| 1 |
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-module(chrme_launcher). |
| 2 |
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-behaviour(gen_server). |
| 3 |
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|
| 4 |
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-export([start/1, start_link/1, await_start/1, stop/1]). |
| 5 |
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]). |
| 6 |
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-export_type([ |
| 7 |
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options/0 |
| 8 |
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, state/0 |
| 9 |
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, name/0 |
| 10 |
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]). |
| 11 |
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|
| 12 |
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-type name() :: term(). |
| 13 |
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| 14 |
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-type options() :: #{ |
| 15 |
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name := name() |
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, executable => klsn:binstr() |
| 17 |
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, remote_port => 0..65535 |
| 18 |
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, user_data_dir => klsn:binstr() |
| 19 |
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, extra_args => [klsn:binstr()] |
| 20 |
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, headless => boolean() |
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}. |
| 22 |
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|
| 23 |
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-type state() :: #{ |
| 24 |
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port := port() |
| 25 |
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, opts := options() |
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}. |
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|
| 28 |
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-spec start(options()) -> {ok, pid()} | {error, term()}. |
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start(Options) -> |
| 30 |
:-( |
Name = maps:get(name, Options), |
| 31 |
:-( |
gen_server:start({global, Name}, ?MODULE, Options, []). |
| 32 |
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|
| 33 |
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-spec start_link(options()) -> {ok, pid()} | {error, term()}. |
| 34 |
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start_link(Options) -> |
| 35 |
4 |
Name = maps:get(name, Options), |
| 36 |
4 |
gen_server:start_link({global, Name}, ?MODULE, Options, []). |
| 37 |
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|
| 38 |
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-spec await_start(name()) -> ok. |
| 39 |
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await_start(Name) -> |
| 40 |
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% This also makes sure server exists. |
| 41 |
17 |
Options = gen_server:call({global, Name}, get_options), |
| 42 |
17 |
Host = <<"localhost">>, |
| 43 |
17 |
Port = maps:get(remote_port, Options), |
| 44 |
17 |
case chrme_http_apic:version(Host, Port) of |
| 45 |
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{ok, _} -> |
| 46 |
4 |
ok; |
| 47 |
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_Error -> |
| 48 |
13 |
timer:sleep(100), |
| 49 |
13 |
await_start(Name) |
| 50 |
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end. |
| 51 |
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|
| 52 |
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-spec stop(name()) -> ok. |
| 53 |
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stop(Name) -> |
| 54 |
4 |
gen_server:stop({global, Name}). |
| 55 |
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|
| 56 |
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-spec init(options()) -> {ok, state()}. |
| 57 |
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init(Options0) -> |
| 58 |
4 |
Options = normalize_options(Options0), |
| 59 |
4 |
PathBin = maps:get(executable, Options), |
| 60 |
4 |
Path = binary_to_list(PathBin), |
| 61 |
4 |
RemotePort = maps:get(remote_port, Options), |
| 62 |
4 |
RemotePortStr = integer_to_list(RemotePort), |
| 63 |
4 |
DataDirBin = maps:get(user_data_dir, Options), |
| 64 |
4 |
DataDir = binary_to_list(DataDirBin), |
| 65 |
4 |
Headless = maps:get(headless, Options), |
| 66 |
4 |
ExtraArgsBin = maps:get(extra_args, Options), |
| 67 |
4 |
ExtraArgs = [binary_to_list(B) || B <- ExtraArgsBin], |
| 68 |
4 |
BaseArgs = [ |
| 69 |
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"--remote-debugging-port=" ++ RemotePortStr, |
| 70 |
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"--user-data-dir=" ++ DataDir |
| 71 |
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], |
| 72 |
4 |
HeadlessArgs = case Headless of |
| 73 |
4 |
true -> ["--headless"]; |
| 74 |
:-( |
false -> [] |
| 75 |
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end, |
| 76 |
4 |
CmdArgs = BaseArgs ++ HeadlessArgs ++ ExtraArgs, |
| 77 |
4 |
process_flag(trap_exit, true), |
| 78 |
4 |
Port = open_port({spawn_executable, Path}, [ |
| 79 |
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binary, |
| 80 |
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exit_status, |
| 81 |
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use_stdio, |
| 82 |
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stderr_to_stdout, |
| 83 |
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{args, CmdArgs} |
| 84 |
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]), |
| 85 |
4 |
{ok, #{port => Port, opts => Options}}. |
| 86 |
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|
| 87 |
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% Internal: merge user options with defaults |
| 88 |
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-spec normalize_options(map()) -> options(). |
| 89 |
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normalize_options(Options) -> |
| 90 |
4 |
#{ |
| 91 |
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name => maps:get(name, Options) |
| 92 |
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, executable => maps:get(executable, Options, <<"/usr/bin/google-chrome">>) |
| 93 |
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, remote_port => maps:get(remote_port, Options, 9222) |
| 94 |
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, user_data_dir => maps:get(user_data_dir, Options, <<"/tmp/chrme_default_user_data_dir">>) |
| 95 |
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, extra_args => maps:get(extra_args, Options, []) |
| 96 |
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, headless => maps:get(headless, Options, true) |
| 97 |
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}. |
| 98 |
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|
| 99 |
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handle_call(get_options, _From, State) -> |
| 100 |
17 |
{reply, maps:get(opts, State), State}. |
| 101 |
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| 102 |
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handle_cast(_Msg, State) -> |
| 103 |
:-( |
{noreply, State}. |
| 104 |
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| 105 |
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handle_info({Port, {data, _Data}}, State = #{port := Port}) -> |
| 106 |
54 |
{noreply, State}; |
| 107 |
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handle_info({Port, {exit_status, Status}}, State = #{port := Port}) -> |
| 108 |
:-( |
{stop, {chrome_exit, Status}, State}; |
| 109 |
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handle_info({'EXIT', Port, Reason}, State = #{port := Port}) -> |
| 110 |
:-( |
{stop, {port_exit, Reason}, State}; |
| 111 |
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handle_info(_Info, State) -> |
| 112 |
:-( |
{noreply, State}. |
| 113 |
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|
| 114 |
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terminate(_Reason, #{port := Port}) -> |
| 115 |
4 |
catch port_close(Port), |
| 116 |
4 |
ok. |