refactor: move docker code to external vdocker module
parent
39eb03077e
commit
d060366dcb
GPG Key ID:
B75D4F293C7052DB
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@ -1,6 +1,6 @@
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module build
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import docker
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import vieter.vdocker as docker
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import encoding.base64
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import time
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import os
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@ -1,7 +1,7 @@
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module targets
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import client
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import docker
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import vieter.vdocker as docker
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import os
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import build
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@ -6,7 +6,7 @@ import datatypes { MinHeap }
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import cron.expression { CronExpression, parse_expression }
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import math
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import build
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import docker
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import vieter.vdocker as docker
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import os
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import client
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import models { Target }
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@ -1,3 +0,0 @@
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This module implements part of the Docker Engine API v1.41
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([documentation](https://docs.docker.com/engine/api/v1.41/)) using socket-based
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HTTP communication.
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@ -1,123 +0,0 @@
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module docker
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import json
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import net.urllib
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import time
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import net.http { Method }
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struct DockerError {
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message string
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}
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pub struct NewContainer {
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image string [json: Image]
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entrypoint []string [json: Entrypoint]
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cmd []string [json: Cmd]
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env []string [json: Env]
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work_dir string [json: WorkingDir]
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user string [json: User]
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}
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struct CreatedContainer {
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pub:
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id string [json: Id]
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warnings []string [json: Warnings]
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}
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// create_container creates a new container with the given config.
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pub fn (mut d DockerConn) create_container(c NewContainer) ?CreatedContainer {
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d.send_request_with_json(Method.post, urllib.parse('/v1.41/containers/create')?, c)?
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head, res := d.read_response()?
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if head.status_code != 201 {
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data := json.decode(DockerError, res)?
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return error(data.message)
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}
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data := json.decode(CreatedContainer, res)?
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return data
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}
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// start_container starts the container with the given id.
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pub fn (mut d DockerConn) start_container(id string) ? {
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d.send_request(Method.post, urllib.parse('/v1.41/containers/$id/start')?)?
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head, body := d.read_response()?
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if head.status_code != 204 {
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data := json.decode(DockerError, body)?
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return error(data.message)
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}
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}
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struct ContainerInspect {
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pub mut:
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state ContainerState [json: State]
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}
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struct ContainerState {
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pub:
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running bool [json: Running]
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status string [json: Status]
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exit_code int [json: ExitCode]
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// These use a rather specific format so they have to be parsed later
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start_time_str string [json: StartedAt]
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end_time_str string [json: FinishedAt]
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pub mut:
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start_time time.Time [skip]
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end_time time.Time [skip]
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}
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// inspect_container returns detailed information for a given container.
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pub fn (mut d DockerConn) inspect_container(id string) ?ContainerInspect {
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d.send_request(Method.get, urllib.parse('/v1.41/containers/$id/json')?)?
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head, body := d.read_response()?
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if head.status_code != 200 {
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data := json.decode(DockerError, body)?
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return error(data.message)
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}
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mut data := json.decode(ContainerInspect, body)?
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// The Docker engine API *should* always return UTC time.
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data.state.start_time = time.parse_rfc3339(data.state.start_time_str)?
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if data.state.status == 'exited' {
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data.state.end_time = time.parse_rfc3339(data.state.end_time_str)?
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}
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return data
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}
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// remove_container removes the container with the given id.
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pub fn (mut d DockerConn) remove_container(id string) ? {
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d.send_request(Method.delete, urllib.parse('/v1.41/containers/$id')?)?
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head, body := d.read_response()?
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if head.status_code != 204 {
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data := json.decode(DockerError, body)?
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return error(data.message)
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}
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}
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// get_container_logs returns a reader object allowing access to the
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// container's logs.
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pub fn (mut d DockerConn) get_container_logs(id string) ?&StreamFormatReader {
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d.send_request(Method.get, urllib.parse('/v1.41/containers/$id/logs?stdout=true&stderr=true')?)?
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head := d.read_response_head()?
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if head.status_code != 200 {
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content_length := head.header.get(http.CommonHeader.content_length)?.int()
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body := d.read_response_body(content_length)?
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data := json.decode(DockerError, body)?
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return error(data.message)
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}
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return d.get_stream_format_reader()
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}
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@ -1,137 +0,0 @@
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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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@ -1,61 +0,0 @@
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module docker
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import net.http { Method }
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import net.urllib
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import json
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struct Image {
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pub:
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id string [json: Id]
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}
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// pull_image pulls the given image:tag.
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pub fn (mut d DockerConn) pull_image(image string, tag string) ? {
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d.send_request(Method.post, urllib.parse('/v1.41/images/create?fromImage=$image&tag=$tag')?)?
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head := d.read_response_head()?
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if head.status_code != 200 {
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content_length := head.header.get(http.CommonHeader.content_length)?.int()
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body := d.read_response_body(content_length)?
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data := json.decode(DockerError, body)?
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return error(data.message)
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}
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// Keep reading the body until the pull has completed
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mut body := d.get_chunked_response_reader()
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mut buf := []u8{len: 1024}
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for {
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body.read(mut buf) or { break }
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}
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}
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// create_image_from_container creates a new image from a container.
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pub fn (mut d DockerConn) create_image_from_container(id string, repo string, tag string) ?Image {
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d.send_request(Method.post, urllib.parse('/v1.41/commit?container=$id&repo=$repo&tag=$tag')?)?
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head, body := d.read_response()?
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if head.status_code != 201 {
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data := json.decode(DockerError, body)?
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return error(data.message)
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}
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data := json.decode(Image, body)?
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return data
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}
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// remove_image removes the image with the given id.
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pub fn (mut d DockerConn) remove_image(id string) ? {
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d.send_request(Method.delete, urllib.parse('/v1.41/images/$id')?)?
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head, body := d.read_response()?
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if head.status_code != 200 {
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data := json.decode(DockerError, body)?
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return error(data.message)
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}
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}
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@ -1,135 +0,0 @@
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module docker
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import io
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import util
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import encoding.binary
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import encoding.hex
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// ChunkedResponseReader parses an underlying HTTP chunked response, exposing
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// it as if it was a continuous stream of data.
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struct ChunkedResponseReader {
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mut:
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reader io.BufferedReader
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bytes_left_in_chunk u64
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started bool
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}
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// new_chunked_response_reader creates a new ChunkedResponseReader on the heap
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// with the provided reader.
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pub fn new_chunked_response_reader(reader io.BufferedReader) &ChunkedResponseReader {
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r := &ChunkedResponseReader{
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reader: reader
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}
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return r
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}
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// read satisfies the io.Reader interface.
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pub fn (mut r ChunkedResponseReader) read(mut buf []u8) ?int {
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if r.bytes_left_in_chunk == 0 {
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// An io.BufferedReader always returns none if its stream has
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// ended.
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r.bytes_left_in_chunk = r.read_chunk_size()?
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}
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mut c := 0
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// Make sure we don't read more than we can safely read. This is to avoid
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// the underlying reader from becoming out of sync with our parsing:
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if buf.len > r.bytes_left_in_chunk {
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c = r.reader.read(mut buf[..r.bytes_left_in_chunk])?
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} else {
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c = r.reader.read(mut buf)?
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}
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r.bytes_left_in_chunk -= u64(c)
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return c
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}
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// read_chunk_size advances the reader & reads the size of the next HTTP chunk.
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// This function should only be called if the previous chunk has been
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// completely consumed.
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fn (mut r ChunkedResponseReader) read_chunk_size() ?u64 {
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if r.started {
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mut buf := []u8{len: 2}
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// Each chunk ends with a `\r\n` which we want to skip first
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r.reader.read(mut buf)?
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}
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r.started = true
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mut res := []u8{}
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util.read_until_separator(mut r.reader, mut res, http_chunk_separator)?
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// The length of the next chunk is provided as a hexadecimal
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mut num_data := hex.decode(res#[..-2].bytestr())?
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for num_data.len < 8 {
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num_data.insert(0, 0)
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}
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num := binary.big_endian_u64(num_data)
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// This only occurs for the very last chunk, which always reports a size of
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// 0.
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if num == 0 {
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return none
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}
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return num
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}
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// StreamFormatReader parses an underlying stream of Docker logs, removing the
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// header bytes.
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struct StreamFormatReader {
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mut:
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reader ChunkedResponseReader
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bytes_left_in_chunk u32
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}
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// new_stream_format_reader creates a new StreamFormatReader using the given
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// reader.
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pub fn new_stream_format_reader(reader ChunkedResponseReader) &StreamFormatReader {
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r := &StreamFormatReader{
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reader: reader
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}
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return r
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}
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// read satisfies the io.Reader interface.
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pub fn (mut r StreamFormatReader) read(mut buf []u8) ?int {
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if r.bytes_left_in_chunk == 0 {
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r.bytes_left_in_chunk = r.read_chunk_size()?
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}
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mut c := 0
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if buf.len > r.bytes_left_in_chunk {
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c = r.reader.read(mut buf[..r.bytes_left_in_chunk])?
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} else {
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c = r.reader.read(mut buf)?
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}
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r.bytes_left_in_chunk -= u32(c)
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return c
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}
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// read_chunk_size advances the reader & reads the header bytes for the length
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// of the next chunk.
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fn (mut r StreamFormatReader) read_chunk_size() ?u32 {
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mut buf := []u8{len: 8}
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r.reader.read(mut buf)?
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num := binary.big_endian_u32(buf[4..])
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if num == 0 {
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return none
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}
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return num
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}
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