{{ message }}
-
-
Notifications
You must be signed in to change notification settings - Fork 11
Expand file tree
/
Copy pathNpgsqlRestSseEventSource.cs
More file actions
203 lines (188 loc) · 9.07 KB
/
Copy pathNpgsqlRestSseEventSource.cs
File metadata and controls
203 lines (188 loc) · 9.07 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
using Npgsql;
using NpgsqlRest.Defaults;
namespace NpgsqlRest;
public readonly record struct SseEvent(
PostgresNotice Notice,
RoutineEndpoint? Endpoint,
string? ExecutionId);
public class NpgsqlRestSseEventSource(RequestDelegate next)
{
public static readonly HashSet<string> Paths = [];
public static readonly Broadcaster<SseEvent> Broadcaster = new();
/// <summary>
/// True if any endpoint in the build participates in SSE — either as a publisher (<c>@sse</c> /
/// <c>@sse_publish</c>) or as a subscribe URL (<c>@sse</c> / <c>@sse_subscribe</c>). Used as a fast
/// guard for the unbound-RAISE warning so projects that don't use SSE at all pay zero per-notice
/// cost. Once any endpoint registers SSE usage, every other endpoint's notices are eligible to
/// trigger the warning when their <c>RAISE</c> level matches the configured forwarding level.
/// </summary>
public static bool HasAnySseEndpoints { get; internal set; } = false;
public async Task InvokeAsync(HttpContext context)
{
if (Paths.Contains(context.Request.Path) is false)
{
await next(context);
return;
}
var executionId = context.Request.QueryString.HasValue ? context.Request.QueryString.Value[1..] : null;
var cancellationToken = context.RequestAborted;
context.Response.Headers.ContentType = "text/event-stream";
context.Response.Headers.CacheControl = "no-cache, no-store, must-revalidate, max-age=0";
context.Response.Headers.Connection = "keep-alive";
if (Options.SseResponseHeaders.Count > 0)
{
foreach (var header in Options.SseResponseHeaders)
{
if (context.Response.Headers.ContainsKey(header.Key))
{
context.Response.Headers[header.Key] = header.Value;
}
else
{
context.Response.Headers.Append(header.Key, header.Value);
}
}
}
var connectionId = Guid.NewGuid();
var reader = Broadcaster.Subscribe(connectionId);
// Force the response headers + an initial body byte to flush immediately. SSE permits
// comment-only lines (lines starting with ':'); browsers and EventSource clients ignore
// them. Without an early flush, the GET stays "headers pending" until the first real event
// — which prevents callers (notably integration tests) from sequencing "subscribe THEN
// publish": their GET wouldn't return until an event had already been received, and the
// server's await-foreach below blocks waiting for that same event. Writing a small comment
// breaks the deadlock and acts as a connection-established ping.
try
{
await context.Response.WriteAsync(": connected\n\n", cancellationToken);
await context.Response.Body.FlushAsync(cancellationToken);
}
catch (OperationCanceledException)
{
Broadcaster.Unsubscribe(connectionId);
return;
}
try
{
await foreach (var noticeEvent in reader.ReadAllAsync(cancellationToken))
{
var endpoint = noticeEvent.Endpoint;
var scope = noticeEvent.Endpoint?.SseEventsScope;
var infoEventsRoles = endpoint?.SseEventsRoles;
if (string.IsNullOrEmpty(executionId) is false && string.IsNullOrEmpty(noticeEvent.ExecutionId) is false)
{
if (string.Equals(executionId, noticeEvent.ExecutionId, StringComparison.Ordinal) is false)
{
continue; // Skip events not matching the current execution ID
}
}
if (string.IsNullOrEmpty(noticeEvent.Notice.Hint) is false)
{
string hint = noticeEvent.Notice.Hint;
var words = hint.SplitWords();
if (words is not null && words.Length > 0 && Enum.TryParse<SseEventsScope>(words[0], true, out var parsedScope))
{
scope = parsedScope;
if (scope == SseEventsScope.Authorize && words.Length > 1)
{
// if info roles already exist, merge them with the new ones
infoEventsRoles ??= new HashSet<string>(StringComparer.OrdinalIgnoreCase);
foreach (var word in words[1..])
{
if (infoEventsRoles.Contains(word) is false && string.IsNullOrWhiteSpace(word) is false)
{
infoEventsRoles.Add(word);
}
}
}
}
else
{
Logger?.LogError("Could not recognize valid value for parameter key {key}. Valid values are: {values}. Provided value is {provided}.",
words?[0], string.Join(", ", Enum.GetNames<SseEventsScope>()), hint);
}
}
else if (scope == SseEventsScope.Matching)
{
if (context.User?.Identity?.IsAuthenticated is false &&
(endpoint?.RequiresAuthorization is true || endpoint?.AuthorizeRoles is not null))
{
continue; // Skip events for unauthorized users
}
if (endpoint?.AuthorizeRoles is not null)
{
bool ok = false;
foreach (var claim in context.User?.Claims ?? [])
{
if (
string.Equals(claim.Type, Options.AuthenticationOptions.DefaultUserIdClaimType, StringComparison.Ordinal) ||
string.Equals(claim.Type, Options.AuthenticationOptions.DefaultNameClaimType, StringComparison.Ordinal) ||
string.Equals(claim.Type, Options.AuthenticationOptions.DefaultRoleClaimType, StringComparison.Ordinal))
{
if (endpoint?.AuthorizeRoles.Contains(claim.Value) is true)
{
ok = true;
break;
}
}
}
if (ok is false)
{
continue;
}
}
}
else if (scope == SseEventsScope.Authorize)
{
if (context.User?.Identity?.IsAuthenticated is false)
{
continue; // Skip events for unauthorized users
}
if (infoEventsRoles is not null)
{
bool ok = false;
if (context.User?.Claims is not null)
{
foreach (var claim in context.User?.Claims!)
{
if (
string.Equals(claim.Type, Options.AuthenticationOptions.DefaultUserIdClaimType, StringComparison.Ordinal) ||
string.Equals(claim.Type, Options.AuthenticationOptions.DefaultNameClaimType, StringComparison.Ordinal) ||
string.Equals(claim.Type, Options.AuthenticationOptions.DefaultRoleClaimType, StringComparison.Ordinal)
)
{
if (infoEventsRoles.Contains(claim.Value) is true)
{
ok = true;
break;
}
}
}
}
if (ok is false)
{
continue;
}
}
}
try
{
await context.Response.WriteAsync($"data: {noticeEvent.Notice.MessageText}\n\n", cancellationToken);
await context.Response.Body.FlushAsync(cancellationToken);
}
catch (OperationCanceledException)
{
break;
}
catch (Exception ex)
{
Logger?.LogError(ex, "Failed to write notice event to response at path {path} (ExecutionId={executionId})", context.Request.Path, executionId);
}
}
}
finally
{
Broadcaster.Unsubscribe(connectionId);
}
}
}
You can’t perform that action at this time.