138 lines
3.9 KiB
V
138 lines
3.9 KiB
V
module docker
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import net.unix
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import io
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import net.http
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import strings
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import net.urllib
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import json
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import util
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const (
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socket = '/var/run/docker.sock'
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buf_len = 10 * 1024
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http_separator = [u8(`\r`), `\n`, `\r`, `\n`]
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http_chunk_separator = [u8(`\r`), `\n`]
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)
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pub struct DockerConn {
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mut:
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socket &unix.StreamConn
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reader &io.BufferedReader
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}
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// new_conn creates a new connection to the Docker daemon.
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pub fn new_conn() ?&DockerConn {
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s := unix.connect_stream(docker.socket)?
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d := &DockerConn{
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socket: s
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reader: io.new_buffered_reader(reader: s)
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}
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return d
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}
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// close closes the underlying socket connection.
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pub fn (mut d DockerConn) close() ? {
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d.socket.close()?
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}
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// send_request sends an HTTP request without body.
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pub fn (mut d DockerConn) send_request(method http.Method, url urllib.URL) ? {
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req := '$method $url.request_uri() HTTP/1.1\nHost: localhost\n\n'
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d.socket.write_string(req)?
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// When starting a new request, the reader needs to be reset.
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d.reader = io.new_buffered_reader(reader: d.socket)
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}
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// send_request_with_body sends an HTTP request with the given body.
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pub fn (mut d DockerConn) send_request_with_body(method http.Method, url urllib.URL, content_type string, body string) ? {
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req := '$method $url.request_uri() HTTP/1.1\nHost: localhost\nContent-Type: $content_type\nContent-Length: $body.len\n\n$body\n\n'
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d.socket.write_string(req)?
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// When starting a new request, the reader needs to be reset.
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d.reader = io.new_buffered_reader(reader: d.socket)
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}
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// send_request_with_json<T> is a convenience wrapper around
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// send_request_with_body that encodes the input as JSON.
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pub fn (mut d DockerConn) send_request_with_json<T>(method http.Method, url urllib.URL, data &T) ? {
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body := json.encode(data)
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return d.send_request_with_body(method, url, 'application/json', body)
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}
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// read_response_head consumes the socket's contents until it encounters
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// '\r\n\r\n', after which it parses the response as an HTTP response.
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// Importantly, this function never consumes the reader past the HTTP
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// separator, so the body can be read fully later on.
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pub fn (mut d DockerConn) read_response_head() ?http.Response {
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mut res := []u8{}
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util.read_until_separator(mut d.reader, mut res, docker.http_separator)?
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return http.parse_response(res.bytestr())
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}
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// read_response_body reads `length` bytes from the stream. It can be used when
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// the response encoding isn't chunked to fully read it.
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pub fn (mut d DockerConn) read_response_body(length int) ?string {
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if length == 0 {
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return ''
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}
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mut buf := []u8{len: docker.buf_len}
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mut c := 0
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mut builder := strings.new_builder(docker.buf_len)
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for builder.len < length {
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c = d.reader.read(mut buf) or { break }
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builder.write(buf[..c])?
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}
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return builder.str()
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}
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// read_response is a convenience function which always consumes the entire
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// response & returns it. It should only be used when we're certain that the
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// result isn't too large.
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pub fn (mut d DockerConn) read_response() ?(http.Response, string) {
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head := d.read_response_head()?
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if head.header.get(http.CommonHeader.transfer_encoding) or { '' } == 'chunked' {
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mut builder := strings.new_builder(1024)
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mut body := d.get_chunked_response_reader()
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util.reader_to_writer(mut body, mut builder)?
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return head, builder.str()
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}
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content_length := head.header.get(http.CommonHeader.content_length)?.int()
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res := d.read_response_body(content_length)?
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return head, res
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}
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// get_chunked_response_reader returns a ChunkedResponseReader using the socket
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// as reader.
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pub fn (mut d DockerConn) get_chunked_response_reader() &ChunkedResponseReader {
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r := new_chunked_response_reader(d.reader)
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return r
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}
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// get_stream_format_reader returns a StreamFormatReader using the socket as
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// reader.
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pub fn (mut d DockerConn) get_stream_format_reader() &StreamFormatReader {
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r := new_chunked_response_reader(d.reader)
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r2 := new_stream_format_reader(r)
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return r2
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}
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