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use serde_json::json;
use std::time::Duration;
use anyhow::{Result, anyhow};
use log::{self,info};
use crate::EntityType;
pub struct SearchResults {
pub entity_type: EntityType,
pub limit: Option<u64>,
pub count: u64,
pub took_ms: u64,
offset: u64,
batch: Vec<serde_json::Value>,
scroll_id: Option<String>,
scroll_url: String,
http_client: reqwest::Client,
}
impl Iterator for SearchResults {
type Item = Result<serde_json::Value>;
fn next(&mut self) -> Option<Result<serde_json::Value>> {
// if we already hit limit, bail early
if let Some(l) = self.limit {
if self.offset >= l {
return None
}
}
// if current batch is empty, and we are scrolling, refill the current batch
if self.batch.is_empty() && self.scroll_id.is_some() {
let response = self.http_client.get(&self.scroll_url)
.header("Content-Type", "application/json")
.body(json!({
"scroll": "2m",
"scroll_id": self.scroll_id.clone().unwrap(),
}).to_string())
.send();
let mut response = match response {
Err(e) => return Some(Err(e.into())),
Ok(v) => v,
};
if !response.status().is_success() {
return Some(Err(anyhow!("search error, status={}", response.status())));
};
let body: serde_json::Value = match response.json() {
Err(e) => return Some(Err(e.into())),
Ok(v) => v,
};
self.scroll_id = Some(body["_scroll_id"].as_str().unwrap().to_string());
self.batch = body["hits"]["hits"].as_array().unwrap().to_vec();
}
// return next hit from the most recent batch
if !self.batch.is_empty() {
self.offset += 1;
let val = self.batch.pop().unwrap();
let source = val["_source"].clone();
return Some(Ok(source));
}
// if batch is empty and couldn't be refilled, terminate
// TODO: should we raise error if ended early?
None
}
}
pub fn crude_search(api_host: &str, entity_type: EntityType, limit: Option<u64>, terms: Vec<String>) -> Result<SearchResults> {
let index = match entity_type {
EntityType::Release => "fatcat_release",
EntityType::File => "fatcat_file",
EntityType::Container => "fatcat_container",
_ => return Err(anyhow!("No search index for entity type: {:?}", entity_type)),
};
let http_client = reqwest::Client::builder()
.timeout(Duration::from_secs(10))
.danger_accept_invalid_certs(true)
.build()
.expect("ERROR :: Could not build reqwest client");
let query: String = if terms.is_empty() {
"*".to_string()
} else {
terms.join(" ")
};
info!("Search query string: {}", query);
let request_url = format!("{}/{}/_search", api_host, index);
let scroll_url = format!("{}/_search/scroll", api_host);
// sort by _doc for (potentially) very large result sets
let (scroll_mode, sort_mode, size) = match limit {
None => (true, "_doc", 100),
Some(l) if l > 100 => (true, "_doc", 100),
Some(l) => (false, "_score", l),
};
let query_body = json!({
"query": {
"boosting": {
"positive": {
"bool": {
"must": {
"query_string": {
"query": query,
"default_operator": "AND",
"analyze_wildcard": true,
"allow_leading_wildcard": false,
"lenient": true,
"fields": [
"title^2",
"biblio",
],
},
},
"should": {
"term": { "in_ia": true },
},
},
},
"negative": {
"bool": {
"should": [
{"bool": { "must_not" : { "exists": { "field": "title" }}}},
{"bool": { "must_not" : { "exists": { "field": "year" }}}},
{"bool": { "must_not" : { "exists": { "field": "type" }}}},
{"bool": { "must_not" : { "exists": { "field": "stage" }}}},
],
},
},
"negative_boost": 0.5,
},
},
"size": size,
"sort": [ sort_mode ],
}).to_string();
let mut request = http_client.get(&request_url)
.header("Content-Type", "application/json")
.body(query_body);
if scroll_mode {
request = request.query(&[("scroll", "2m")]);
}
let mut response = request.send()?;
if !response.status().is_success() {
return Err(anyhow!("search error, status={}", response.status()));
}
//println!("{:?}", response);
let body: serde_json::Value = response.json()?;
let scroll_id = if scroll_mode {
None
} else {
Some(body["_scroll_id"].as_str().unwrap().to_string())
};
Ok(SearchResults {
entity_type,
limit,
count: body["hits"]["total"].as_u64().unwrap(),
took_ms: body["took"].as_u64().unwrap(),
offset: 0,
batch: body["hits"]["hits"].as_array().unwrap().to_vec(),
scroll_id,
scroll_url,
http_client,
})
}
|
