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package Async::Microservice; |
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1815
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use strict; |
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70
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use warnings; |
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use 5.010; |
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use utf8; |
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our $VERSION = '0.02'; |
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10
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1170
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use Moose::Role; |
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11552
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requires qw(get_routes service_name); |
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14332
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use Plack::Request; |
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77222
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2
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use Try::Tiny; |
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use Path::Class qw(dir file); |
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1355
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use MooseX::Types::Path::Class; |
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232400
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3620
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use Path::Router; |
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429397
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109
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use FindBin qw($Bin); |
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279
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1336
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use Async::MicroserviceReq; |
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3053
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21
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has 'api_version' => ( |
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is => 'ro', |
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isa => 'Int', |
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default => 1, |
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); |
26
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has 'static_dir' => ( |
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is => 'ro', |
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isa => 'Path::Class::Dir', |
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required => 1, |
30
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coerce => 1, |
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default => sub { |
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my $static_dir = $ENV{STATIC_DIR} // dir($Bin, '..', 'root', 'static'); |
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die 'static dir "' . $static_dir . '" not found (check $ENV{STATIC_DIR})' |
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if !$static_dir || !-d $static_dir; |
35
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return $static_dir; |
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}, |
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lazy => 1, |
38
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); |
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40
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has 'router' => ( |
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is => 'ro', |
42
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isa => 'Path::Router', |
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lazy => 1, |
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builder => '_build_router' |
45
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); |
46
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47
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our $start_time = time(); |
48
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our $req_count = 0; |
49
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50
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sub _build_router { |
51
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0
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0
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my ($self) = @_; |
52
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53
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0
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my $router = Path::Router->new; |
54
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0
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my @routes = $self->get_routes(); |
55
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0
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while (@routes) { |
56
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0
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my ($path, $opts) = splice(@routes, 0, 2); |
57
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0
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$router->add_route($path, %$opts); |
58
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} |
59
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60
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0
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return $router; |
61
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} |
62
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63
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sub plack_handler { |
64
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0
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0
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0
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my ($self, $env) = @_; |
65
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66
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0
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$req_count++; |
67
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68
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0
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my $plack_req = Plack::Request->new($env); |
69
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0
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my $this_req = Async::MicroserviceReq->new( |
70
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method => $plack_req->method, |
71
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headers => $plack_req->headers, |
72
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content => $plack_req->content, |
73
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path => $plack_req->path_info, |
74
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params => $plack_req->parameters, |
75
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static_dir => $self->static_dir, |
76
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); |
77
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78
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# set process name and last requested path for debug/troubleshooting |
79
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0
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$0 = $self->service_name . ' ' . $this_req->path; |
80
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81
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my $plack_handler_sub = sub { |
82
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0
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0
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my ($plack_respond) = @_; |
83
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0
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$this_req->plack_respond($plack_respond); |
84
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85
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# API version |
86
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0
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my ($version, $sub_path_info); |
87
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0
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0
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if ($this_req->path =~ qr{^/v(\d+?)(/.*)$}) { |
88
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0
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$version = $1; |
89
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0
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$sub_path_info = $2; |
90
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} |
91
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92
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# without version path redirect to the latest version |
93
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0
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0
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return $this_req->redirect('/v' . $self->api_version . '/') |
94
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unless $version; |
95
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96
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# handle static/ |
97
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0
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0
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return $this_req->static($1) |
98
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if ($sub_path_info =~ qr{^/static(/.+)$}); |
99
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100
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# dispatch request |
101
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state $path_dispatch = { |
102
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'/' => sub { |
103
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0
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$this_req->static('index.html', sub {$self->_update_openapi_html(@_)}); |
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0
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104
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}, |
105
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'/edit' => sub { |
106
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0
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$this_req->static('edit.html', sub {$self->_update_openapi_html(@_)}); |
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0
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107
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}, |
108
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'/hcheck' => sub { |
109
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0
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$this_req->text_plain( |
110
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'Service-Name: ' . $self->service_name, |
111
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"API-Version: " . $self->api_version, |
112
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'Uptime: ' . (time() - $start_time), |
113
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'Request-Count: ' . $req_count, |
114
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'Pending-Requests: ' . Async::MicroserviceReq->get_pending_req, |
115
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); |
116
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}, |
117
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'' => sub { |
118
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0
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0
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if (my $match = $self->router->match($sub_path_info)) { |
119
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0
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my $func = $match->{mapping}->{$this_req->method}; |
120
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0
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0
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0
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|
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if ($func && (my $misc_fn = $self->can($func))) { |
121
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0
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%{$this_req->params} = ( |
122
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0
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%{$this_req->params}, |
123
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0
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%{$match->{mapping}} |
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0
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124
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); |
125
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0
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my $resp = $misc_fn->($self, $this_req, $match); |
126
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0
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0
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0
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if (blessed($resp) && $resp->isa('Future')) { |
|
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0
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127
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0
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$resp->retain; |
128
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$resp->on_done( |
129
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sub { |
130
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0
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my ($resp_data) = @_; |
131
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0
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0
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|
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if ( ref($resp_data) eq 'ARRAY' ) { |
132
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0
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$this_req->respond(@$resp_data); |
133
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} |
134
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else { |
135
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0
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$this_req->respond( 200, |
136
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[], $resp_data ); |
137
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} |
138
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} |
139
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0
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); |
140
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$resp->on_fail(sub { |
141
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0
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my ($err_msg) = @_; |
142
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0
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0
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$err_msg ||= 'unknown'; |
143
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0
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$this_req->respond( |
144
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503, [], 'internal server error calling '.$func.': ' . $err_msg |
145
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); |
146
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0
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}); |
147
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$resp->on_cancel(sub { |
148
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0
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$this_req->respond( |
149
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429, [], 'request for '.$func.' canceled' |
150
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); |
151
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0
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}); |
152
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} |
153
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elsif (ref($resp) eq 'ARRAY') { |
154
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0
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|
|
$this_req->respond(@$resp); |
155
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} |
156
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0
|
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|
|
return; |
157
|
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} |
158
|
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} |
159
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0
|
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|
return $this_req->respond(404, [], 'not found'); |
160
|
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}, |
161
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0
|
|
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|
|
}; |
162
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0
|
|
0
|
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|
|
my $dispatch_fn = $path_dispatch->{$sub_path_info} // $path_dispatch->{''}; |
163
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164
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0
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return $dispatch_fn->(); |
165
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0
|
|
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|
}; |
166
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167
|
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return sub { |
168
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0
|
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0
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|
|
my $respond = shift; |
169
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my $response = try { |
170
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0
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$plack_handler_sub->($respond); |
171
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} |
172
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catch { |
173
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0
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$this_req->respond(503, [], 'internal server error: ' . $_); |
174
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0
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|
|
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|
|
}; |
175
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0
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return $response; |
176
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0
|
|
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|
|
|
}; |
177
|
|
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|
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|
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} |
178
|
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179
|
|
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sub _update_openapi_html { |
180
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0
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|
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0
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|
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my ($self, $content) = @_; |
181
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0
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my $service_name = $self->service_name; |
182
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0
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$content =~ s/ASYNC-SERVICE-NAME/$service_name/g; |
183
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0
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return $content; |
184
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|
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|
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} |
185
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186
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1; |
187
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188
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|
|
__END__ |
189
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190
|
|
|
|
|
|
|
=head1 NAME |
191
|
|
|
|
|
|
|
|
192
|
|
|
|
|
|
|
Async::Microservice - Async HTTP Microservice Moose Role |
193
|
|
|
|
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|
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|
194
|
|
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|
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|
|
=head1 SYNOPSYS |
195
|
|
|
|
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|
|
196
|
|
|
|
|
|
|
# lib/Async/Microservice/HelloWorld.pm |
197
|
|
|
|
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|
|
package Async::Microservice::HelloWorld; |
198
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|
|
|
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|
|
use Moose; |
199
|
|
|
|
|
|
|
with qw(Async::Microservice); |
200
|
|
|
|
|
|
|
sub service_name {return 'asmi-helloworld';} |
201
|
|
|
|
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|
|
sub get_routes {return ('hello' => {defaults => {GET => 'GET_hello'}});} |
202
|
|
|
|
|
|
|
sub GET_hello { |
203
|
|
|
|
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|
|
my ( $self, $this_req ) = @_; |
204
|
|
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|
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|
|
return [ 200, [], 'Hello world!' ]; |
205
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|
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|
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|
|
} |
206
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|
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|
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1; |
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# bin/async-microservice-helloworld.psgi |
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use Async::Microservice::HelloWorld; |
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my $mise = Async::Microservice::HelloWorld->new(); |
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return sub { $mise->plack_handler(@_) }; |
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$ plackup -Ilib --port 8089 --server Twiggy bin/async-microservice-helloworld.psgi |
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$ curl http://localhost:8089/v1/hello |
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Hello world! |
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=head1 DESCRIPTION |
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This L<Moose::Role> helps to quicly bootstrap async http service that is |
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including OpenAPI documentation. |
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See L<https://time.meon.eu/> and L<Async::Microservice::Time> code. |
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=head2 To bootstrap new async service |
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Create new package for your APIs from current examples |
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C<lib/Async/Microservice/*>. Inside set return value of C<service_name>. |
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This string will be used to set process name and to read/locate |
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OpenAPI yaml definition for the documentation. Any GET/POST processing |
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funtions must be defined in C<get_routes> funtion. |
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Copy one of the C<bin/*.psgi> update it with your new package name. |
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Copy one of the C<root/static/*.yaml> to have the same name as |
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C<service_name>. |
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Now you are able to lauch the http service with: |
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plackup -Ilib --port 8089 --server Twiggy bin/async-microservice-YOUNAME.psgi |
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In your broser you can read the OpenAPI documentation: L<http://0.0.0.0:8089/v1/> |
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and also use editor to extend it: L<http://0.0.0.0:8089/v1/edit> |
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=head1 SEE ALSO |
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OpenAPI Specification: L<https://github.com/OAI/OpenAPI-Specification/tree/master/versions> |
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or L<https://swagger.io/docs/specification/about/> |
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L<Async::MicroserviceReq> |
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L<Twiggy> |
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=head1 TODO |
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- graceful termination (finish all requests before terminating on sigterm/hup) |
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- systemd service file examples |
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- static/index.html and static/edit.html are not really static, should be moved |
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=head1 CONTRIBUTORS & CREDITS |
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The following people have contributed to this distribution by committing their |
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code, sending patches, reporting bugs, asking questions, suggesting useful |
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advice, nitpicking, chatting on IRC or commenting on my blog (in no particular |
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order): |
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you? |
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Also thanks to my current day-job-employer L<https://www.apa-it.at/>. |
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=head1 BUGS |
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Please report any bugs or feature requests via L<https://github.com/jozef/Async-Microservice/issues>. |
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=head1 AUTHOR |
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Jozef Kutej |
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=head1 COPYRIGHT & LICENSE |
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Copyright 2020 Jozef Kutej, all rights reserved. |
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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=cut |