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use failure::{bail, Error, ResultExt};
use reqwest::header::{self, HeaderValue};
use reqwest::{Client, Method, RequestBuilder};
use std::borrow::Cow;
use std::collections::HashMap;
static API_BASE: &str = "https://api.github.com/";
static TOKEN_VAR: &str = "GITHUB_TOKEN";
#[derive(serde::Deserialize)]
pub(crate) struct User {
pub(crate) login: String,
pub(crate) name: Option<String>,
pub(crate) email: Option<String>,
}
#[derive(serde::Deserialize)]
struct GraphResult<T> {
data: Option<T>,
#[serde(default)]
errors: Vec<GraphError>,
}
#[derive(serde::Deserialize)]
struct GraphError {
message: String,
}
#[derive(serde::Deserialize)]
struct GraphNodes<T> {
nodes: Vec<Option<T>>,
}
pub(crate) struct GitHubApi {
http: Client,
token: String,
}
impl GitHubApi {
pub(crate) fn new() -> Result<Self, Error> {
let token = std::env::var(TOKEN_VAR)
.with_context(|_| format!("missing environment variable {}", TOKEN_VAR))?;
Ok(GitHubApi {
http: Client::new(),
token: token.to_string(),
})
}
fn prepare(&self, method: Method, url: &str) -> Result<RequestBuilder, Error> {
let url = if url.starts_with("https://") {
Cow::Borrowed(url)
} else {
Cow::Owned(format!("{}{}", API_BASE, url))
};
Ok(self.http.request(method, url.as_ref()).header(
header::AUTHORIZATION,
HeaderValue::from_str(&format!("token {}", self.token))?,
))
}
fn graphql<R, V>(&self, query: &str, variables: V) -> Result<R, Error>
where
R: for<'de> serde::Deserialize<'de>,
V: serde::Serialize,
{
#[derive(serde::Serialize)]
struct Request<'a, V> {
query: &'a str,
variables: V,
}
let res: GraphResult<R> = self
.prepare(Method::POST, "graphql")?
.json(&Request { query, variables })
.send()?
.error_for_status()?
.json()?;
if let Some(error) = res.errors.iter().next() {
bail!("graphql error: {}", error.message);
} else if let Some(data) = res.data {
Ok(data)
} else {
bail!("missing graphql data");
}
}
pub(crate) fn user(&self, login: &str) -> Result<User, Error> {
Ok(self
.prepare(Method::GET, &format!("users/{}", login))?
.send()?
.error_for_status()?
.json()?)
}
pub(crate) fn usernames(&self, ids: &[usize]) -> Result<HashMap<usize, String>, Error> {
#[derive(serde::Deserialize)]
#[serde(rename_all = "camelCase")]
struct Usernames {
database_id: usize,
login: String,
}
#[derive(serde::Serialize)]
struct Params {
ids: Vec<String>,
}
static QUERY: &str = "
query($ids: [ID!]!) {
nodes(ids: $ids) {
... on User {
databaseId
login
}
}
}
";
let mut result = HashMap::new();
for chunk in ids.chunks(100) {
let res: GraphNodes<Usernames> = self.graphql(
QUERY,
Params {
ids: chunk.iter().map(|id| user_node_id(*id)).collect(),
},
)?;
for node in res.nodes.into_iter().filter_map(|n| n) {
result.insert(node.database_id, node.login);
}
}
Ok(result)
}
}
fn user_node_id(id: usize) -> String {
base64::encode(&format!("04:User{}", id))
}
|
