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hare-http/net/http/do.ha

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use bufio;
use encoding::utf8;
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use errors;
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use fmt;
use io;
use net::dial;
use net::uri;
use net;
use os;
use strconv;
use strings;
use types;
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// Performs an HTTP [[request]] with the given [[client]]. The request is
// performed synchronously; this function blocks until the server has returned
// the response status and all HTTP headers associated with the response.
export fn do(client: *client, req: *request) (response | error) = {
assert(req.target.scheme == "http"); // TODO: https
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const conn = dial::dial_uri("tcp", req.target)?;
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let buf: [os::BUFSIZ]u8 = [0...];
let file = bufio::buffered(conn, [], buf);
bufio::setflush(&file, []);
fmt::fprintf(&file, "{} ", req.method)?;
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// TODO: Support other request-targets than origin-form
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const target = uri_origin_form(req.target);
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uri::fmt(&file, &target)?;
fmt::fprintf(&file, " HTTP/1.1\r\n")?;
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write_header(&file, &req.header)?;
fmt::fprintf(&file, "\r\n")?;
bufio::flush(&file)?;
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const trans = match (req.transport) {
case let t: *transport =>
yield t;
case =>
yield &client.default_transport;
};
// TODO: Implement None
assert(trans.request_transport == transport_mode::AUTO);
assert(trans.response_transport == transport_mode::AUTO);
assert(trans.request_content == content_mode::AUTO);
assert(trans.response_content == content_mode::AUTO);
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match (req.body) {
case let body: io::handle =>
io::copy(conn, body)?;
case void =>
yield;
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};
let resp = response { ... };
const scan = bufio::newscanner_static(conn, buf);
read_statusline(&resp, &scan)?;
read_header(&resp.header, &scan)?;
resp.body = new_reader(conn, &resp, &scan)?;
return resp;
};
fn read_statusline(
resp: *response,
scan: *bufio::scanner,
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) (void | error) = {
const status = match (bufio::scan_string(scan, "\r\n")) {
case let line: const str =>
yield line;
case let err: io::error =>
return err;
case utf8::invalid =>
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return protoerr;
case io::EOF =>
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return protoerr;
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};
const tok = strings::tokenize(status, " ");
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const version = match (strings::next_token(&tok)) {
case let ver: str =>
yield ver;
case void =>
return protoerr;
};
const status = match (strings::next_token(&tok)) {
case let status: str =>
yield status;
case void =>
return protoerr;
};
const reason = match (strings::next_token(&tok)) {
case let reason: str =>
yield reason;
case void =>
return protoerr;
};
const (_, version) = strings::cut(version, "/");
const (major, minor) = strings::cut(version, ".");
resp.version = (
strconv::stou(major)!,
strconv::stou(minor)!,
);
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if (resp.version.0 > 1) {
return errors::unsupported;
};
resp.status = strconv::stou(status)!;
resp.reason = strings::dup(reason);
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};