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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /* | ||
| * | ||
| * Copyright 2016, Google Inc. | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions are | ||
| * met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * * Redistributions in binary form must reproduce the above | ||
| * copyright notice, this list of conditions and the following disclaimer | ||
| * in the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * * Neither the name of Google Inc. nor the names of its | ||
| * contributors may be used to endorse or promote products derived from | ||
| * this software without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| */ | ||
|
|
||
| #include "src/core/support/backoff.h" | ||
|
|
||
| #include <grpc/support/useful.h> | ||
|
|
||
| void gpr_backoff_init(gpr_backoff *backoff, double multiplier, double jitter, | ||
| int64_t min_timeout_millis, int64_t max_timeout_millis) { | ||
| backoff->multiplier = multiplier; | ||
| backoff->jitter = jitter; | ||
| backoff->min_timeout_millis = min_timeout_millis; | ||
| backoff->max_timeout_millis = max_timeout_millis; | ||
| backoff->rng_state = (uint32_t)gpr_now(GPR_CLOCK_REALTIME).tv_nsec; | ||
| } | ||
|
|
||
| gpr_timespec gpr_backoff_begin(gpr_backoff *backoff, gpr_timespec now) { | ||
| backoff->current_timeout_millis = backoff->min_timeout_millis; | ||
| return gpr_time_add( | ||
| now, gpr_time_from_millis(backoff->current_timeout_millis, GPR_TIMESPAN)); | ||
| } | ||
|
|
||
| /* Generate a random number between 0 and 1. */ | ||
| static double generate_uniform_random_number(uint32_t *rng_state) { | ||
| *rng_state = (1103515245 * *rng_state + 12345) % ((uint32_t)1 << 31); | ||
| return *rng_state / (double)((uint32_t)1 << 31); | ||
| } | ||
|
|
||
| gpr_timespec gpr_backoff_step(gpr_backoff *backoff, gpr_timespec now) { | ||
| double new_timeout_millis = | ||
| backoff->multiplier * (double)backoff->current_timeout_millis; | ||
| double jitter_range = backoff->jitter * new_timeout_millis; | ||
| double jitter = | ||
| (2 * generate_uniform_random_number(&backoff->rng_state) - 1) * | ||
| jitter_range; | ||
| backoff->current_timeout_millis = | ||
| GPR_CLAMP((int64_t)(new_timeout_millis + jitter), | ||
| backoff->min_timeout_millis, backoff->max_timeout_millis); | ||
| return gpr_time_add( | ||
| now, gpr_time_from_millis(backoff->current_timeout_millis, GPR_TIMESPAN)); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| /* | ||
| * | ||
| * Copyright 2016, Google Inc. | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions are | ||
| * met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * * Redistributions in binary form must reproduce the above | ||
| * copyright notice, this list of conditions and the following disclaimer | ||
| * in the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * * Neither the name of Google Inc. nor the names of its | ||
| * contributors may be used to endorse or promote products derived from | ||
| * this software without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| */ | ||
|
|
||
| #ifndef GRPC_INTERNAL_CORE_SUPPORT_BACKOFF_H | ||
| #define GRPC_INTERNAL_CORE_SUPPORT_BACKOFF_H | ||
|
|
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| #include <grpc/support/time.h> | ||
|
|
||
| typedef struct { | ||
| /// const: multiplier between retry attempts | ||
| double multiplier; | ||
| /// const: amount to randomize backoffs | ||
| double jitter; | ||
| /// const: minimum time between retries in milliseconds | ||
| int64_t min_timeout_millis; | ||
| /// const: maximum time between retries in milliseconds | ||
| int64_t max_timeout_millis; | ||
|
|
||
| /// random number generator | ||
| uint32_t rng_state; | ||
|
|
||
| /// current retry timeout in milliseconds | ||
| int64_t current_timeout_millis; | ||
| } gpr_backoff; | ||
|
|
||
| /// Initialize backoff machinery - does not need to be destroyed | ||
| void gpr_backoff_init(gpr_backoff *backoff, double multiplier, double jitter, | ||
| int64_t min_timeout_millis, int64_t max_timeout_millis); | ||
|
|
||
| /// Begin retry loop: returns a timespec for the NEXT retry | ||
| gpr_timespec gpr_backoff_begin(gpr_backoff *backoff, gpr_timespec now); | ||
| /// Step a retry loop: returns a timespec for the NEXT retry | ||
| gpr_timespec gpr_backoff_step(gpr_backoff *backoff, gpr_timespec now); | ||
|
|
||
| #endif // GRPC_INTERNAL_CORE_SUPPORT_BACKOFF_H |
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