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Merge pull request #17 from graphprotocol/mde/use-ebo-subgraph-for-su…
…pported-networks feat: use epoch block oracle subgraph for supported networks
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| use common::prelude::*; | ||
| use futures::stream; | ||
| use futures::Stream; | ||
| use reqwest::Client; | ||
| use serde_derive::{Deserialize, Serialize}; | ||
| use std::collections::BTreeMap; | ||
| use std::pin::Pin; | ||
| use std::sync::Arc; | ||
|
|
||
| pub trait EpochBlockOracleSubgraph { | ||
| fn supported_networks(self: Arc<Self>) -> Pin<Box<dyn Stream<Item = Result<String, Error>>>>; | ||
| } | ||
|
|
||
| pub struct EpochBlockOracleSubgraphImpl { | ||
| logger: Logger, | ||
| endpoint: String, | ||
| client: Client, | ||
| } | ||
|
|
||
| impl EpochBlockOracleSubgraphImpl { | ||
| pub fn new(logger: Logger, endpoint: String) -> Arc<Self> { | ||
| Arc::new(EpochBlockOracleSubgraphImpl { | ||
| logger, | ||
| endpoint, | ||
| client: Client::new(), | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| #[derive(Serialize)] | ||
| struct GraphqlRequest { | ||
| query: String, | ||
| variables: BTreeMap<String, serde_json::Value>, | ||
| } | ||
|
|
||
| #[derive(Deserialize)] | ||
| struct GraphqlResponse { | ||
| data: Option<BTreeMap<String, serde_json::Value>>, | ||
| errors: Option<Vec<serde_json::Value>>, | ||
| } | ||
|
|
||
| const SUPPORTED_NETWORKS_QUERY: &str = r#" | ||
| query Networks($skip: Int!) { | ||
| networks(first: 1000, skip: $skip) { | ||
| id | ||
| alias | ||
| } | ||
| } | ||
| "#; | ||
|
|
||
| impl EpochBlockOracleSubgraph for EpochBlockOracleSubgraphImpl { | ||
| fn supported_networks(self: Arc<Self>) -> Pin<Box<dyn Stream<Item = Result<String, Error>>>> { | ||
| stream::iter((0..).step_by(1000)) | ||
| .then(move |skip| { | ||
| let this = self.clone(); | ||
| async move { | ||
| let req = GraphqlRequest { | ||
| query: SUPPORTED_NETWORKS_QUERY.to_string(), | ||
| variables: vec![("skip".to_string(), skip.into())] | ||
| .into_iter() | ||
| .collect(), | ||
| }; | ||
|
|
||
| let res: GraphqlResponse = this | ||
| .client | ||
| .post(&this.endpoint) | ||
| .json(&req) | ||
| .send() | ||
| .await? | ||
| .error_for_status()? | ||
| .json() | ||
| .await?; | ||
|
|
||
| if let Some(errs) = res.errors.filter(|errs| !errs.is_empty()) { | ||
| return Err(anyhow!( | ||
| "error querying supported networks from subgraph {}", | ||
| serde_json::to_string(&errs)? | ||
| )); | ||
| } | ||
|
|
||
| let data = res | ||
| .data | ||
| .ok_or_else(|| anyhow!("Data field is missing in the response"))? | ||
| .remove("networks") | ||
| .ok_or_else(|| anyhow!("'networks' field is missing in the data"))?; | ||
|
|
||
| #[derive(Deserialize)] | ||
| #[allow(non_snake_case)] | ||
| struct RawNetwork { | ||
| id: String, | ||
| alias: String, | ||
| } | ||
|
|
||
| let page: Vec<RawNetwork> = serde_json::from_value(data)?; | ||
| let page: Vec<String> = page | ||
| .into_iter() | ||
| .flat_map(|raw_network| vec![raw_network.id, raw_network.alias]) | ||
| .collect(); | ||
|
|
||
| trace!(this.logger, "networks page"; "page_size" => page.len()); | ||
|
|
||
| Ok(page) | ||
| } | ||
| }) | ||
| .take_while(|networks| { | ||
| let keep_paginating = match networks { | ||
| Ok(networks) => !networks.is_empty(), | ||
| Err(_) => true, | ||
| }; | ||
| async move { keep_paginating } | ||
| }) | ||
| .map_ok(|networks| stream::iter(networks.into_iter().map(Ok))) | ||
| .try_flatten() | ||
| .boxed() | ||
| } | ||
| } |
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