| 1 | package bot |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "errors" |
| 6 | "net/http" |
| 7 | "net/http/httptest" |
| 8 | "sync" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | // The client retries transient failures (a dropped connection or a 5xx) and |
| 13 | // succeeds once the API responds — so a single "unexpected EOF" on the long |
| 14 | // build call no longer fails the whole build. |
| 15 | func TestAnthropicRetriesTransient(t *testing.T) { |
| 16 | var mu sync.Mutex |
| 17 | n := 0 |
| 18 | srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 19 | mu.Lock() |
| 20 | n++ |
| 21 | attempt := n |
| 22 | mu.Unlock() |
| 23 | switch attempt { |
| 24 | case 1: |
| 25 | // Drop the connection mid-response → the client sees a transport |
| 26 | // error (like unexpected EOF). |
| 27 | hj, ok := w.(http.Hijacker) |
| 28 | if !ok { |
| 29 | t.Fatal("no hijacker") |
| 30 | } |
| 31 | conn, _, _ := hj.Hijack() |
| 32 | conn.Close() |
| 33 | case 2: |
| 34 | w.WriteHeader(http.StatusServiceUnavailable) |
| 35 | w.Write([]byte("overloaded")) |
| 36 | default: |
| 37 | w.Write([]byte(`{"content":[{"type":"text","text":"ok"}],"stop_reason":"end_turn"}`)) |
| 38 | } |
| 39 | })) |
| 40 | defer srv.Close() |
| 41 | |
| 42 | c := &anthropicClient{key: "k", base: srv.URL, http: srv.Client()} |
| 43 | resp, err := c.create(anthRequest{Model: "m", MaxTokens: 10, Messages: []anthMessage{{Role: "user", Content: "hi"}}}) |
| 44 | if err != nil { |
| 45 | t.Fatalf("create should have retried to success: %v", err) |
| 46 | } |
| 47 | if resp.text() != "ok" { |
| 48 | t.Fatalf("bad reply: %q", resp.text()) |
| 49 | } |
| 50 | if n != 3 { |
| 51 | t.Fatalf("expected 3 attempts (drop, 503, ok), got %d", n) |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | // createStream assembles the response from SSE deltas — text and tool_use |
| 56 | // accumulate across content blocks, and a request that ends with message_stop |
| 57 | // succeeds. |
| 58 | func TestAnthropicStreamAssembles(t *testing.T) { |
| 59 | stream := "event: message_start\n" + |
| 60 | `data: {"type":"message_start"}` + "\n\n" + |
| 61 | "event: content_block_start\n" + |
| 62 | `data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}` + "\n\n" + |
| 63 | "event: content_block_delta\n" + |
| 64 | `data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello "}}` + "\n\n" + |
| 65 | "event: content_block_delta\n" + |
| 66 | `data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"world"}}` + "\n\n" + |
| 67 | "event: content_block_stop\n" + |
| 68 | `data: {"type":"content_block_stop","index":0}` + "\n\n" + |
| 69 | "event: content_block_start\n" + |
| 70 | `data: {"type":"content_block_start","index":1,"content_block":{"type":"tool_use","id":"t1","name":"do_it","input":{}}}` + "\n\n" + |
| 71 | "event: content_block_delta\n" + |
| 72 | `data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"{\"x\":"}}` + "\n\n" + |
| 73 | "event: content_block_delta\n" + |
| 74 | `data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"1}"}}` + "\n\n" + |
| 75 | "event: message_delta\n" + |
| 76 | `data: {"type":"message_delta","delta":{"stop_reason":"tool_use"}}` + "\n\n" + |
| 77 | "event: message_stop\n" + |
| 78 | `data: {"type":"message_stop"}` + "\n\n" |
| 79 | |
| 80 | var gotStream bool |
| 81 | srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 82 | var body struct { |
| 83 | Stream bool `json:"stream"` |
| 84 | } |
| 85 | json.NewDecoder(r.Body).Decode(&body) |
| 86 | gotStream = body.Stream |
| 87 | w.Header().Set("Content-Type", "text/event-stream") |
| 88 | w.Write([]byte(stream)) |
| 89 | })) |
| 90 | defer srv.Close() |
| 91 | |
| 92 | c := &anthropicClient{key: "k", base: srv.URL, http: srv.Client()} |
| 93 | resp, err := c.createStream(anthRequest{Model: "m", MaxTokens: 10, Messages: []anthMessage{{Role: "user", Content: "hi"}}}) |
| 94 | if err != nil { |
| 95 | t.Fatalf("createStream: %v", err) |
| 96 | } |
| 97 | if !gotStream { |
| 98 | t.Fatal("request did not set stream:true") |
| 99 | } |
| 100 | if resp.text() != "Hello world" { |
| 101 | t.Fatalf("text not assembled: %q", resp.text()) |
| 102 | } |
| 103 | if resp.StopReason != "tool_use" { |
| 104 | t.Fatalf("stop reason: %q", resp.StopReason) |
| 105 | } |
| 106 | if len(resp.Content) != 2 || resp.Content[1].Type != "tool_use" || resp.Content[1].Name != "do_it" { |
| 107 | t.Fatalf("tool_use block missing: %+v", resp.Content) |
| 108 | } |
| 109 | if v, _ := resp.Content[1].Input["x"].(float64); v != 1 { |
| 110 | t.Fatalf("tool_use input not assembled: %+v", resp.Content[1].Input) |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | // A stream cut before message_stop is transient: the client retries and succeeds |
| 115 | // on the next attempt — the streaming twin of the EOF-retry behaviour. |
| 116 | func TestAnthropicStreamRetriesCutStream(t *testing.T) { |
| 117 | full := "event: content_block_start\n" + |
| 118 | `data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}` + "\n\n" + |
| 119 | "event: content_block_delta\n" + |
| 120 | `data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"ok"}}` + "\n\n" + |
| 121 | "event: message_stop\n" + |
| 122 | `data: {"type":"message_stop"}` + "\n\n" |
| 123 | var mu sync.Mutex |
| 124 | n := 0 |
| 125 | srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 126 | mu.Lock() |
| 127 | n++ |
| 128 | attempt := n |
| 129 | mu.Unlock() |
| 130 | if attempt == 1 { |
| 131 | // Some deltas, then drop the connection with no message_stop. |
| 132 | hj, _ := w.(http.Hijacker) |
| 133 | conn, buf, _ := hj.Hijack() |
| 134 | buf.WriteString("HTTP/1.1 200 OK\r\nContent-Type: text/event-stream\r\n\r\n") |
| 135 | buf.WriteString("event: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}\n\n") |
| 136 | buf.Flush() |
| 137 | conn.Close() |
| 138 | return |
| 139 | } |
| 140 | w.Header().Set("Content-Type", "text/event-stream") |
| 141 | w.Write([]byte(full)) |
| 142 | })) |
| 143 | defer srv.Close() |
| 144 | |
| 145 | c := &anthropicClient{key: "k", base: srv.URL, http: srv.Client()} |
| 146 | resp, err := c.createStream(anthRequest{Model: "m", MaxTokens: 10, Messages: []anthMessage{{Role: "user", Content: "hi"}}}) |
| 147 | if err != nil { |
| 148 | t.Fatalf("createStream should have retried past the cut: %v", err) |
| 149 | } |
| 150 | if resp.text() != "ok" { |
| 151 | t.Fatalf("bad reply: %q", resp.text()) |
| 152 | } |
| 153 | if n != 2 { |
| 154 | t.Fatalf("expected 2 attempts (cut, ok), got %d", n) |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | // A deterministic 4xx (bad request / auth) is NOT retried — it would just fail |
| 159 | // the same way, so the caller learns immediately. |
| 160 | func TestAnthropicDoesNotRetry4xx(t *testing.T) { |
| 161 | var mu sync.Mutex |
| 162 | n := 0 |
| 163 | srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 164 | mu.Lock() |
| 165 | n++ |
| 166 | mu.Unlock() |
| 167 | w.WriteHeader(http.StatusBadRequest) |
| 168 | w.Write([]byte(`{"error":{"message":"bad"}}`)) |
| 169 | })) |
| 170 | defer srv.Close() |
| 171 | |
| 172 | c := &anthropicClient{key: "k", base: srv.URL, http: srv.Client()} |
| 173 | _, err := c.create(anthRequest{Model: "m", MaxTokens: 10, Messages: []anthMessage{{Role: "user", Content: "hi"}}}) |
| 174 | if err == nil { |
| 175 | t.Fatal("expected an error") |
| 176 | } |
| 177 | var he *anthHTTPError |
| 178 | if !errors.As(err, &he) || he.status != http.StatusBadRequest { |
| 179 | t.Fatalf("expected a 400 anthHTTPError, got %v", err) |
| 180 | } |
| 181 | mu.Lock() |
| 182 | defer mu.Unlock() |
| 183 | if n != 1 { |
| 184 | t.Fatalf("a 4xx must not be retried; got %d attempts", n) |
| 185 | } |
| 186 | } |
| 187 | |
amadan