10 | futures = "0.3"
11 | futures-util = "0.3.1"
12 | bytes = "0.5.4"
13 | 
14 | # communication with kafka
15 | rdkafka = "0.23.1"
16 | 
17 | # for downloading images
18 | reqwest = { version = "0.10", features = ["json"] }
19 | 
20 | # image processing
21 | image = "0.22.4"
22 | 
23 | # allows for uploading stuff to s3
24 | rust-s3 = "0.18.11"
25 | 
26 | # what could this be for...
27 | log = "0.4.8"
28 | simple_logger = "1.4.0"
29 | 
30 | # config from parameters/env
31 | structopt = "0.3"
32 | 
33 | # parsing and deparsing messages received via kafka
34 | serde = "1.0.104"
35 | serde_json = "1.0.48"
36 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # rust-microservice-kafka 
2 | 
3 | This is the source code for our [Blog Post](https://medium.com/digitalfrontiers/microservices-in-rust-with-kafka-2b671295b24e).
4 | 
5 | Although the service is rather incomplete, you might find some of the implemented patterns useful.
6 | 
7 | To run it yourself, you need to have a Kafka and S3-compatible object storgae available. These can be configured via commandline parameters.
8 | To test image processing, the management service can be connected to kafka to create download tasks.
9 | 


--------------------------------------------------------------------------------
/src/config.rs:
--------------------------------------------------------------------------------
 1 | use structopt::StructOpt;
 2 | use log::Level;
 3 | 
 4 | /**
 5 |     Obviously defaults are not the best idea here, so please remove them if you copy paste this code.
 6 | */
 7 | #[derive(StructOpt, Debug, Clone)]
 8 | #[structopt(name = "downloader")]
 9 | pub struct ConverterConfig{
10 |     #[structopt(short="r", long, default_value = "eu-east2", env = "S3_REGION_NAME")]
11 |     pub s3_region_name: String,
12 | 
13 |     #[structopt(short, long, default_value = "http://127.0.0.1:9099")]
14 |     pub s3_endpoint: String,
15 | 
16 |     #[structopt(short, long, default_value = "minioadmin")]
17 |     pub s3_access: String,
18 | 
19 |     #[structopt(short, long, default_value = "minioadmin")]
20 |     pub s3_secret: String,
21 | 
22 |     #[structopt(short, long, default_value = "foobar")]
23 |     pub s3_bucket_name: String,
24 | 
25 |     #[structopt(short, long, default_value = "converter_tasks")]
26 |     pub kafka_input_topic: String,
27 | 
28 |     #[structopt(short, long, default_value = "converter_results")]
29 |     pub kafka_output_topic: String,
30 | 
31 |     #[structopt(short, long, default_value = "127.0.0.1:9092")]
32 |     pub kafka_brokers: String,
33 | 
34 |     #[structopt(short, long, default_value = "converter_group")]
35 |     pub kafka_consumer_group: String,
36 | 
37 |     #[structopt(short, long, default_value = "info")]
38 |     pub log_level: Level,
39 | 
40 |     #[structopt(short, long, default_value = "5")]
41 |     pub parallel_operations: usize,
42 | }


--------------------------------------------------------------------------------
/src/downloader.rs:
--------------------------------------------------------------------------------
 1 | use bytes::{BytesMut, Bytes};
 2 | use std::error::Error;
 3 | use log::debug;
 4 | use crate::model::NetworkError;
 5 | 
 6 | pub async fn download_url(url: String) -> Result<Bytes, Box<dyn Error + Send + Sync> >{
 7 | 
 8 |     let mut body = reqwest::get(&url).await?;
 9 | 
10 |     let code = body.status();
11 | 
12 |     match code.as_u16() {
13 |         200 => {
14 |             let mut res = BytesMut::new();
15 |             let mut total_len = 0;
16 |             while let Some(chunk) = body.chunk().await? {
17 |                 total_len+=chunk.len();
18 |                 if  total_len > 20*1024*1024{
19 |                     return Err(Box::new(NetworkError::DownloadSizeLimitReached(total_len as u16)));
20 |                 }
21 |                 res.extend_from_slice(&chunk);
22 |             }
23 |             debug!("Downloaded data of size: {} bytes",total_len);
24 |             let body = res.freeze();
25 |             Ok(body)
26 |         }
27 |         _ => {
28 |             Err(NetworkError::DownloadError(code.canonical_reason().unwrap_or("Unknown HTTP error").into()).into())
29 |         }
30 |     }
31 | 
32 | 
33 | }


--------------------------------------------------------------------------------
/src/image_processing.rs:
--------------------------------------------------------------------------------
 1 | use bytes::{Bytes};
 2 | use std::error::Error;
 3 | use std::io::Cursor;
 4 | use image::jpeg::JPEGDecoder;
 5 | use image::DynamicImage;
 6 | use image::ImageFormat::JPEG;
 7 | 
 8 | /**
 9 |     Process the image, generate a thumbnail and return both, the original and the thumbnail
10 | */
11 | pub fn process_image(input_bytes: Bytes) -> Result<(Bytes,Bytes), Box<dyn Error + Send + Sync> >{
12 | 
13 |     let full_size_image = input_bytes.clone();
14 |     let cursor = Cursor::new(input_bytes);
15 | 
16 |     let dec = JPEGDecoder::new(cursor)?;
17 |     let di = DynamicImage::from_decoder(dec)?;
18 | 
19 |     let processed = di.thumbnail(128,128);
20 | 
21 |     let mut v = Vec::new();
22 |     processed.write_to(&mut v,JPEG)?;
23 | 
24 |     Ok((full_size_image,Bytes::copy_from_slice(&v)))
25 | }
26 | 


--------------------------------------------------------------------------------
/src/kafka.rs:
--------------------------------------------------------------------------------
  1 | use std::error::Error;
  2 | use std::convert::TryFrom;
  3 | 
  4 | use rdkafka::consumer::{StreamConsumer};
  5 | use rdkafka::{ClientConfig, Message};
  6 | use rdkafka::config::RDKafkaLogLevel;
  7 | use rdkafka::consumer::Consumer;
  8 | use rdkafka::producer::{FutureProducer, FutureRecord};
  9 | 
 10 | 
 11 | 
 12 | use tokio::stream::StreamExt;
 13 | use log::{debug,info,error};
 14 | 
 15 | use crate::downloader::download_url;
 16 | use crate::image_processing::process_image;
 17 | use crate::config::ConverterConfig;
 18 | use crate::s3_publisher::push_to_s3;
 19 | use crate::model::{DownloadTask, DownloadResult, ProcessingResult};
 20 | 
 21 | 
 22 | 
 23 | 
 24 | /**
 25 |     Handling each and every message
 26 |     Note the stacked matches: We need to commit the message whenever processing finished (Ok or err)
 27 | */
 28 | pub async fn receive_messages(cfg: ConverterConfig){
 29 | 
 30 |     let consumer = create_consumer(
 31 |         &cfg.kafka_brokers,
 32 |         &cfg.kafka_consumer_group,
 33 |         &cfg.kafka_input_topic);
 34 | 
 35 |     let producer = create_producer(&cfg.kafka_brokers);
 36 |     let output_topic = cfg.kafka_output_topic.to_owned();
 37 | 
 38 |     let mut msg_stream = consumer.start();
 39 | 
 40 |     // iterate over all messages blocking
 41 |     while let Some(msg) = msg_stream.next().await{
 42 |         // we cant borrow cfg to the async function, since that would require static a lifetime
 43 |         // therefore, we copy it (meh...)
 44 |         let cfg = cfg.clone();
 45 | 
 46 | 
 47 |         // the message itself can be broken
 48 |         match msg {
 49 |             Ok(msg) => {
 50 | 
 51 |                 // tha payload can be empty
 52 |                 match  msg.payload() {
 53 |                     Some(payload) => {
 54 |                         let request = DownloadTask::try_from(payload);
 55 | 
 56 |                         // only process valid messages
 57 |                         match request {
 58 |                             Ok(request) => {
 59 |                                 handle_received_message(cfg, &producer, &output_topic, request).await;
 60 |                             }
 61 |                             Err(e) => {
 62 |                                 error!("Error parsing payload: {}",e);
 63 |                             }
 64 |                         }
 65 |                     },
 66 |                     None => {
 67 |                         error!("Message with empty payload");
 68 |                     }
 69 |                 }
 70 | 
 71 |                 // now we can store the offset to be committed in the next auto-commit so this
 72 |                 // message will never be processed again
 73 |                 let res = consumer.store_offset(&msg);
 74 |                 match res{
 75 |                     Ok(()) => {}
 76 |                     Err(e) => error!("Could not commit message: {} ", e)
 77 |                 }
 78 |             }
 79 |             Err(e)=>{
 80 |                 error!("Could not receive and will not process message: {}",e)
 81 |             }
 82 |         };
 83 |     }
 84 | }
 85 | 
 86 | async fn handle_received_message(cfg: ConverterConfig, producer: &FutureProducer, output_topic: &String, request: DownloadTask) {
 87 | 
 88 |     let correlation_id = request.correlation_id;
 89 |     let handle_result = process(request, cfg).await;
 90 | 
 91 |     let (res, description) = match handle_result {
 92 |         Ok(_) => (ProcessingResult::Ok, String::from("")),
 93 |         Err(e) => (ProcessingResult::Error, format!("{}", e)),
 94 |     };
 95 | 
 96 |     let dr = DownloadResult {
 97 |         correlation_id: correlation_id,
 98 |         res,
 99 |         description
100 |     };
101 | 
102 |     // if the result can not be serialized, we rather send an empty string than to crash
103 |     let dr_str_rep = serde_json::to_string(&dr).unwrap_or("".into());
104 | 
105 |     info!("Answer: {}", dr_str_rep);
106 | 
107 |     // this sends the "reply" to the other topic
108 |     let res =
109 |         send_ready_notification(&producer, output_topic.clone(), dr_str_rep).await;
110 |     if res.is_err(){error!("Error sending ack: {}", res.err().expect("Fatal: could not send ack"))}
111 | }
112 | 
113 | 
114 | pub async fn process(request: DownloadTask, cfg: ConverterConfig)
115 |                      -> Result<(), Box<dyn Error + Send + Sync> >{
116 | 
117 |     let bytes = download_url(request.url.into()).await?;
118 | 
119 |     let both_bytes = tokio::task::spawn_blocking(|| process_image(bytes)).await??;
120 | 
121 |     push_to_s3(both_bytes.0,cfg.clone(), request.target_path.clone()).await?;
122 |     push_to_s3(both_bytes.1,cfg.clone(), request.target_thumbnail_path.clone()).await?;
123 | 
124 |     info!("Finished Download for {}",request.target_path);
125 | 
126 |     Ok(())
127 | }
128 | 
129 | 
130 | pub async fn send_ready_notification(producer: &FutureProducer, topic: String, record: String)
131 |                                      -> Result<(), Box<dyn Error + Send + Sync> >{
132 | 
133 |     let record = FutureRecord::to(&topic)
134 |         .key("some key".into())
135 |         .payload(&record);
136 | 
137 |     let produce_future = producer.send(record,0);
138 |     match produce_future.await {
139 |         Ok(Ok(delivery)) => debug!("Sent: {:?}", delivery),
140 |         Ok(Err((e, _))) => error!("Error: {:?}", e),
141 |         Err(_) => error!("Future cancelled"),
142 |     }
143 |     Ok(())
144 | }
145 | 
146 | 
147 | 
148 | pub fn create_producer(brokers: &str, ) -> FutureProducer {
149 |     let producer: FutureProducer = ClientConfig::new()
150 |         .set("bootstrap.servers", &brokers)
151 |         .set("message.timeout.ms", "5000")
152 |         .create()
153 |         .expect("Producer creation error");
154 |     producer
155 | }
156 | 
157 | 
158 | pub fn create_consumer(brokers: &str, group_id: &str, topic: &str) -> StreamConsumer {
159 | 
160 |     let consumer: StreamConsumer  = ClientConfig::new()
161 |         .set("group.id", group_id)
162 |         .set("bootstrap.servers", brokers)
163 |         .set("enable.partition.eof", "false")
164 |         .set("session.timeout.ms", "6000")
165 |         .set("enable.auto.commit", "true")
166 |         .set("auto.commit.interval.ms", "1000")
167 |         .set("enable.auto.offset.store", "false")
168 |         .set_log_level(RDKafkaLogLevel::Debug)
169 |         .create()
170 |         .expect("Consumer creation failed");
171 | 
172 |     consumer
173 |         .subscribe(&[topic])
174 |         .expect("Can't subscribe to specified topic");
175 | 
176 |     consumer
177 | }
178 | 
179 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
 1 | use tokio::runtime::Runtime;
 2 | 
 3 | use structopt::StructOpt;
 4 | use log::info;
 5 | 
 6 | mod config;
 7 | mod kafka;
 8 | mod downloader;
 9 | mod image_processing;
10 | mod s3_publisher;
11 | mod model;
12 | 
13 | use config::ConverterConfig;
14 | 
15 | use futures::future::join_all;
16 | 
17 | 
18 | fn main() {
19 |     
20 |     let cfg = ConverterConfig::from_args();
21 | 
22 |     simple_logger::init_with_level(cfg.log_level).expect("Could not init logger");
23 |     info!("Logging initialized with level {}", cfg.log_level);
24 | 
25 |     // Spawn a set of workers.
26 |     // This has to be in an async task to have access to the `tokio::spawn` primitive
27 |     Runtime::new().unwrap().block_on(async {
28 |         let futures =
29 |             (0..cfg.parallel_operations)
30 |             .map(|_| {
31 |                 tokio::spawn(
32 |                     kafka::receive_messages(cfg.clone())
33 |                 )
34 |             });
35 | 
36 |         // wait for all workers to finish
37 |         join_all(futures).await;
38 |     });
39 | }
40 | 


--------------------------------------------------------------------------------
/src/model.rs:
--------------------------------------------------------------------------------
 1 | use serde::{Serialize, Deserialize};
 2 | use std::convert::TryFrom;
 3 | use std::error::Error;
 4 | use std::fmt::Display;
 5 | use std::fmt;
 6 | 
 7 | /**
 8 |     A download task as used with the management application
 9 |     We need to keep the field names (or at least what they will be serialized to), in sync with
10 |     the version in the management service.
11 | */
12 | #[derive(Serialize, Deserialize, Debug)]
13 | pub struct DownloadTask{
14 |     pub correlation_id: u32,
15 |     pub url: String,
16 |     pub target_path: String,
17 |     pub target_thumbnail_path: String
18 | }
19 | 
20 | impl TryFrom<&[u8]> for DownloadTask{
21 |     type Error = Box<dyn Error + Send + Sync> ;
22 |     fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
23 |         serde_json::from_slice(bytes)
24 |             // we allow rust to loose the type, so the next line is equivalent to this:
25 |             //.map_err(|e|Box::new(e ) as Box<dyn Error + Send + Sync>)
26 |             .map_err(|e|e.into())
27 |     }
28 | }
29 | #[derive(Serialize, Deserialize, Debug)]
30 | pub struct DownloadResult{
31 |     pub correlation_id: u32,
32 |     pub res: ProcessingResult,
33 |     pub description: String
34 | }
35 | 
36 | #[derive(Debug)]
37 | pub enum NetworkError {
38 |     DownloadSizeLimitReached(u16),
39 |     DownloadError(String),
40 |     UploadBucketAccessError(String),
41 |     UploadPutError(String)
42 | }
43 | 
44 | 
45 | impl Display for NetworkError {
46 |     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
47 |         match self{
48 |             NetworkError::DownloadSizeLimitReached(size) => write!(f, "DownloadSizeLimitReached: {}",size),
49 |             NetworkError::DownloadError(msg) => write!(f, "DownloadError: {}",msg),
50 |             NetworkError::UploadBucketAccessError(msg) => {write!(f, "UploadBucketAccessError: {}",msg)},
51 |             NetworkError::UploadPutError(msg) => {write!(f, "UploadPutError: {}",msg)}
52 |         }
53 |     }
54 | }
55 | impl Error for NetworkError {}
56 | 
57 | 
58 | #[derive(Serialize, Deserialize, Debug)]
59 | pub enum ProcessingResult {
60 |     Ok,
61 |     Error
62 | }


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/src/s3_publisher.rs:
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 1 | 
 2 | 
 3 | use s3::bucket::Bucket;
 4 | use s3::credentials::Credentials;
 5 | 
 6 | use s3::region::Region;
 7 | use bytes::Bytes;
 8 | use crate::config::ConverterConfig;
 9 | use std::error::Error;
10 | use crate::model::NetworkError;
11 | 
12 | /**
13 |     Push a bunch of bytes (from an image) to s3
14 |     We use a fresh HTTP client for every image, since the URLs might change for every received message
15 |     Since the S3 library is a bit broken, we botch the error handling here
16 |  */
17 | pub async fn push_to_s3(bytes: Bytes, config: ConverterConfig, target_path: String)
18 |     ->Result<(), Box<dyn Error + Send + Sync> > {
19 | 
20 |     // since the S3 library does not support uploading in a future out of the box, we wrap it in one
21 |     // this is blocking and therefore spawned in the blocking thread pool of tokio
22 |     tokio::task::spawn_blocking(move || {
23 |         get_bucket_accessor(&config)
24 |             .and_then(|bucket|
25 |                 bucket
26 |                     .put_object(&target_path, &bytes, "image/jpg")
27 |                     .map(|_| ()) // we don't need the result since it is broken anyway
28 |                     .map_err(|e|
29 |                         Box::new(NetworkError::UploadPutError(
30 |                             e.description.unwrap_or("Generic upload error".into()).into())
31 |                         ).into()
32 |                     )
33 |             )
34 |     }).await?
35 | }
36 | 
37 | 
38 | fn get_bucket_accessor(config: &ConverterConfig) -> Result<Bucket, Box<dyn Error + Send + Sync> > {
39 |     let bucket_name = &config.s3_bucket_name.clone();
40 |     let aws_access = config.s3_access.clone();
41 |     let aws_secret = config.s3_secret.clone();
42 | 
43 |     let region_name = config.s3_bucket_name.clone();
44 |     let endpoint = config.s3_endpoint.clone();
45 |     let region = Region::Custom { region: region_name, endpoint };
46 | 
47 |     let credentials: Credentials = Credentials::new(
48 |         Some(aws_access),
49 |         Some(aws_secret),
50 |         None,
51 |         None);
52 | 
53 |     // create the struct for the bucket
54 |     Bucket::new(bucket_name, region, credentials)
55 |         .map_err(|d|
56 |             Box::new(NetworkError::UploadBucketAccessError(
57 |                 d.description.unwrap_or("Generic upload error".into()).into())
58 |             ).into()
59 |         )
60 | }


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