Do not assume server time is in sync with local machine time on rate …

…limit path (#1972)

Co-authored-by: Liam Newman <bitwiseman@gmail.com>

src/main/java/org/kohsuke/github/GitHubRateLimitHandler.java

@@ -5,6 +5,9 @@
 
 import java.io.IOException;
 import java.io.InterruptedIOException;
+import java.time.Duration;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
 
 import javax.annotation.Nonnull;
 
@@ -21,6 +24,11 @@
  */
 public abstract class GitHubRateLimitHandler extends GitHubConnectorResponseErrorHandler {
 
+    /**
+     * On a wait, even if the response suggests a very short wait, wait for a minimum duration.
+     */
+    private static final int MINIMUM_RATE_LIMIT_RETRY_MILLIS = 1000;
+
     /**
      * Create default GitHubRateLimitHandler instance
      */
@@ -71,15 +79,29 @@ public void onError(GitHubConnectorResponse connectorResponse) throws IOExceptio
                 throw (InterruptedIOException) new InterruptedIOException().initCause(ex);
             }
         }
+    };
 
-        private long parseWaitTime(GitHubConnectorResponse connectorResponse) {
-            String v = connectorResponse.header("X-RateLimit-Reset");
-            if (v == null)
-                return 60 * 1000; // can't tell, return 1 min
+    /*
+     * Exposed for testability. Given an http response, find the rate limit reset header field and parse it. If no
+     * header is found, wait for a reasonably amount of time.
+     */
+    long parseWaitTime(GitHubConnectorResponse connectorResponse) {
+        String v = connectorResponse.header("X-RateLimit-Reset");
+        if (v == null)
+            return Duration.ofMinutes(1).toMillis(); // can't tell, return 1 min
 
-            return Math.max(1000, Long.parseLong(v) * 1000 - System.currentTimeMillis());
+        // Don't use ZonedDateTime.now(), because the local and remote server times may not be in sync
+        // Instead, we can take advantage of the Date field in the response to see what time the remote server
+        // thinks it is
+        String dateField = connectorResponse.header("Date");
+        ZonedDateTime now;
+        if (dateField != null) {
+            now = ZonedDateTime.parse(dateField, DateTimeFormatter.RFC_1123_DATE_TIME);
+        } else {
+            now = ZonedDateTime.now();
         }
-    };
+        return Math.max(MINIMUM_RATE_LIMIT_RETRY_MILLIS, (Long.parseLong(v) - now.toInstant().getEpochSecond()) * 1000);
+    }
 
     /**
      * Fail immediately.

src/test/java/org/kohsuke/github/RateLimitHandlerTest.java

@@ -1,6 +1,7 @@
 package org.kohsuke.github;
 
 import com.github.tomakehurst.wiremock.core.WireMockConfiguration;
+import org.jetbrains.annotations.NotNull;
 import org.junit.Test;
 import org.kohsuke.github.connector.GitHubConnectorResponse;
 
@@ -117,16 +118,56 @@ public void testHandler_HttpStatus_Fail() throws Exception {
     /**
      * Test handler wait.
      *
-     * @throws Exception
+     * @throws IOException
      *             the exception
      */
     @Test
-    public void testHandler_Wait() throws Exception {
+    public void testHandler_Wait() throws IOException {
+        // Customized response that templates the date to keep things working
+        snapshotNotAllowed();
+
+        gitHub = getGitHubBuilder().withEndpoint(mockGitHub.apiServer().baseUrl())
+                .withRateLimitHandler(new GitHubRateLimitHandler() {
+
+                    @Override
+                    public void onError(@NotNull GitHubConnectorResponse connectorResponse) throws IOException {
+                        long waitTime = GitHubRateLimitHandler.WAIT.parseWaitTime(connectorResponse);
+                        assertThat(waitTime, equalTo(3 * 1000l));
+
+                        GitHubAbuseLimitHandler.WAIT.onError(connectorResponse);
+                    }
+                })
+                .build();
+
+        gitHub.getMyself();
+        assertThat(mockGitHub.getRequestCount(), equalTo(1));
+
+        getTempRepository();
+        assertThat(mockGitHub.getRequestCount(), equalTo(3));
+    }
+
+    /**
+     * Test the wait logic in the case where the "Date" header field is missing from the response.
+     *
+     * @throws IOException
+     *             if the code under test throws that exception
+     */
+    @Test
+    public void testHandler_Wait_Missing_Date_Header() throws IOException {
         // Customized response that templates the date to keep things working
         snapshotNotAllowed();
 
         gitHub = getGitHubBuilder().withEndpoint(mockGitHub.apiServer().baseUrl())
-                .withRateLimitHandler(GitHubRateLimitHandler.WAIT)
+                .withRateLimitHandler(new GitHubRateLimitHandler() {
+
+                    @Override
+                    public void onError(@NotNull GitHubConnectorResponse connectorResponse) throws IOException {
+                        long waitTime = GitHubRateLimitHandler.WAIT.parseWaitTime(connectorResponse);
+                        assertThat(waitTime, equalTo(3 * 1000l));
+
+                        GitHubAbuseLimitHandler.WAIT.onError(connectorResponse);
+                    }
+                })
                 .build();
 
         gitHub.getMyself();

src/test/resources/org/kohsuke/github/RateLimitHandlerTest/wiremock/testHandler_Wait/mappings/2-r_h_t_Wait.json

@@ -20,7 +20,7 @@
       "Status": "403 Forbidden",
       "X-RateLimit-Limit": "5000",
       "X-RateLimit-Remaining": "0",
-      "X-RateLimit-Reset": "{{testStartDate offset='3 seconds' format='unix'}}",
+      "X-RateLimit-Reset": "{{now offset='3 seconds' format='unix'}}",
       "Cache-Control": "private, max-age=60, s-maxage=60",
       "Vary": [
         "Accept, Authorization, Cookie, X-GitHub-OTP",

src/test/resources/org/kohsuke/github/RateLimitHandlerTest/wiremock/testHandler_Wait_Missing_Date_Header/__files/1-user.json

@@ -0,0 +1,45 @@
+{
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+  "id": 1958953,
+  "node_id": "MDQ6VXNlcjE5NTg5NTM=",
+  "avatar_url": "https://avatars3.githubusercontent.com/u/1958953?v=4",
+  "gravatar_id": "",
+  "url": "https://api.github.com/users/bitwiseman",
+  "html_url": "https://github.com/bitwiseman",
+  "followers_url": "https://api.github.com/users/bitwiseman/followers",
+  "following_url": "https://api.github.com/users/bitwiseman/following{/other_user}",
+  "gists_url": "https://api.github.com/users/bitwiseman/gists{/gist_id}",
+  "starred_url": "https://api.github.com/users/bitwiseman/starred{/owner}{/repo}",
+  "subscriptions_url": "https://api.github.com/users/bitwiseman/subscriptions",
+  "organizations_url": "https://api.github.com/users/bitwiseman/orgs",
+  "repos_url": "https://api.github.com/users/bitwiseman/repos",
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+  "received_events_url": "https://api.github.com/users/bitwiseman/received_events",
+  "type": "User",
+  "site_admin": false,
+  "name": "Liam Newman",
+  "company": "Cloudbees, Inc.",
+  "blog": "",
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+  "owned_private_repos": 0,
+  "disk_usage": 33697,
+  "collaborators": 0,
+  "two_factor_authentication": true,
+  "plan": {
+    "name": "free",
+    "space": 976562499,
+    "collaborators": 0,
+    "private_repos": 10000
+  }
+}

src/test/resources/org/kohsuke/github/RateLimitHandlerTest/wiremock/testHandler_Wait_Missing_Date_Header/__files/3-r_h_t_Wait.json

@@ -0,0 +1,126 @@
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+    "site_admin": false
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src/test/resources/org/kohsuke/github/RateLimitHandlerTest/wiremock/testHandler_Wait_Missing_Date_Header/mappings/1-user.json

@@ -0,0 +1,48 @@
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+  "name": "user",
+  "request": {
+    "url": "/user",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "1-user.json",
+    "headers": {
+      "Date": "Thu, 06 Feb 2020 18:33:32 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "github.com",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4930",
+      "X-RateLimit-Reset": "{{now offset='3 seconds' format='unix'}}",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
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+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding"
+      ],
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+      "Last-Modified": "Thu, 06 Feb 2020 17:29:39 GMT",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
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+      "X-Content-Type-Options": "nosniff",
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+    }
+  },
+  "uuid": "a60baf84-5b5c-4f86-af3d-cab0d609c7b2",
+  "persistent": true,
+  "insertionIndex": 1
+}